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Liu, Fang; Sun, Geng; Wu, Hao Bin; Chen, Gen; Xu, Duo; Mo, Runwei; Shen, Li; Li, Xianyang; Ma, Shengxiang; Tao, Ran; Li, Xinru; Tan, Xinyi; Xu, Bin; Wang, Ge; Dunn, Bruce S.; Sautet, Philippe; Lu, Yunfeng
Nature communications, 10/2020, Volume: 11, Issue: 1Journal Article
Abstract The sluggish electrochemical kinetics of sulfur species has impeded the wide adoption of lithium-sulfur battery, which is one of the most promising candidates for next-generation energy storage system. Here, we present the electronic and geometric structures of all possible sulfur species and construct an electronic energy diagram to unveil their reaction pathways in batteries, as well as the molecular origin of their sluggish kinetics. By decoupling the contradictory requirements of accelerating charging and discharging processes, we select two pseudocapacitive oxides as electron-ion source and drain to enable the efficient transport of electron/Li + to and from sulfur intermediates respectively. After incorporating dual oxides, the electrochemical kinetics of sulfur cathode is significantly accelerated. This strategy, which couples a fast-electrochemical reaction with a spontaneous chemical reaction to bypass a slow-electrochemical reaction pathway, offers a solution to accelerate an electrochemical reaction, providing new perspectives for the development of high-energy battery systems.
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