Citation: Taoping Huang, Xiaoman Yao, Xuanxu Chen, Minqiao Liang, Mingjin Shi, Yiwen Yang, Fei Yu, Fengxue Duan, Yifa Chen, Ya-Qian Lan. Redox and conductive covalent-organic binding agent boosts sulfur conversion kinetics in Li-S batteries[J]. Chinese Chemical Letters, ;2026, 37(9): 111414. doi: 10.1016/j.cclet.2025.111414 shu

Redox and conductive covalent-organic binding agent boosts sulfur conversion kinetics in Li-S batteries

Taoping Huang ^{a, 1} ,
Xiaoman Yao ^{a, 1} ,
Xuanxu Chen ^a ,
Minqiao Liang ^a ,
Mingjin Shi ^a ,
Yiwen Yang ^a ,
Fei Yu ^b ,
Fengxue Duan ^{a, *,} ,
Yifa Chen ^{a, *,} ,
Ya-Qian Lan ^a

a.
Guangdong Provincial Key Laboratory of Carbon Dioxide Resource Utilization, School of Chemistry, South China Normal University, Guangzhou 510006, China
b.
School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China

dfx0118@163.com

chyf927821@163.com

Received Date: 22 March 2025
Revised Date: 29 May 2025
Accepted Date: 6 June 2025
Available Online: 6 June 2025

Figures(5)

Integration of redox ability and conductivity in binder is highly desirable to maximize their functions for high-performance battery requirements. Here, a novel redox covalent organic polymer binder (TTF-COP) has been developed by in-situ polymerizing redox/conductive tetrathiafulvalene unit and adhesive thiourea unit. TTF-COP can achieve one-pot cathode fabrication and simultaneously provide strong interactions with cathodic materials, showing significantly enhanced mechanical strength of the electrode, accelerated capture/conversion of lithium polysulfides (LiPSs), about 10,000 times higher viscosity (at shear rates of 0.1–1 s^-1), and about 200 times enhanced electrical conductivity than that of PVDF. TTF-COP based cells exhibit high initial capacity (1126 mAh/g at 0.5 C, 928 mAh/g at 1 C, 611 mAh/g at 5 C, respectively) and excellent cycling stability over 800 cycles at 5 C (0.089% decay per cycle). Moreover, the cell shows an excellent specific capacity of 5.1 mAh/cm² under a high sulfur loading of 7.1 mg/cm² and low E/S ratio of 10.7 µL/mg. This work provides a new reference for designing multifunctional binders, hoping to enrich the binding chemistry for sustainable battery targets.
- Tetrathiafulvalene,
- Binder,
- Redox ability,
- Conductivity,
- Li-S battery
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