All Solid Battery Electrode Carbon Segmentation

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Solution Overview

Problem

Oxide-based solid electrolytes with carbon powders suffer from degraded sintering and ionic conductivity, which hinders the achievement of preferable electron and ionic conductivity in all solid batteries.

Innovation Solution

Incorporating both micro particle carbon and board-shaped carbon into the electrode layers of all solid batteries, with a controlled weight ratio, to enhance electron conductivity while maintaining sufficient sintering and ionic conductivity, and using an oxide-based solid electrolyte with a NASICON structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If carbon powders are added to the oxide-based solid electrolyte to achieve electron conductivity, then electron conductivity is improved, but sintering property is degraded

Engineering Contradiction:

Improveelectron conductivityVSAvoidsintering property

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent segments carbon into two types with different functions: micro particle carbon for electron conductivity and board-shaped carbon for maintaining sintering properties. The board-shaped carbon's geometry allows it to act as a sintering aid while the micro particle carbon provides conductivity without significantly affecting sintering, thus resolving the contradiction

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the physical parameters of carbon additives by using specific particle size ranges (micro particle: 0.5-5 μm, board-shaped: 5-20 μm) and aspect ratios (3-10:1). These parameter changes optimize the balance between electron conductivity and sintering properties, resolving the contradiction through controlled physical characteristics

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 approach improves the performance of all solid batteries by achieving preferable electron and ionic conductivity, ensuring stable operation and increased discharge capacity, while maintaining cost-effectiveness.

Implementation Method 1

at least one of the first electrode layer and the second electrode layer includes a micro particle carbon and a board-shaped carbon

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

ionic conductivity may be degraded, when the carbon powders exist in the oxide-based solid electrolyte

Methodology Applied

Scientific EffectIonic conductivity: Fast Ion Conductor

Implementation Method 3

in oxide-based solid electrolyte formed by sintering, sintering property of the oxide-based electrolyte may be degraded

Methodology Applied

Scientific EffectSintering: Sintering

Data Source

PatentUS11075368B2All solid battery and manufacturing method of the same

Publication Date: 2021.07.27 TAIYO YUDEN KK

AI summary

An all solid battery includes: a solid electrolyte layer including an oxide-based electrolyte; a first electrode layer that is formed on a first face of the solid electrolyte layer and includes a ceramic grain; and a second electrode layer that is formed on a second face of the solid electrolyte layer and includes a ceramic grain, wherein at least one of the first electrode layer and the second electrode layer includes a micro particle carbon and a board-shaped carbon.