天然鳞片石墨球化尾料的高性能负极材料制备及储锂特性研究  

Preparation and lithium storage characteristics of high-performance anode materials based on spheroidized tailings of natural flake graphite

作　　者：周向阳 胡颖杰 梁家浩 周其杰 文康 陈松 杨娟 唐晶晶 ZHOU Xiangyang;HU Yingjie;LIANG Jiahao;ZHOU Qijie;WEN Kang;CHEN Song;YANG Juan;TANG Jingjing(School of Metallurgical and Environment,Central South University,Changsha 410083,Hunan,China;Hunan Chenyu-Fuji New Energy Technology Co.,Ltd.,Changde 415137,Hunan,China)

机构地区：[1]中南大学冶金与环境学院,湖南长沙410083 [2]湖南宸宇富基新能源科技有限公司,湖南常德415137

出　　处：《储能科学与技术》2023年第9期2767-2777,共11页Energy Storage Science and Technology

基　　金：宸宇富基资助的锂离子电池快充石墨制备工艺优化项目。

摘　　要：以天然鳞片石墨球化尾料(球化微粉)为原料,将其纯化、与沥青混料、等静压压制成型、碳化、破碎及筛分处理,制备了可应用于锂离子电池的石墨负极材料(SG/C)。采用场发射扫描电子显微镜(FESEM)、X射线衍射(XRD)、氮气吸附、激光粒度仪、X射线荧光光谱仪(XRF)及电化学方法等表征测试手段,研究了沥青加入量、碳化升温速率及碳化温度对SG/C材料的理化性能及电化学性能的影响。结果表明,在沥青添加量为10%、碳化升温速率为2℃/min、碳化温度为1000℃的优化处理条件下,所得SG/C-V2-1000材料表现出最优的电化学性能。其在0.1 C倍率下的首次可逆比容量为352.4 mAh/g,首次库仑效率为93.12%;在0.2 C倍率循环400圈后的容量保持率为79%,在0.5 C倍率下循环200圈后的容量保持率为85%。该研究对于实现天然鳞片石墨球化微粉的高值化利用提供了实验依据。A graphite anode electrode material(SG/C)suitable for lithium-ion batteries was prepared using spheroidized tailings(spheroidized micropowder)of natural flake graphite as raw materials.They were purified,mixed with asphalt,isostatically pressed,carbonized,crushed,and underwent screening treatment.The effects of asphalt addition,carbonization heating rate,and carbonization temperature on the physicochemical and electrochemical properties of SG/C materials were studied using characterization methods such as field emission scanning electron microscopy(FESEM),X-ray diffraction(XRD),nitrogen adsorption isotherms,laser particle size analyzer,X-ray fluorescence spectrometer(XRF),and electrochemical methods.The results showed that under the optimized treatment conditions of 10%asphalt addition,2℃/min carbonization heating rate,and 1000℃carbonization temperature,the obtained SG/C-V2-1000 material exhibited the optimal electrochemical performance.Its first reversible specific capacity at 0.1 C magnification was 352.4 mAh/g,and its first Coulombic efficiency was 93.12%.The capacity retention rate after 400 cycles at a 0.2 C magnification was 79%,and after 200 cycles at a 0.5 C magnification,the capacity retention rate was 85%.This study provides the experimental basis for transforming spheroidized micropowders of natural flake graphite into high-value materials.

关 键 词：锂离子电池 天然鳞片石墨 石墨负极材料 球化微粉 高值化利用 

分 类 号：TM242[一般工业技术—材料科学与工程] TQ152[电气工程—电工理论与新技术]