Enhanced Structural Stability and Electrochemical Performance of LiNi0.6Co0.2Mn0.2O2 Cathode Materials by Ga Doping |
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| Authors: | Zhibei Liu Jiangang Li Meijie Zhu Li Wang Yuqiong Kang Zhaohan Dang Jiasen Yan Xiangming He |
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| Institution: | 1.Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology, School of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China; (Z.L.); (M.Z.); (Z.D.); (J.Y.);2.Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;3.Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; |
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| Abstract: | Structural instability during cycling is an important factor affecting the electrochemical performance of nickel-rich ternary cathode materials for Li-ion batteries. In this work, enhanced structural stability and electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode materials are achieved by Ga doping. Compared with the pristine electrode, LiNi0.6Co0.2Mn0.2]0.98Ga0.02O2 electrode exhibits remarkably improved electrochemical performance and thermal safety. At 0.5C rate, the discharge capacity increases from 169.3 mAh g−1 to 177 mAh g−1, and the capacity retention also rises from 82.8% to 89.8% after 50 cycles. In the charged state of 4.3 V, its exothermic temperature increases from 245.13 °C to more than 271.24 °C, and the total exothermic heat decreases from 561.7 to 225.6 J·g−1. Both AC impedance spectroscopy and in situ XRD analysis confirmed that Ga doping can improve the stability of the electrode/electrolyte interface structure and bulk structure during cycling, which helps to improve the electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode material. |
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| Keywords: | lithium ion batteries cathode material LiNi0 6Co0 2Mn0 2O2 Ga doping structural stability |
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