Structural and electrochemical properties of LiFe1??-x/2Bi x PO4/C synthesized by sol–gel
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- 作者：Fuwei Mao (1)
Dongchen Wu (1)
Zhufa Zhou (1)
Shumei Wang (1) - 关键词：Lithium ; ion batteries ; LiFePO4 ; Bi doping ; Electrochemical properties
- 刊名：Ionics
- 出版年：2014
- 出版时间：December 2014
- 年：2014
- 卷：20
- 期：12
- 页码：1665-1669
- 全文大小：754 KB
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Shumei Wang (1)
1. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, People’s Republic of China - ISSN：1862-0760
文摘
In this study, LiFe1??-x/2Bi x PO4/C cathode material was synthesized by sol–gel method. From XRD patterns, it was found that the Bi-doped LiFePO4/C cathode material had the same olivine structure with LiFePO4/C. SEM studies revealed that Bi doping can effectively decrease the particle sizes. It shortened Li+ diffusion distance between LiFePO4 phase and FePO4 phase. The LiFe0.94Bi0.04PO4/C powder exhibited a specific initial discharge capacity of about 149.6?mAh?g? at 0.1 rate as compared to 123.5?mAh?g? of LiFePO4/C. EIS results indicated that the charge-transfer resistance of LiFePO4/C decreased greatly after Bi doping.