Solid-State Battery Electrode Layout for Uniform Conductive Paths

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Solution Overview

Problem

Existing electrodes in batteries suffer from uneven distribution of conductive additives, leading to poor electron conduction paths and decreased discharge capacity retention rates.

Innovation Solution

The electrode design includes a specific interfacial perimeter of the conductive additive, greater than 0.58 μm/μm², ensuring even dispersion and formation of good electron conduction paths by controlling the distribution of conductive additives and solid electrolytes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conductive additive is added to electrode material, then electronic conductivity is improved, but uneven distribution occurs leading to poor electron conduction paths

Engineering Contradiction:

Improvedischarge capacity retention rateVSAvoiduniformity of conductive additive distribution

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent changes the physical state parameter of the electrolyte from liquid to solid, and controls the interfacial perimeter parameter of conductive additive to greater than 0.58 μm/μm². This parameter control ensures uniform distribution of conductive additive while maintaining good electron conduction paths, resolving the contradiction between improving conductivity and maintaining composition uniformity.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If conductive additive is aggregated to improve conductivity, then electron conduction paths are formed, but distribution becomes uneven

Engineering Contradiction:

Improvedischarge capacity retention rateVSAvoiddistribution uniformity of conductive additive

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent applies local quality by controlling the interfacial perimeter of conductive additive at specific locations within the electrode. By ensuring the interfacial perimeter is greater than 0.58 μm/μm², the conductive additive achieves optimal local distribution characteristics that promote uniform dispersion while maintaining effective electron conduction paths throughout the electrode structure.

Inventive Principle:

Principle #3Local quality

3Stability of the object's composition

If solid electrolyte is used instead of liquid, then battery stability is improved, but electron exchange efficiency decreases

Engineering Contradiction:

Improvebattery stabilityVSAvoiddischarge capacity retention rate

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent introduces conductive additive as an intermediary between the solid electrolyte and active material. This intermediary facilitates electron exchange efficiency by providing conductive pathways that overcome the limitations of solid electrolyte, while the controlled interfacial perimeter ensures the intermediary is optimally distributed to maintain both stability and performance.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

This design improves the discharge capacity retention rate of the battery by facilitating better electron exchange and reducing inner resistance.

Implementation Method 1

a conductive additive, in which a length of an interface of the conductive additive per unit area of a cross section of the electrode is greater than 0.58 μm/μm2

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS20260058164A1Electrode and battery

Publication Date: 2026.02.26 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

An electrode according to the present disclosure includes an active material, a solid electrolyte, and a conductive additive, in which a length of an interface of the conductive additive per unit area of a cross section of the electrode is greater than 0.58 μm/μm2.