Electrode for an all-solid-state battery including two types of conductive materials and method of manufacturing same

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Solution Overview

Problem

All-solid-state batteries face challenges in enhancing electronic conductivity due to low dispersibility of conductive materials, leading to excess conductive material that does not contribute to conduction and reacts with the solid electrolyte, thereby lowering output characteristics.

Innovation Solution

The electrode for all-solid-state batteries incorporates a composite structure with a spherical conductive material attached to the surface of the electrode active material and a linear conductive material, adhering to specific surface area and weight percentage ratios, and is manufactured using a resonance vibration mixer to improve dispersibility and minimize excess conductive material.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conductive material is added to improve electronic conductivity, then electronic conductivity increases, but excess conductive material reacts with solid electrolyte and lowers output characteristics

Engineering Contradiction:

Improveelectronic conductivityVSAvoidside-reactions with solid electrolyte

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies local quality by attaching spherical conductive material specifically to the surface of electrode active material particles rather than uniformly distributing it throughout the electrode. This localized attachment ensures conductive material is positioned exactly where needed for electron transport while minimizing excess material that would otherwise react with the solid electrolyte.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs preliminary action by pre-attaching the spherical conductive material to the electrode active material surface before assembling the complete electrode structure. This preliminary attachment ensures proper dispersion and positioning, preventing aggregation and reducing the amount of excess conductive material that would react with the solid electrolyte.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If conductive material is dispersed in the electrode, then electronic conduction is improved, but dispersibility is low leading to excess conductive material

Engineering Contradiction:

Improveelectronic conductionVSAvoiddispersibility of conductive material

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent achieves improved dispersibility through local quality by attaching spherical conductive material to the surface of electrode active material particles. This localized surface attachment prevents aggregation and ensures uniform distribution throughout the electrode structure, eliminating the dispersibility problems associated with bulk mixing approaches.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent creates a composite structure where spherical conductive material is attached to electrode active material particles. This composite approach combines the conductive properties of the spherical material with the electroactive properties of the electrode material, achieving both good dispersibility and effective electronic conduction pathways.

Inventive Principle:

Principle #40Composite materials

3Reliability

If spherical conductive material is used for short-distance conduction, then electronic conductivity is enhanced, but amount of conductive material must be precisely controlled

Engineering Contradiction:

Improveelectronic conductivityVSAvoidamount of conductive material

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent precisely controls the amount of spherical conductive material by attaching it locally to the surface of electrode active material particles. This localized attachment ensures that conductive material is present in exactly the right quantity - sufficient to create effective electron transport pathways but not excessive to cause harmful side-reactions with the solid electrolyte.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs preliminary action by pre-attaching a controlled amount of spherical conductive material to the electrode active material surface before electrode assembly. This preliminary attachment step ensures precise dosage control, preventing both deficiency (which would limit conductivity) and excess (which would cause harmful reactions).

Inventive Principle:

Principle #10Preliminary action

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 structure enhances electronic conductivity by ensuring proper dispersibility of the conductive materials, reducing excess material, and minimizing side-reactions, resulting in improved initial efficiency, discharge capacity, and capacity retention of the all-solid-state batteries.

Implementation Method 1

a resonance vibration mixer may be used

Methodology Applied

Scientific EffectUltrasonic vibration: Ultrasonic Vibration

Data Source

PatentUS20250226385A1Electrode for an all-solid-state battery including two types of conductive materials and method of manufacturing same

Publication Date: 2025.07.10 HYUNDAI MOTOR CO LTD

AI summary

Described are an electrode for an all-solid-state battery including two types of conductive materials and a method of manufacturing the same. The electrode includes a composite including an electrode active material and a spherical conductive material attached to the surface of the electrode active material, a solid electrolyte, and a linear conductive material.