Modified Mesoporous Carbon Anode for All-Solid Battery

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Solution Overview

Problem

All-solid secondary batteries face challenges with short-circuits and reduced battery capacity due to lithium deposition into the solid electrolyte layer, and existing anode materials provide limited contact area and slow lithium diffusion, affecting safety and performance.

Innovation Solution

Incorporating a modified ordered mesoporous carbon with an oxygen content of 3-10 atomic percent into the anode layer, which enhances lithophilicity and lithium diffusion, preventing short-circuits and improving discharge capacity and high-rate characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If lithium is deposited on the anode layer by charging, then battery capacity is improved, but lithium grows into the solid electrolyte layer causing short-circuit and reduced capacity

Engineering Contradiction:

Improvebattery capacityVSAvoidshort-circuit prevention

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent applies local quality by creating a modified ordered mesoporous carbon layer with specific oxygen content (3-10 atomic percent) at the anode surface. This localized modification with oxygen-containing functional groups creates a region with enhanced lithophilicity that selectively captures lithium, preventing its growth into the solid electrolyte while maintaining high capacity.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The modified ordered mesoporous carbon acts as an intermediary layer between the anode and solid electrolyte. This intermediate structure with controlled oxygen content facilitates uniform lithium deposition and provides a buffer that prevents direct contact between deposited lithium and the solid electrolyte, thereby preventing short-circuits.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If conventional anode materials are used, then manufacturing is simple, but contact area with lithium is limited and lithium diffusion is slow

Engineering Contradiction:

Improveanode manufacturing simplicityVSAvoidlithium diffusion rate

Core Design Contradiction:

Ease of manufactureVSSpeed

Solution Approach 1:

The patent employs porous materials by using ordered mesoporous carbon with a well-defined pore structure. The porosity provides extensive surface area and multiple pathways for lithium diffusion, dramatically increasing the contact area between lithium and the anode material while maintaining ease of manufacturing through conventional coating processes.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The patent applies parameter changes by controlling the oxygen content of the ordered mesoporous carbon surface within a specific range (3-10 atomic percent). This parameter optimization enhances lithophilicity and improves lithium diffusion kinetics without complicating the manufacturing process, as the modification can be achieved through controlled thermal treatment.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If oxygen content of modified ordered mesoporous carbon is increased, then lithophilicity and lithium diffusion are enhanced, but manufacturing precision requirements increase

Engineering Contradiction:

Improvelithium deposition uniformityVSAvoidoxygen content control precision

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent applies parameter changes by establishing a specific oxygen content range (3-10 atomic percent) for the modified ordered mesoporous carbon. This parameter optimization enhances lithophilicity and lithium diffusion while maintaining manufacturing feasibility through controlled thermal treatment in oxidizing atmospheres, balancing performance improvement with manufacturing precision requirements.

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 modified ordered mesoporous carbon with controlled oxygen content facilitates uniform lithium deposition and diffusion, increasing discharge capacity and lifespan while preventing short-circuits, thus enhancing the safety and performance of all-solid secondary batteries.

Implementation Method 1

a modified ordered mesoporous carbon, and an oxygen content of a surface of the modified ordered mesoporous carbon is about 3 atomic percent to about 10 atomic percent... facilitates uniform lithium deposition and diffusion

Methodology Applied

Scientific EffectLithium diffusion: Diffusion

Implementation Method 2

thermally treating the ordered mesoporous carbon in an oxidizing atmosphere to prepare a modified ordered mesoporous carbon... an oxygen content of a surface of the modified ordered mesoporous carbon is about 3 atomic percent to about 10 atomic percent

Methodology Applied

Scientific EffectSurface oxidation: Oxidation

Data Source

PatentUS20230009297A1All-solid secondary battery and method of manufacturing all-solid secondary battery

Publication Date: 2023.01.12 SAMSUNG ELECTRONICS CO LTD

AI summary

An all-solid secondary battery includes: a cathode layer; an anode layer; and a solid electrolyte between the cathode layer and the anode layer, wherein the anode layer includes an anode current collector and a first anode active material layer on the anode current collector, the first anode active material layer includes a modified ordered mesoporous carbon, and an oxygen content of a surface of the modified ordered mesoporous carbon is about 3 atomic percent to about 10 atomic percent, based on a total content of the surface, when determined by an X-ray photoelectron spectroscopy spectrum of the surface of the modified ordered mesoporous carbon.