Aqueous-processable polymer binder with strong mechanical and polysulfide-trapping properties for high performance of lithium-sulfur batteries

被引:67
作者
Yi, Huan [1 ,2 ]
Lan, Tu [3 ,4 ]
Yang, Yu [2 ,5 ]
Lei, Zhiwen [1 ]
Zeng, Hongbo [3 ]
Tang, Tian [4 ]
Wang, Chaoyang [1 ]
Deng, Yonghong [2 ]
机构
[1] South China Univ Technol, Res Inst Mat Sci, Guangzhou 510640, Guangdong, Peoples R China
[2] Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
[3] Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 1H9, Canada
[4] Univ Alberta, Dept Mech Engn, Edmonton, AB T6G 1H9, Canada
[5] South Univ Sci & Technol China, Acad Adv Interdisciplinary Studies, Shenzhen, Peoples R China
基金
加拿大自然科学与工程研究理事会; 中国国家自然科学基金;
关键词
SILICON ANODES; CHITOSAN; CAPABILITY; CATHODES; GUM;
D O I
10.1039/c8ta07194b
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Lithium-sulfur batteries (LSBs) are regarded as the next-generation high-performance energy storage devices due to their high energy density. However, the long-term use of LSBs in practical applications is limited by the shuttle effect resulting from the diffusion of lithium polysulfides (LiPS) in electrolyte. To address these challenges, a novel aqueous-processable polymer with multiple functional groups, catechol-conjugated chitosan sulfate (CCS), is developed as the binder of the sulfur cathode. The CCS binder demonstrates strong adsorption capability to trap LiPS, as evidenced by ultraviolet-visible (UV-vis) spectra and density functional theory (DFT) calculations. Its excellent mechanical and binding properties also result in stabilization of sulfur cathodes in long-term cycling. LSBs assembled with CCS exhibit remarkable improvement in cycling performance with high capacity retention of 80.14% after 400 cycles at 0.5C, and the electrodes maintain their integrity without any clear cracks. At a high rate of 2C, the LSBs can still maintain 77.30% capacity after 300 cycles with high coulombic efficiency of 99.37%. Our results provide new insights into the significance of sulfate and catechol groups in CCS binder for sulfur cathode and pave a new way for the tailoring of the chemical structures of natural polymers to realize LSBs with superior electrochemical performance.
引用
收藏
页码:18660 / 18668
页数:9
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