Nano-Al2O3 Coated Li-rich Cathode Material Li1. 2Ni0.13Co0.13Mn0.54O2 for Highly Improved Lithium-ion Batteries †

doi:10.7503/cjcu20190719

Abstract

Abstract:

The lithium-rich cathode material Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ were coated uniformly by nano-Al₂O₃ for highly stable lithium-ion batteries. The optimum content of nano-Al₂O₃ coating on the structure, surface morphology and electrochemical properties were systematically studied by X-ray diffraction(XRD), scanning electron microscopy(SEM) and transmission electron microscopy(TEM). SEM and TEM results show that the surface of the lithium-rich cathode material is evenly coated with nano-Al₂O₃. XRD results show that the as-synthesized materials have a layered structure. Electrochemical test results show that the nano-Al₂O₃ coating is beneficial to improving the discharge specific capacity, rate performance and cycle stability. The nano-Al₂O₃ coated Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ material has a specific discharge capacity of 249. 7 mA·h/g with excellent cycling stability(89.5% capacity retention after 100 cycles). Cyclic voltammetry(CV) and electrochemical impedance(EIS) results show that nano-Al₂O₃ coating can effectively inhibit the erosion of HF, reduce electrode material/electrolyte interface side-reactions, decrease polarization, reduce interface impedance and charge transfer impedance. This work suggests that the nano-Al₂O₃ coating is an effective route to significantly improve the electrochemical performance of lithium-rich cathode materials.

Key words: Lithium-ion battery, Li_{1. 2}Ni_0.13Co_0.13Mn_0.54O₂, Nanometer aluminum trioxide, Surface modification

CLC Number:

O646

TrendMD:

CHEN Liangdan,ZOU Wei,WU Liang,XIA Fanjie,HU Zhiyi,LI Yu,SU Baolian. Nano-Al₂O₃ Coated Li-rich Cathode Material Li_{1. 2}Ni_0.13Co_0.13Mn_0.54O₂ for Highly Improved Lithium-ion Batteries ^†[J]. Chem. J. Chinese Universities, 2020, 41(6): 1329.

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References 34

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Nano-Al₂O₃ Coated Li-rich Cathode Material Li_{1. 2}Ni_0.13Co_0.13Mn_0.54O₂ for Highly Improved Lithium-ion Batteries ^†

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