High-Efficiency Polysulfide Trapping with g-C 3 N 4 /CNT Hybrids for Superior Lithium-Sulfur Batteries

Zhen Chen (), Hao Meng, Jiayi Wang (), Lin Yang, Xin Wang and Zhongwei Chen ()
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Zhen Chen: Institute of Carbon Neutrality, Zhejiang Wanli University, Ningbo 315100, China
Hao Meng: Institute of Carbon Neutrality, Zhejiang Wanli University, Ningbo 315100, China
Jiayi Wang: Institute of Carbon Neutrality, Zhejiang Wanli University, Ningbo 315100, China
Lin Yang: Institute of Carbon Neutrality, Zhejiang Wanli University, Ningbo 315100, China
Xin Wang: Institute of Carbon Neutrality, Zhejiang Wanli University, Ningbo 315100, China
Zhongwei Chen: Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China

Energies, 2025, vol. 18, issue 17, 1-14

Abstract: Commercialization of lithium-sulfur (Li-S) batteries is critically hampered by the severe lithium polysulfide shuttle effect. Hence, designing multifunctional materials that synergistically provide physical confinement of polysulfides, chemical entrapment, and catalytic promotion is a viable route for improving Li-S battery performance. Herein, graphitic carbon nitride (g-C 3 N 4 ) with abundant nitrogen atoms was used as the chemical adsorption material to realize a “physical-chemical” dual confinement for polysulfides. Furthermore, the integration of CNTs with g-C 3 N 4 is intended to substantially enhance the conductivity of the cathode material. Consequently, the synthesized g-C 3 N 4 /CNT composite, which functions as an effective polysulfide immobilizer, significantly improved the cycling stability and discharge capacity of Li-S batteries. This enhancement can be attributed to its potent adsorption and catalytic activities. Li-S cells utilizing g-C 3 N 4 /CNT cathodes exhibit exceptional discharge capacity and notable rate capability. Specifically, after 100 cycles at 0.2 C, the discharge capacity was 701 mAh g −1 . Furthermore, even at a high rate of 2 C, a substantial capacity of 457 mAh g −1 was retained.

Keywords: g-C 3 N 4 /CNT cathode; three-dimensional hierarchical; Li-S battery; cathode (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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