Synthesis of CoP@B,N,P co-doped porous carbon by a supramolecular gel self-assembly method for lithium-sulfur battery separator modification

Zhenpu Shi; Yunqi Huang; Juhong Xu; Yudong Pang; Lan Wang; Wanli Zhao; Hongyun Yue; Zongxian Yang; Shuting Yang; Yanhong Yin

doi:10.1039/d3dt01132a

Synthesis of CoP@B,N,P co-doped porous carbon by a supramolecular gel self-assembly method for lithium-sulfur battery separator modification

Dalton Trans. 2023 Jun 20;52(24):8284-8293. doi: 10.1039/d3dt01132a.

Authors

Zhenpu Shi^{1

2}, Yunqi Huang¹, Juhong Xu¹, Yudong Pang³, Lan Wang¹, Wanli Zhao^{1

2}, Hongyun Yue^{1

2}, Zongxian Yang³, Shuting Yang^{1

2}, Yanhong Yin^{1

2}

Affiliations

¹ School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China. shutingyang@foxmail.com.
² National and Local Joint Engineering Laboratory of Motive Power and Key Materials, Xinxiang, Henan 453007, China.
³ School of Physics, Henan Normal University, Xinxiang, Henan 453007, China.

PMID: 37254965
DOI: 10.1039/d3dt01132a

Abstract

Lithium-sulfur batteries (LSBs) are regarded as promising next-generation batteries due to their high abundance and high theoretical energy density. However, the commercial application of LSBs is hindered by the shuttle effect of soluble lithium polysulfides (LiPSs). Hence, we synthesised B, N, P co-doped three-dimensional hierarchical porous carbon materials, uniformly dispersed with CoP nanoparticles, and utilized them as the coating material for the PE separator. The catalytic and adsorption capacity of the composite material was significantly enhanced by CoP. Both experimental and theoretical calculations show that the LiPS adsorption capacity of the composite material is significantly enhanced after the introduction of B atoms. As a result, the assembled LSBs with the CoP@BNPC/PE separator show excellent long-term stability (940.8 mA h g^-1 after 500 cycles at 1.0 C, and only a 0.026% decay rate per cycle) and superior rate performance (613.6 mA h g^-1 at 5.0 C). Our work further proves that a modified separator is an effective strategy to promote the commercialization of LSBs.