(1. 长沙理工大学 公路养护技术国家工程实验室，长沙 410114；
2. 长沙理工大学 汽车与机械工程学院，长沙 410114)
摘 要: 将水溶性羧甲基壳聚糖(C-Cs)作为石墨负极粘结剂，通过测试首次充放电性能、循环性能和倍率性能以及循环前后形貌的变化，并与聚偏氟乙烯(PVDF)作为石墨负极粘结剂的性能进行了比较。结果表明：使用7%(质量分数)C-Cs粘结剂的石墨负极在0.5C(1C可逆比容量为372 mA？h/g)倍率下循环400个周期后，可逆比容量为312 mA？h/g，10C倍率充放电测试下的可逆比容量为252 mA？h/g；经过100次循环之后，使用10%C-Cs粘结剂的石墨负极与使用PVDF为粘结剂的石墨负极相比，其交流阻抗有所降低，有助于电极比容量的提高和循环性能的改善。
关键字: 锂离子电池；石墨负极；羧甲基壳聚糖；水溶性粘结剂
（1. State Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science & Technology, Changsha 410114, China;
2. School of Automobile and Mechanical Engineering, Changsha University of Science and Technology, Changsha 410114, China）
Abstract:The water-soluble carboxymethyl chitosan (C-Cs) was used as binder for graphite anode in lithium-ion batteries. The electrochemical performance of graphite anode using C-Cs as binder was studied by rate performance, cycling stability and the morphology of the graphite anode. The discharge capacity of graphite anodes with 7% C-Cs binder maintains 312 mA？h/g over 400 cycles at 0.5C (1C: 372 mA/g) and exhibits an excellent capacity 252 mA？h/g at a high-rate of 10C. The resistance of the graphite anode using 10%C-Cs as binder is reduced compared with that of 10% PVDF after 100 cycles, which helps to improve the specific capacitance and cycle performance.
Key words: lithium-ion battery; graphite anode; carboxymethyl chitosan; water-soluble binder
