补锂粘结剂羧甲基纤维素锂(CMC-Li)的合成与应用研究  

Study on synthesis and application of lithium carboxymethylcellulose (CMC-Li) as lithium replenishing binder

作　　者：邱磊 李富 杨稳 陈允 胡学步[1] QIU Lei;LI Fu;YANG Wen;CHEN Yun;HU Xuebu(College of Chemistry and Chemical,Chongqing University of Technology,Chongqing 400054,China;Chongqing Yilong Paints Inc.,Ltd.,Chongqing 402260,China;Green Energy Cellulose Materials(Chongqing)Technology Co.,Ltd.,Chongqing 400054,China)

机构地区：[1]重庆理工大学化学化工学院,重庆400054 [2]重庆亿隆涂料股份有限公司,重庆402260 [3]绿能纤材(重庆)科技有限公司,重庆400054

出　　处：《重庆理工大学学报（自然科学）》2023年第4期133-140,共8页Journal of Chongqing University of Technology：Natural Science

基　　金：重庆市科技委员会自然科学基金项目(cstc2019jcyj-msxmX0165);重庆市教育委员会基金项目(KJQN201901110);重庆理工大学青年专项基金项目(2019ZD01);重庆市巴南区科技创新基金项目(2020QC391)。

摘　　要：以纤维素粉和乙醇锂为原材料,通过IR分析显示成功合成得到羧甲基纤维素锂(CMC-Li)。分别以CMC-Li和羧甲基纤维素钠(CMC-Na)作为锂离子电池负极粘结剂进行研究,发现CMC-Li表现出比较优秀的悬浮和分散性能,不与电解液发生反应,稳定性好。同时,在相同条件下,CMC-Li可以提高电极的压实密度、吸液速率和吸液量,减少极化现象,降低内阻10%左右,减少物理反弹约14.5%,使得充放电比容量提高约1%,剥离强度提高约9.8%,首效提高约2%,循环寿命延长约12%,有着非常优秀的补锂效果。By using cellulose powder and lithium ethoxide as the raw materials,this paper successfully synthesizes lithium carboxymethyl cellulose(CMC-Li)through IR analysis.With CMC-Li and sodium carboxymethyl cellulose(CMC-Na)being respectively used as the negative electrode binder for lithium-ion batteries,it is found that CMC-Li displays excellent suspension and dispersion performance and does not react with the electrolyte,which shows a good stability.At the same time,under the same conditions,CMC-Li can improve the compaction density of the electrode,increase the liquid absorption rate and amount,reduce the polarization,decrease the internal resistance by about 10%and decrease the physical rebound by about 14.5%.The specific capacity of charge and discharge increases by about 1%,the peeling strength increases by about 9.8%,the first effect increases by about 2%,and the cycle life is extended by about 12%.It has a very excellent lithium supplementation effect.

关 键 词：乙醇锂 羧甲基纤维素锂 粘结剂 补锂效果 锂离子电池 

分 类 号：TQ340.6[化学工程—化纤工业]