结晶度
复合数
材料科学
锂(药物)
电化学
盐(化学)
化学工程
铵
兴奋剂
降水
钠
多孔性
复合材料
化学
光电子学
电极
物理
有机化学
气象学
冶金
物理化学
内分泌学
工程类
医学
作者
Boya Wang,Yan Wang,Hao Wu,Lei Yao,Yang Li,Jianlong Li,Mingwu Xiang,Yun Zhang,Heng Liu
标识
DOI:10.1002/celc.201600854
摘要
Abstract Porous bowl‐like LiFePO 4 /C composites are prepared by using the ammonium salt and sodium salt processes with a facile precipitation method coupled with spray‐drying technology. Both of the as‐prepared LiFePO 4 /C composites present high crystallinity, bowl‐like morphology, and uniform carbon‐layer‐coated particles. Compared with the traditional ammonium salt process, the sodium salt process, without ammonia nitrogen pollutants, is not only environmentally friendly, but also allows us to introduce appropriate Na + doping within the resultant LiFePO 4 . Moreover, the LiFePO 4 /C composite prepared by using the sodium salt process exhibits better electrochemical performance: a high rate capability (136, 129, and 119 mAh g −1 at 10, 20, and 40 C rate, respectively) and a long cycle stability (60.3 % of initial capacity after 3000 cycles at 10 C, only corresponding to 0.013 % capacity decay per cycle) compared with the other (only exhibits a capacity of 123, 107, and 62 mAh g −1 at rate of 10, 20, and 40 C and retains a 37.5 % of initial capacity after 3000 cycles at 10 C). This good electrochemical performance originates from its special morphology, high crystallinity, stable structure, and Na + doping.
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