Dendrite‐Free Li Metal Anodes and the Formation of Plating Textures with a High Transference Number Modified Separator

The application of Li metal anodes is currently hindered by the uncontrolled growth of Li dendrites. Herein, the effects of a modified separator with a high Li+ transference number (t+) on the structure and electrochemical performance of Li metal anodes are reported. Stable and dendrite‐free plating...

Full description

Saved in:
Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2021-09, Vol.17 (36), p.e2101881-n/a
Main Authors: Li, Xuting, Ye, Jiajia, Fu, Zhanghua, Xia, Guang, Chen, Chuanzhong, Hu, Cheng
Format: Article
Language:English
Subjects:
Anodes
Dendritic structure
Electrochemical analysis
Epitaxial growth
Li dendrites
Li metal anodes
Li transference number
Metal foils
modified separators
Nanotechnology
Plating
Preferred orientation
Separators
Substrates
textures
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The application of Li metal anodes is currently hindered by the uncontrolled growth of Li dendrites. Herein, the effects of a modified separator with a high Li+ transference number (t+) on the structure and electrochemical performance of Li metal anodes are reported. Stable and dendrite‐free plating/stripping cycles are achieved under current densities up to 5 mA cm−2 and areal capacities up to 20 mAh cm−2. The uniformly grown Li grains under the high t+ environment also exhibit well‐defined textures (preferred orientations). At a low plating capacity, epitaxial growth takes place on the {100} textures already existing in the rolled Li foils and the uniform Li+ flux strengthens this preferred orientation. Increasing the plating capacity to 20 mAh cm−2, the later‐grown textures change to {110} due to the reduced space charges and alleviated transport limits of Li+ under the high t+ environment, which favor the exposure of the close‐packed {110} planes. Compression‐induced  fiber textures are also resolved and the content increases with the plating capacity. Identification of the textures is meaningful for the exploration of advanced epitaxial substrates beyond Cu foils for high‐energy‐density Li metal batteries. LiS pouch cells are finally evaluated for the potential application of the modified separator. Dendrite‐free Li metal anodes are enabled by a modified separator with a high Li+ transference number based on Fe tetraaminophthalocyanine self‐assembled on rGO. Stable SEIs are formed with high Li+ transport kinetics. Well‐defined {100}, {110}, and  textures are identified and their evolutions with increasing deposition capacity are discussed. A LiS pouch cell containing the modified separator is demonstrated.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.202101881