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材料导报  2022, Vol. 36 Issue (22): 21080285-6    https://doi.org/10.11896/cldb.21080285
  无机非金属及其复合材料 |
聚丙烯腈分子量对锂硫电池比容量和循环稳定性的影响
魏士俊1, 何润合1, 李永兵1, 靳艳梅1, 张兴祥1,2,*
1 天津工业大学材料科学与工程学院,天津 300387
2 天津市先进纤维与储能技术重点实验室,天津 300387
Effect of Molecular Weight of Polyacrylonitrile on Specific Capacity and Cycle Performance of Lithium-Sulfur Battery
WEI Shijun1, HE Runhe1, LI Yongbing1, JIN Yanmei1, ZHANG Xingxiang1,2,*
1 School of Material Science and Engineering, Tiangong University, Tianjin 300387, China
2 Tianjin Municipal Key Lab of Advanced Fiber and Energy Storage Technology, Tianjin 300387, China
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摘要 采用自由基聚合法,以丙烯腈(AN)为原料,以不同质量比的水(H2O)与二甲基亚砜(DMSO)的混合试剂为介质,制备不同分子量的聚丙烯腈(VMPAN)。随后采用升华硫(S)作为硫源,制备硫化聚丙烯腈(SPAN),探究了不同H2O与DMSO配比对PAN的理化性能以及PAN作为锂-硫电池正极时的电化学性能的影响。研究结果表明,混合试剂配比为50:50的VMPAN具有适中的分子量,用其制备出的SPAN复合材料展现出最佳性能,载硫量近52%(质量分数),锂离子扩散系数可达1.06×10-12 cm2·s-1,在0.2C和1.0C下初始放电比容量分别达到1 805.48 mAh·g-1与1 704.22 mAh·g-1。在0.2C下循环100次后正极材料可逆比容量为1 225 mAh·g-1,容量保持率高达85%,具有优异的循环性能与倍率性能。
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魏士俊
何润合
李永兵
靳艳梅
张兴祥
关键词:  锂硫电池  硫化聚丙烯腈  分子量  比容量  正极    
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
出版日期:  2022-11-25      发布日期:  2022-11-25
ZTFLH:  TM912  
基金资助: 天津市新材料重大专项(16ZXCLGX00090);国家重点研发计划项目(2016YFB0303000)
通讯作者:  * zhangpolyu@aliyun.com   
作者简介:  魏士俊,于2018年6月获得天津工业大学化学工程与工艺专业学士学位,现为天津工业大学材料与科学工程学院硕士研究生,师从张兴祥教授。目前研究方向主要为锂硫电池正极材料的结构设计与性能分析。
张兴祥,天津工业大学教授、博士研究生导师,2005年博士毕业于中国香港理工大学纺织与应用科学学院。主要从事智能材料与功能材料研究。在国内外重要期刊发表文章200余篇,授权国家发明专利32项。
引用本文:    
魏士俊, 何润合, 李永兵, 靳艳梅, 张兴祥. 聚丙烯腈分子量对锂硫电池比容量和循环稳定性的影响[J]. 材料导报, 2022, 36(22): 21080285-6.
WEI Shijun, HE Runhe, LI Yongbing, JIN Yanmei, ZHANG Xingxiang. Effect of Molecular Weight of Polyacrylonitrile on Specific Capacity and Cycle Performance of Lithium-Sulfur Battery. Materials Reports, 2022, 36(22): 21080285-6.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.21080285  或          http://www.mater-rep.com/CN/Y2022/V36/I22/21080285
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