An extremely high rate Li-S battery with hybrid electrolyte

JOURNAL OF ALLOYS AND COMPOUNDS

卷:845

Article

Xu, Yang-Hai^1,2  Zhang, Quan-Feng¹  Fan, Bo¹  Xue, Bai¹  Chen, Hui-Jian¹  Zhang, Xiang-Hua¹  Luo, Zhong-Kuan³  Wang, Fang³  Le Coq, David⁴  Calvez, Laurent⁴  Ma, Hong-Li⁴  Fan, Ping¹ 

[1] Shenzhen Univ, Coll Phys & Energy, Inst Thin Film Phys & Applicat, Shenzhen Key Lab Adv Thin Films & Applicat, Shenzhen 518060, Peoples R China

[2] Shenzhen Univ, Coll Optoelect Engn, Key Lab Optoelect Devices & Syst, Minist Educ & Guangdong Prov, Shenzhen 518060, Peoples R China

[3] Shenzhen Univ, Coll Chem & Environm Engn, 3688 Nanhai Ave, Shenzhen 518060, Peoples R China

[4] Univ Rennes, CNRS, ISCR, UMR 6226, FR-3504 Rennes, France

关键词: Li10SnP2S12;    Sulfide solid electrolyte;    Hybrid electrolyte;    Li-S battery;    Lithium dendrites;    Safety;   

DOI  :  10.1016/j.jallcom.2020.156261

来源: Elsevier

【 摘 要 】

Polysulfide shuttling and lithium dendrites are two major issues which hinder the development of high-performance Li-S batteries. An ideal solution is to employ hybrid electrolyte consisting of sulfide solid electrolyte (SSE) and liquid electrolyte (LE), where SSE functions as a barrier for suppressing polysulfide shuttling and lithium dendrite growth while LE works as fast Li+ transport media. In this work, Li10SnP2S12 membranes, with a ceramic-like dense structure, provide a rigid barrier for preventing polysulfide shuttling and lithium dendrite growth. Meanwhile, its high ionic conductivity of 3.33 x 10(-3) S/cm (25 degrees C), accompanied with good wetting and Li+ transport abilities of LE, renders the hybrid electrolyte system an excellent Li+ dynamic property. Consequently, the Li-S batteries fabricated with this SSE-based hybrid electrolyte system can operate at an extremely high charge/discharge rate. At a rate of 5C (7.10 mA/cm(2)), the batteries show an initial discharge capacity of 659.4 mAh/g, maintain at 471.4 mAh/g and 413.3 mAh/g after 50 and 100 cycles,showing a capacity retention of 71.53% and 62.67%, respectively. It is also proposed that a competitive mechanism exists between the electrochemical reaction and side reaction during cycling, where the electrochemical reaction dominates at high rates. (C) 2020 Elsevier B.V. All rights reserved.

【 授权许可】

Free