MoO3/MoS2 flexible paper as sulfur cathode with synergistic suppress shuttle effect for lithium-sulfur batteries. (20th June 2022)

• Record Type: Journal Article
• Authors: Yang, Jie; Qu, Yuanduo; Lin, Xiuhua; Wang, Liying; Zheng, Zihan; Zhuang, Jian; Duan, Lianfeng
• Is Part Of: Electrochimica acta. Volume 418(2022)
• Publication Date: 2022-06-20
• Subjects: Transition oxide composite -- Flexible paper electrode -- 2D materials -- Catalytic activity -- Shuttle effect -- Lithium-sulfur battery; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2022.140378
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: A novel MoO3 HI@MoS2 paper has been prepared as a flexible Li-S battery cathode. Preparation of hydrogen ion intercalation three-dimensional nanostructure via simple method. Synergistic inhibition of shuttle effect by active catalysis and passive adsorption. Composite cathode without current collector achieved a capacity of 911.3 m ah g − 1 after 500 cycles. Abstract: Lithium-sulfur (Li-S) batteries have become one of the most promising candidate systems for electronic energy storage applications. However, the shuttle effect, which is caused by the intermediate lithium polysulfide (LiPs) dissolving in the electrolyte and commuting between electrodes, is the main factor leading to the deterioration of the electrochemical performance of the Li-S batteries. Different from most single physical confinement or chemical adsorption, we report a hydrogen ion intercalated molybdenum trioxide (MoO3 -HI) with embedded molybdenum disulfide (MoS2 ) flexible paper as S hosts not only restricted soluble LiPs passively with physical adsorption, but also accelerate actively the transformation rate of polysulfides with strong chemical affinity and catalytic activity. Furthermore, the theoretical calculation showed that the MoO3 -HI/MoS2 equipped the ability of directly convert S8 molecules into LiS2 molecules, eliminating the formation of lithium polysulfide. Based on the new strategy of synergistic suppress shuttle effect, the Li-S battery with MoO3 -HI/MoS2 /S cathode achieved a capacity of 911.3 mAh g − 1 after 500 cycles with outstanding cycle stability. In addition, MoO3 -HI/MoS2 paper as a flexible carrier for Li-S batteries can be folded repeatedly and keep the structure intact. Hence, the current work provides a novel paper electrode with active and passive dual synergistic inhibition of shuttle effect characteristics for high performance flexible lithium-sulfur batteries. Graphical abstract: A novel MoO3 HI@MoS2 with unique three-dimensional network and strong catalytic activity, which can simplify the multi electron process of polysulfides and dual synergistic inhibit the shuttle effect under the cooperation of active catalysis and passive adsorption. Image, graphical abstract