期刊
JOURNAL OF POWER SOURCES
卷 329, 期 -, 页码 553-557出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2016.08.131
关键词
Lithium vanadium fluorophosphates; Cathode material; Lithium ion battery; Lithium phosphate coating; Interfacial stability
资金
- National Natural Science Foundation of China [51574287, 21501015]
- Fundamental Research Funds for the Central Universities of Central South University [2016zzts274]
- Project of Innovation driven Plan in Central South University [2015CX001]
To improve the stability of LiVPO4F electrode/electrolyte interface, Li3PO4 is used to modify LiVPO4F composite (P-LVPF) for the first time. Morphological characterization shows that LiVPO4F particles are wrapped by amorphous carbon and lithium ionic conductor Li3PO4 as the interlayer and outer layer, respectively. Compared to the pristine sample, the resultant P-LVPF exhibits greatly improved rate capability and elevated-temperature cycle performance when applied as the cathode material for lithium ion batteries. Specifically, the Li3PO4 modified sample specific capacity maintains 77.6% at 1 C after 100 cycles under 55 degrees C. Such improvement is attributed to the fact that the Li3PO4 coating layer not only acts as a good ionic conductor for LiVPO4F, but also serves as a physical barrier between electrode and electrolyte which can build a stable interface. (C) 2016 Elsevier B.V. All rights reserved.
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