High-power lithium–selenium batteries enabled by atomic cobalt electrocatalyst in hollow carbon cathode

Hao Tian, Huajun Tian, Shijian Wang, Shuangming Chen, Fan Zhang, Li Song (), Hao Liu (), Jian Liu () and Guoxiu Wang ()
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Hao Tian: University of Technology Sydney
Huajun Tian: University of Technology Sydney
Shijian Wang: University of Technology Sydney
Shuangming Chen: University of Science and Technology of China
Fan Zhang: University of Technology Sydney
Li Song: University of Science and Technology of China
Hao Liu: University of Technology Sydney
Jian Liu: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Guoxiu Wang: University of Technology Sydney

Nature Communications, 2020, vol. 11, issue 1, 1-12

Abstract: Abstract Selenium cathodes have attracted considerable attention due to high electronic conductivity and volumetric capacity comparable to sulphur cathodes. However, practical development of lithium-selenium batteries has been hindered by the low selenium reaction activity with lithium, high volume changes and rapid capacity fading caused by the shuttle effect of polyselenides. Recently, single atom catalysts have attracted extensive interests in electrochemical energy conversion and storage because of unique electronic and structural properties, maximum atom-utilization efficiency, and outstanding catalytic performances. In this work, we developed a facile route to synthesize cobalt single atoms/nitrogen-doped hollow porous carbon (CoSA-HC). The cobalt single atoms can activate selenium reactivity and immobilize selenium and polyselenides. The as-prepared selenium-carbon (Se@CoSA-HC) cathodes deliver a high discharge capacity, a superior rate capability, and excellent cycling stability with a Coulombic efficiency of ~100%. This work could open an avenue for achieving long cycle life and high-power lithium-selenium batteries.

Date: 2020
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DOI: 10.1038/s41467-020-18820-y

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