Conductive composite binder for recyclable LiFePO_4 cathode  

作　　者：Wendi Dou Guangying Wan Tiefeng Liu Lin Han Wu Zhang Chuang Sun Rensheng Song Jianhui Zheng Yujing Liu Xinyong Tao 

机构地区：[1]College of Materials Science and Engineering,Zhejiang University of Technology,Hangzhou 310014,China [2]Department of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310058,China [3]Quzhou Institute of Power Battery and Energy Storage,Quzhou 324000,China [4]College of Environmental and Chemical Engineering,Dalian University,Dalian 116622,China

出　　处：《Chinese Chemical Letters》2024年第11期535-538,共4页中国化学快报（英文版）

基　　金：financial support by the National Key R&D Program of China(No.2022YFB2502000);National Natural Science Foundation of China(Nos.52225208,52002352,U21A20174 and 52071295);Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang(No.2020R01002)。

摘　　要：In order to solve the problem of poor conductivity of traditional LiFePO_(4)cathode binders,we developed sodium alginate-Congo red copolymers(SA-CR)as water-soluble electrically conductive and mechanically robust composite binder.Unlike most other electrically conductive polymer binders,the procedure is straightforward and low-cost to prepare SA-CR binder.Various SA-CR copolymers were prepared with different degree of compounding of CR to investigate the effect of CR on the electrochemical and physical properties of the prepared electrodes.The copolymer whose composition was filled with a mixture of SA and CR at a 3:1 mass ratio showed the best cell performance,due to the well-balanced electrical conductivity and mechanical properties.It exhibited a specific capacity of 118.8 m Ah/g at the 100th cycle with 92.1%capacity retention,significantly better than the 108.5 m Ah/g of conventional acetylene black electrodes.CR as a conduction-promoting agent in water-soluble composite binder favors the formation of continuous and homogenous conducting bridges throughout the electrode and increases the compaction density of electrode by reducing the conducting agent content of acetylene black and thus the improvement of electrode performance is realized.

关 键 词：Lithium-ion batteries LiFePO_(4)cathode Conductive binder COPOLYMER Conducting agent 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ430.7[化学工程]