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Large-scale synthesis of lithium-and manganese-rich materials with uniform thin-film Al2O3 coating for stable cathode cycling

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Science China Materials 2020年第9期63卷 1683-1692页

作者： Yuqiong Kang Zheng Liang Yun Zhao Haiping Xu Kun Qian Xiangming He Tao Li Jiangang Li School of Chemical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology Beijing 102617China State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China Department of Chemistry and Biochemistry Northern Illinois UniversityDeKalbIL 60115USA Materials Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA

The lithium-and manganese-rich layered oxide(LMR)holds great promise as a cathode material for lithiumion battery(LIB)applications due to its high capacity,high voltage and low ***,its poor initial Coulombic efficiency(ICE)and unstable electrode/electrolyte interface with continuous growth of the solid electrolyte interphase leads to high impedance and large *** effects cause severe capacity loss and safety *** this work,we have developed a novel approach to fabricate a stable LMR cathode with a uniform thin layer of aluminum oxide(Al2O3)coated on the surface of the LMR *** synthesis approach uses the microemulsion method that is environment-friendly,cost-effective and can be easily ***,an 8-nm layer of Al2O3 is shown to be effective in stabilizing the electrode/electrolyte interface(enhanced ICE to82.0%and moderate impedance increase over 200 cycles).Moreover,the phase transformation from layered to spinel is inhibited(96.3%average voltage retention)and thermal stability of the structure is significantly increased(heat release reduced by 72.4%).This study opens up a new avenue to address interface issues in LIB cathodes and prompts the practical applications of high capacity and voltage materials for high energy density batteries.

关键词： lithium ion batteries lithium-and manganese-rich layered oxides surface modification metal oxide thin film uniform coating large-scale synthesis battery safety

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