摘要
铜箔作为锂离子电池的集流体,其力学性能和表面性能对锂离子电池有着重要的影响.在锂电铜箔的制备过程中添加微量的添加剂是改变其性能的有效方法,但单一添加剂发挥的作用有限.本研究以胶原蛋白、聚二硫二丙烷磺酸钠(SPS)、醇硫丙烷磺酸盐(HP)、N,N-二甲基-二硫代甲酰胺丙烷磺酸钠(DPS)作为复合添加剂,制备了抗拉强度为502.39 MPa、粗糙度为0.737μm、厚度为6μm的锂电铜箔.同时,探究了复合添加中DPS对铜箔电化学特性、表面微观性能和晶体结构的影响.结果表明:DPS的加入减小了铜箔的晶粒尺寸,提高了晶界密度,减弱了(111)晶面择优取向,从而增加了位错运动阻力,提升了铜箔的力学性能;DPS、SPS、HP三者之间存在协同作用,加强了与胶原蛋白的竞争吸附,进一步细化了铜晶粒,改善了铜箔的表面性能;DPS通过细化晶粒尺寸、增大晶界面积,有效抑制晶体滑移,降低应力集中程度,从而实现铜箔力学性能的提升.
As the current collector of lithium-ion batteries,copper foil significantly influences the battery’s mechanical and surface properties.Adding trace amounts of additives during the preparation of lithium-ion battery copper foil is an effective method to alter these properties,although the effect of a single additive is limited.In this study,a composite additive consisting of collagen,sodium bis(3-sulfopropyl)disulfide(SPS),3-mercapto-1-propanesulfonate(HP),and sodium N,N-dimethyl-dithiocarbamoyl propyl sulfonate(DPS)was used to prepare lithium-ion battery copper foil with a tensile strength of 502.39 MPa,a roughness of 0.737μm,and a thickness of 6μm.The influence of DPS on the electrochemical characteristics,surface microstructure,and crystal structure of the copper foil was investigated.The results indicate that the addition of DPS reduces the grain size of the copper foil,increases the grain boundary density,and weakens the preferred orientation of the(111)crystal plane,thereby enhancing the resistance to dislocation motion and improving the mechanical properties of the copper foil.Furthermore,a synergistic effect exists among DPS,SPS,and HP,which strengthens the competitive adsorption with collagen,further refines the copper grains,and improves the surface properties of the copper foil.DPS can effectively inhibit crystal slip and reduce stress concentration by refining the grain size and increasing the grain boundary area,so as to improve the mechanical properties of copper foil.
作者
赵嫚
廖娟
赵蒙
刘伟飞
唐云志
樊小伟
ZHAO Man;LIAO Juan;ZHAO Meng;LIU Weifei;TANG Yunzhi;FAN Xiaowei(College of Chemistry and Chemical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)
出处
《昆明理工大学学报(自然科学版)》
北大核心
2025年第4期17-25,共9页
Journal of Kunming University of Science and Technology(Natural Science)
基金
国家自然科学基金项目(22365017)
江西省自然科学基金重点项目(20202ACB202001)
江西省重点研发项目(20224BE51045,20212BE51018,20223BH80010)
江西省教育厅项目(GJJ210831).
关键词
电解铜箔
复合添加剂
锂电铜箔
抗拉强度
electrolytic copper foil
composite additives
lithium-ion battery copper foil
tensile strength
作者简介
赵嫚(2000-),女,硕士研究生.主要研究方向:锂电铜箔.E-mail:zm000307@163.com;通信作者:唐云志(1975-),男,博士,教授,博士生导师.主要研究方向:电解铜箔.E-mail:tangyunzhi75@163.com。
