Selenium cathodes, while attractive due to high electronic conductivity and volumetric capacity, suffer from low reactivity with lithium, volume changes, and capacity fading. This work introduces a cobalt single atom electrocatalyst in a hollow carbon cathode (CoSA-HC) to address these limitations. The CoSA-HC activates selenium reactivity and immobilizes polyselenides, leading to high discharge capacity, rate capability, and cycling stability with ~100% Coulombic efficiency. This approach opens avenues for high-power lithium-selenium batteries.

Hao Tian, Huajun Tian, Shijian Wang, Shuangming Chen, Fan Zhang, Li Song, Hao Liu, Jian Liu, Guoxiu Wang