纤维素纳米片辅助的高导电厚电极的成膜工艺研究  

Nanosheet cellulose-assisted solution processing of highly conductive and high loading thick electrode for lithium-ion batteries

作　　者：杜治辰 王汉伟 符金洲 翟春 孙庆丰 翟天佑 李会巧 Zhichen Du;Hanwei Wang;Jinzhou Fu;Chun Zhai;Qingfeng Sun;Tianyou Zhai;Huiqiao Li(State Key Laboratory of Materials Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology(HUST),Wuhan 430074,China;School of Engineering,Zhejiang A&F University,Hangzhou 311300,China;School of Materials Engineering,Changshu Institute of Technology,Changshu 215500,China;Shenzhen Research Institute of Huazhong University of Science and Technology,Shenzhen 518063,China)

机构地区：[1]State Key Laboratory of Materials Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology(HUST),Wuhan 430074,China [2]School of Engineering,Zhejiang A&F University,Hangzhou 311300,China [3]School of Materials Engineering,Changshu Institute of Technology,Changshu 215500,China [4]Shenzhen Research Institute of Huazhong University of Science and Technology,Shenzhen 518063,China

出　　处：《Science China Materials》2024年第2期672-679,共8页中国科学（材料科学）（英文版）

基　　金：supported by the National Natural Science Foundation of China(U22A20140,52072138);Shenzhen Science and Technology Program(JCYJ20220818100418040 and JCYJ20220530160816038)。

摘　　要：厚电极技术能在不改变电池内部物质/组分/系统配置的情况下,有效提高电池能量密度,因此备受业界关注.然而,缓慢的电荷转移动力学和较差的机械稳定性,阻碍了其实际应用.在此,我们提出了一种由纤维素纳米片辅助的湿法制膜工艺实现了高导电、高负载厚电极的制备.二维结构纤维素纳米片的高表面积、丰富的官能团和优异的机械性能等独特的性质可以促使电极中的导电剂均匀分布,从而在电极内部构建一个三维连续的快速导电网络,同时纤维素片的存在赋予电极良好的力学性能,厚度提升到300μm而不开裂.以此制得的LiCoO_(2)厚电极在50 mg cm-2的高质量负载下循环,可以实现比干电极高6倍的容量保持率.Thick electrode technology has attracted much attention of the industry as an effective and practical way to achieve high energy density of batteries,since it just needs to increase the mass loading of electrode per unit area with no changes in battery system.However,with the increase of the thickness and the mass loading of the electrode,the electrode films are more susceptible to cracking due to stress concentration.Besides,the ionic conductivity and electronic conductivity inside the electrode decrease significantly.Herein,we propose a nanosheet cellulose-assisted solution processing of highly conductive and high loading thick electrode for lithium-ion battery.With the help of two-dimensional celluloses that possess high surface area,rich functional groups and outstanding mechanical properties,we can homogenize the distribution of conductive agents and construct a robust network to wrap the active materials,so that the LiCoO_(2) thick electrode obtained can achieve a high mass loading of 50 mg cm−2 and a capacity retention rate six times higher than that of the dry electrode after 50 cycles.

关 键 词：lithium-ion batteries thick electrode nanosheet cellulose solution process 

分 类 号：TB383.2[一般工业技术—材料科学与工程] O646.54[理学—物理化学]