High rate cyclability of nickle-doped LiNi0.1Mn1.9O4 cathode materials prepared by a facile molten-salt combustion method for lithium-ion batteries

Journal of Materials Science: Materials in Electronics - Tập 29 - Trang 14668-14678 - 2018
Hongli Bai1,2,3, Wangqiong Xu1,2,3, Junming Guo1,2,3, Chang-wei Su1,2,3, Mingwu Xiang1,2,3, Xiaofang Liu1,2,3, Rui Wang1,2,3
1Key Laboratory of Comprehensive Utilization of Mineral Resources in Ethnic Regions, Yunnan Minzu University, Kunming, People’s Republic of China
2Key Laboratory of Resource Clean Conversion in Ethnic Regions, Education Department of Yunnan, Yunnan Minzu University, Kunming, People’s Republic of China
3Joint Research Centre for International Cross-border Ethnic Regions Biomass Clean Utilization in Yunnan, Yunnan Minzu University, Kunming, People’s Republic of China

Tóm tắt

Here we employed a facile low temperature molten-salt combustion method combined with two-stage calcination process to synthesize a series of Ni-doped spinel LiNi0.1Mn1.9O4 cathode materials. All the LiNi0.1Mn1.9O4 materials present well-defined cubic spinel structure with a representative Fd3m space group. With the elevated calcination temperature, the particle size and crystallinity increase simultaneously. Benefiting from the optimization of calcination temperature, the LiNi0.1Mn1.9O4 prepared at 600 °C reveals a favorable crystal structure and morphology consisted of homogeneous nanoparticles with a size of 90–110 nm. Consequently, the optimized LiNi0.1Mn1.9O4 cathode exhibits high rate capability and ultralong cycling stability with a discharge specific capacity of 97.1 mAh g−1 and a capacity retention of 63.5% after 1000 cycles at a high current rate of 10 and 25 °C. Even at a high-temperature of 55 °C, a high initial discharge capacity of 106.1 mAh g−1 and a good capacity retention of 79.0% is also obtained after 100 cycles at 5 C. Such an excellent electrochemical performance together with the facile synthesis approach may endow the as-prepared LiNi0.1Mn1.9O4 to be a promising practical application for high-power lithium-ion batteries.

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