摘要
以无烟煤为原料,以工业硅粉为催化剂进行催化石墨化,制备了具有不同微观结构的煤基石墨,分析了催化反应机制,并考察了所制备的煤基石墨作为锂离子电池负极的电化学性能,进行了结构与性能的相关性研究。结果表明:当催化剂质量分数为5%时,所得石墨(G-2800-5%)的微晶尺寸较大,有序度较高,石墨化度为91.5%。将其用作锂离子电池负极材料时,表现出较好的电化学特性,在0.1 A g^(−1)电流密度下稳定可逆容量为369 mAh g^(−1),当电流密度增大至1 A g^(−1),依然保持了209 mAh g^(−1)的容量,在0.2 A g^(−1)电流密度下循环200次的容量保持率可达92.2%。G-2800-5%样品石墨结构有序度高,表面形成的SEI膜薄均匀且锂离子的不可逆损失少,因此,其综合电化学性能较好。
Several graphite samples with different microstructures were prepared from anthracite using industrial silicon powders as catalyst.The mechanism of the catalytic reaction and the electrochemical properties of the prepared coal-based graphite in lithium anodes were investigated.The correlation between the microstructure and the properties of the graphite is discussed.Results show that the sample with 5%silicon(G-2800-5%)has the best lithium storage.It has the well-developed graphitic structure with a degree of graphitization of 91.5%as determined from the interlayer spacing.When used as an anode material,a high reversible capacity of 369.0 mAh g^(−1) was achieved at 0.1 A g^(−1) and its reversible capacity was 209.0 mAh g^(−1) at a current density of 1 A g^(−1).It also exhibits good cycling stability with a capacity retention of 92.2%after 200 cycles at 0.2 A g^(−1).The highly developed graphite structure,which is favorable for the formation of a stable SEI and therefore reduces lithium ion loss,is responsible for the superior electrochemical performance.
作者
李圆
田晓冬
宋燕
杨桃
武世杰
刘占军
LI Yuan;TIAN Xiao-dong;SONG Yan;YANG Tao;WU Shi-jie;LIU Zhan-jun(CAS Key Laboratory of Carbon Materials,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《新型炭材料（中英文）》
SCIE
EI
CAS
CSCD
北大核心
2022年第6期1163-1171,共9页
New Carbon Materials
基金
国家自然科学基金(52072383,U1610252),山西省自然科学基金(201801D221371),山西省优秀博士引进资助(SQ2019001).
关键词
无烟煤
催化石墨化
锂离子电池
负极材料
Anthracite
Catalytic graphitization
Lithium ion battery
Anode materials
作者简介
李圆,硕士研究生.E-mail:1057252495@qq.com;通讯作者:宋燕,研究员.E-mail:songyan@sxicc.ac.cn;通讯作者:田晓冬,助理研究员.E-mail:tianxiaodong0124@163.com。
