Ether-compatible sulfurized polyacrylonitrile cathode with excellent performance enabled by fast kinetics via selenium doping

被引：299

作者：

Chen, Xin ^{[1
,2
]}

Peng, Linfeng ^{[1
]}

Wang, Lihui ^{[1
,2
]}

Yang, Jiaqiang ^{[2
]}

Hao, Zhangxiang ^{[2
]}

Xiang, Jingwei ^{[2
]}

Yuan, Kai ^{[2
]}

Huang, Yunhui ^{[2
]}

Shan, Bin ^{[2
]}

Yuan, Lixia ^{[2
]}

Xie, Jia ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Elect & Elect Engn, State Key Lab Adv Electromagnet Engn & Technol, Wuhan 430074, Hubei, Peoples R China

[2] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Sch Mat Sci & Engn, Wuhan 430074, Hubei, Peoples R China

来源：

NATURE COMMUNICATIONS | 2019年 / 10卷 / 1期

基金：

美国国家科学基金会;

关键词：

LI-S; LITHIUM-POLYSULFIDES; BATTERY; CARBON; COMPOSITE; MECHANISM; CONVERSION; DISCHARGE; SURFACE;

D O I：

10.1038/s41467-019-08818-6

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Sulfurized polyacrylonitrile is suggested to contain S-n (n <= 4) and shows good electrochemical performance in carbonate electrolytes for lithium sulfur batteries. However inferior results in ether electrolytes suggest that high solubility of Li2Sn (n <= 4) trumps the limited redox conversion, leading to dissolution and shuttling. Here, we introduce a small amount of selenium in sulfurized polyacrylonitrile to accelerate the redox conversion, delivering excellent performance in both carbonate and ether electrolytes, including high reversible capacity (1300 mA h g(-1) at 0.2 A g(-1)), 84% active material utilization and high rate (capacity up to 900 mA h g(-1) at 10 A g(-1)). These cathodes can undergo 800 cycles with nearly 100% Coulombic efficiency and ultralow 0.029% capacity decay per cycle. Polysulfide dissolution is successfully suppressed by enhanced reaction kinetics. This work demonstrates an ether compatible sulfur cathode involving intermediate Li2Sn (n <= 4), attractive rate and cycling performance, and a promising solution towards applicable lithium-sulfur batteries.

引用

页数：9

共 61 条

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