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Title: Electrochemical and Interfacial Behavior of All Solid State Batteries Using Li10SnP2S12 Solid Electrolyte

Abstract

Thio-Lithium Superionic Conductor (Thio-LISICON) Li10GeP2S12 equivalent Li10SnP2S12 (LSPS) is comparable in ionic conductivity yet with a lower cost as an electrolyte for all solid-state batteries (ASSBs). ASSBs with LSPS solid electrolyte (SE), lithium-indium alloy anode, and LiCoO2 (LCO) cathode were successfully fabricated and their electrochemical performance at 60 °C was examined. Atomic layer deposition of Li3NbO4 on LCO was conducted to improve the interfacial stability. The Li3NbO4 coating significantly improves the cycle stability of the ASSB, which retains about 85% of the initial capacity after 70 cycles at a current density of 0.13 mA/cm2, while the ASSB with uncoated LCO retains ~ 60% of the initial capacity after 70 cycles. Electrochemical impedance spectroscopy tests indicate a rapid growth of charge transfer resistance upon cycling for the cell with the uncoated LCO, primarily due to the surface instability and build-up of a space charge layer between LSPS and LCO. However, the ASSBs with Li3NbO4 coated LCO show a more stable interface with a negligible impedance increase upon cycling, attributable to the buffering and passivating roles of the Li3NbO4 coating. The interfacial microstructure was analyzed to elucidate at the underlying reasons for the impedance increase and the pivotal role of the Li3NbO4more » coating. Our study indicates that the surface coating significantly improves the cycle stability of the ASSBs with LSPS as the electrolyte, mostly due to an improvement of the charge transfer mechanism. The coating reduced the interphase thickness and the interfacial resistance to about a third of the uncoated one after 10 cycles.« less

Authors:
 [1];  [2];  [3];  [4];  [2]; ORCiD logo [5];  [6]
  1. University of Washington
  2. UNIVERSITY OF WASHINGTON
  3. UNIVERSITY OF PITTSBURGH
  4. General Motors Global R&D Center
  5. BATTELLE (PACIFIC NW LAB)
  6. UNIVERSITY OF WASHINGTON (MAIN CAMPUS)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1511141
Report Number(s):
PNNL-SA-132845
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Power Sources
Additional Journal Information:
Journal Volume: 396
Country of Publication:
United States
Language:
English

Citation Formats

Vinado, Carolina, Wang, Shanyu, He, Yang, Xiao, Xingcheng, Li, Yun, Wang, Chongmin, and Yang, Jihui. Electrochemical and Interfacial Behavior of All Solid State Batteries Using Li10SnP2S12 Solid Electrolyte. United States: N. p., 2018. Web. doi:10.1016/j.jpowsour.2018.06.038.
Vinado, Carolina, Wang, Shanyu, He, Yang, Xiao, Xingcheng, Li, Yun, Wang, Chongmin, & Yang, Jihui. Electrochemical and Interfacial Behavior of All Solid State Batteries Using Li10SnP2S12 Solid Electrolyte. United States. doi:10.1016/j.jpowsour.2018.06.038.
Vinado, Carolina, Wang, Shanyu, He, Yang, Xiao, Xingcheng, Li, Yun, Wang, Chongmin, and Yang, Jihui. Fri . "Electrochemical and Interfacial Behavior of All Solid State Batteries Using Li10SnP2S12 Solid Electrolyte". United States. doi:10.1016/j.jpowsour.2018.06.038.
@article{osti_1511141,
title = {Electrochemical and Interfacial Behavior of All Solid State Batteries Using Li10SnP2S12 Solid Electrolyte},
author = {Vinado, Carolina and Wang, Shanyu and He, Yang and Xiao, Xingcheng and Li, Yun and Wang, Chongmin and Yang, Jihui},
abstractNote = {Thio-Lithium Superionic Conductor (Thio-LISICON) Li10GeP2S12 equivalent Li10SnP2S12 (LSPS) is comparable in ionic conductivity yet with a lower cost as an electrolyte for all solid-state batteries (ASSBs). ASSBs with LSPS solid electrolyte (SE), lithium-indium alloy anode, and LiCoO2 (LCO) cathode were successfully fabricated and their electrochemical performance at 60 °C was examined. Atomic layer deposition of Li3NbO4 on LCO was conducted to improve the interfacial stability. The Li3NbO4 coating significantly improves the cycle stability of the ASSB, which retains about 85% of the initial capacity after 70 cycles at a current density of 0.13 mA/cm2, while the ASSB with uncoated LCO retains ~ 60% of the initial capacity after 70 cycles. Electrochemical impedance spectroscopy tests indicate a rapid growth of charge transfer resistance upon cycling for the cell with the uncoated LCO, primarily due to the surface instability and build-up of a space charge layer between LSPS and LCO. However, the ASSBs with Li3NbO4 coated LCO show a more stable interface with a negligible impedance increase upon cycling, attributable to the buffering and passivating roles of the Li3NbO4 coating. The interfacial microstructure was analyzed to elucidate at the underlying reasons for the impedance increase and the pivotal role of the Li3NbO4 coating. Our study indicates that the surface coating significantly improves the cycle stability of the ASSBs with LSPS as the electrolyte, mostly due to an improvement of the charge transfer mechanism. The coating reduced the interphase thickness and the interfacial resistance to about a third of the uncoated one after 10 cycles.},
doi = {10.1016/j.jpowsour.2018.06.038},
journal = {Journal of Power Sources},
number = ,
volume = 396,
place = {United States},
year = {2018},
month = {8}
}