共查询到20条相似文献,搜索用时 187 毫秒
1.
Jiafeng Ruan Fangjie Mo Ziliang Chen Miao Liu Shiyou Zheng Renbing Wu Fang Fang Yun Song Dalin Sun 《Liver Transplantation》2020,10(15)
Potassium‐ion hybrid capacitors (PIHCs), elaborately integrate the advantages of high output power as well as long lifespan of supercapacitors and the high energy density of batteries, and exhibit great possibilities for the future generations of energy storage devices. The critical next step for future implementation lies in exploring a high‐rate battery‐type anode with an ultra‐stable structure to match the capacitor‐type cathode. Herein, a “dual‐carbon” is constructed, in which a three‐dimensional nitrogen‐doped microporous carbon polyhedron (NMCP) derived from metal‐organic frameworks is tightly wrapped by two‐dimensional reduced graphene oxide (NMCP@rGO). Benefiting from the synergistic effect of the inner NMCP and outer rGO, the NMCP@rGO exhibits a superior K‐ion storage capability with a high reversible capacity of 386 mAh g?1 at 0.05 A g?1 and ultra‐long cycle stability with a capacity of 151.4 mAh g?1 after 6000 cycles at 5.0 A g?1. As expected, the as‐assembled PIHCs with a working voltage as high as 4.2 V present a high energy/power density (63.6 Wh kg?1 at 19 091 W kg?1) and excellent capacity retention of 84.7% after 12 000 cycles. This rational construction of advanced PIHCs with excellent performance opens a new avenue for further application and development. 相似文献
2.
Aamir Razaq Leif Nyholm Martin Sjödin Maria Strømme Albert Mihranyan 《Liver Transplantation》2012,2(4):445-454
Composites of polypyrrole (PPy) and Cladophora nanocellulose, reinforced with 8 μm‐thick chopped carbon filaments, can be used as electrode materials to obtain paper‐based energy‐storage devices with unprecedented performance at high charge and discharge rates. Charge capacities of more than 200 C g?1 (PPy) are obtained for paper‐based electrodes at potential scan rates as high as 500 mV s?1, whereas cell capacitances of ~60–70 F g?1 (PPy) are reached for symmetric supercapacitor cells with capacitances up to 3.0 F (i.e.,0.48 F cm?2) when charged to 0.6 V using current densities as high as 31 A g?1 based on the PPy weight (i.e., 99 mA cm?2). Energy and power densities of 1.75 Wh kg?1 and 2.7 kW kg?1, respectively, are obtained when normalized with respect to twice the PPy weight of the smaller electrode. No loss in cell capacitance is seen during charging/discharging at 7.7 A g?1 (PPy) over 1500 cycles. It is proposed that the nonelectroactive carbon filaments decrease the contact resistances and the resistance of the reduced PPy composite. The present straightforward approach represents significant progress in the development of low‐cost and environmentally friendly paper‐based energy‐storage devices for high‐power applications. 相似文献
3.
Na Rae Kim Sang Moon Lee Min Wook Kim Hyeon Ji Yoon Won G. Hong Hae Jin Kim Hyoung Jin Choi Hyoung‐Joon Jin Young Soo Yun 《Liver Transplantation》2017,7(19)
In this study, hierarchically nanoporous pyropolymers (HN‐PPs) including numerous redox‐active heteroatoms are fabricated from polyaniline nanotubes by heating with KOH. In the large operating voltage range 1.0–4.8 V versus Li+/Li, HN‐PPs store amphicharges by a pseudocapacitive manner of Li‐ion (mainly <3.0 V) and electrochemical double layer formation of anion (primarily >3.0 V). Through these surface‐driven charge storage behaviors, HN‐PPs achieve a significantly high specific capacity of ≈460 mA h g?1 at 0.5 A g?1, maintaining specific capacities of 140 mA h g?1 at a high specific current of 30 A g?1 and 305 mA h g?1 after 2000 cycles at 3 A g?1. Furthermore, asymmetric energy storage devices based on HN‐PPs deliver a high specific energy of 265 W h kg?1 and high specific power of 5081 W kg?1 with long‐term cycling performance. 相似文献
4.
Xiang Hu Yangjie Liu Junxiang Chen Luocai Yi Hongbing Zhan Zhenhai Wen 《Liver Transplantation》2019,9(42)
Potassium‐ion hybrid capacitors (PIHCs) hold the advantages of high‐energy density of batteries and high‐power output of supercapacitors and thus present great promise for the next generation of electrochemical energy storage devices. One of the most crucial tasks for developing a high‐performance PIHCs is to explore a favorable anode material with capability to balance the kinetics mismatch between battery‐type anodes and capacitor‐type cathode. Herein, a reliable route for fabricating sulfur and nitrogen codoped 3D porous carbon nanosheets (S‐N‐PCNs) is reported. Systematic characterizations coupled with kinetics analysis indicate that the doped heteroatoms of sulfur and nitrogen and the amplified graphite interlayer can provide ample structural defects and redox active sites that are beneficial for improving pseudocapacitive activity, enabling fast kinetics toward efficient potassium‐ion storage. The S‐N‐PCNs are demonstrated to exhibit superior potassium storage capability with a high capacity of 107 mAh g?1 at 20 A g?1 and long cycle stability. The as‐developed PIHCs present impressive electrochemical performance with an operating voltage as high as 4.0 V, an energy density of 187 Wh kg?1, a power density of 5136 W kg?1, and a capacity retention of 86.4% after 3000 cycles. 相似文献
5.
Phase Transformation Induced Capacitance Activation for 3D Graphene‐CoO Nanorod Pseudocapacitor 下载免费PDF全文
Yun Guang Zhu Ye Wang Yumeng Shi Zhi Xiang Huang Lin Fu Hui Ying Yang 《Liver Transplantation》2014,4(9)
Development of a pseudocapacitor over the integration of metal oxide on carbonaceous materials is a promising step towards energy storage devices with high energy and power densities. Here, a self‐assembled cobalt oxide (CoO) nanorod cluster on three‐dimensional graphene (CoO‐3DG) is synthesized through a facile hydrothermal method followed by heat treatment. As an additive‐free electrode, CoO‐3DG exhibits good electrochemical performance. Compared with CoO nanorod clusters grown on Ni foam (i.e., CoO‐Ni, ≈680 F g?1 at 1 A g?1 and ≈400 F g?1 at 20 A g?1), CoO‐3DG achieves much higher capacitance (i.e., ≈980 F g?1 at 1 A g?1 and ≈600 F g?1 at 20 A g?1) with excellent cycling stability of 103% retention of specific capacitance after 10 000 cycles. Furthermore, it shows an interesting activation process and instability with a redox reaction for CoO. In addition, the phase transformation from CoO nanorods to Co3O4 nanostructures was observed and investigated after charge and discharge process, which suggests the activation kinetics and the phase transformable nature of CoO based nanostructure. These observations demonstrate phase transformation with morphological change induced capacitance increasement in the emergent class of metal oxide materials for electrochemical energy storage device. 相似文献
6.
In this work, an integrated dual‐ion battery design is reported with active materials, current collectors, and separator, assembled in one flexible component. An aluminum film is deposited directly onto one side of the 3D porous glass fiber separator to form a porous anode. Cathode active materials are loaded on the other side of the separator with aluminum film deposited on the top as current collector. This design demonstrates ultrafast charge/discharge rate up to 120 C while maintaining high capacity of 116.1 mA h g?1. Moreover, long‐term stability of over 1500 cycles at a high rate of 60 C is achieved. The estimated energy density remains as high as 232.6 W h kg?1 at an ultrahigh power density of 22634.5 W kg?1. 相似文献
7.
John B. Cook Hyung‐Seok Kim Terri C. Lin Chun‐Han Lai Bruce Dunn Sarah H. Tolbert 《Liver Transplantation》2017,7(2)
A synthesis methodology is demonstrated to produce MoS2 nanoparticles with an expanded atomic lamellar structure that are ideal for Faradaic‐based capacitive charge storage. While much of the work on MoS2 focuses on the high capacity conversion reaction, that process is prone to poor reversibility. The pseudocapacitive intercalation‐based charge storage reaction of MoS2 is investigated, which is extremely fast and highly reversible. A major challenge in the field of pseudocapacitive‐based energy storage is the development of thick electrodes from nanostructured materials that can sustain the fast inherent kinetics of the active nanocrystalline material. Here a composite electrode comprised of a poly(acrylic acid) binder, carbon fibers, and carbon black additives is utilized. These electrodes deliver a specific capacity of 90 mAh g?1 in less than 20 s and can be cycled 3000 times while retaining over 80% of the original capacity. Quantitative kinetic analysis indicates that over 80% of the charge storage in these MoS2 nanocrystals is pseudocapacitive. Asymmetric full cell devices utilizing a MoS2 nanocrystal‐based electrode and an activated carbon electrode achieve a maximum power density of 5.3 kW kg?1 (with 6 Wh kg?1 energy density) and a maximum energy density of 37 Wh kg?1 (with 74 W kg?1power density). 相似文献
8.
Exploiting High‐Performance Anode through Tuning the Character of Chemical Bonds for Li‐Ion Batteries and Capacitors 下载免费PDF全文
A high‐performance anode material, MnNCN, is synthesized through a facile and low‐cost method. The relationship between electrochemical properties and chemical composition is explored on the scientific considerations that can provide an insight on designing expected materials. MnNCN with the long bonding length of 2.262 Å in Mn? N and weak electronegativity of 3.04 Pauling units in N leads to a lower charge/discharge potential than that of MnO owing to the character of chemical bonds transformed to covalent dominating from ionic dominating in MnO. Covalent character increases the ratio of sharing electrons that decreases the migration energy of electrons in electrochemical reaction, which enhances the reactive reversibility and stability of electrode material. MnNCN delivered a reversibly specific capacity of 385 mA h g?1 at 5 A g?1 in a Li‐ion half cell. Besides, a Li‐ion hybrid capacitor with a high voltage of 4 V presents energy and power densities of respective 103 Wh kg?1 and 8533 W kg?1 and cycles at 5 A g?1 without detectable degradation after 5000 cycles. 相似文献
9.
《Liver Transplantation》2018,8(11)
Supercapacitors with fast charge/discharge rate and long cycling stability (>50 000 cycles) are attractive for energy storage and mobile power supply. In this paper, a facile strategy is developed to fabricate an Fe2O3/FeS‐decorated N, S‐codoped hierarchical porous carbon hybrid. Its microstructure and compositions can be readily controlled through adjusting the hydrothermal reaction between waxberry and iron sulfate. The constructed supercapacitors with the as‐prepared carbon materials from this reaction are able to exhibit outstanding capacitive performance with a superfast charge/discharge rate (<1 s), ultralong cycle life (>50 000 cycles, 80 A g−1), ultrahigh volumetric capacitance (1320.4 F cm−3, 0.1 A g−1), and high energy density (100.9 W h kg−1, 221.9 W h L−1). The outstanding performance makes it one of the best biomass‐derived supercapacitors. The superior capacitive behavior is likely to arise from the N and S codoping on the surface/edge/skeleton of the carbon microspheres and nanosheet composites coupled with the fast redox reaction of Fe2O3/FeS. Overall, this research presents a new avenue for developing the next generation of sustainable high‐performance energy storage device. 相似文献
10.
Amorphous Tin‐Based Composite Oxide: A High‐Rate and Ultralong‐Life Sodium‐Ion‐Storage Material 下载免费PDF全文
Xu Yang Rong‐Yu Zhang Jing Zhao Zhi‐Xuan Wei Dong‐Xue Wang Xiao‐Fei Bie Yu Gao Jia Wang Fei Du Gang Chen 《Liver Transplantation》2018,8(8)
Energy‐storage technology is moving beyond lithium batteries to sodium as a result of its high abundance and low cost. However, this sensible transition requires the discovery of high‐rate and long‐lifespan anode materials, which remains a significant challenge. Here, the facile synthesis of an amorphous Sn2P2O7/reduced graphene oxide nanocomposite and its sodium storage performance between 0.01 and 3.0 V are reported for the first time. This hybrid electrode delivers a high specific capacity of 480 mA h g?1 at a current density of 50 mA g?1 and superior rate performance of 250 and 165 mA h g?1 at 2 and 10 A g?1, respectively. Strikingly, this anode can sustain 15 000 cycles while retaining over 70% of the initial capacity. Quantitative kinetic analysis reveals that the sodium storage is governed by pseudocapacitance, particularly at high current rates. A full cell with sodium super ionic conductor (NASICON)‐structured Na3V2(PO4)2F3 and Na3V2(PO4)3 as cathodes exhibits a high energy density of over 140 W h kg?1 and a power density of nearly 9000 W kg?1 as well as stability over 1000 cycles. This exceptional performance suggests that the present system is a promising power source for promoting the substantial use of low‐cost energy storage systems. 相似文献
11.
Yao Xiao Peng‐Fei Wang Ya‐Xia Yin Yan‐Fang Zhu Xinan Yang Xu‐Dong Zhang Yuesheng Wang Xiao‐Dong Guo Ben‐He Zhong Yu‐Guo Guo 《Liver Transplantation》2018,8(22)
Delivery of high‐energy density with long cycle life is facing a severe challenge in developing cathode materials for rechargeable sodium‐ion batteries (SIBs). Here a composite Na0.6MnO2 with layered–tunnel structure combining intergrowth morphology of nanoplates and nanorods for SIBs, which is clearly confirmed by micro scanning electron microscopy, high‐resolution transmission electron microscopy as well as scanning transmission electron microscopy with atomic resolution is presented. Owing to the integrated advantages of P2 layered structure with high capacity and that of the tunnel structure with excellent cycling stability and superior rate performance, the composite electrode delivers a reversible discharge capacity of 198.2 mAh g?1 at 0.2C rate, leading to a high‐energy density of 520.4 Wh kg?1. This intergrowth integration engineering strategy may modulate the physical and chemical properties in oxide cathodes and provide new perspectives on the optimal design of high‐energy density and high‐stable materials for SIBs. 相似文献
12.
Design and Performance of Rechargeable Sodium Ion Batteries,and Symmetrical Li‐Ion Batteries with Supercapacitor‐Like Power Density Based upon Polyoxovanadates 下载免费PDF全文
Jia‐Jia Chen Jian‐Chuan Ye Xia‐Guang Zhang Mark D. Symes Shao‐Cong Fan De‐Liang Long Ming‐Sen Zheng De‐Yin Wu Leroy Cronin Quan‐Feng Dong 《Liver Transplantation》2018,8(6)
The polyanion Li7V15O36(CO3) is a nanosized molecular cluster (≈1 nm in size), that has the potential to form an open host framework with a higher surface‐to‐bulk ratio than conventional transition metal oxide electrode materials. Herein, practical rechargeable Na‐ion batteries and symmetric Li‐ion batteries are demonstrated based on the polyoxovanadate Li7V15O36(CO3). The vanadium centers in {V15O36(CO3)} do not all have the same VIV/V redox potentials, which permits symmetric devices to be created from this material that exhibit battery‐like energy density and supercapacitor‐like power density. An ultrahigh specific power of 51.5 kW kg?1 at 100 A g?1 and a specific energy of 125 W h kg?1 can be achieved, along with a long cycling life (>500 cycles). Moreover, electrochemical and theoretical studies reveal that {V15O36(CO3)} also allows the transport of large cations, like Na+, and that it can serve as the cathode material for rechargeable Na‐ion batteries with a high specific capacity of 240 mA h g?1 and a specific energy of 390 W h kg?1 for the full Na‐ion battery. Finally, the polyoxometalate material from these electrochemical energy storage devices can be easily extracted from spent electrodes by simple treatment with water, providing a potential route to recycling of the redox active material. 相似文献
13.
Shiqiang Wei Changda Wang Shuangming Chen Pengjun Zhang Kefu Zhu Chuanqiang Wu Pin Song Wen Wen Li Song 《Liver Transplantation》2020,10(12)
Transition metal nitrides are promising energy storage materials in regard to good metallic conductivity and high theoretical specific capacity, but their cycling stability is impeded by the huge volume change caused by the conversion reaction mechanism. Here, a simple strategy to produce an intercalation pseudocapacitive‐type vanadium nitride (VN) by one‐step ammonification of V2C MXene for sodium‐ion batteries is reported. Profiting from a distinctive layered structure pillared by Al atoms in the layer spacing, it delivers a high capacity of 372 mA h g?1 at 50 mA g?1 and a desirable rate performance. More importantly, it shows remarkably long cycling stability over 7500 cycles without capacity attenuation at 500 mA g?1. As expected, it is found that the intercalation pseudocapacitance plays an important role in the excellent performance, by using in situ X‐ray diffraction and ex situ X‐ray absorption structure characterization. Even more remarkable, are the high energy and power density of the sodium‐ion capacitor after coupling with a carbon‐based cathode. The hybrid device possesses an energy density of 78.43 Wh kg?1 at power density of 260 W kg?1. The results clearly show that such a unique‐layered VN with outstanding Na storage capability is an excellent new material for energy storage systems. 相似文献
14.
Satoshi Kajiyama Lucie Szabova Hiroki Iinuma Akira Sugahara Kazuma Gotoh Keitaro Sodeyama Yoshitaka Tateyama Masashi Okubo Atsuo Yamada 《Liver Transplantation》2017,7(9)
Pseudocapacitance is a key charge storage mechanism to advanced electrochemical energy storage devices distinguished by the simultaneous achievement of high capacitance and a high charge/discharge rate by using surface redox chemistries. MXene, a family of layered compounds, is a pseudocapacitor‐like electrode material which exhibits charge storage through exceptionally fast ion accessibility to redox sites. Here, the authors demonstrate steric chloride termination in MXene Ti2CTx (Tx : surface termination groups) to open the interlayer space between the individual 2D Ti2CTx units. The open interlayer space significantly enhances Li‐ion accessibility, leading to high gravimetric and volumetric capacitances (300 F g?1 and 130 F cm?3) with less diffusion limitation. A Li‐ion hybrid capacitor consisting of the Ti2CTx negative electrode and the LiNi1/3Co1/3Mn1/3O2 positive electrode displays an unprecedented specific energy density of 160 W h kg?1 at 220 W kg?1 based on the total weight of positive and negative active materials. 相似文献
15.
Guoping Xiong Chuizhou Meng Ronald G. Reifenberger Pedro P. Irazoqui Timothy S. Fisher 《Liver Transplantation》2014,4(3)
The charge storage characteristics of a composite nanoarchitecture with a highly functional 3D morphology are reported. The electrodes are formed by the electropolymerization of aniline monomers into a nanometer‐thick polyaniline (PANI) film that conformally coats graphitic petals (GPs) grown by microwave plasma chemical vapor deposition (MPCVD) on conductive carbon cloth (CC). The hybrid CC/GPs/PANI electrodes yield results near the theoretical maximum capacitance for PANI of 2000 F g?1 (based on PANI mass) and a large area‐normalized specific capacitance of ≈2.6 F cm?2 (equivalent to a volumetric capacitance of ≈230 F cm?3) at a low current density of 1 A g?1 (based on PANI mass). The specific capacitances remain above 1200 F g?1 (based on PANI mass) for currents up to 100 A g?1 with correspondingly high area‐normalized values. The hybrid electrodes also exhibit a high rate capability with an energy density of 110 Wh kg?1 and a maximum power density of 265 kW kg?1 at a current density of 100 A g?1. Long‐term cyclic stability is good (≈7% loss of initial capacitance after 2000 cycles), with coulombic efficiencies >99%. Moreover, prototype all‐solid‐state flexible supercapacitors fabricated from these hybrid electrodes exhibit excellent energy storage performance. 相似文献
16.
Jin Zhao Yi‐Zhou Zhang Jianyu Chen Wenli Zhang Du Yuan Rodney Chua Husam N. Alshareef Yanwen Ma 《Liver Transplantation》2020,10(18)
The pursuit of more efficient carbon‐based anodes for sodium‐ion batteries (SIBs) prepared from facile and economical methods is a very important endeavor. Based on the crystallinity difference within carbon materials, herein, a low‐temperature selective burning method is developed for preparing oxygen and nitrogen codoped holey graphene aerogel as additive‐free anode for SIBs. By selective burning of a mixture of graphene and low‐crystallinity carbon at 450 °C in air, an elastic porous graphene monolith with abundant holes on graphene sheets and optimized crystallinity is obtained. These structural characteristics lead to an additive‐free electrode with fast charge (ions and electrons) transfer and more abundant Na+ storage active sites. Moreover, the heteroatom oxygen/nitrogen doping favors large interlayer distance for rapid Na+ insertion/extraction and provides more active sites for high capacitive contribution. The optimized sample exhibits superior sodium‐ion storage capability, i.e., high specific capacity (446 mAh g?1 at 0.1 A g?1), ultrahigh rate capability (189 mAh g?1 at 10 A g?1), and long cycle life (81.0% capacity retention after 2000 cycles at 5 A g?1). This facile and economic strategy might be extended to fabricating other superior carbon‐based energy storage materials. 相似文献
17.
Zhenghui Pan Jun Zhong Qichong Zhang Jie Yang Yongcai Qiu Xiaoyu Ding Kaiqi Nie Hua Yuan Kun Feng Xianshu Wang Guoguang Xu Wanfei Li Yagang Yao Qinwen Li Meinan Liu Yuegang Zhang 《Liver Transplantation》2018,8(14)
Fiber‐supercapacitors (FSCs) are promising energy storage devices that can complement or even replace microbatteries in miniaturized portable and wearable electronics. Currently, a major challenge for FSCs is achieving ultrahigh volumetric energy and power densities simultaneously, especially when the charge/discharge rates exceed 1 V s?1. Herein, an Au‐nanoparticle‐doped‐MnOx@CoNi‐alloy@carbon‐nanotube (Au–MnOx@CoNi@CNT) core/shell nanocomposite fiber electrode is designed, aiming to boost its charge/discharge rate by taking advantage of the superconductive CoNi alloy network and the greatly enhanced conductivity of the Au doped MnOx active materials. An all‐solid‐state coaxial asymmetric FSC (CAFSC) prototype device made by wrapping this fiber with a holey graphene paper (HGP) exhibits excellent performance at rates up to 10 V s?1, which is the highest charge rate demonstrated so far for FSCs based on pseudocapacitive materials. Furthermore, our fully packaged CAFSC delivers a volumetric energy density of ≈15.1 mW h cm?3, while simultaneously maintaining a high power density of 7.28 W cm?3 as well as a long cycle life (90% retention after 10 000 cycles). This value is the highest among all reported FSCs, even better than that of a typical 4 V/500 µA h thin‐film lithium battery. 相似文献
18.
Magnesium (Mg) batteries are the most promising “post‐lithium‐ion” energy storage technologies owing to their high theoretical energy density, low cost, and intrinsic safety with air and moisture. However, the development of Mg batteries has been limited to cathode materials leading to low power, low reversible energy density, and poor cycle life. Here, a new Mg cathode is reported based on ethyl viologen (EV), which not only has a fast redox couple EV2+/EV0 but also is capable of coupling with redox‐active anions, such as iodide (I?), achieving a total four‐electron storage. The EV2+/EV0 redox couple demonstrates a superior rate performance (10 C) and stable cycle life (500 cycles) owing to intrinsic fast electrode kinetics. A high material utilization (>80%) can be achieved at 1.0 C under a high areal loading of 5 mg cm?2. When coupling with iodide I?, a reversible four‐electron storage is achieved with a high energy density (304.2 Wh kg?1) and a stable cycle life (>100 cycles). This study provides effective strategies for designing reversible multielectron storage for high‐rate and high‐energy rechargeable Mg batteries. 相似文献
19.
Xiaowen Zhan Mark E. Bowden Xiaochuan Lu Jeffery F. Bonnett Teresa Lemmon David M. Reed Vincent L. Sprenkle Guosheng Li 《Liver Transplantation》2020,10(10)
Na‐based batteries have long been regarded as an inexpensive, sustainable candidate for large‐scale stationary energy storage applications. Unfortunately, the market penetration of conventional Na‐NiCl2 batteries is approaching its limit for several reasons, including limited rate capability and high Ni cost. Herein, a Na‐FeCl2 battery operating at 190 °C is reported that allows a capacity output of 116 mAh g?1 at an extremely high current density of 33.3 mA cm?2 (≈0.6C). The superior rate performance is rooted in the intrinsically fast kinetics of the Fe/Fe2+ redox reaction. Furthermore, it is demonstrated that a small amount of Ni additive (10 mol%) effectively mitigates capacity fading of the Fe/NaCl cathode caused by Fe particle pulverization during long‐term cycling. The modified Fe/Ni cathode exhibits excellent cycling stability, maintaining a discharge energy density of over 295 Wh kg?1 for 200 cycles at 10 mA cm?2 (≈C/5). 相似文献
20.
Ji Ung Choi Jae Hyeon Jo Yun Ji Park Kug‐Seung Lee Seung‐Taek Myung 《Liver Transplantation》2020,10(27)
Herein, P′2‐type Na0.67[Ni0.1Fe0.1Mn0.8]O2 is introduced as a promising new cathode material for sodium‐ion batteries (SIBs) that exhibits remarkable structural stability during repetitive Na+ de/intercalation. The O? Ni? O? Mn? O? Fe? O bond in the octahedra of transition‐metal layers is used to suppress the elongation of the Mn? O bond and to improve the electrochemical activity, leading to the highly reversible Na storage mechanism. A high discharge capacity of ≈220 mAh g?1 (≈605 Wh kg?1) is delivered at 0.05 C (13 mAg?1) with a high reversible capacity of ≈140 mAh g?1 at 3 C and excellent capacity retention of 80% over 200 cycles. This performance is associated with the reversible P′2–OP4 phase transition and small volume change upon charge and discharge (≈3%). The nature of the sodium storage mechanism in a full cell paired with a hard carbon anode reveals an unexpectedly high energy density of ≈542 Wh kg?1 at 0.2 C and good capacity retention of ≈81% for 500 cycles at 1 C (260 mAg?1). 相似文献