Dual redox mediators accelerate the electrochemical kinetics of lithium-sulfur batteries

Fang Liu, Geng Sun, Hao Bin Wu, Gen Chen, Duo Xu, Runwei Mo, Li Shen, Xianyang Li, Shengxiang Ma, Ran Tao, Xinru Li, Xinyi Tan, Bin Xu, Ge Wang (), Bruce S. Dunn (), Philippe Sautet () and Yunfeng Lu ()
Additional contact information
Fang Liu: University of California
Geng Sun: University of California
Hao Bin Wu: University of California
Gen Chen: University of California
Duo Xu: University of California
Runwei Mo: University of California
Li Shen: University of California
Xianyang Li: University of California
Shengxiang Ma: University of California
Ran Tao: University of California
Xinru Li: University of California
Xinyi Tan: University of California
Bin Xu: Jilin University
Ge Wang: University of Science and Technology Beijing
Bruce S. Dunn: University of California
Philippe Sautet: University of California
Yunfeng Lu: University of California

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-19070-8

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