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Title: Amorphous Lithium Lanthanum Titanate for Solid-State Microbatteries

Journal Article · · Journal of the Electrochemical Society
DOI:https://doi.org/10.1149/2.0411701jes· OSTI ID:1595351
 [1];  [1];  [2];  [1];  [1]
  1. Univ. of California, San Diego, CA (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)

Lithium lanthanum titanate (LLTO) is a promising solid state electrolyte for solid state batteries due to its demonstrated high bulk ionic conductivity. However, crystalline LLTO has a relatively low grain boundary conductivity, limiting the overall material conductivity. In this work, we investigate amorphous LLTO (a-LLTO) thin films grown by pulsed laser deposition (PLD). By controlling the background pressure and temperature we are able to optimize the ionic conductivity to 3 × 10–4 S/cm and electronic conductivity to 5 × 10–11 S/cm. XRD, TEM, and STEM/EELS analysis confirm that the films are amorphous and indicate that oxygen background gas is necessary during the PLD process to decrease the oxygen vacancy concentration, decreasing the electrical conductivity. Amorphous LLTO is deposited onto high voltage LiNi0.5Mn1.5O4 (LNMO) spinel cathode thin films and cycled up to 4.8 V vs. Li showing excellent capacity retention. Finally, these results demonstrate that a-LLTO has the potential to be integrated into high voltage thin film batteries.

Research Organization:
Univ. of California, San Diego, CA (United States); Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0002357; SC0012704
OSTI ID:
1595351
Alternate ID(s):
OSTI ID: 1346755
Report Number(s):
BNL-113655-2017-JA
Journal Information:
Journal of the Electrochemical Society, Vol. 164, Issue 1; ISSN 0013-4651
Publisher:
The Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

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Cited By (4)

A Simple and Fast Electrochemical CO 2 Sensor Based on Li 7 La 3 Zr 2 O 12 for Environmental Monitoring journal September 2018
Recent Progress in Lithium Lanthanum Titanate Electrolyte towards All Solid-State Lithium Ion Secondary Battery journal September 2018
Superior Electrochemical Performance of Amorphous Titanium Niobium Oxide Thin Films for Li-Ion Thin Film Batteries journal January 2018
Pulsed Laser Deposited Films for Microbatteries journal June 2019