无烟煤基石墨的制备及储锂性能  

Preparation and lithium storage of anthracite-based graphite anode materials

作　　者：李圆 田晓冬[1] 宋燕[1,2] 杨桃 武世杰[1,2] 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)

机构地区：[1]中国科学院山西煤炭化学研究所,中国科学院炭材料重点实验室,山西太原030001 [2]中国科学院大学材料与光电研究中心,北京100049

出　　处：《新型炭材料（中英文）》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).

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.

关 键 词：无烟煤 催化石墨化 锂离子电池 负极材料 

分 类 号：TQ127.11[化学工程—无机化工]