Amorphous Tin‐Based Composite Oxide: A High‐Rate and Ultralong‐Life Sodium‐Ion‐Storage Material |
| |
| Authors: | Xu Yang Rong‐Yu Zhang Jing Zhao Zhi‐Xuan Wei Dong‐Xue Wang Xiao‐Fei Bie Yu Gao Jia Wang Fei Du Gang Chen |
| |
| Affiliation: | 1. Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, China;2. College of New Energy, Bohai University, Jinzhou, China;3. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, China |
| |
| Abstract: | 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. |
| |
| Keywords: | amorphous anode pseudocapacitance sodium ion batteries tin‐based |
|
|
