Mesoporous Carbon as Conductive Additive to Improve the High‐Rate Charge/Discharge Capacity of Lithium‐ion Batteries
Mesoporous Carbon as Conductive Additive to Improve the High‐Rate Charge/Discharge Capacity of Lithium‐ion Batteries
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介孔碳作为导电添加剂提高锂离子电池的高倍率充/放电能力
DOI：
10.1002/ente.202200472
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发表时间：
2022-06
影响因子：
3.8
通讯作者：
Yang Dong
中科院分区：
文献类型：
--
作者：
Xue Shuqing;Wang Jinxiu;Xia Yan;Wang Yun;Jiang Wenfeng;Dong Angang;Yang Dong
电解质在电极中的渗透能力对锂离子电池（LIB）的高倍率充电/放电容量至关重要。本文中，具有丰富且连续的介孔通道的介孔碳用作LIB中的导电添加剂以增强电解质的渗透。中孔碳的Li+扩散系数为1.65 × 10−9 cm s−1，远高于碳纳米管（2.5 × 10−10 cm s−1）和炭黑（1.6 × 10−10 cm s−1）。结果表明，使用介孔碳作为导电添加剂的LiFePO 4阴极基LIB显示出优异的高倍率充放电容量，在5C下为121 mAh g−1，在30 C下为54 mAh g−1。当LiFePO 4电极的压实密度从0.7增加到1.3 g cm−3时，LIB仍然可以在3 C下提供101 mAh g−1的容量。这项工作为轻松提高锂离子电池的快速充放电性能开辟了一条新途径。
The infiltration ability of electrolytes in to the electrode is vital to the high-rate charge/discharge capacity of lithium-ion batteries (LIBs). Herein, mesoporous carbon is used with abundant and continuous mesoporous channels as the conductive additive in LIBs to enhance the infiltration of electrolytes. The Li+ diffusion coefficient of the mesoporous carbon is 1.65 × 10−9 cm s−1, much higher than that of carbon nanotubes (2.5 × 10−10 cm s−1) and carbon black (1.6 × 10−10 cm s−1). It is demonstrated that LiFePO4 cathode-based LIBs using mesoporous carbon as the conductive additive exhibit excellent high-rate charge/discharge capacities of 121 mAh g−1 at 5 C and 54 mAh g−1 at 30 C. When the compaction density of the LiFePO4 electrode increases from 0.7 to 1.3 g cm−3, the LIBs can still deliver a capacity of 101 mAh g−1 at 3 C. This work paves a new route to facilely improve the quick charge/discharge performance of LIBs.