期刊
NANO LETTERS
卷 20, 期 8, 页码 5779-5785出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c01640
关键词
Lithium-ion batteries; O2-type Li-0.78[Li0.24Mn0.76]O-2 nanowires; high power density; oxygen redox; voltage stability
类别
资金
- National Key R&D Program of China [2016YFB0100200]
- International Science & Technology Cooperation of China [2019YFE0100200]
- National Natural Science Foundation of China [U1764255, 51671004]
- Beijing Municipal Natural Science Foundation [2181001]
Continued improvement in the electrochemical performance of Li-Mn-O oxide cathode materials is key to achieving advanced low-cost Li-ion batteries with high energy densities. In this study, O2-Type Li-0.(78)[Li0.24Mn0.76]O-2 nanowires were synthesized by a solvothermal reaction to produce P2-type Na-5/6[Li1/4Mn3/4]O-2 nanowires, which were then subjected to molten salt Li-ion exchange. The resulting nanowires have diameters less than 20 nm and lengths of several micrometers. The full-Mn-based nanowires cathode material delivers a reversible capacity of 275 mAh g(-1) at 0.1 C and 200 mAh g(-1) at a high current rate of 15 C with a capacity retention of more than 80% and the voltage decay was dramatically suppressed after 100 cycles. This excellent performance is ascribed to the highly stable oxygen redox reaction and lack of layered-to-spinel phase transition in the O2-type structure during cycling.
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