聚丙烯腈分子量对锂硫电池比容量和循环稳定性的影响

doi:10.11896/cldb.21080285

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Abstract Free radical polymerization of acrylonitrile (AN) in the mixed solvent of water (H₂O) and dimethyl sulfoxide (DMSO) with different mass ra-tios is used to fabricate polyacrylonitrile with various molecular weights (VMPAN). Furthermore, sulfurized polyacrylonitrile (SPAN) was fabricated using sublimated sulfur as the sulfur source. The influence of various H₂O and DMSO ratios on the chemical and physical properties of VMPAN and the electrochemical performance of SPAN as the positive electrode of lithium-sulfur battery were investigated. The results show that the PAN with a mixed reagent ratio of 50:50 has a moderate molecular weight, and its derived SPAN composite material exhibits the best performance. The sulfur loading and the lithium-ion diffusion coefficient were nearly 52wt% and 1.06×10^-12 cm²·s^-1, respectively. The initial discharge specific capacities of SPAN cathode material at 0.2C and 1.0C were 1 805.48 mAh·g^-1 and 1 704.22 mAh·g^-1, respectively. After 100 cycles at 0.2C, the reversible specific capacity was 1 225 mAh·g^-1. Meanwhile, the capacity retention rate is as high as 85%, and it has excellent cycle performance and rate performance.

Key words： lithium-sulfur battery sulfurized polyacrylonitrile (SPAN) molecular weight specific capacity positive electrode

Published: 25 November 2022 Online: 2022-11-25

CLC number:

TM912

Fund:New Materials Research Key Program of Tianjin (16ZXCLGX00090) and the National Key Research and Development Program of China (2016YFB0303000).

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	Articles by authors
	WEI Shijun
	HE Runhe
	LI Yongbing
	JIN Yanmei
	ZHANG Xingxiang

Cite this article:

WEI Shijun,HE Runhe,LI Yongbing, et al. Effect of Molecular Weight of Polyacrylonitrile on Specific Capacity and Cycle Performance of Lithium-Sulfur Battery[J]. Materials Reports, 2022, 36(22): 21080285-6.

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http://www.mater-rep.com/EN/10.11896/cldb.21080285 OR http://www.mater-rep.com/EN/Y2022/V36/I22/21080285

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