Blended Lithium Cathode Materials for High Energy and Stability

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Solution Overview

Problem

Existing lithium-ion battery cathode materials face challenges such as high reliance on scarce and expensive metals like cobalt and nickel, stability issues, and energy density limitations, particularly in layered-oxide cathodes, while olivine-structured materials offer affordability and safety but lower conductivity.

Innovation Solution

A blend of lithium iron manganese phosphate and lithium layered-oxide cathode materials is developed, optimizing chemical composition for mutual compatibility and voltage overlap, reducing cobalt and nickel content, and enhancing energy density and stability by incorporating olivine-structured cathodes with manganese.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If layered-oxide cathode materials are used to achieve high energy density, then energy density is improved, but stability deteriorates and reliance on expensive cobalt and nickel increases

Engineering Contradiction:

Improveenergy densityVSAvoidstability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent combines layered-oxide cathode materials with olivine-structured phosphate materials into a blended cathode. The layered-oxide component provides high energy density while the olivine component provides stability and structural integrity. This merging allows the battery to achieve high energy density without sacrificing stability, as the two materials work synergistically to compensate for each other's weaknesses.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent creates a composite cathode material by blending layered-oxide and olivine-structured phosphate materials. This composite structure allows the battery to leverage the high energy density of layered-oxide materials while simultaneously benefiting from the stability and lower cost of olivine materials. The composite approach enables reduced cobalt and nickel content while maintaining or improving overall performance.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If olivine-structured phosphate materials are used to achieve affordability and safety, then cost and stability are improved, but ionic and electronic conductivity deteriorates

Engineering Contradiction:

ImproveaffordabilityVSAvoidconductivity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent merges olivine-structured phosphate materials with layered-oxide materials to create a blended cathode. The olivine component provides affordability and stability while the layered-oxide component compensates for the conductivity limitations. This combination allows the battery to maintain low cost and high stability while achieving acceptable conductivity levels through the synergistic effect of both materials.

Inventive Principle:

Principle #5Merging (Combining)

3Ease of manufacture

If cobalt content is reduced in layered-oxide cathodes, then cost and sustainability are improved, but energy density deteriorates

Engineering Contradiction:

ImprovecostVSAvoidenergy density

Core Design Contradiction:

Ease of manufactureVSUse of energy by moving object

Solution Approach 1:

The patent creates a composite cathode that blends reduced-cobalt layered-oxide materials with olivine-structured phosphate materials. This composite structure allows the battery to achieve lower cobalt content and reduced cost while maintaining energy density through the contribution of both material types. The olivine component compensates for any energy density loss from reduced cobalt content.

Inventive Principle:

Principle #40Composite materials

4Use of energy by moving object

If nickel content is increased to maintain energy density after cobalt reduction, then energy density is preserved, but CO2 emissions and cost increase due to synthetic nickel production

Engineering Contradiction:

Improveenergy densityVSAvoidCO2 emissions

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent employs a composite cathode structure that reduces reliance on both cobalt and nickel by combining layered-oxide materials with olivine-structured phosphate materials. This approach allows the battery to maintain energy density through the synergistic contribution of both material types while using less synthetic nickel, thereby reducing CO2 emissions and production costs associated with synthetically produced battery-grade nickel sulfate.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS20250210655A1Electrode active materials and mixed electrode active materials for lithium batteries

Publication Date: 2025.06.26 TEXPOWER EV TECHNOLOGIES INC

AI summary

Described herein are electrode active materials useful as the positive electrode in lithium or lithium-ion batteries. The disclosed electrode active materials comprise lithium phosphates uniquely suited for mixing with lithium layered oxides, as well as the resulting mixture. For example, compositions of matter are described herein. The disclosed materials exhibit high energy density with reduced cobalt and nickel content.