电解质
溶解
阴极
相(物质)
材料科学
电导率
锂(药物)
离子电导率
离子
锂离子电池
分析化学(期刊)
化学工程
电池(电)
化学
无机化学
电极
物理化学
热力学
物理
色谱法
工程类
内分泌学
医学
功率(物理)
有机化学
作者
Liangtao Yang,Yonggao Xia,Laifen Qin,Guoxia Yuan,Bao Qiu,Junli Shi,Zhaoping Liu
标识
DOI:10.1016/j.jpowsour.2015.11.037
摘要
It is a great challenge to combine good cycling performance with high rate capability for LiMn1–xMxPO4 cathode materials owing to the Mn dissolution upon cycling and its low electronic/ionic conductivity. Here, we report a novel concentration-gradient structure of LiMn0.8Fe0.2PO4 material constructed by solvothermal treatment. This material shows a linear increase of Mn concentration from the edge to the particle centre, but the inverse trend for Fe concentration, which leads to the formation of Mn-rich phase in bulk and Fe-rich phase at surface. The Fe-rich phase effectively suppresses the corrosion from the electrolyte that minimizes the Mn dissolution and also improves the electronic/ionic conductivity of the surface that decreases the cathode/electrolyte interface resistance. Consequently, this concentration-gradient material achieves superior capacity retention with 98% after 50 cycles at 1 °C even at elevated temperature, and also exhibits an excellent rate capability with the reversible capacity of 130 mA h g−1 at 5 °C rate. These results suggest that the concentration-gradient LiMn0.8Fe0.2PO4 is an ideal type of cathode material for high performance Lithium ion batteries.
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