Blended LMR-LFP Cathode Composition for Lower Heat and Resistance

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Solution Overview

Problem

Existing lithium cathode chemistries for electric and hybrid-electric vehicles exhibit high heat generation and internal resistance at various states of charge, while maintaining lower discharge specific capacities.

Innovation Solution

A cathode composition comprising a blend of lithium and manganese rich (LMR) and lithium iron phosphate (LFP) materials, with specific weight percentages and layering configurations, is used to reduce heat generation and internal resistance while maintaining discharge capacity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If lithium and manganese rich (LMR) cathode chemistry is used, then discharge specific capacity is improved, but heat generation and internal resistance increase

Engineering Contradiction:
Improvedischarge specific capacityVSAvoidheat generation
Core Design Contradiction:
Quantity of substanceVSObject-generated harmful factors

Solution Approach 1:

The patent applies composite materials by combining LMR cathode material with lithium iron phosphate (LFP) material in a blended composition. The LMR component provides high discharge specific capacity while the LFP component suppresses heat generation and internal resistance, creating a composite cathode that achieves both high capacity and thermal stability

Inventive Principle:
Principle #40Composite materials

2Quantity of substance

If lithium and manganese rich (LMR) cathode chemistry is used, then discharge specific capacity is improved, but internal resistance increases

Engineering Contradiction:
Improvedischarge specific capacityVSAvoidinternal resistance
Core Design Contradiction:
Quantity of substanceVSReliability

Solution Approach 1:

The patent applies composite materials by combining LMR cathode material with lithium iron phosphate (LFP) material in a blended composition. The LMR component provides high discharge specific capacity while the LFP component suppresses heat generation and internal resistance, creating a composite cathode that achieves both high capacity and thermal stability

Inventive Principle:
Principle #40Composite materials

3Ease of manufacture

If single cathode chemistry is used, then manufacturing simplicity is maintained, but performance optimization is limited

Engineering Contradiction:
Improvemanufacturing simplicityVSAvoidperformance optimization
Core Design Contradiction:
Ease of manufactureVSReliability

Solution Approach 1:

The patent applies parameter changes by systematically varying the composition ratio of LMR to LFP materials (with LMR ranging from 1-99 wt% and LFP from 1-99 wt%), as well as adjusting layer thicknesses and domain sizes. This enables optimization of performance parameters (heat generation, internal resistance, discharge capacity) while maintaining compatibility with existing manufacturing processes

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentUS20250316684A1Blended lithium and manganese-rich (LMR) battery cells
Publication Date: 2025.10.09 GM GLOBAL TECHNOLOGY OPERATIONS LLC
  • US20250316684A1 patent drawing
  • US20250316684A1 patent drawing
  • US20250316684A1 patent drawing

AI summary

A battery cell, a battery including a battery cell, and a vehicle including a battery. The battery cell includes a cathode including a lithium and manganese rich composition and a lithium iron phosphate composition, a cathode current collector connected to the cathode, an anode, an anode current collector connected to the anode, a separator positioned between the cathode and anode, and an electrolyte contacting the anode and the cathode.