Journal
ACS APPLIED ENERGY MATERIALS
Volume 1, Issue 8, Pages 3622-3629Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b00280
Keywords
sulfide solid electrolyte; all-solid-state lithium battery; liquid-phase technique; argyrodite-type crystal; alcohol solvent; solution process
Funding
- Advanced Low Carbon Technology Specially Promoted Research for Innovative Next Generation Batteries (ALGA-SPRING) program from the Japan Science and Technology Agency (JST)
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Argyrodite-type crystals, Li6PS5X (X = Cl, Br, I), are promising solid electrolytes (SEs) for bulk-type all-solid-state lithium-ion batteries with excellent safety and high energy densities because of their high ionic conductivities and electrochemical stabilities. However, these advantageous features alone are not sufficient to achieve good cell performance. It is also critically important to have a simple Removing and effective synthetic route to SEs and techniques for solvent forming favorable solid-solid interfaces with large contact areas between the electrode and electrolyte particles. Here, we report an effective route for the preparation of argyrodite-type crystals using a liquid-phase technique via a homogeneous ethanol solution to improve cell performance using an SE-coating on the active material. The preparation conditions, such as appropriate halogen species and alcohol solvents, dissolution time, and drying temperature, are examined, finally resulting in Li6PS5Br with a lithium-ion conductivity of 1.9 x 10(-4) S cm(-1). Importantly, the obtained solution forms a favorable solid-solid electrode-electrolyte interface with a large contact area in the all-solid-state cells, resulting in a higher capacity than conventional techniques such as hand mixing using a mortar.
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