Improved Cycling Stability of Li[Ni0.90Co0.05Mn0.05]O2 Through Microstructure Modification by Boron Doping for Li‐Ion Batteries |
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| Authors: | Kang‐Joon Park Hun‐Gi Jung Liang‐Yin Kuo Payam Kaghazchi Chong S Yoon Yang‐Kook Sun |
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| Institution: | 1. Department of Energy Engineering, Hanyang University, Seoul, South Korea;2. Center for Energy Convergence Research, Green City Technology Institute, Korea Institute of Science and Technology, Seoul, South Korea;3. Physiklische und Theoretische Chemie, Freie Universitat, Berlin, Germany;4. Department of Materials Science and Engineering, Hanyang University, Seoul, South Korea |
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| Abstract: | Boron‐doped LiNi0.90Co0.05Mn0.05]O2 cathodes are synthesized by adding B2O3 during the lithiation of the hydroxide precursor. Density functional theory confirms that boron doping at a level as low as 1 mol% alters the surface energies to produce a highly textured microstructure that can partially relieve the intrinsic internal strain generated during the deep charging of LiNi0.90Co0.05Mn0.05]O2. The 1 mol% B‐LiNi0.90Co0.05Mn0.05]O2 cathode thus delivers a discharge capacity of 237 mAh g?1 at 4.3 V, with an outstanding capacity retention of 91% after 100 cycles at 55 °C, which is 15% higher than that of the undoped LiNi0.90Co0.05Mn0.05]O2 cathode. This proposed synthesis strategy demonstrates that an optimal microstructure exists for extending the cycle life of Ni‐rich LiNi1‐x‐yCoxMny]O2 cathodes that have an inadequate cycling stability in electric vehicle applications and indicates that an optimal microstructure can be achieved through surface energy modification. |
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| Keywords: | boron Li‐ion batteries Ni‐rich NCM cathodes surface energy |
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