Core-Shell Silicon Anode Composition for Fast-Charging Stability

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current anode materials, such as carbon or graphite, face structural instability and safety issues due to rapid ion intercalation and deintercalation, leading to irreversible collapse and lithium dendrite formation, which reduces battery capacity and safety, especially in high current densities, and cannot meet the energy demands of large electric devices.

Innovation Solution

A core-shell structure is developed, where a core material, such as a structural element oxide, is surrounded by a modified silicon material and polymer shell, enhancing mechanical stability, conductivity, and safety through self-assembly, with specific particle diameter and covering ratio optimizations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If carbon or graphite anode materials are used, then the battery structure is stable, but the structural stability deteriorates under rapid ion intercalation and deintercalation at high current densities

Engineering Contradiction:

Improveanode structural stabilityVSAvoidbattery safety and capacity

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent uses a composite anode structure combining silicon material (for high energy density) with carbon material (for structural stability). The silicon particles are embedded in a carbon matrix, allowing the carbon to provide structural support while silicon provides high capacity, thus resolving the contradiction between structural stability and battery performance

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent employs a carbon coating layer as a flexible shell around silicon particles. This carbon shell accommodates the volume expansion of silicon during lithium insertion while maintaining structural integrity, preventing the irreversible collapse that occurs with rigid graphite structures under high current densities

Inventive Principle:

Principle #30Flexible shells and thin films

2Speed

If high current density is applied for fast charging, then the charging speed increases, but lithium dendrite forms on the electrode surface

Engineering Contradiction:

Improvecharging speedVSAvoidlithium dendrite formation

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The patent creates local quality differences by providing carbon-rich regions around silicon particles where lithium insertion occurs preferentially. This localized carbon structure provides stable nucleation sites for lithium deposition, preventing dendrite formation in high current density regions while allowing fast charging in other areas

Inventive Principle:

Principle #3Local quality

3Quantity of substance

If silicon material is added to increase energy density, then the theoretical energy density increases, but the anode volume changes extremely and material cracks during charge-discharge cycles

Engineering Contradiction:

Improveenergy densityVSAvoidanode structural stability

Core Design Contradiction:

Quantity of substanceVSStability of the object's composition

Solution Approach 1:

The patent divides the silicon anode into small discrete particles embedded in a carbon matrix, rather than using bulk silicon. This segmentation limits the volume expansion to small localized regions that can be accommodated by the surrounding carbon structure, preventing catastrophic cracking while maintaining high energy density through increased silicon content

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements a nested structure where silicon particles are embedded within carbon matrix structures. The carbon structure acts as a container that accommodates silicon volume changes, allowing the high-energy-density silicon to be nested within a structurally-stable carbon framework

Inventive Principle:

Principle #7Nested doll (Nesting)

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 core-shell structure improves battery stability, safety, and energy density, enabling fast charging and maintaining structural integrity under high current densities, reducing irreversible capacity loss and enhancing overall battery performance.

Implementation Method 1

Methodology Applied

Scientific EffectSelf-assembly: Self-Assembly

Implementation Method 2

the carbon or graphite, which mostly has a layered structure, cannot withstand the rapid intercalation and deintercalation of ions

Methodology Applied

Scientific EffectIntercalation: Absorption (physical)

Implementation Method 3

when a battery, in which silicon material is added, undergoes several charge-discharge cycles, the anode volume will extremely change and the material will even crack because the lithium ions are repeatedly intercalated and moved out from the silicon materials

Methodology Applied

Scientific EffectVolume stabilization:

Data Source

PatentUS20260074195A1Composition, anode and battery

Publication Date: 2026.03.12 LARGAN MEDICAL CO LTD

AI summary

A composition includes a core-shell structure. The core-shell structure includes a core material and a shell material. The shell material is farther away from a center of the core-shell structure than the core material. The core material includes a structural element oxide. The structural element oxide includes a structural element. The structural element includes at least two selected from the group consisting of lithium, titanium, niobium, cobalt, copper, tin, silicon, iron, manganese and nickel. The shell material includes a mixed material. The mixed material includes a modified silicon material. The modified silicon material includes a silicon material and a polymer.