Nonspherical Polymer Particles in Solid Electrolyte Composition
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Solution Overview
Problem
Current all-solid-state secondary batteries face challenges with increased interface resistance due to hard solid electrolytes, which existing polymer binders fail to adequately address, requiring improved ion conductance and binding properties without pressurization.
Innovation Solution
A solid electrolyte composition comprising nonspherical polymer particles with specific functional groups, a glass transition temperature between -50°C to 50°C, and a dispersion medium, which are mechanically dispersed with an inorganic solid electrolyte to form a slurry, then applied and heated to create an electrode sheet for the battery, enhancing ion conductance and binding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic solid electrolyte is used, then reliability and incombustibility are improved, but interface resistance increases
Solution Approach 1:
The patent introduces polymer particles as an intermediary substance between the inorganic solid electrolyte particles. These polymer particles with functional groups act as mediators that improve interfacial contact and reduce interface resistance while maintaining the reliability benefits of inorganic solid electrolytes.
Solution Approach 2:
The patent creates a composite electrolyte system combining inorganic solid electrolyte particles with polymer particles. This composite structure leverages the high reliability of inorganic materials while using the polymer component to reduce interface resistance and improve ion conductance.
2Reliability
If polymer binder is added to reduce interface resistance, then binding properties improve, but ion conductance may decrease
Solution Approach 1:
The patent applies local quality by using polymer particles with specific functional groups localized at their surfaces. This allows the polymers to provide binding properties at the interface while maintaining ion conductance through the bulk electrolyte structure.
Solution Approach 2:
The patent changes key parameters of the polymer material, specifically selecting polymers with glass transition temperatures between -50°C to 50°C and incorporating specific functional groups. These parameter changes optimize both binding properties and ion conductance simultaneously.
3Ease of manufacture
If spherical polymer particles are used, then ease of manufacture is improved, but binding properties and ion conductance are insufficient
Solution Approach 1:
The patent intentionally departs from spherical geometry by using nonspherical polymer particles. This shape modification increases the surface area and improves interfacial contact between particles, thereby enhancing binding properties and ion conductance while remaining manufacturable.
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 solution effectively prevents ion conductance decrease and achieves favorable binding properties in all-solid-state secondary batteries, improving their performance without the need for pressurization.
Implementation Method 1
mechanically dispersed with an inorganic solid electrolyte to form a slurry
Implementation Method 2
applied and heated to create an electrode sheet
Data Source
AI summary
Provided is a solid electrolyte composition including nonspherical polymer particles; a dispersion medium; and an inorganic solid electrolyte, in which the nonspherical polymer particles is formed of a polymer having at least one of a specific functional group, an acidic group having an acid dissociation constant pKa of 14 or less, or a basic group having a conjugate acid pKa of 14 or less.