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

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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Tian H,Tian H,Wang S,Chen S,Zhang F,Song L,Liu H,Liu J,Wang G

doi

10.1038/s41467-020-18820-y

subject

Has Abstract

pub_date

2020-10-06 00:00:00

pages

5025

issue

1

issn

2041-1723

pii

10.1038/s41467-020-18820-y

journal_volume

11

pub_type

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