Solid-State Battery Electrode Composition for Harder, Longer-Life Films
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Solution Overview
Problem
All-solid state secondary batteries with organic electrolytes face issues of low film hardness and insufficient cycle characteristics due to the use of electrode mixtures described in existing literature, leading to concerns about safety and reliability.
Innovation Solution
An electrode composition comprising an inorganic solid electrolyte, an active material, and a binder with specific functional groups, where the distribution rate of the binder exceeds 60%, forming an inorganic solid electrolyte-polymer network that enhances film hardness and cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an inorganic solid electrolyte and active material are mixed according to existing literature (JP5375975B), then the electrode mixture can be formed, but the film hardness of the electrode active material layer becomes low
Solution Approach 1:
The invention changes the chemical composition parameters of the binder by specifying functional groups (amino, sulfanyl, hydroxy, carboxy, or anone groups) and requires a distribution rate exceeding 60% to the inorganic solid electrolyte. This parameter change transforms the binder's interaction with the inorganic solid electrolyte, resulting in improved film hardness while maintaining cycle characteristics.
Solution Approach 2:
The invention creates a composite structure where the binder forms a network with the inorganic solid electrolyte particles. This composite material approach, where the binder distributes around and binds the inorganic solid electrolyte and active material, produces an electrode active material layer with enhanced film hardness and reliable cycle characteristics.
2Ease of operation
If organic electrolytic solution is used in lithium ion secondary batteries, then the battery can operate, but liquid leakage occurs and safety concerns arise due to short-circuit and ignition risks
Solution Approach 1:
The invention transitions the electrolyte from liquid (organic electrolytic solution) to solid phase (inorganic solid electrolyte). This phase transition eliminates liquid leakage risks and improves safety regarding short-circuit and ignition concerns, while the binder ensures proper distribution and binding in the solid-state structure.
Solution Approach 2:
The binder acts as an intermediary material that enables proper interaction between the solid inorganic solid electrolyte and active material. The binder's functional groups facilitate binding to the inorganic solid electrolyte surface, ensuring effective material distribution and maintaining battery operation in the all-solid-state configuration.
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 proposed electrode composition improves the film hardness and cycle performance of the electrode active material layer, leading to enhanced safety and reliability in all-solid state secondary batteries.
Implementation Method 1
a distribution rate of the distributing component to the inorganic solid electrolyte in an electrode active material layer formed of the electrode composition exceeds 60%
Data Source
AI summary
Provided are an electrode composition, an electrode sheet for an all-solid state secondary battery and an all-solid state secondary battery that are formed of the electrode composition, and respective methods of manufacturing the electrode composition, the electrode sheet for an all-solid state secondary battery, and the all-solid state secondary battery. The electrode composition includes: an inorganic solid electrolyte; an active material; and a distributing component that binds to the inorganic solid electrolyte and the active material, in which one kind of the distributing component is a binder, a polymer forming the binder includes a repeating unit having an amino group, a sulfanyl group, a hydroxy group, a carboxy group, or an anone group, and a distribution rate of the distributing component to the inorganic solid electrolyte in an electrode active material layer formed of the electrode composition exceeds 60%.