锂离子电池用石墨负极材料制备与改性  

Preparation and Modification of Graphite Negative Electrode Materials for Lithium-ion Batteries

作　　者：韦珍海 WEI Zhenhai

机构地区：[1]广东凯金新能源科技股份有限公司,广东东莞523000

出　　处：《上海化工》2024年第6期15-18,共4页Shanghai Chemical Industry

摘　　要：使用天然石墨粉、沥青粉作为原料,以酚醛树脂对内核进行包覆,制备了一种改性石墨负极材料。利用激光粒度仪、X射线衍射仪、扫描电子显微镜等对样品的结构、形态进行表征,结果表明制备的天然石墨表面被酚醛树脂包覆,且膜层包覆效果很好,石墨晶型结构更好,结晶度更高。所得改性石墨负极材料的D50约为11.9μm,其粒径分布峰尖而窄,颗粒分布良好。采用该负极材料制备了扣式电池并测试其电性能和循环充放电性能,首次放电比容量和库伦效率分别为768 m Ah/g和64.06%,循环30圈充放电过程中,扣式电池的放电都很平稳,可以有效地供给用电器平稳的电流,具有稳定的综合电化学性能。A modified graphite negative electrode material was prepared by coating the core with phenolic resin using natural graphite powder and asphalt powder as raw materials.The structure and morphology of the sample were characterized by using laser particle size analyzer,X-ray diffractometer,scanning electron microscope,etc.The results showed that the surface of the prepared natural graphite was coated with phenolic resin,and the coating effect was good.The graphite crystal structure was better and the crystallinity was higher.The modified graphite negative electrode material obtained had a D50 of about 11.9μm,a sharp and narrow particle size distribution peak,and good particle distribution.A button type battery was prepared using this negative electrode material and its electrical performance and cyclic charge-discharge performance were tested.The first discharge specific capacity and coulombic efficiency were 768 mAh/g and 64.06%,respectively.During the 30 cycles of charge and discharge,the button type battery discharged stably and could effectively supply stable current to the electrical appliances,demonstrating stable comprehensive electrochemical performance.

关 键 词：锂电池 石墨负极 制备 改性 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]