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Electrocatalytic and stoichiometric reactivity of 2d layered siloxene for high-energy-dense lithium-sulfur batteries

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Carbon Energy 2021年第6期3卷 976-990页

作者： Hui-Ju Kang Jae-Woo Park Hyun Jin Hwang Heejin Kim Kwang-Suk Jang Xiulei Ji Hae Jin Kim Won Bin Im Young-Si Jun department of Advanced Chemicals&Engineering Chonnam National UniversityGwangjuRepublic of Korea division of Analytical Science Korea Basic Science Institute(KBSI)DaejeonRepublic of Korea department of Applied Chemistry Hanyang UniversityAnsanGyeonggi-doRepublic of Korea department of Chemistry Oregon State UniversityCorvallisOregonUSA division of Materials Science and Engineering Hanyang UniversitySeoulRepublic of Korea

Lithium-sulfur batteries(LSBs)have emerged as promising power sources for high-performance devices such as electric ***,the poor energy density of LSBs owing to polysulfide shuttling and passivation has limited their further market *** mitigate this challenge,two-dimensional(2d)siloxene(2dSi),a Si-based analog of graphene,is utilized as an additive for sulfur *** 2dSi is fabricated on a large scale by simple solvent extraction of calcium disilicide to form a thin-layered structure of Si planes functionalized with vertically aligned hydroxyl groups in the *** stoichiometric reaction of 2dSi with polysulfides generates a thiosulfate redox mediator,secures the intercalation pathway,and reveals Lewis acidic sites within the siloxene *** 2dSi utilizes the corresponding in-situ-formed electrocatalyst,the 2d confinement effect of the layered structure,and the surface affinity based on Lewis acid-base interaction to improve the energy density of 2dSi-based LSB *** with the commercial carbon-based current collector,2dSi-based LSB cells achieve a volumetric energy density of 612 Wh Lcell^(−1) at 1 mA cm^(−2) with minor degradation of 0.17%per cycle,which rivals those of state-of-the-art *** study presents a method for the industrial production of high-energy-dense LSBs.

关键词： 2d confinement effects Lewis acid-base interactions lithium-sulfur batteries siloxenes thiosulfate-polythionate redox couple

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