Magnetic impurity effects on self-discharge capacity, cycle performance, and rate capability of LiFePO4/C composites

Kai Pin Huang, George Ting Kuo Fey*, Yi Chuan Lin, Pin Jiun Wu, Jeng-Kuei Chang, Hsien Ming Kao

*此作品的通信作者

研究成果: Article同行評審

8 引文 斯高帕斯(Scopus)

摘要

Battery manufacturers pay a great deal of attention to the reproducibility of LiFePO4/C composites. Poor reproducibility of self-discharge capacity, cycle performance, and rate capability seriously affects the balance of battery packs. We have found that the above properties strongly depend on the level of magnetic impurities present. The existence of trace magnetic impurities produced from a sintering process can significantly poison the self-discharge capacity of LiFePO4/C materials. In this work, the magnetic impurity-removed LiFePO4/C composites exhibited the best discharge capacity of 158 mAh g−1 at 0.2 C and excellent cycle performance with a capacity retention of 92% after 500 cycles at 5 C. Self-discharge experiments showed that the purified LiFePO4/C maintains 97% residual capacity after a week at 0.5 C, which is better than the others containing magnetic impurities. We applied a new alternative current magnetic susceptibility device to quantify the impact of magnetic impurities on LiFePO4/C composites. This method is rapid, effective, inexpensive, and nondestructive, which makes it a useful quality control tool for practical lithium battery applications.

原文English
頁(從 - 到)1767-1775
頁數9
期刊Journal of Solid State Electrochemistry
21
發行號6
DOIs
出版狀態Published - 1 6月 2017

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