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- Title
Reclaiming Inactive Lithium with a Triiodide/Iodide Redox Couple for Practical Lithium Metal Batteries.
- Authors
Jin, Cheng‐Bin; Zhang, Xue‐Qiang; Sheng, Ou‐Wei; Sun, Shu‐Yu; Hou, Li‐Peng; Shi, Peng; Li, Bo‐Quan; Huang, Jia‐Qi; Tao, Xin‐Yong; Zhang, Qiang
- 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 (I3−/I−) redox couple initiated by stannic iodide (SnI4) is demonstrated to reclaim inactive Li. The reduction of I3− 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 I3−, reclaiming Li ion from inactive Li. The regenerated I3− engages the further redox reactions. Furthermore, the formation of Sn mitigates the corrosion of I3− on active Li reservoir sacrificially. In working Li | LiNi0.5Co0.2Mn0.3O2 batteries, the accumulated inactive Li is significantly reclaimed by the reversible I3−/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.
- Subjects
LITHIUM cells; LITHIUM-ion batteries; TIN; OXIDATION-reduction reaction; IODIDES; ELECTRIC batteries
- Publication
Angewandte Chemie, 2021, Vol 133, Issue 42, p23172
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202110589