Journal
IONICS
Volume 19, Issue 2, Pages 245-252Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-012-0758-0
Keywords
Lithium-ion battery; LiFePO4; Rheological phase technology; Carbothermal method
Funding
- National Natural Science Foundation of China [50974045]
- Ph. D Programs Foundation of Ministry of Education of China [20092302110052]
- Natural Science Foundation of Heilongjiang Province, China [B200918]
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LiFePO4/C active materials were synthesized via a modified carbothermal method, with a low raw material cost and comparatively simple synthesis process. Rheological phase technology was introduced to synthesize the precursor, which effectively decreased the calcination temperature and time. The LiFePO4/C composite synthesized at 700 A degrees C for 12 h exhibited an optimal performance, with a specific capacity about 130 mAh g(-1) at 0.2C, and 70 mAh g(-1) at 20C, respectively. It also showed an excellent capacity retention ratio of 96 % after 30 times charge-discharge cycles at 20C. EIS was applied to further analyze the effect of the synthesis process parameters. The as-synthesized LiFePO4/C composite exhibited better high-rate performance as compared to the commercial LiFePO4 product, which implied that the as-synthesized LiFePO4/C composite was a promising candidate used in the batteries for applications in EVs and HEVs.
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