Silicon-Carbon Anode Composition With Low-Orientation Carbon

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Silicon-based anode active materials in lithium secondary batteries increase current density on carbon-based anode active materials, reducing durability and lifespan due to deteriorated resistance characteristics.

Innovation Solution

An anode active material composition combining carbon-based and silicon-based materials, where the carbon-based material has a low orientation (I004/I110) and includes SiC or SiOx with a porous structure and silicon-based coating, ensuring improved intercalation and deintercalation of lithium ions while maintaining durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If silicon-based anode active material is applied to increase discharge capacity, then energy density is improved, but current density on carbon-based anode active material increases and durability deteriorates

Engineering Contradiction:

Improvedischarge capacityVSAvoiddurability

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent changes the orientation parameter of carbon-based anode active material by controlling the I004/I110 ratio to be 2.85 or less, which modifies the crystal structure arrangement to reduce current density concentration and improve durability while maintaining high capacity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite anode active material composition containing both carbon-based anode active material and silicon-based anode active material, combining the high capacity of silicon with the stability of carbon to achieve both high energy density and durability

Inventive Principle:

Principle #40Composite materials

2Quantity of substance

If silicon-based anode active material is applied to achieve high capacity, then energy density is improved, but resistance characteristics deteriorate

Engineering Contradiction:

Improvedischarge capacityVSAvoidresistance characteristics

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent modifies the crystal orientation parameter (I004/I110 ≤ 2.85) of carbon-based anode active material to optimize electron and ion transport pathways, reducing resistance while maintaining high capacity from silicon-based materials

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The composite structure of carbon-based and silicon-based anode active materials provides both high capacity (from silicon) and good resistance characteristics (from optimized carbon structure), resolving the trade-off between capacity and resistance

Inventive Principle:

Principle #40Composite materials

3Quantity of substance

If silicon-based anode active material is applied to increase discharge capacity, then energy density is improved, but lifespan characteristics deteriorate

Engineering Contradiction:

Improvedischarge capacityVSAvoidlifespan

Core Design Contradiction:

Quantity of substanceVSDuration of action of stationary object

Solution Approach 1:

The patent optimizes the crystal orientation parameter of carbon-based anode active material (I004/I110 ≤ 2.85) to reduce mechanical stress and improve structural stability during charge-discharge cycles, thereby extending lifespan while maintaining high capacity from silicon-based materials

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The composite anode active material combines silicon-based high-capacity material with optimally oriented carbon-based material, where the carbon matrix provides structural stability and long cycle life while silicon provides high discharge capacity

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 composition enhances the resistance and lifespan characteristics of lithium secondary batteries by suppressing volume expansion and improving initial charge/discharge efficiency, even with increased silicon-based material content.

Implementation Method 1

improving intercalation and deintercalation of lithium ions

Methodology Applied

Scientific EffectIntercalation: Absorption (physical)

Implementation Method 2

the silicon-based anode active material may include SiC having a porous structure

Methodology Applied

Scientific EffectPorous structure: Porosity

Data Source

PatentEP4489107A1Anode active material composition for lithium secondary battery and anode electrode and lithium secondary battery including the same

Publication Date: 2025.01.08 SK ON CO LTD

AI summary

An anode active material composition for a lithium secondary battery includes a carbon-based anode active material and a silicon-based anode active material, wherein the carbon-based anode active material has an orientation (I004/I110, here, I004 is a peak intensity of the (004) plane when measuring X-ray diffraction (XRD) of the carbon-based anode active material, and I110 is a peak intensity of the (110) plane when measuring XRD of the carbon-based anode active material) of 2.85 or less measured by XRD.