期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 12, 页码 9449-9457出版社
AMER CHEMICAL SOC
DOI: 10.1021/am501762x
关键词
LiFePO4/C; ferrous phosphate; polyol; high rate; cyclability
资金
- Science & Technology Department of Sichuan Province [2013GZX01453]
This study introduces an economical and environmentally friendly way of synthesizing LiFePO4/C to be used as cathode material in lithium ion batteries via two processes: (1) the synthesis of LiFePO4/C cathode material using a low cost divalent precursor ferrous phosphate, Fe, (PO4)(2).8H(2)O, as iron source in a polyol process and (2) the modification of the morphology of this precursor by varying the reaction time in a coprecipitation process. The study examines the effects of different structures and morphologies of the precursor on the structure and electrochemical performance of the as-synthesized LiFePO4/C. The LiFePO4/C shows an excellent rate capability and cycle performance, with initial discharge capacities of 153, 128, and 106 mA h at 1 C, 5 degrees C, and 10 degrees C. The capacity retention is respectively 98.7%, 98.2%, and 98.7%, after 10 cycles at the corresponding rates. The capacity retention remains at 97% even after 300 cycles at the rate of 10 degrees C. The outstanding electrochemical performance can be attributed to the improved rate of Li + diffusion and the excellent crystallinity of synthesized LiFePO4/C powders through the modified precursor. Therefore, this is an economical and environmentally friendly way of synthesizing LiFePO4/C to be used as cathode material in lithium ion batteries.
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