Solid-State Battery Electrode Structure for Uniform Conductive Additives

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

The uneven distribution of conductive additives in electrodes leads to poor electron conduction paths, resulting in decreased discharge capacity retention rates of batteries.

Innovation Solution

The electrode design includes a specific interfacial perimeter of the conductive additive per unit area greater than 0.58 µm², ensuring even distribution and improved electron exchange, achieved through careful control of the electrode's cross-sectional structure and composition.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conductive additive is added to electrode material, then electronic conductivity is improved, but conductive additive aggregates and distributes unevenly, 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, which fundamentally alters the distribution behavior of conductive additives. In solid electrolytes, the conductive additives remain uniformly distributed without aggregating, as the solid matrix prevents the settling and clustering that occurs in liquid electrolytes under gravitational force.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the liquid-based mechanical mixing and distribution system with a solid electrolyte system where uniform distribution is achieved through the solid matrix structure itself, eliminating the need for complex mixing processes and preventing aggregation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If conductive additive aggregates in the electrode, then electron conduction paths are disrupted, but increasing conductive additive amount to compensate worsens distribution uniformity

Engineering Contradiction:

Improvedischarge capacity retention rateVSAvoidelectron conduction path continuity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

By changing the electrolyte state to solid, the patent eliminates the aggregation phenomenon that disrupts electron conduction paths. The solid electrolyte matrix maintains consistent spacing between conductive additive particles, ensuring continuous and uniform electron conduction paths without requiring increased additive amounts.

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

This design enhances the discharge capacity retention rate of the battery by facilitating better electron conduction paths, leading to improved performance and efficiency.

Implementation Method 1

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/μm 2... facilitates better electron conduction paths

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentEP4712156A1Electrode and battery

Publication Date: 2026.03.18 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

Figure 1~2

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.