文献类型：期刊文献

英文题名：Effect of Microcracks on Graphite Anode Materials for Lithium-Ion Batteries

作者：Ma, Jingbo Li, Yanan Gao, Hong Chen, Qianlin Yang, Min

第一作者：Ma, Jingbo

通信作者：Chen, QL[1];Yang, M[1]

机构：[1]Guizhou Univ, Coll Chem & Chem Engn, Guiyang 550000, Peoples R China;[2]Guizhou Univ Tradit Chinese Med, Sch Pharmaceut Sci, Guiyang 550000, Peoples R China;[3]Guizhou Inst Technol, Elect & Informat Engn Coll, Guiyang 550000, Peoples R China

第一机构：Guizhou Univ, Coll Chem & Chem Engn, Guiyang 550000, Peoples R China

通信机构：corresponding author), Guizhou Univ, Coll Chem & Chem Engn, Guiyang 550000, Peoples R China.

年份：2020

卷号：5

期号：19

起止页码：5742-5747

外文期刊名：CHEMISTRYSELECT

收录：;Scopus(收录号：2-s2.0-85085337042);WOS:【SCI-EXPANDED(收录号:WOS:000535017800031)】；

基金：The authors are grateful for the financial support from the High-level Innovative Talents Training Project of Guizhou Province (OKHPTRC [2016] 5658), the Project Establishment of Research Fund for Postgraduates in Guizhou Province (YJSCXJH(2018) 081), and the Science and Technology Program of Guizhou Province ([2019] 1131).

语种：英文

外文关键词：Graphite; Lithium-Ion Batteries; Microwave; Microwcrack

摘要：Modified graphite with microcracks was obtained by a combination of microwave heating and KOH activation. KOH enhanced the degree of order of the graphite, and K+ increased the spacing of the graphite layer. Microwave heating caused microcracks on graphite and promoted doping of K+ into the graphite. The microcracks could increase the contact area of electrode materials and electrolytes and decrease diffusion length. Furthermore, the uniform microcracks dispersed the pressure of the electrode wetted by the electrolyte, relieved stress during lithium removal and increased the degree of order of the graphite. The modified graphite has a capacity of 449 mAh g(-1) at 0.1 C, 380 mAh g(-1) at 0.25 C and 367 mAh g(-1) at 0.5 C. In addition, the capacity retention rate was 96.1% after one hundred cycles at 0.25 C, and the average coulombic efficiency was 99.4%.