Carbon Negative Electrode Structure for Stable All-Solid-State Cycling

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Solution Overview

Problem

Carbon materials used as negative-electrode active materials in all-solid-state batteries exhibit suboptimal cycle characteristics and initial charge/discharge efficiency, necessitating improvements to enhance battery performance.

Innovation Solution

A negative electrode comprising a carbon material with an interplanar spacing of 0.336 nm to less than 0.350 nm and a spring-back ratio of 13% or more, combined with a sulfide solid electrolyte, is used to improve the cycle characteristics and initial charge/discharge efficiency of all-solid-state batteries.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If carbon material is used as negative-electrode active material, then cost efficiency is improved, but cycle characteristics deteriorate

Engineering Contradiction:

Improvecost efficiencyVSAvoidcycle characteristics

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies parameter changes by precisely controlling the interplanar spacing (d002) of the carbon material to be 0.336 nm to less than 0.350 nm and the spring-back ratio to be 13% or more. These specific parameter ranges transform the carbon material's structural properties to achieve both cost efficiency and excellent cycle characteristics, resolving the contradiction between using inexpensive carbon materials and maintaining reliable cycle performance.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If carbon material is used as negative-electrode active material, then cost efficiency is improved, but initial charge/discharge efficiency deteriorates

Engineering Contradiction:

Improvecost efficiencyVSAvoidinitial charge/discharge efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent utilizes parameter changes by optimizing the interplanar spacing (d002) to 0.336 nm to less than 0.350 nm and the spring-back ratio to 13% or more. These parameter adjustments enhance the initial charge/discharge efficiency of the carbon material while maintaining cost efficiency, thereby resolving the contradiction between productivity and manufacturing cost.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If conventional carbon material is used, then manufacturing simplicity is maintained, but battery capacity is reduced

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidbattery capacity

Core Design Contradiction:

Device complexityVSQuantity of substance

Solution Approach 1:

The patent applies parameter changes by controlling the interplanar spacing (d002) to 0.336 nm to less than 0.350 nm and the spring-back ratio to 13% or more. These parameter optimizations increase the battery capacity of carbon-based negative electrodes while maintaining manufacturing simplicity, effectively resolving the contradiction between device complexity and quantity of substance.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20240055602A1Negative electrode for all-solid-state battery, all-solid-state battery, and negative-electrode active material for all-solid-state battery

Publication Date: 2024.02.15 RESONAC CORP

AI summary

A negative electrode for an all-solid-state battery, the negative electrode comprising a negative-electrode active material and a solid electrolyte,the negative-electrode active material comprising a carbon material that has an interplanar spacing (d002) of from 0.336 nm to less than 0.350 nm and a spring-back ratio of 13% or more.