Composite Cathode Material With Double-Layer Cladding for Safer Energy Density

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Solution Overview

Problem

Existing lithium-ion battery cathode materials face challenges in balancing energy density and safety performance, with pure lithium manganese iron phosphate offering low conductivity and energy density, while ternary materials have poor safety performance and high costs due to rising nickel and cobalt prices.

Innovation Solution

A modified ternary and lithium manganese iron phosphate composite material is developed, where both components are doped and clad with titanium dioxide and lithium titanate layers to enhance structural stability and inhibit phase transitions, improving long-cycle performance and safety.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If pure lithium manganese iron phosphate is used as cathode material, then safety performance and cost are improved, but conductivity and energy density deteriorate

Engineering Contradiction:

Improvesafety performanceVSAvoidenergy density

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent combines lithium manganese iron phosphate and ternary materials in a composite cathode structure, merging the safety advantages of lithium manganese iron phosphate with the high energy density of ternary materials to achieve both improved safety and maintained energy density

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent creates a composite cathode material system consisting of lithium manganese iron phosphate and ternary materials, utilizing the complementary properties of each material to overcome the limitations of using either material alone

Inventive Principle:

Principle #40Composite materials

2Use of energy by moving object

If ternary material is used as cathode material, then energy density is improved, but safety performance and cost deteriorate

Engineering Contradiction:

Improveenergy densityVSAvoidsafety performance

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent optimizes the local composition and ratio of lithium manganese iron phosphate and ternary materials within the composite cathode, creating regions with different properties to balance safety and energy density requirements

Inventive Principle:

Principle #3Local quality

3Reliability

If multiple materials are mixed to balance performance and safety, then energy density and safety are improved, but structural stability and thermal stability deteriorate

Engineering Contradiction:

Improvesafety performanceVSAvoidstructural stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent applies surface modification treatments to the cathode materials before composite formation, pre-establishing stable surface structures that prevent degradation during subsequent mixing and battery operation, thereby maintaining structural stability while achieving performance balance

Inventive Principle:

Principle #10Preliminary action

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 composite material achieves optimized long-cycle performance and safety by utilizing the synergistic effect of doping and cladding, maintaining microstructure integrity and reducing interfacial side reactions, thus enhancing energy density and safety performance.

Implementation Method 1

both the ternary material and the lithium manganese iron phosphate are modified by doping and cladding, which can make use of the synergistic effect of the doping and cladding to optimize the long-cycle performance of the cathode material

Methodology Applied

Scientific EffectSurface modification:

Implementation Method 2

both the ternary material and the lithium manganese iron phosphate are modified by doping and cladding

Methodology Applied

Scientific EffectDoping: Dopants

Implementation Method 3

the synergistic effect between the cationic cladding layer formed in-situ in the double-layer cladding layer and doped metal can inhibit the occurrence of the phase transition, thus maintaining the integrity and stability of the microstructure of the material, and the metal oxide layer of the double-layer cladding layer is conducive to the reduction of the interfacial side reaction

Methodology Applied

Scientific EffectInterface protection:

Data Source

PatentUS20230420654A1Modified ternary and lithium manganese iron phosphate composite material and preparation method and application thereof

Publication Date: 2023.12.28 EVE POWER CO LTD

AI summary

The present disclosure relates to a modified ternary and lithium manganese iron phosphate composite material and a preparation method and an application thereof. The material includes a modified ternary material and a modified lithium manganese iron phosphate material that are composite; wherein the modified ternary material includes a ternary material, a ternary material double-layer cladding layer, and ternary material doped metal ions; the ternary material double-layer cladding layer includes a ternary material metal oxide layer and a ternary material cationic cladding layer; the modified lithium manganese iron phosphate material includes a lithium manganese iron phosphate material, a lithium manganese iron phosphate double-layer cladding layer, and lithium manganese iron phosphate doped metal ions; the lithium manganese iron phosphate double-layer cladding layer includes a lithium manganese iron phosphate metal oxide layer and a lithium manganese iron phosphate cationic cladding layer.