Citation: Wendi Dou, Guangying Wan, Tiefeng Liu, Lin Han, Wu Zhang, Chuang Sun, Rensheng Song, Jianhui Zheng, Yujing Liu, Xinyong Tao. Conductive composite binder for recyclable LiFePO₄ cathode[J]. Chinese Chemical Letters, ;2024, 35(11): 109389. doi: 10.1016/j.cclet.2023.109389 shu

Conductive composite binder for recyclable LiFePO₄ cathode

Wendi Dou ^{a, 1} ,
Guangying Wan ^{a, 1} ,
Tiefeng Liu ^{b, *,} ,
Lin Han ^a ,
Wu Zhang ^a ,
Chuang Sun ^b ,
Rensheng Song ^d ,
Jianhui Zheng ^{c, *,} ,
Yujing Liu ^{a, *,} ,
Xinyong Tao ^{a, *,}

a.
College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
b.
Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China
c.
Quzhou Institute of Power Battery and Energy Storage, Quzhou 324000, China
d.
College of Environmental and Chemical Engineering, Dalian University, Dalian 116622, China

tiefengliu@zju.edu.cn

zhengjianhui@qzpowerbattery.com

yujingliu@zjut.edu.cn

tao@zjut.edu.cn

Received Date: 29 August 2023
Revised Date: 7 September 2023
Accepted Date: 4 December 2023
Available Online: 12 December 2023

Figures(4)

In order to solve the problem of poor conductivity of traditional LiFePO₄ 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 mAh/g at the 100th cycle with 92.1% capacity retention, significantly better than the 108.5 mAh/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.
- Lithium-ion batteries,
- LiFePO₄ cathode,
- Conductive binder,
- Copolymer,
- Conducting agent
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沈阳化工大学材料科学与工程学院沈阳 110142

Conductive composite binder for recyclable LiFePO4 cathode

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通讯作者: 陈斌, bchen63@163.com

Conductive composite binder for recyclable LiFePO₄ cathode