Li4SiO4-coated LiNi0.5Mn1.5O4 as the high performance cathode materials for lithium-ion batteries
Shifeng YANG1, Wenfeng REN2, Jian CHEN2()
1. Advanced Rechargeable Battery Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023; University of Chinese Academy of Sciences, Beijing 100049, China 2. Advanced Rechargeable Battery Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
The preparation of Li4SiO4-coated LiNi0.5Mn1.5O4 materials by sintering the SiO2-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 SiO2 coating layer could be obtained at a suitable pH value of 10, which transformed to a good Li4SiO4 coating layer afterwards. When used as the cathode materials for lithium-ion batteries, the Li4SiO4-coated LiNi0.5Mn1.5O4 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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