Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 4, Pages 3707-3713Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b18645
Keywords
lithium-sulfur batteries; polysulfide; reduced graphene oxide; MoS2; interlayer
Funding
- National Science and Technology Support Program of China [2015BAB06B00]
- strategic emerging industry science and technology research project of Hunan Province, China [2016GK4029]
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The further development of lithium-sulfur (Li-S) batteries is limited by the fact that the soluble polysulfide leads to the shuttle effect, thereby reducing the cycle stability and cycle life of the batteries. To address this issue, here a thin and lightweight (8 mu m and 0.24 mg cm(-2)) reduced graphene oxide@MoS2 (rGO@MoS2) interlayer between the cathode and the commercial separator is developed as a polysulfide barrier. The rGO plays the roles of both a polysulfide physical barrier and an additional current collector, while MoS2 has a high chemical adsorption for polysulfides. The experiments demonstrate that the Li-S cell constructed with an rGO@MoS2-coated separator shows a high reversible capacity of 1122 mAh g(-1) at 0.2 C, a low capacity fading rate of 0.116% for 500 cycles at 1 C, and an outstanding rate performance (615 mAh g(-1) at 2 C). Such an interlayer is expected to be ideal for lithium-sulfur battery applications because of its excellent electrochemical performance and simple synthesis process.
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