Electrochemical performance of LiMnPO4 by Fe and Zn co-doping for lithium-ion batteries
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- 作者：Huihua Yi ; Chenglin Hu ; Xiangming He ; Hongyun Xu
- 关键词：Lithium ; ion batteries ; Lithium manganese phosphate ; Cathode ; Doping ; Magnesium dissolution
- 刊名：Ionics
- 出版年：2015
- 出版时间：March 2015
- 年：2015
- 卷：21
- 期：3
- 页码：667-671
- 全文大小：929 KB
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- 刊物主题：Chemistry
Electrochemistry
Materials Science
Physical Chemistry
Condensed Matter
Renewable Energy Sources
Electrical Power Generation and Transmission - 出版者：Springer Berlin / Heidelberg
- ISSN：1862-0760
文摘
To study the effect of Fe and/or Zn doping on the performance of LiMnPO4, LiMn0.9Fe0.1?em class="a-plus-plus">x Zn x PO4/C (x--, 0.05, and 0.1) composites were synthesized by a solid-state process. They are all single phase with olivine structure but LiMn0.9(FeZn)0.05PO4/C reveals a different morphology. The Fe-Zn co-doping remarkably enhances the performance of LiMnPO4 due to the presence of Fe and Zn in olivine framework resulting in the decrease of charge transfer resistance and Mn ion dissolution. Compared with LiMn0.9Fe0.1PO4/C and LiMn0.9Zn0.1PO4/C, LiMn0.9(FeZn)0.05PO4/C exhibits much higher discharge capacity and better rate capability. It delivers the capacities of 151.3?mAh?g? at 0.1?C and 128.4?mAh?g? at 1?C and retains 96.7?% of the initial capacity after 100?cycles.