摘要
以片状微米硅粉为硅源,人造石墨、沥青、酚醛树脂等为原料,通过机械球磨、二次造粒、二次包覆和高温碳化等工艺制得硅碳复合材料BSC-1和BSC-2。XRD、SEM和TEM测试表明所制备材料形貌分布规整,物质主要由石墨、Si及SiOx(0<x≤2)和无定形碳组成。电化学性能测试表明,二次包覆改性后具有核-壳结构材料BSC-2相比于未改性BSC-1,具有更高的可逆比容量和良好的倍率及循环性能,0.5 C倍率下循环24周后,材料比容量稳定在383.3 mAh/g以上,容量保持率接近100%。
Flake-nano-Si/graphite composite anode materials BSC-1 and BSC-2 were prepared by mechanical ball milling,secondary granulation,secondary coating and high temperature carbonization with flake micro silicon as silicon source,artificial graphite,asphalt and phenolic resin as raw materials.The results of XRD,SEM and TEM showed that the morphology of the prepared materials were well distributed,and the materials were mainly composed of graphite,Si,SiOx(0<x≤2)and amorphous carbon.The electrochemical performance test showed that the core-shell structure material BSC-2 had higher reversible specific capacity,better ratio and cycle performance than the unmodified material BSC-1.After 24 cycles at the ratio of 0.5 C,the specific capacity of the material BSC-2 was stable above 383.3 mAh/g and the capacity retention rate was close to 100%.
作者
王兴蔚
侯佼
贺超
杨丹
王北平
侯春平
WANG Xing-wei;HOU Jiao;HE Chao;YANG Dan;WANG Bei-ping;HOU Chun-ping(Ningxia BOLT Technologies Co.,Ltd.,Ningxia Yinchuan 750011;North Minzu University,Ningxia Yinchuan 750021,China)
出处
《广州化工》
CAS
2020年第20期42-45,共4页
GuangZhou Chemical Industry
基金
宁夏回族自治区重点研发计划(2018BEB04014)
中国工程院咨询研究项目(2019NXZD5)。
关键词
锂离子电池
硅碳复合负极材料
核壳结构
电化学性能
lithium ion battery
silicon carbon composite anode material
core-shell structure
electrochemical performance
