Coated Cathode Active Material for Battery Dispersibility and Low Resistance

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing secondary batteries face limitations in improving stability and energy density due to their composition based on organic solvents, and there is a need for a cathode active material with controlled rheological properties for enhanced performance in lithium secondary batteries.

Innovation Solution

A cathode active material for lithium secondary batteries is developed, comprising a core part with a lithium metal oxide compound and a coating layer made of an inorganic compound, such as LiNbO3, Li2ZrO3, Li3PO4, or Li2SiO3, which provides controlled rheological properties and excellent dispersibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If organic solvents are used in secondary batteries, then ease of manufacture is improved, but stability and energy density are limited

Engineering Contradiction:

Improveease of manufactureVSAvoidstability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent changes the physical state parameter of the electrolyte from liquid (organic solvent) to solid, fundamentally altering the battery system's properties. This enables simultaneous achievement of improved stability and energy density while maintaining manufacturability through the controlled rheological properties of the solid cathode active material

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a composite structure with a core part containing lithium metal oxide and a coating layer with controlled rheological properties. This composite material design enables the solid cathode active material to achieve both stability and high energy density while maintaining ease of manufacture

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If organic solvents are used in secondary batteries, then ease of manufacture is improved, but energy density is limited

Engineering Contradiction:

Improveease of manufactureVSAvoidenergy density

Core Design Contradiction:

Ease of manufactureVSUse of energy by moving object

Solution Approach 1:

The patent changes the electrolyte state from liquid to solid, enabling higher energy density through improved electron mobility and reduced internal resistance, while maintaining ease of manufacture through the composite material structure with controlled rheological properties

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The composite cathode active material with core and coating layers enables high energy density through optimized lithium ion transport pathways, while the overall composite structure maintains ease of manufacture

Inventive Principle:

Principle #40Composite materials

3Stability of the object's composition

If a coating layer is added to the core part, then dispersibility is improved, but device complexity increases

Engineering Contradiction:

ImprovedispersibilityVSAvoiddevice complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent applies local quality by adding a coating layer with controlled rheological properties only to the surface of the core part, improving dispersibility and electron mobility where needed while keeping the bulk structure simple and maintaining ease of manufacture

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20250054948A1Cathode active material having controlled rheological properties for a lithium secondary battery

Publication Date: 2025.02.13 HYUNDAI MOTOR CO LTD

AI summary

A cathode active material with controlled rheological properties for lithium secondary batteries. In particular, the cathode active material for a lithium secondary battery includes: a core part comprising a lithium metal oxide; and a coating layer covering at least a portion of a surface of the core part and comprising an inorganic compound.