NDLI: Electrochemical Performance and Capacity Fading Mechanism of LiFePO4 at Different pH Aqueous Electrolyte Solutions

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Electrochemical Performance and Capacity Fading Mechanism of LiFePO4 at Different pH Aqueous Electrolyte Solutions

Content Provider	Semantic Scholar
Author	Yin, Yuan Wen, Yuehua Lu, Yong-Lai Cheng, Jie Cao, Gao-Ping Yang, Yu-Sheng
Copyright Year	2015
Abstract	The electrochemical stability of LiFePO4 in a Li+-containing aqueous electrolyte solution is critically dependent on the pH value of the aqueous solution. It shows a considerable decay in capacity of LiFePO4 upon cycling when the pH value is increased to 11. The mechanism responsible for the capacity fading is extensively investigated by means of cyclic voltammogram, ac impedance, charge/discharge, ex situ X-ray diffraction, and chemical analysis. LiFePO4 is relatively electrochemically stable in LiNO3 aqueous solution with pH=7. But the electrochemical performance of LiFePO4 in aqueous electrolyte is inferior to that in organic electrolyte. It is attributed to the loss of Li and the Fe, P dissolution during prolonged charge-discharge in aqueous medium. A precipitate is formed on the surface of LiFePO4 electrodes. It results in the change of crystalline structure, a large electrode polarization, and capacity fading.
Starting Page	315
Ending Page	322
Page Count	8
File Format	PDF HTM / HTML
DOI	10.1063/1674-0068/28/cjcp1502020
Alternate Webpage(s)	http://cjcp.ustc.edu.cn/hxwlxb_en/ch/reader/create_pdf.aspx?file_no=150208020&flag=&quarter_id=3&year_id=2015
Alternate Webpage(s)	https://doi.org/10.1063/1674-0068%2F28%2Fcjcp1502020
Volume Number	28
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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