Microband-Array Electrode Technique for the Detection of Reaction Distributions in the Depth Direction of Composite Electrodes for the All-Solid-State Lithium-Ion Batteries.

Masanobu Chiku,Keiichiro Ota,Hiroshi Inoue,Eiji Higuchi

doi:10.1021/acsomega.0c00949

Abstract

There are several problems left to be solved for the practical use of an all-solid-state lithium-ion battery (ASSLIB) such as the inhomogeneous reaction of active materials due to the intermittent ion/electron conduction pathway. In this study, a triple-microband electrode was embedded in the composite positive electrode of ASSLIB for the direct measurement of the reaction distribution of active materials. We found that the balance of the ionic/electronic conductivity of the composite electrode determines the reaction distribution in the depth direction of the composite electrode. Moreover, the active material was utilized equally even in the composite electrode, which has balanced ionic/electric conductivity and 300 μm thickness.

Highlights

The introduction of low-emission vehicles is a key for the reduction of greenhouse gas emission, which is a solution to global warming.[1]
All-solid-state Lithium-ion batteries (LIBs) (ASSLIBs) are one of the most promising batteries for use in EVs12 because they use a nonflammable solid electrolyte (SE), which can decrease the possibility for the explosion of a damaged rechargeable battery
Intermittent electron and ion conductive networks in an all-solid-state lithium-ion battery (ASSLIB) account for low utilization of the active material and significant capacity loss.[15−17] Research with various spectroscopic methods and mathematical-model simulations has been conducted to understand the distribution of the depth of discharge (DOD) for each active material particle in composite electrodes of LIBs with a liquid electrolyte and provided useful findings to improve performance by tuning parameters such as porosity, thickness, and particle size;[18−22] there are a limited number of Received: April 10, 2020

Summary

■ INTRODUCTION

The introduction of low-emission vehicles is a key for the reduction of greenhouse gas emission, which is a solution to global warming.[1]. Intermittent electron and ion conductive networks in an ASSLIB account for low utilization of the active material and significant capacity loss.[15−17] Research with various spectroscopic methods and mathematical-model simulations has been conducted to understand the distribution of the depth of discharge (DOD) for each active material particle in composite electrodes of LIBs with a liquid electrolyte and provided useful findings to improve performance by tuning parameters such as porosity, thickness, and particle size;[18−22] there are a limited number of Received: April 10, 2020 Accepted: June 10, 2020 Published: June 26, 2020. The current method will accelerate further development of ASSLIBs and provide a guideline for tuning the composite electrode parameters

■ RESULTS AND DISCUSSION

■ ACKNOWLEDGMENTS

■ REFERENCES