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Avoiding CO 2 Improves Thermal Stability at the Interface of Li 7 La 3 Zr 2 O 12 Electrolyte with Layered Oxide Cathodes

Journal Article · · Advanced Energy Materials
 [1];  [2];  [2];  [1]
  1. Laboratory for Electrochemical Interfaces Department of Nuclear Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA, Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
  2. National Synchrotron Light Source II Brookhaven National Laboratory Upton NY 11973 USA
Abstract

Solid‐state batteries promise higher energy densities and better safety than Li‐ion batteries with liquid electrolytes. However, the interface between solid electrolyte and cathode is unstable at the elevated temperatures that are needed while sintering to achieve good bonding between ceramic components. Here, the hypothesis is that, the gas environment, especially the presence of CO 2, is critical in determining the stability of the solid electrolyte–cathode interface. The effect of gas species on the interface is systematically probed, by a using Li 7 La 3 Zr 2 O 12 (LLZO) solid electrolyte with a thin film LiNi 0.6 Mn 0.2 Co 0.2 O 2 cathode as a model system to enable interface sensitivity. Detrimental phases formed at the interface and their onset conditions are identified by X‐ray absorption spectroscopy, X‐ray diffraction, and Gibbs free energy analysis. As a result, removing CO 2 and minimizing H 2 O(g) during sintering is necessary to obtain good contact at the LLZO|cathode interface without forming secondary phases. Sintering in O 2 is ideal, yielding excellent chemical stability and low interfacial resistance. Secondary phases also do not form in N 2, but oxygen loss occurs at elevated temperatures. The interfacial resistance obtained upon sintering in pure O 2 is comparable to the lowest values at LLZO interfaces with protective coatings, but here without the need for interface coatings.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)' US Army Research Office
Grant/Contract Number:
SC0012704
OSTI ID:
1845582
Alternate ID(s):
OSTI ID: 1845584
OSTI ID: 1887538
OSTI ID: 23130442
Report Number(s):
BNL-223302-2022-JAAM; 2102741
Journal Information:
Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 13 Vol. 12; ISSN 1614-6832
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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