All-Solid-State Battery Anode Alloy Deposition Layer

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Solution Overview

Problem

All-solid-state batteries face challenges in ion and electron transfer at the interface between materials, particularly in graphite-based materials, leading to inefficient lithium ion conductivity and storage properties, which affects energy density and lifespan.

Innovation Solution

An anode with a deposition layer of metals that can form alloys with lithium, such as silver, magnesium, or silicon, is applied to a carbon-based material, enhancing lithium ion conductivity and storage properties by forming a stable alloy on at least 90% of the surface, with a sulfide-based solid electrolyte and a binder, improving the interface with the solid electrolyte.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If graphite-based materials are used as anode active material, then energy density can be improved, but lithium ion conductivity and storage properties deteriorate due to interface transfer issues

Engineering Contradiction:

Improveenergy densityVSAvoidlithium ion conductivity

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

A deposition layer containing metal particles (such as aluminum, silicon, tin, or their alloys) is introduced as an intermediary between the graphite-based anode active material and the solid electrolyte. This deposition layer facilitates lithium ion transfer at the interface, resolving the contradiction by enabling both high energy density from graphite and reliable lithium ion conductivity through the metallic deposition layer that forms stable alloys with lithium.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Use of energy by moving object

If graphite-based materials are used as anode active material, then energy density can be improved, but storage properties deteriorate due to interface transfer issues

Engineering Contradiction:

Improveenergy densityVSAvoidstorage properties

Core Design Contradiction:

Use of energy by moving objectVSDuration of action of moving object

Solution Approach 1:

The deposition layer of metal particles serves as a mediator that enables reversible intercalation and deintercalation of lithium ions at the interface between graphite and solid electrolyte. This resolves the contradiction by providing stable alloy formation that maintains storage properties while preserving the high energy density benefits of graphite-based materials.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If solid electrolyte is used to replace liquid electrolyte, then safety is improved, but ion and electron transfer at interface becomes problematic

Engineering Contradiction:

ImprovesafetyVSAvoidion and electron transfer

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The deposition layer of metal particles acts as an intermediary that enables efficient ion and electron transfer at the interface between the solid electrolyte and graphite anode. This resolves the contradiction by maintaining the safety advantages of solid electrolyte while overcoming the interface transfer problem through the metallic deposition layer that forms stable alloys with lithium.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The deposition layer changes the physical and chemical parameters at the interface, including electrical conductivity and lithium ion diffusion coefficient. By introducing metal particles with favorable electrochemical properties, the interface parameters are optimized to enable smooth ion and electron transfer while maintaining solid electrolyte safety.

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 solution significantly enhances lithium ion conductivity and storage properties, leading to improved energy density and extended lifespan of the battery by stabilizing the alloy layer and reducing side reactions at the interface.

Implementation Method 1

a deposition layer including a metal that can form an alloy with lithium and formed on at least a portion of the surface of the carbon-based material

Methodology Applied

Scientific EffectAlloy formation:

Implementation Method 2

a reversible reaction of intercalation and deintercalation of lithium ions is required in the process

Methodology Applied

Scientific EffectIntercalation and deintercalation:

Implementation Method 3

a solid electrolyte replaces the roles of the separator and a liquid electrolyte

Methodology Applied

Scientific EffectIon transport:

Implementation Method 4

since the solid electrolyte theoretically has faster ion transfer properties than the liquid electrolyte

Methodology Applied

Scientific EffectFast ion transfer: Fast Ion Conductor

Implementation Method 5

electrons and ions are transferred through the interparticle interface

Methodology Applied

Scientific EffectElectron transfer: Conduction (electrical)

Implementation Method 6

The solution significantly enhances lithium ion conductivity and storage properties, leading to improved energy density and extended lifespan of the battery by stabilizing the alloy layer

Methodology Applied

Scientific EffectInterface stabilization:

Data Source

PatentUS20230133463A1Anode for all-solid-state battery and manufacturing method thereof

Publication Date: 2023.05.04 HYUNDAI MOTOR CO LTD

AI summary

Disclosed are an anode for an all-solid-state battery including an anode active material in which a metal that can form an alloy with lithium is deposited on all or a portion of the surface of a carbon-based material, and a method for manufacturing the same.