Synthesis of high-performance Fe–Mg-co-doped LiMnPO4/C via a mechano-chemical liquid-phase activation technique
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- 作者：Jianguo Duan ; Guorong Hu ; Yanbing Cao ; Ke Du ; Zhongdong Peng
- 刊名：Ionics
- 出版年：2016
- 出版时间：May 2016
- 年：2016
- 卷：22
- 期：5
- 页码：609-619
- 全文大小：1,838 KB
- 刊物类别：Chemistry and Materials Science
- 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
- 卷排序：22
文摘
Carbon-coated Fe–Mg-homogeneously dispersed Li(Mn0.9Fe0.10)1 − xMgxPO4/C (x = 0.00, 0.01, 0.03, 0.05, and 0.07) powders are synthesized via a mechano-chemical liquid-phase activation technique. Fine-sized and Fe2+ and Mg2+ evenly distributed precursors are formed using this efficient approach successfully. The synthesis temperature and the Mg2+ doping ratio are investigated and optimized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and electrochemical measurements. Mg doping decreases the lattice parameters of LiMn0.9Fe0.1PO4/C, which will ease the expansion/shrinking effect during the insertion/de-insertion processes. Li(Mn0.9Fe0.1)0.95Mg0.05PO4/C synthesised at 700 °C with ~3 wt% of carbon additive presents the best comprehensive electrochemical properties, and it displays good rate capability with specific discharge capacity of 153 mAh g−1 at 0.1C, 140 mAh g−1 at 1C, and 132 mAh g−1 at 2C rate. The results suggest that the electrochemical performance of the LiMnPO4-based cathode is improved as (Mn0.9Fe0.1) is partially substituted by Mg.KeywordsLi-ion batteriesDopingCathodesElectrochemical characterizationsMaterial preparations