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Ultrafast and Durable Lithium Storage Enabled by Porous Bowl‐Like LiFePO 4 /C Composite with Na + Doping
Author(s) -
Wang Boya,
Wang Yan,
Wu Hao,
Yao Lei,
Yang Li,
Li Jianlong,
Xiang Mingwu,
Zhang Yun,
Liu Heng
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201600854
Subject(s) - crystallinity , materials science , lithium (medication) , composite number , chemical engineering , electrochemistry , salt (chemistry) , doping , ammonium , porosity , precipitation , sodium , composite material , chemistry , organic chemistry , electrode , medicine , physics , optoelectronics , meteorology , engineering , metallurgy , endocrinology
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.