Li4SiO4-coated LiNi0.5Mn1.5O4 as the high performance cathode materials for lithium-ion batteries

2017年第11卷第3期

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《能源前沿（英文）》 >> 2017年第11卷第3期 doi: 10.1007/s11708-017-0494-2

Li₄SiO₄-coated LiNi_0.5Mn_1.5O₄ as the high performance cathode materials for lithium-ion batteries

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. Advanced Rechargeable Battery Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023; University of Chinese Academy of Sciences, Beijing 100049, China.. Advanced Rechargeable Battery Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China

录用日期： 2017-08-22 发布日期：2017-09-07

摘要

The preparation of Li SiO -coated LiNi Mn O materials by sintering the SiO -coated nickel-manganese oxides with lithium salts using abundant and low-cost sodium silicate as the silicon source was reported. The samples were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. It was found that a uniform and complete SiO coating layer could be obtained at a suitable pH value of 10, which transformed to a good Li SiO coating layer afterwards. When used as the cathode materials for lithium-ion batteries, the Li SiO -coated LiNi Mn O samples deliver a better electrochemical performance in terms of the discharge capacity, rate capability, and cycling stability than that of the pristine material. It can still deliver 111.1 mAh/g at 20 C after 300 cycles, with a retention ratio of 93.1% of the stable capacity, which is far beyond that of the pristine material (101.3 mAh/g, 85.6%).

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lithium-ion batteries ; cathode material ; LiNi_0.5Mn_1.5O₄ ; lithium-ion conductor ; coating

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