Metallically conductive TiB2 as a multi-functional separator modifier for improved lithium sulfur batteries

JOURNAL OF POWER SOURCES

卷:448

Article

Jin, Liming^1,2,3,4,5  Ni, Jie^2,3  Shen, Chao^4,5  Peng, Fenglai⁸  Wu, Qiang^4,5  Ye, Donghao^4,5  Zheng, Junsheng^2,3  Li, Gaoran⁶  Zhang, Cunman^2,3  Li, Zhoupeng^1,7  Zheng, Jim P.^2,3,4,5 

[1] Zhejiang Univ, Dept Chem & Biol Engn, Hangzhou 310027, Peoples R China

[2] Tongji Univ, Clean Energy Automot Engn Ctr, Shanghai 201804, Peoples R China

[3] Tongji Univ, Sch Automot Studies, Shanghai 201804, Peoples R China

[4] Florida State Univ, Aeropropuls Mechatron & Energy Ctr, Tallahassee, FL 32310 USA

[5] Florida State Univ, Florida A&M Univ, Coll Engn, Dept Elect & Comp Engn, Tallahassee, FL 32310 USA

[6] Univ Waterloo, Dept Chem Engn, Waterloo, ON N2L 3G1, Canada

[7] Zhejiang Univ, Ningbo Res Inst, Ningbo 315100, Peoples R China

[8] Shanghai Motor Vehicle Inspect Certificat & Tech, Shanghai 201805, Peoples R China

关键词: TiB2;    High conductivity;    Multi-functional separator;    Lithium sulfur battery;   

DOI  :  10.1016/j.jpowsour.2019.227336

来源: Elsevier

【 摘 要 】

A metallically conductive TiB2 is developed to construct multifunctional separator toward improved lithium-sulfur (Li-S) battery performance. Coupled with two-dimensional graphene, the obtained TiB2@G separator fulfills a synergistic combination of strong physical and chemical sulfur immobilization as well as a high-efficiency sulfur reutilization, thus establishing a robust barrier against the polysulfide shuttling and enabling a fast and durable sulfur electrochemistry. As a result, cells based on TiB2@G separator exhibit a high sulfur utilization with 1350 mA h g(-1) capacity at 0.05C, superb rate capability up to 5.0C, and excellent cyclability with a high capacity retention over 85% after 300 cycles at 0.5C. Moreover, significantly mitigated self-discharge and considerably high areal capacity of 5.8 mA h cm(-2) can be also achieved, indicating the great promise of this separator design for the development of high-performance Li-S batteries.

【 授权许可】

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