期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 6, 期 6, 页码 7250-7256出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b03989
关键词
Li3V2(PO4)(3); carbon-based composites; long-cycle-life; broad temperature adaptability; lithium-ion batteries
资金
- National Natural Science Foundation of China [51374255, 51302323]
- Innovation-Driven Project of Central South University [2018CX004]
- Fundamental Research Funds for the Central Universities of Central South University
Synthesis of cathode materials with high rates and long cycle life is critical to meet the demands of high power lithium-ion battery applications. Batteries that can work at extreme low temperature conditions are also urgently needed. Herein, we report the rational design and synthesis of a novel lithium vanadium phosphate/carbon (Li3V2(PO4)(3)/C) nanocomposite with a thin-layer amorphous carbon shell (similar to 4 nm) coating and a mesoporous KB carbon matrix. As expected, the Li3V2(PO4)(3)/C nanocomposite demonstrates an excellent high-rate and long-term cycling performance as well as broad temperature adaptability. Even at a high rate of 16C, a high capacity of 102 mA h g(-1) can be achieved. Importantly, the capacity retention is 99% after 1000 cycles and 94% after 2000 cycles when cycled at a rate of 6 C at room temperature in a voltage range of 3-4.3 V. Importantly, this nanocomposite can cycle at 30 degrees C for SOO cycles with a stable capacity. The excellent rate capability, stable cycling performance, and broad temperature adaptability suggest that the Li3V2(PO4)(3)/C nanocomposite is a promising cathode for practical applications.
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