Lithium Electrode Protective Layer Dendrite Suppression

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Solution Overview

Problem

Lithium electrodes face stability issues due to reactivity and the formation of lithium dendrites, which can lead to short circuits in lithium batteries, necessitating improvements in both electrode stability and battery performance.

Innovation Solution

A lithium electrode with a protective layer containing a lithium ion conductive polymer featuring functional groups like —SO3Li, —COOLi, and —OLi is developed, which enhances stability and suppresses dendrite growth by improving lithium ion conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If lithium metal is used as an electrode to improve battery capacity, then energy density is improved, but lithium dendrites are formed causing short circuits and reducing safety

Engineering Contradiction:

Improveenergy densityVSAvoidsafety

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

A protective layer comprising a lithium ion conductive polymer is introduced as an intermediary between the lithium electrode and the electrolyte. This protective layer acts as a mediator that allows lithium ion transport while preventing direct contact between lithium metal and electrolyte, thereby suppressing dendrite formation and improving safety without compromising energy density

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The protective layer is constructed from composite materials including lithium ion conductive polymers with specific functional groups (—SO3Li, —COOLi, or —OLi). This composite structure combines the high ionic conductivity needed for battery performance with the mechanical properties required to suppress dendrite growth, resolving the contradiction between energy density and safety

Inventive Principle:

Principle #40Composite materials

2Quantity of substance

If lithium metal is used as an electrode, then battery capacity is improved, but electrode stability deteriorates due to high reactivity

Engineering Contradiction:

Improvebattery capacityVSAvoidelectrode stability

Core Design Contradiction:

Quantity of substanceVSStability of the object's composition

Solution Approach 1:

The lithium ion conductive polymer protective layer serves as a stable intermediary that shields the highly reactive lithium metal from the electrolyte and environment. This mediator maintains electrode stability by preventing unwanted side reactions while still allowing lithium ions to pass through for capacity delivery

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The protective layer changes the interfacial parameters between lithium and electrolyte by introducing specific functional groups (—SO3Li, —COOLi, or —OLi) that modify the chemical environment. This parameter change stabilizes the electrode interface while maintaining the electrochemical performance needed for high battery capacity

Inventive Principle:

Principle #35Parameter changes

3Reliability

If a protective layer is added to suppress dendrites, then safety is improved, but lithium ion conductivity may be reduced

Engineering Contradiction:

ImprovesafetyVSAvoidlithium ion conductivity

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

The protective layer's lithium ion conductivity is optimized by changing the chemical parameters of the polymer, specifically incorporating functional groups (—SO3Li, —COOLi, or —OLi) at controlled ratios. These parameter changes ensure the protective layer maintains high ionic conductivity (≥10^-5 S/cm) while providing adequate mechanical protection against dendrites

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The protective layer uses composite polymer materials that combine segments with different functions: some segments provide mechanical strength and dendrite suppression, while others provide high ionic conductivity. This composite approach balances safety and power requirements without compromising either property

Inventive Principle:

Principle #40Composite materials

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 improves the stability and durability of lithium electrodes, prevents short circuits, and extends the lifetime and stability of lithium batteries by effectively blocking dendrite formation.

Implementation Method 1

a protective layer which is provided on at least one surface of the electrode layer and includes a lithium ion conductive polymer including at least one functional group selected from —SO3Li, —COOLi, and —OLi

Methodology Applied

Scientific EffectIon conduction: Conduction (electrical)