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Updated: Sep 14, 2025
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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
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Highly Deformable, Ion-Conductive Borohydride-Substituted Sulfide Electrolyte for Superior Performance at Low Stack
Shunsuke Kawaguchi1, Naomi Fukiya1, Kei Ehara1
1Consortium of Lithium Ion Battery Technology and Evaluation Research Center (LIBTEC), 1-8-31 Midorigaoka, Ikeda, Osaka, 563-8577, Japan.
Advanced Materials (Deerfield Beach, Fla.)
|July 21, 2025
Summary
This study shows that a deformable solid electrolyte, Li3PS4-xLiBH4 (LPSBH), enables stable interfaces in all-solid-state batteries. This breakthrough allows for high-performance energy storage with excellent cycle life.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- All-solid-state batteries (ASSBs) offer a safer alternative to conventional lithium-ion batteries.
- Achieving optimal performance in ASSBs hinges on establishing stable interfaces between electrode active materials (AM) and solid electrolytes (SE).
- Reducing interfacial resistance at the AM-SE junction is a critical challenge for ASSB development.
Purpose of the Study:
- To investigate the mechanical properties, specifically deformability, of Li3PS4-xLiBH4 (LPSBH), a sulfide-based solid electrolyte.
- To evaluate the formation of a stable physical interfacial contact between LPSBH and electrode active materials.
- To demonstrate the performance of ASSBs utilizing LPSBH under low applied pressure.
Main Methods:
- Synthesis of LPSBH solid electrolyte via mechanical milling.
- Evaluation of LPSBH deformability and relative density achieved under low pressures.
- Fabrication and testing of symmetric cells to quantitatively assess AM-SE interfacial contact.
- Assembly and electrochemical testing of a 13 mAh-class laminated ASSB incorporating LPSBH.
Main Results:
- LPSBH exhibits sufficient deformability to achieve high relative density at low applied pressures.
- A good AM-SE interfacial contact was successfully formed within the electrode layer, confirmed by symmetric cell testing.
- The laminated ASSB demonstrated 6C charging capability at 25 °C with only 5 MPa stacked pressure.
- The cell maintained approximately 70% of its capacity after 1000 cycles under 1C/1C conditions, indicating significant cycle stability.
Conclusions:
- The deformability of LPSBH is crucial for creating effective AM-SE interfaces in ASSBs.
- Low-pressure processing of LPSBH enables high-performance ASSBs with enhanced cycle stability.
- This work presents a viable pathway for developing practical and high-performance all-solid-state batteries.
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