Brookite TiO2 Coated Cathode for Battery Reaction Resistance

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Solution Overview

Problem

Current nonaqueous electrolyte secondary batteries, particularly those using TiO2-coated positive electrode active materials, face challenges in reducing reaction resistance, which limits their output characteristics.

Innovation Solution

The use of brookite type TiO2 coatings on lithium nickel cobalt manganese type composite oxide positive electrode active materials, achieved through mechanochemical processing, to intersperse on the surface of the active material, reducing reaction resistance and enhancing output characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If TiO2 coating is applied to positive electrode active material, then output characteristic is improved, but reaction resistance is not sufficiently reduced

Engineering Contradiction:

Improveoutput characteristicVSAvoidreaction resistance

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The patent changes the crystal structure parameter of TiO2 from conventional anatase or rutile types to the brookite type. This parameter change in the coating material's crystal structure leads to significantly reduced reaction resistance while maintaining improved output characteristics, resolving the contradiction between power and reliability.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If coating coverage is increased to reduce reaction resistance, then output characteristic improves, but electron conductivity may be affected

Engineering Contradiction:

Improvereaction resistanceVSAvoidelectron conductivity

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

The patent applies coating with a specific coverage range (0.05-4.5%) rather than uniform full coverage. This local quality approach ensures sufficient reaction resistance reduction while maintaining electron conductivity by avoiding excessive coating that would impede electron transport.

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If conventional TiO2 coating methods are used, then manufacturing process is simple, but reaction resistance reduction is insufficient

Engineering Contradiction:

Improvecoating process simplicityVSAvoidreaction resistance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent replaces conventional chemical vapor deposition or atomic layer deposition methods with mechanochemical processing. This substitution maintains manufacturing simplicity while achieving superior reaction resistance reduction through the brookite type TiO2 coating.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 brookite type TiO2 coating effectively reduces reaction resistance and improves the output characteristics of nonaqueous electrolyte secondary batteries, particularly lithium ion secondary batteries, by facilitating faster Li ion extraction and insertion, as confirmed by X-ray absorption fine structure analysis and XPS measurements.

Implementation Method 1

facilitating faster Li ion extraction and insertion

Methodology Applied

Scientific EffectIon extraction and insertion: Ion Exchange

Implementation Method 2

X-ray absorption fine structure analysis

Methodology Applied

Scientific EffectX-ray absorption fine structure: X-Ray

Implementation Method 3

XPS measurements

Methodology Applied

Scientific EffectX-ray photoelectron spectroscopy: X-Ray

Data Source

PatentUS20220181611A1Coated active material and nonaqueous electrolyte secondary battery using coated active material

Publication Date: 2022.06.09 PRIME PLANET ENERGY & SOLUTIONS INC

AI summary

A positive electrode active material is provided, which is a positive electrode active material having a coating of TiO2 and being able to reduce the reaction resistance. The coated active material herein disclosed includes a positive electrode active material, and a coating interspersed on a surface of the positive electrode active material. In the coated active material herein disclosed, the coating includes brookite type TiO2.