Boosted Li+ transference number enabled via interfacial engineering for dendrite-free lithium metal anodes. Issue 94 (15th November 2021)

• Record Type: Journal Article
• Authors: Zeng, Ting; Yan, Yu; He, Miao; Zheng, Ruixin; Du, Dayue; Ren, Longfei; Zhou, Bo; Shu, Chaozhu
• Is Part Of: Chemical communications. Volume 57:Issue 94(2021)
• Page Start: 12687
• Page End: 12690
• Publication Date: 2021-11-15
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1039/d1cc03044b
• Languages: English
• ISSNs: 1359-7345

Abstract

Abstract : The unsaturated coordinative metal sites in ZIF-67 tend to adsorb anions in the electrolyte, thus increasing the Li + transference number. Abstract : Adverse dendritic growth destabilizes Li metal anodes (LMAs), dramatically limiting the commercial applications of Li metal batteries (LMBs). Herein, ZIF-67 with unsaturated coordinative metal sites is used to construct a protective coating to immobilize anions, which is capable of increasing the Li + transference number ( t Li + ) to mitigate the electrolyte concentration gradient in the vicinity of LMAs. In addition, the ZIF-67-based layer provides highly ordered ionic diffusion pathways, thus enabling dendrite-free Li deposition. With a considerable Li + transference number of 0.57, ZIF-67-Cu@Li symmetric cells deliver a superior long-term performance (over 1000 h), and Li–O2 full batteries with ZIF-67-Cu@Li electrodes display a high energy density of 1911.61 W h kg −1 .