期刊
NANO LETTERS
卷 16, 期 1, 页码 519-527出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b04166
关键词
Lithium-sulfur batteries; polysulfide; redox reaction; cathode; carbon
类别
资金
- Natural Scientific Foundation of China [21306103, 21422604, 21561130151]
- National Basic Research Program of China [2015CB932500]
- Tsinghua University Initiative Scientific Research Program [2014z22076]
- Tsinghua National Laboratory for Information Science and Technology
Lithium sulfur (Li-S) battery system is endowed with tremendous energy density, resulting from the complex sulfur electrochemistry involving multielectron redox reactions and phase transformations. Originated from the slow redox kinetics of polysulfide intermediates, the flood of polysulfides in the batteries during cycling induced low sulfur utilization, severe polarization, low energy efficiency, deteriorated polysulfide shuttle, and short cycling life. Herein, sulfiphilic cobalt disulfide (CoS2) was incorporated into carbon/sulfur cathodes, introducing strong interaction between lithium polysulfides and CoS2 under working conditions. The interfaces between CoS2 and electrolyte served as strong adsorption and activation sites for polar polysulfides and therefore accelerated redox reactions of polysulfides. The high polysulfide reactivity not only guaranteed effective polarization mitigation and promoted energy efficiency by 10% but also promised high discharge capacity and stable cycling performance during 2000 cycles. A slow capacity decay rate of 0.034%/cycle at 2.0 C and a high initial capacity of 1368 mAh g(-1) at 0.5 C were achieved. Since the propelling redox reaction is not limited to Li-S system, we foresee the reported strategy herein can be applied in other high-power devices through the systems with controllable redox reactions.
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