Issue 44, 2022

A single-ion-conducting lithium-based montmorillonite interfacial layer for stable lithium–metal batteries

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 (tLi+) of 0.85, a favorable ionic conductivity (σLi+) 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.

Graphical abstract: A single-ion-conducting lithium-based montmorillonite interfacial layer for stable lithium–metal batteries

Supplementary files

Article information

Article type
Paper
Submitted
31 Aug 2022
Accepted
04 Oct 2022
First published
24 Oct 2022

J. Mater. Chem. A, 2022,10, 23712-23721

A single-ion-conducting lithium-based montmorillonite interfacial layer for stable lithium–metal batteries

T. Zeng, Y. Yan, M. He, D. Du, X. Wen, B. Zhou and C. Shu, J. Mater. Chem. A, 2022, 10, 23712 DOI: 10.1039/D2TA06898B

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