Modified Sulfide Solid Electrolyte for High-Surface-Area Battery Coating

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Solution Overview

Problem

Existing sulfide solid electrolytes with high specific surface areas face challenges in coating suitability due to increased viscosity, leading to deteriorated battery capabilities, and there is a trade-off between coating suitability and battery performance in mass production.

Innovation Solution

A modified sulfide solid electrolyte containing specific compounds such as lithium, sulfur, phosphorus, and halogen atoms, along with compounds having formyl, acetyl, halogen-containing, thiol, metal-free phosphorus, and metal-free boron groups, enhances coating suitability while maintaining excellent battery capabilities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the specific surface area of sulfide solid electrolyte is increased to enhance battery capabilities, then the viscosity of the electrolyte increases, but coating suitability deteriorates

Engineering Contradiction:

Improvebattery capabilitiesVSAvoidcoating suitability

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

A coating layer comprising a compound with C=O bond or S=O bond is applied as an intermediary between the high-specific-surface-area sulfide solid electrolyte and the electrodes. This coating layer mediates the interaction, allowing the electrolyte to maintain its high battery capabilities while the coating provides the necessary coating suitability and controls viscosity effects during manufacturing.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention creates a composite structure by combining the sulfide solid electrolyte with a coating layer of organic compound. This composite material approach allows the electrolyte to achieve high specific surface area for enhanced battery performance while the coating layer compensates for viscosity increases and improves coating suitability for mass production.

Inventive Principle:

Principle #40Composite materials

2Reliability

If a coating layer is applied to enhance ionic conductivity, then battery capabilities improve, but production complexity increases

Engineering Contradiction:

Improveionic conductivityVSAvoidproduction complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The coating process is merged with the existing electrolyte production and assembly process. The organic compound coating is applied in a manner that integrates with standard manufacturing workflows, enhancing ionic conductivity without requiring separate, complex production steps or additional equipment.

Inventive Principle:

Principle #5Merging (Combining)

3Duration of action of stationary object

If organic compounds are added to improve affinity with electrodes, then cycle characteristics enhance, but manufacturing cost increases

Engineering Contradiction:

Improvecycle characteristicsVSAvoidmanufacturing cost

Core Design Contradiction:

Duration of action of stationary objectVSEase of manufacture

Solution Approach 1:

The invention optimizes the parameters of the organic compound coating, including the type of compound (those with C=O or S=O bonds), the thickness of the coating layer, and the concentration of the coating solution. By carefully controlling these parameters, the patent achieves enhanced cycle characteristics through improved electrode affinity while minimizing the amount of expensive organic compounds required, thus controlling manufacturing costs.

Inventive Principle:

Principle #35Parameter changes

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 modified electrolyte achieves improved coating suitability and efficient battery performance by reducing oil absorption and maintaining ionic conductivity, enabling efficient production of lithium ion batteries.

Implementation Method 1

enhance the ionic conductivity

Methodology Applied

Scientific EffectIonic conductivity: Conduction (electrical)

Implementation Method 2

enhancing the affinity of the solid electrolyte with an active substance used in a negative electrode, a positive electrode

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentUS20250316750A1Modified sulfide solid electrolyte, production method for same, electrode mixture, and lithium-ion battery

Publication Date: 2025.10.09 IDEMITSU KOSAN CO LTD

AI summary

Provided are a modified sulfide solid electrolyte containing a sulfide solid electrolyte having a BET specific surface area of 10 m2/g or more and containing a lithium atom, a sulfur atom, a phosphorus atom, and a halogen atom, and at least one compound selected from the particular compounds (1) to (6) that is excellent in coating suitability in coating as a paste, and can exhibit the excellent battery capabilities efficiently, irrespective of the large specific surface area of the sulfide solid electrolyte, and a method of producing the same, and also an electrode mixture and a lithium ion battery using the same.