Metal Oxide Cathode Coatings for LMR Capacity and Cycle Stability

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Solution Overview

Problem

Existing battery cell technologies face challenges in enhancing the cycling stability and specific capacity of cathode electrodes, particularly for lithium- and manganese-rich (LMR) materials, due to detrimental reactions at the cathode-electrolyte interface.

Innovation Solution

A method involving the use of one or more organic isopropoxide precursors to form single-, bi-, or multi-metal oxide coatings on particles of cathode active material, which are then calcined to improve the structural integrity and electrochemical performance of the cathode electrodes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If lithium- and manganese-rich (LMR) cathode active material is used to increase specific capacity, then the specific capacity is improved, but the cycling stability deteriorates due to detrimental reactions at the cathode-electrolyte interface

Engineering Contradiction:

Improvespecific capacityVSAvoidcycling stability

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

A metal oxide coating layer is applied as an intermediary between the LMR cathode active material and the electrolyte. This coating layer acts as a protective barrier that prevents direct contact and detrimental reactions between the LMR material and electrolyte, thereby maintaining cycling stability while preserving the high specific capacity of the LMR material

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention creates a composite structure by combining the LMR cathode active material with a metal oxide coating layer. This composite material integrates the high capacity characteristics of LMR materials with the stability characteristics of metal oxide coatings, achieving both improved specific capacity and maintained cycling stability

Inventive Principle:

Principle #40Composite materials

2Reliability

If a metal oxide coating is applied to protect the cathode active material, then the cycling stability is improved, but the manufacturing process complexity increases

Engineering Contradiction:

Improvecycling stabilityVSAvoidmanufacturing process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The coating formation process is merged with the existing cathode electrode manufacturing process. The metal oxide precursors are incorporated into the slurry preparation and coating steps that are already part of the standard manufacturing workflow, allowing the protective coating to be applied without adding significant process complexity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention utilizes changes in processing parameters (temperature, time, concentration) during the existing manufacturing process to control the formation and composition of the metal oxide coating. By adjusting these parameters, the desired coating properties are achieved using standard manufacturing equipment and procedures

Inventive Principle:

Principle #35Parameter changes

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 method effectively enhances the discharge capacity and retention percentage of cathode active materials, particularly LMR materials, by creating a stable metal oxide coating that mitigates undesirable interactions at the cathode-electrolyte interface.

Implementation Method 1

dissolving one or more first organic isopropoxide precursors in a first solvent to form a mixture; heating and stirring the mixture to a first predetermined temperature for a first predetermined period to form a first metal oxide coating

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Implementation Method 2

heating and stirring the mixture to a first predetermined temperature for a first predetermined period to form a first metal oxide coating on the particles of the cathode active material

Methodology Applied

Scientific EffectCondensation: Condensation

Implementation Method 3

heating and stirring the mixture to a first predetermined temperature for a first predetermined period; heating the mixture to the first predetermined temperature

Methodology Applied

Scientific EffectHeating: Heating

Implementation Method 4

filtering the particles of the cathode active material from the mixture

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Implementation Method 5

calcining the particles of the cathode active material at a second predetermined temperature for a second predetermined period

Methodology Applied

Scientific EffectCalcination: Heat Treatment

Data Source

PatentUS20250192177A1Metal oxide and mixed metal oxide coatings on cathode active material using isopropoxide precursor

Publication Date: 2025.06.12 GM GLOBAL TECHNOLOGY OPERATIONS LLC

AI summary

A method for manufacturing a cathode electrode including a) dissolving one or more first organic isopropoxide precursors in a first solvent to form a mixture; b) adding particles of cathode active material to the mixture; c) heating and stirring the mixture to a first predetermined temperature for a first predetermined period to form a first metal oxide coating on the particles of the cathode active material; d) filtering the particles of the cathode active material from the mixture; and e) calcining the particles of the cathode active material at a second predetermined temperature for a second predetermined period.