文献类型：期刊文献

中文题名：CMC-Na/PEI水溶性粘结剂在Si/C电极中的性能研究

英文题名：Performance of CMC-Na/PEI Water-soluble Binder in Si/C Electrode

作者：孙兴燊[1,2,3] 郭丽珍[1] 江梅珍[2] 范荣玉[2] 赵升云[2] 刘鹤[1] 宋湛谦[1]

第一作者：孙兴燊

机构：[1]中国林业科学研究院林产化学工业研究所,江苏省生物质能源与材料重点实验室,国家林业和草原局林产化学工程重点实验室,林木生物质低碳高效利用国家工程研究中心,江苏南京210042;[2]武夷学院,福建省生态产业绿色技术重点实验室,绿色化工技术福建省高等学校重点实验室,福建武夷山354300;[3]南京林业大学江苏省林业资源高效加工利用协同创新中心,江苏南京210037

年份：2026

卷号：46

期号：1

起止页码：81-90

中文期刊名：林产化学与工业

外文期刊名：Chemistry and Industry of Forest Products

收录：;北大核心:【北大核心2023】；

基金：江苏省生物质能源与材料重点实验室基本科研业务费项目(JSBEM-S-202201);福建省科技创新重点项目(2021G02014);福建省自然科学基金资助项目(2023J011054)。

语种：中文

中文关键词：硅碳负极;羧甲基纤维素钠;聚乙烯亚胺;粘结剂;锂离子电池

外文关键词：Si/C negative electrode;CMC-Na;PEI;binder;lithium-ion battery

分类号：TQ35

摘要：硅碳复合材料(Si/C)在反复脱锂-嵌锂过程中,硅材料巨大的体积膨胀易引起电极材料粉碎、脱落和失去电接触,最终造成电极循环性能变差,通过设计新型水溶性粘结剂能有效提升Si/C电极的循环性能。将林业资源纤维素的衍生物羧甲基纤维素钠(CMC-Na)和聚乙烯亚胺(PEI)进行简单的物理共混,基于聚阴离子和聚阳离子易形成静电相互作用的原理,构建具有三维网状结构的水溶性粘结剂(C-PEI),并以商业化油溶性聚偏氟乙烯(PVDF)和CMC-Na粘结剂作为对比。采用FT-IR和Zeta电位分析表征其结构,探究了C-PEI粘结剂的粘附性能和长效循环性能。研究结果表明:聚阴离子型多糖CMC-Na与聚阳离子型化合物PEI之间存在氢键作用和静电相互作用。制备的Si/C@C-PEI电极平均剥离力为2.33 N,优于Si/C@PVDF电极的1.12 N和Si/C@CMC-Na电极的1.89 N。在电流密度0.5C(1C=950 mA·h/g)下循环240圈,Si/C@C-PEI电极的放电比容量为418.9 mA·h/g,高于Si/C@PVDF电极(174.9 mA·h/g)和Si/C@CMC-Na电极(333.0 mA·h/g)。在1C和2C电流密度下分别循环300圈和500圈,Si/C@C-PEI电极仍能展现出优异的性能,放电比容量分别为397.2和364.3 m A·h/g,明显高于Si/C@PVDF和Si/C@CMC-Na电极。电化学阻抗(EIS)测试发现,C-PEI粘结剂具有更小的电阻和更高的离子电导率。分析表明,基于静电相互作用原理制备的粘结剂C-PEI具有优异的粘结性能,能有效提升Si/C电极循环稳定性。
During the repeated de-lithiation and lithiation of silicon-carbon composites(Si/C),the huge volume expansion of Si material could easily cause electrode material crushing,detachment,and loss of electrical contact,ultimately resulting in poor cycling performance of the electrode.The design of a new water-soluble binder could effectively improve the cycle performance of the Si/C electrode.Here,compared to commercial oil-soluble polyvinylidene fluoride poly(vinylidenefluoride)(PVDF)and cellulose derivatives sodium carboxymethyl cellulose(CMC-Na)binders,a water-soluble binder(C-PEI)with 3D network structure was designed by simply physically blending the CMC-Na derived from forestry resources and polyethylene imide(PEI),exploiting the principle that polyanion and polycation readily formed electrostatic interaction.The structure of C-PEI was characterized by FT-IR and Zeta potential analysis,the adhesion properties and long-term cycle performance of C-PEI binders were examined.The results indicated that there were hydrogen bonding and electrostatic interactions between the polyanionic polysaccharide CMC-Na and the polycationic compound PEI.The average peel strength of prepared Si/C@C-PEI electrode was 2.33 N,which was better than 1.12 N of Si/C@PVDF electrode and 1.89 N of Si/C@CMC-Na electrode.The discharging specific capacity of Si/C@C-PEI electrode was 418.9 mA·h/g after 240 cycles at a current density of 0.5C(1C=950 mA·h/g),which was greater than that of Si/C@PVDF(174.9 mA·h/g)and Si/C@CMC-Na(333.0 mA·h/g).The Si/C@C-PEI electrode still exhibited excellent performance after 300 and 500 cycles at current densities of 1C and 2C.The discharge specific capacities remained 397.2 and 364.3 mA·h/g,respectively,which were significantly higher than those of Si/C@PVDF and Si/C@CMC-Na electrodes.EIS tests revealed that the C-PEI binder exhibited lower resistance and higher ionic conductivity.The analysis showed that the C-PEI binder prepared based on the forming of electrostatic interaction had excellent bond perfermance and could effectively improve the cycling stability of Si/C electrodes.