Transition Metal Oxide Cathode Coating for LMR Cycle Life

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Lithium- and manganese-rich (LMR) battery cathode electrodes face limited cycle life due to detrimental reactions at the cathode-electrolyte interface, leading to capacity fading and voltage decay.

Innovation Solution

A coating layer comprising transition metal oxides, such as lithium molybdate, is applied to the cathode active material particles to form a self-limiting barrier that reduces interactions at the cathode-electrolyte interface, improving cycle life and ionic conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a coating layer is applied to cathode active material particles, then discharge capacity retention and cycle life are improved, but manufacturing complexity increases

Engineering Contradiction:

Improvecycle lifeVSAvoidcoating process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

A coating layer comprising transition metal oxides (such as lithium molybdate, lithium tungstate, lithium vanadate, lithium chromate, ammonium tungstate, ammonium molybdate, ammonium vanadate, ammonium chromate, potassium tungstate, potassium molybdate, potassium vanadate, potassium chromate, sodium tungstate, sodium molybdate, sodium vanadate, or sodium chromate) is applied to the surface of cathode active material particles. This intermediate layer acts as a protective barrier between the cathode material and electrolyte, reducing detrimental reactions at the cathode-electrolyte interface while maintaining ionic conductivity, thereby significantly enhancing discharge capacity retention and cycle life without requiring complex multi-step manufacturing processes

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs a water-based coating process where transition metal oxide precursors are dissolved in water to form an aqueous solution. The coating is applied by immersing cathode active material particles in this solution, followed by drying and calcination at controlled temperatures (typically 400-600°C). By adjusting parameters such as precursor concentration, immersion time, and calcination temperature, the coating thickness and composition can be precisely controlled to optimize both performance and manufacturing simplicity

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a coating layer is applied to cathode active material particles, then discharge capacity retention is improved, but manufacturing cost increases

Engineering Contradiction:

Improvedischarge capacity retentionVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The use of water-based precursor solutions containing transition metal oxides provides a cost-effective coating approach. The precursors (such as lithium molybdate, lithium tungstate, ammonium vanadate, etc.) are commercially available at reasonable costs, and the water-based formulation eliminates the need for expensive organic solvents. The coating process uses simple immersion and drying techniques rather than complex vacuum deposition or atomic layer deposition equipment, significantly reducing manufacturing costs while achieving excellent discharge capacity retention

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent utilizes inexpensive transition metal oxide precursors that can be easily sourced and applied in aqueous solutions. These precursor materials are consumed in the coating process to form the protective layer, and their low cost allows for scalable production without significant expense. The simplicity of the water-based approach makes it economically viable for large-scale battery manufacturing

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 coating layer significantly enhances discharge capacity retention and cycle life of LMR cathode electrodes by mitigating detrimental reactions, while maintaining good ionic conductivity and being compatible with a low-cost, water-based coating process.

Implementation Method 1

A coating layer is formed on an outer surface of the particles of the cathode active material and including one or more transition metal oxides

Methodology Applied

Scientific EffectPhysical barrier formation: Coatings

Implementation Method 2

improving cycle life and ionic conductivity

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS20250015266A1Cathode active material with coating layer including a transition metal oxide for cathode electrodes

Publication Date: 2025.01.09 GM GLOBAL TECHNOLOGY OPERATIONS LLC

AI summary

A cathode active material layer for a cathode electrode of a battery cell, comprising particles of cathode active material including one or more materials selected from a group consisting of a lithium- and manganese-rich (LMR) material, lithium nickel manganese cobalt oxide (NMC), lithium nickel manganese cobalt aluminum oxide (NMCA), and lithium iron phosphate (LFP). A coating layer is formed on an outer surface of the particles of the cathode active material and including one or more transition metal oxides.