LMR Cathode Composition for Voltage Decay and Rate Capability

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Solution Overview

Problem

Current Lithium Manganese Rich (LMR) positive electrode active materials for lithium-ion batteries suffer from issues such as voltage decay during cycling, decreased rate capability, and poor cycle performance, along with lower volumetric energy density.

Innovation Solution

Optimized LMR compositions with controlled Li, Mn, and Ni oxidation states, and optionally Co or Cr, are formulated to enhance electronic and ionic conductivity, improving cycle performance and rate capability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If LMR compositions are used to achieve high gravimetric energy density, then energy density is improved, but voltage decay during cycling occurs

Engineering Contradiction:

Improvegravimetric energy densityVSAvoidvoltage decay during cycling

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent optimizes the oxidation states of Li, Mn, and Ni by precisely controlling composition parameters (Li1.02 to 1.08, Mn0.51 to 0.52, Ni0.40 to 0.47-x) to achieve a balance between high energy density and voltage stability during cycling

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system combining Li, Mn, Ni, and dopant elements (M = Co, Cr, or combination) where the synergistic interaction between different elements improves both energy density and cycling stability

Inventive Principle:

Principle #40Composite materials

2Use of energy by moving object

If LMR compositions are used to achieve high gravimetric energy density, then energy density is improved, but rate capability decreases

Engineering Contradiction:

Improvegravimetric energy densityVSAvoidrate capability

Core Design Contradiction:

Use of energy by moving objectVSSpeed

Solution Approach 1:

The patent adjusts composition parameters including Li content (1.02 to 1.08) and Mn content (0.51 to 0.52) to optimize both energy density and ionic conductivity for improved rate capability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces dopant elements (Co, Cr) at specific locations in the crystal structure to locally enhance ionic conductivity and electronic conductivity, improving rate capability without sacrificing overall energy density

Inventive Principle:

Principle #3Local quality

3Use of energy by moving object

If LMR compositions are used to achieve high gravimetric energy density, then energy density is improved, but cycle performance is poor

Engineering Contradiction:

Improvegravimetric energy densityVSAvoidcycle performance

Core Design Contradiction:

Use of energy by moving objectVSDuration of action of stationary object

Solution Approach 1:

The patent optimizes the oxidation states and composition ratios (Li1.02 to 1.08, Mn0.51 to 0.52, Ni0.40 to 0.47-x) to simultaneously achieve high energy density and excellent cycle performance by stabilizing the crystal structure

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent develops a composite material system with Li, Mn, Ni, and dopant elements (Co, Cr) where the synergistic effects improve both energy density and long-term cycling stability

Inventive Principle:

Principle #40Composite materials

4Use of energy by moving object

If LMR compositions are used to achieve high gravimetric energy density, then energy density is improved, but volumetric energy density is lower

Engineering Contradiction:

Improvegravimetric energy densityVSAvoidvolumetric energy density

Core Design Contradiction:

Use of energy by moving objectVSQuantity of substance

Solution Approach 1:

The patent adjusts composition parameters including Li content (1.02 to 1.08) and Mn content (0.51 to 0.52) to optimize the balance between gravimetric and volumetric energy density

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 optimized compositions achieve higher specific capacity, improved power performance, and enhanced electrochemical stability, resulting in lithium-ion batteries with increased durability and efficiency.

Implementation Method 1

Optimized LMR compositions with controlled Li, Mn, and Ni oxidation states, and optionally Co or Cr, are formulated to enhance electronic and ionic conductivity

Methodology Applied

Scientific EffectElectronic conductivity enhancement:

Implementation Method 2

Optimized LMR compositions with controlled Li, Mn, and Ni oxidation states, and optionally Co or Cr, are formulated to enhance electronic and ionic conductivity

Methodology Applied

Scientific EffectIonic conductivity enhancement:

Data Source

PatentUS20250323255A1Lithium and manganese rich positive active material compositions

Publication Date: 2025.10.16 FORD GLOBAL TECH LLC

AI summary

A positive electrode active material for lithium-ion batteries may include a compound represented by a general formula 1: Li1.02 to 1.08Mn0.51 to 0.52Ni0.40 to 0.47-xCoxO2, where x ranges from 0 to 0.1. The average oxidation state of manganese is controlled to be between 3.8 and 4.0. The average oxidation state of nickel is maintained at less than 2.27. A battery may contain the positive electrode.