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矿 冶 工 程 MINING AND METALLURGICAL ENGINEERING 第 36卷第 2期 2016年 04月 Vol.36 №2 April 2016 锂离子电池硅碳负极用壳聚糖粘结剂的性能研究 ① 徐丹琼,郭华军,周 玉,唐唯佳,周 融,张睿奇 (中南大学冶金与环境学院,湖南长沙 410083) 摘 要:研究了壳聚糖(CS)粘结剂在锂离子电池硅碳负极中的性能。通过 XRD、红外光谱和 SEM表征粘结剂和电极的结构与形 貌,测试了粘结剂的剥离强度,通过电化学性能和电极动力学比较了壳聚糖与聚偏氟乙烯(PVDF)作为粘结剂对硅碳复合材料电化 学性能的影响。结果表明:CS粘结剂和 PVDF粘结剂极片剥离强度分别为 10.5和 7.6 N/ m,水溶性高分子 CS粘结力更强 ;CS、 PVDF作为硅碳负极粘结剂首次可逆比容量分别为 572.4和 568.3 mAh/ g,首次库伦效率分别为 78.4%和 79.5%,50次循环后容量保 持率分别为 72.3%和 65.8%。与 PVDF相比,CS更适合应用于锂离子电池硅碳负极材料中。 关键词:锂离子电池;负极材料;硅碳负极;粘结剂;壳聚糖;电化学性能 中图分类号: TM912 文献标识码: A doi:10.3969/ j.issn.0253-6099.2016.02.029 文章编号: 0253-6099(2016)02-0108-04 Performance of Chitosan as the Binder for Si/ C Anode of Li?ion Batteries XU Dan?qiong, GUO Hua?jun, ZHOU Yu, TANG Wei?jia, ZHOU Rong, ZHANG Rui?qi (School of Metallurgy and Environment, Central South University, Changsha 410083, Hunan, China) Abstract: With Chitosan(CS) as the binder for Si/ C anode of lithium?ion batteries, X?ray diffractometry (XRD), Fourier transform infrared spectra (FI?IR) and scanning electron microscopy (SEM) were used to characterize the structure and morphology of the binder and electrodes, and peel strength of the binder was measured in the tests. The effect of chitosan as binder on the electrochemical performance of Si/ C composite was investigated in comparison with poly (vinylidene fluoride) (PVDF) binder in terms of electrochemical performance and electrode kinetics. Results showed the peel strength of the CS and PVDF were respectively 10.5 and 7.6 N / m, composites using CS and PVDF separately as the binder had the initial reversible specific capacity