期刊
ELECTROCHIMICA ACTA
卷 271, 期 -, 页码 276-283出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.01.104
关键词
Lithium-ion battery; Li1.2Mn0.6Ni0.2O2; Freeze-drying; Cathode material
资金
- National Basic Research Program of China (973 Program) [2013CB934001]
- National Natural Science Foundation of China [51575030]
- Natural Science Foundation of Beijing, China [2174075]
The sol-freeze-drying method is successfully applied to tune the structure of Co-free Li-rich Mn-based layered material (Li1.2Mn0.6Ni0.2O2). The structure, morphology and electrochemical performances of the tuned materials are compared with its counterpart prepared by traditional sol-gel method. The results confirm that sol-freeze-drying method is an effective approach to homogenize the transition metal distribution in Li1.2Mn0.6Ni0.2O2 without surface segregation of Ni. The specific capacity of Li1.2Mn0.6Ni0.2O2 synthesized by sol-free-drying method is 232 mAh g(-1) after 100 cycles at 0.2C with 96% of initial discharge capacity retained. It is much higher than the 182 mAh g(-1) of Li1.2Mn0.6Ni0.2O2 prepared by sol-gel method with poor capacity retention of 79%. Li1.2Mn0.6Ni0.2O2 synthesized by sol-free-drying method delivers the capacities of 252, 220, 192, 148, and 84 mAh g(-1) at rates of 0.1C, 0.5C, 1C, 2C, and 5C, respectively. Besides, impedance spectroscopy shows that the charge-transfer resistance of Li1.2Mn0.6Ni0.2O2 synthesized by sol-free-drying method after 20 cycles increases from 43 Omega to 51 Omega, which is much lower than that of Li1.2Mn0.6Ni0.2O2 prepared by sol-gel method from 42 Omega to 78 Omega. (C) 2018 Elsevier Ltd. All rights reserved.
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