In:
Angewandte Chemie, Wiley, Vol. 133, No. 42 ( 2021-10-11), p. 23172-23177
Abstract:
High‐energy‐density lithium (Li) metal batteries suffer from a short lifespan owing to apparently ceaseless inactive Li accumulation, which is accompanied by the consumption of electrolyte and active Li reservoir, seriously deteriorating the cyclability of batteries. Herein, a triiodide/iodide (I 3 − /I − ) redox couple initiated by stannic iodide (SnI 4 ) is demonstrated to reclaim inactive Li. The reduction of I 3 − converts inactive Li into soluble LiI, which then diffuses to the cathode side. The oxidation of LiI by the delithiated cathode transforms cathode into the lithiation state and regenerates I 3 − , reclaiming Li ion from inactive Li. The regenerated I 3 − engages the further redox reactions. Furthermore, the formation of Sn mitigates the corrosion of I 3 − on active Li reservoir sacrificially. In working Li | LiNi 0.5 Co 0.2 Mn 0.3 O 2 batteries, the accumulated inactive Li is significantly reclaimed by the reversible I 3 − /I − redox couple, improving the lifespan of batteries by twice. This work initiates a creative solution to reclaim inactive Li for prolonging the lifespan of practical Li metal batteries.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v133.42
DOI:
10.1002/ange.202110589
Language:
English
Publisher:
Wiley
Publication Date:
2021
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