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Abbas, Syed Ali; Chen, Hsin‐An; Mohapatra, Anisha; Singh, Anupriya; Li, Shenghan; Pao, Chun‐Wei; Chu, Chih Wei
Small (Weinheim an der Bergstrasse, Germany), 07/2022, Volume: 18, Issue: 27Journal Article
The notorious growth of lithium (Li) dendrites and the instability of the solid electrolyte interface (SEI) during cycling make Li metal anodes unsuitable for use in commercial Li‐ion batteries. Herein, the use of simple sugar coating (α‐d‐glucose) is demonstrated on top of Li metal to halt the growth of Li dendrites and stabilize the SEI. The α‐d‐glucose layer possesses high surface and adhesive energies toward Li, which promote the homogenous stripping and plating of Li ions on top of the Li metal. Density functional theory reveals that Li‐ion diffusion within the α‐d‐glucose layer is governed by hopping around the bare sides of the O atoms and along the apparent passages formed by the glucose molecules. Stable cycling performance is achieved when combining α‐d‐glucose–coated Li (G|Li) anodes with sulfur‐ and LiFePO4‐based cathodes in both LiTFSI (ether) and LiPF6 (carbonate) electrolyte systems. A G|Li–based symmetrical cell operates at a current density of 1 mA cm−2 and areal capacity of 1 mAh cm−2 displays a stable overpotential profile for over 9 months (7000 h) of continuous charge/discharge cycling. Inhibition of lithium dendrites is achieved by a simple strategy of coating an α‐d‐glucose layer on top of lithium metal. The α‐d‐glucose possessing high surface and adhesive energy with lithium can promote uniform deposition and stripping of Li‐ions and significantly enhance the cycle life of symmetrical and full cells in both ether and carbonate‐based electrolyte systems.
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