Lithium Battery Cathode Materials via Composite Encapsulation

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Solution Overview

Problem

Existing lithium battery cathode materials suffer from poor electrical and thermal properties, making them unsuitable for high-demand applications like electric vehicles due to vulnerability to electrolytic reactions.

Innovation Solution

A cathode material comprising lithium metal phosphate salts and lithium transition metal oxides, encapsulated by lithium metal phosphate salts, with a binder and conductive additives, enhancing particle homogeneity and conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional cathode materials are used, then manufacturing simplicity is maintained, but coating quality is poor and vulnerable to electrolytic reactions

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidcoating quality

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies preliminary action by pre-forming the metal intercalation compound structure before final cathode material assembly. This pre-formed structure ensures proper coating quality and protects against electrolytic reactions from the outset, rather than attempting to correct coating issues after manufacturing.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The metal intercalation compound acts as an intermediary layer between the lithium phosphate and the electrolyte. This intermediary structure improves coating quality and provides a protective barrier that prevents direct contact between the cathode material and electrolyte, thereby reducing vulnerability to electrolytic reactions.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If cathode materials with poor coating quality are used, then manufacturing cost is reduced, but electrical and thermal properties deteriorate

Engineering Contradiction:

Improvemanufacturing costVSAvoidelectrical and thermal properties

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent employs composite materials where the metal intercalation compound component enhances both electrical and thermal properties while maintaining manufacturing feasibility. The composite structure provides superior performance characteristics without requiring excessively complex or costly manufacturing processes.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies local quality by concentrating the performance-enhancing metal intercalation compound in specific regions or as a coating layer on the cathode material surface. This localized enhancement improves electrical and thermal properties where they are most needed, without requiring uniform modification throughout the entire material structure, thereby controlling manufacturing costs.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP2243181B1Cathode materials for lithium batteries

Publication Date: 2015.05.06 BYD CO LTD

AI summary

Described are cathode materials for lithium batteries. Better cathode materials may be produced by mixing at least two compounds and a binder additive. The first compound includes one or more salts of lithium metal phosphorous while the second compound includes one or more lithium transition metal oxides. In other instances, a conductive additive may also be incorporated. The cathode materials so produced exhibit enhanced electrical properties and thermal stability.