Contact Surface Adjusting Material for Solid Electrolytes

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Solution Overview

Problem

Inorganic solid electrolytes exhibit high interface resistance due to their non-deformable nature, leading to point-to-point contact between the oxide solid electrolytes and electrode active materials, which hinders efficient ion transmission.

Innovation Solution

A contact surface adjusting material comprising a polymer base material and an additive, capable of dissociating metal salts and acting as a plasticizer, is used to form a composite electrolyte system with a bridging portion or shell layer that facilitates surface-to-surface contact between inorganic solid electrolyte particles, reducing interface resistance and enhancing ion conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If inorganic solid electrolytes are used to ensure high thermal stability and safety, then safety is improved, but interface resistance increases due to point-to-point contact

Engineering Contradiction:

ImprovesafetyVSAvoidinterface resistance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces an organic polymer electrolyte as an intermediary layer between the inorganic solid electrolyte particles and the electrode active material. This intermediary material fills the gaps between rigid inorganic particles, transforming the point-to-point contact into surface-to-surface contact, thereby reducing interface resistance while maintaining the safety benefits of inorganic solid electrolytes

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite electrolyte system that combines inorganic solid electrolyte particles with organic polymer electrolyte. This composite structure leverages the high thermal stability of inorganic materials while utilizing the deformable nature of organic polymers to achieve better contact and lower interface resistance

Inventive Principle:

Principle #40Composite materials

2Temperature

If oxide solid electrolytes are used to achieve high thermal stability, then thermal stability is improved, but contact area with electrode material decreases leading to high interface resistance

Engineering Contradiction:

Improvethermal stabilityVSAvoidcontact area

Core Design Contradiction:

TemperatureVSArea of stationary object

Solution Approach 1:

The patent introduces dynamic flexibility into the electrolyte system by incorporating organic polymer electrolyte that can deform and adapt to the electrode surface. This dynamic component compensates for the rigidity of oxide solid electrolytes, enabling the contact area to expand from point-to-point to surface-to-surface contact

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies different material properties to different regions: inorganic solid electrolyte particles provide local thermal stability, while the organic polymer electrolyte filling the interstices provides local deformability and enhanced contact area. This local differentiation resolves the contradiction between thermal stability and contact area

Inventive Principle:

Principle #3Local quality

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 composite electrolyte system achieves lower interface resistance and improved ion conductivity by allowing surface-to-surface contact, while maintaining mechanical strength and preventing volatility issues, thus enhancing the performance of solid electrolytes in electrochemical systems.

Implementation Method 1

the additive is capable of dissociating metal salts and served as a plasticizer

Methodology Applied

Scientific EffectDissociation:

Implementation Method 2

the additive is capable of dissociating metal salts and served as a plasticizer

Methodology Applied

Scientific EffectPlasticization:

Implementation Method 3

The polymer base material is capable of allowing metal ions to move inside

Methodology Applied

Scientific EffectIon conduction: Conduction (electrical)

Implementation Method 4

a bridging portion located between the first particle and the second particle and composed of the contact surface adjusting material for solid electrolytes is used to adhere the first particle and the second particle

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS11495825B2Contact surface adjusting material for solid electrolytes and composite electrolyte system thereof

Publication Date: 2022.11.08 PROLOGIUM TECHNOLOGY CO LTD

AI summary

The invention provides a contact surface adjusting material for solid electrolytes and composite electrolyte system thereof. The contact surface adjusting material is mainly composed of a polymer base material, which is capable of allowing metal ions to move inside the material, and an additive, which is capable of dissociating metal salts and is served as a plasticizer. The contact surface adjusting material is applied to a surface of the solid electrolytes to construct a face-to-face transmission mode. Therefore, the problems of the high resistances caused by the directly contact of the solid electrolytes are eliminated.