A single-ion-conducting lithium-based montmorillonite interfacial layer for stable lithium–metal batteries. Issue 44 (24th October 2022)

• Record Type: Journal Article
• Authors: Zeng, Ting; Yan, Yu; He, Miao; Du, Dayue; Wen, Xiaojuan; Zhou, Bo; Shu, Chaozhu
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 44(2022)
• Page Start: 23712
• Page End: 23721
• Publication Date: 2022-10-24
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta06898b
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A Li-MMT protective layer with high modulus, a high Li + transference number of 0.85 and a considerable ionic conductivity of 5.77 × 10 −4 S cm −1 can promote dendrite-free Li deposition and improve cycling stability over 1300 h for Li metal anodes. Abstract : Constructing a robust interfacial layer on lithium metal anodes (LMAs) to inhibit dendrite growth is vital in the pursuit of high-energy density lithium metal batteries (LMBs). Here, lithium-based montmorillonite (Li-MMT) is fabricated as an artificial protective layer to suppress dendritic Li deposition. The Li-MMT layer can not only act as a Li + ion reservoir but also as a single Li + ion conductor, enhancing Li + ion transport kinetics and alleviating the interfacial Li + ion concentration gradient. Theoretical calculations confirm that Li-MMT can immobilize TFSI − ions and allow fast Li + ion shuttle with a low migration energy barrier of 0.28 eV. Finite element method (FEM) simulations further demonstrate the effective modulation of the Li-MMT layer for Li plating behavior, leading to a high Li + transference number ( t Li + ) of 0.85, a favorable ionic conductivity ( σ Li + ) of 5.77 × 10 −4 S cm −1 and an extended Li plating/stripping stability over 1300 h. Consequently, excellent cycling performance (206 cycles) with remarkably improved energy density is realized for lithium–oxygen (Li–O2 ) full batteries based on Li-MMT–Cu@Li electrodes.