Premium
Nano‐Scale Complexions Facilitate Li Dendrite‐Free Operation in LATP Solid‐State Electrolyte
Author(s) -
Stegmaier Sina,
Schierholz Roland,
Povstugar Ivan,
Barthel Juri,
Rittmeyer Simon P.,
Yu Shicheng,
Wengert Simon,
Rostami Samare,
Kungl Hans,
Reuter Karsten,
Eichel RüdigerA.,
Scheurer Christoph
Publication year - 2021
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202100707
Subject(s) - materials science , nucleation , amorphous solid , dendrite (mathematics) , chemical physics , electrolyte , ionic conductivity , fast ion conductor , grain boundary , nanotechnology , condensed matter physics , crystallography , thermodynamics , composite material , microstructure , chemistry , physics , geometry , mathematics , electrode
Dendrite formation and growth remains a major obstacle toward high‐performance all solid‐state batteries using Li metal anodes. The ceramic Li (1+ x ) Al ( x ) Ti (2− x ) (PO 4 ) 3 (LATP) solid‐state electrolyte shows a higher than expected stability against electrochemical decomposition despite a bulk electronic conductivity that exceeds a recently postulated threshold for dendrite‐free operation. Here, transmission electron microscopy, atom probe tomography, and first‐principles based simulations are combined to establish atomistic structural models of glass‐amorphous LATP grain boundaries. These models reveal a nanometer‐thin complexion layer that encapsulates the crystalline grains. The distinct composition of this complexion constitutes a sizable electronic impedance. Rather than fulfilling macroscopic bulk measures of ionic and electronic conduction, LATP might thus gain the capability to suppress dendrite nucleation by sufficient local separation of charge carriers at the nanoscale.