Silicon-Oxygen Anode Coating for Swelling and Cycle Stability

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Solution Overview

Problem

Silicon-based anode materials for lithium-ion batteries face challenges such as high expansion, severe volume changes, and low initial coulombic efficiency, limiting their widespread application.

Innovation Solution

A silicon-oxygen composite anode material with a composite coating layer comprising carbon and a lithium-containing compound, where the lithium-containing compound is embedded in the pores of the carbon layer, stabilizing the material and enhancing lithium ion conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If a single carbon material coating is used, then the conductivity of the material is improved, but the mechanical strength and swelling inhibition are insufficient

Engineering Contradiction:

ImproveconductivityVSAvoidmechanical strength

Core Design Contradiction:

Loss of energyVSStrength

Solution Approach 1:

The patent uses a composite coating layer comprising carbon material and lithium-containing compound coating the silicon-oxygen material surface. The carbon material provides conductivity while the lithium-containing compound enhances mechanical strength and swelling inhibition, resolving the contradiction between conductivity and mechanical strength through material composition rather than single material reliance.

Inventive Principle:

Principle #40Composite materials

2Reliability

If titanium dioxide coating is used, then the initial coulombic efficiency is improved, but the coating cost and process complexity increase

Engineering Contradiction:

Improveinitial coulombic efficiencyVSAvoidcoating process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Instead of using expensive and complex titanium dioxide coating processes, the patent employs a composite coating of carbon material and lithium-containing compound that can be applied through simpler methods such as chemical vapor deposition or atomic layer deposition, achieving improved initial coulombic efficiency while reducing process complexity and cost.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the coating material parameters from titanium dioxide to carbon-lithium compound composite, and adjusts coating thickness parameters (5-50 nm) to optimize performance while simplifying the coating process and reducing costs.

Inventive Principle:

Principle #35Parameter changes

3Speed

If the coating layer is made thinner to improve lithium ion migration, then the conductivity improves, but the mechanical strength and protection capability decrease

Engineering Contradiction:

Improvelithium ion migration speedVSAvoidcoating layer mechanical strength

Core Design Contradiction:

SpeedVSStrength

Solution Approach 1:

The composite coating layer combines carbon material (providing conductivity and flexibility) with lithium-containing compound (providing mechanical strength). This composition allows the coating to maintain adequate thickness for protection while enabling efficient lithium ion migration, as the lithium-containing compound creates favorable pathways for ion transport.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The coating layer exhibits local quality differentiation where the carbon material provides conductive pathways and the lithium-containing compound provides mechanical strength and ion migration channels. This spatial distribution of different material properties allows simultaneous optimization of mechanical strength and lithium ion migration speed within the same coating structure.

Inventive Principle:

Principle #3Local quality

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 composite coating layer inhibits particle pulverization, improves electrical conductivity, and enhances cyclic performance and initial coulombic efficiency, extending the lifespan and reducing production costs of lithium-ion batteries.

Implementation Method 1

The carbon material has pores, and the lithium-containing compound is filled in the pores

Methodology Applied

Scientific EffectPore filling: Absorption (physical)

Implementation Method 2

the lithium-containing compound in the composite coating layer isolates the silicon-oxygen material from direct contact with the electrolyte

Methodology Applied

Scientific EffectPhysical isolation: Physical Containment

Implementation Method 3

the composite coating layer ensures good electrical conductivity, which can greatly improve the ability of active silicon oxide to obtain electrons, improve the efficiency of lithium de-intercalation and intercalation

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS12620580B2Silicon-oxygen composite anode material, preparation method thereof and lithium-ion battery

Publication Date: 2026.05.05 BTR NEW MATERIAL GRP CO LTD

AI summary

The present application relates to a silicon-oxygen composite anode material and the preparation method thereof, and a lithium-ion battery. Wherein the silicon-oxygen composite anode material comprises a silicon-oxygen material and a composite coating layer coating the surface of the silicon-oxygen material. The composite coating layer comprises a carbon material and a lithium-containing compound, the carbon material has pores, and the lithium-containing compound is filled in the pores. The silicon-oxygen composite anode material and the preparation method thereof are simple and low cost, which is also easy to conduct industrial production, moreover, the prepared silicon-oxygen composite anode material has excellent electrochemical cycle and expansion inhibition performance, which can prolong the life-span of a lithium ion battery.