Borohydride-Coated Anode Mixture for Stable Solid-State Battery Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Sulfide solid electrolytes in all solid state batteries are susceptible to reduction, leading to increased resistance and degradation of anode active materials, which affects ionic conductivity and cycling life.
Innovation Solution
An anode mixture comprising a coated anode active material with a borohydride solid electrolyte containing LiBH4 and LiX, where the coating layer covers at least a portion of the anode active material, and is combined with an argyrodite-type sulfide solid electrolyte to suppress resistance increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If sulfide solid electrolyte is used to achieve high ionic conductivity, then ionic conductivity is improved, but resistance increases due to reduction and degradation layer formation
Solution Approach 1:
A coating layer containing borohydride solid electrolyte (LiBH4 and LiX where X is Cl, Br, or I) is applied to the anode active material surface. This coating layer acts as an intermediary between the anode active material and the sulfide solid electrolyte, preventing direct harmful interactions while maintaining ionic conductivity. The coating layer suppresses reduction reactions and prevents degradation layer formation, thereby stabilizing resistance over cycling.
2Use of energy by moving object
If additional components are added to improve solid electrolyte conductivity, then ionic conductivity is improved, but device complexity increases
Solution Approach 1:
The solid electrolyte system uses a composite structure combining sulfide solid electrolyte with a coating layer of borohydride solid electrolyte (LiBH4 and LiX). This composite approach leverages the high ionic conductivity of sulfide electrolytes while using the coating layer to provide chemical stability and prevent degradation. The specific combination of LiBH4 with LiCl, LiBr, or LiI creates a functional composite that addresses both conductivity and stability requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The anode mixture effectively inhibits the formation of deteriorated layers, thereby reducing resistance and improving cyclability and ion conductivity, maintaining battery performance over repeated charge and discharge cycles.
Implementation Method 1
a sulfide solid electrolyte exhibits good ionic conductivity, it is susceptible to reduction, and a degradation layer may be formed on an anode active material in contact with the sulfide solid electrolyte
Implementation Method 2
an all solid state battery using sulfide based solid electrolyte has been actively studied in recent years because of its high-ionic conductivity
Data Source
AI summary
A main object of the present disclosure is to provide an anode mixture capable of suppressing an increase in resistance. The present disclosure achieves the object by providing an anode mixture used for an all solid state battery, the anode mixture comprising a coated anode active material and a sulfide solid electrolyte, wherein the coated anode active material comprises an anode active material and a coating layer covering at least a portion of the surface of the anode active material, and the coating layer contains a borohydride solid electrolyte containing LiBH4 and LiX, wherein X is selected from Cl, Br and I.