Electronic Localization Derived Excellent Stability of Li Metal Anode with Ultrathin Alloy. Issue 10 (4th February 2022)

• Record Type: Journal Article
• Authors: He, Danqi; Cui, Wenjun; Liao, Xiaobin; Xie, Xianfei; Mao, Mingheng; Sang, Xiahan; Zhai, Pengcheng; Zhao, Yan; Huang, Yunhui; Zhao, Wenyu
• Is Part Of: Advanced science. Volume 9:Issue 10(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-02-04
• Subjects: electronic localization -- high capacity -- Li metal anode -- self‐smoothing effect -- ultrathin alloy; Science -- Periodicals; 505
• DOI: 10.1002/advs.202105656
• Languages: English
• ISSNs: 2198-3844

Abstract

Abstract: Lithium metal is an ideal anode for next‐generation high‐energy‐density batteries. However, lithium dendrite growth has impeded its commercial application. Herein, fabricating Li‐based ultrathin alloys with electronic localization and high surface work function via depositing Bi, Al, or Au metals on the surface of copper foil for in situ alloying with lithium is proposed. It is discovered that the electronic localization can induce self‐smoothing effect of Li ions, as a result, significantly suppressing the growth of dendritic lithium. Meanwhile, the high surface work function can effectively alleviate side reactions between the electrolyte and lithium. With the as‐obtained ultrathin alloys as anodes, excellent cycling performance is achieved. The half cells run stably after more than 120 cycles under high capacity of 4 mAh cm −2 . The S||Bi/Cu‐Li full cell delivers a specific capacity of 736 mAh g −1 after 200 cycles. This work provides a new strategy for fabricating long‐life and high‐capacity lithium batteries. Abstract : The strong localized electrons on the surface of Li‐based ultrathin alloys can attract Li nuclei, and help dissolve Li clusters into isolated Li nuclei to produce self‐smoothing effect of Li ions, realizing the flat and dense deposition of Li and significantly suppress the growth of dendritic lithium during the entire plating process.