Battery Cell Chemistry for Thermal Stability Without Ni-Rich Cathodes

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Solution Overview

Problem

Battery cells with nickel-rich cathode active materials are expensive and thermally unstable due to the use of nickel and cobalt, leading to thermal instability and potential thermal runaway events.

Innovation Solution

The use of LiMnxFe1-x-yMyPO4 as the cathode active material and anode electrodes comprising graphite and lithiated silicon oxide (LSO) or silicon-carbon (Si—C) in lithium-ion battery cells, which are cobalt- and nickel-free, enhancing thermal stability and reducing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If nickel-rich cathode active materials are used, then capacity and energy density are improved, but thermal stability deteriorates and cost increases

Engineering Contradiction:

ImprovecapacityVSAvoidthermal stability

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters of the cathode material by using LiMnxFe1-x-yMyPO4 with specific ranges of x and y values, replacing nickel-rich compositions with iron-based materials doped with metals M to achieve both high capacity and thermal stability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite cathode material LiMnxFe1-x-yMyPO4 combining multiple metal elements (Mn, Fe, and dopant M) to achieve synergistic effects that provide both high capacity and thermal stability, avoiding the use of nickel-rich single-phase materials

Inventive Principle:

Principle #40Composite materials

2Quantity of substance

If nickel-rich cathode active materials are used, then capacity and energy density are improved, but manufacturing cost increases

Engineering Contradiction:

ImprovecapacityVSAvoidcost

Core Design Contradiction:

Quantity of substanceVSEase of manufacture

Solution Approach 1:

The patent replaces expensive nickel and cobalt materials with cheaper iron-based materials (LiMnxFe1-x-yMyPO4), using abundant and low-cost metal dopants to achieve high capacity at reduced manufacturing cost

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent optimizes the stoichiometric parameters (x and y values) of the LiMnxFe1-x-yMyPO4 composition to maximize capacity while using cost-effective metal dopants, achieving economical high-performance cathode material

Inventive Principle:

Principle #35Parameter changes

3Use of energy by moving object

If nickel-rich cathode active materials are used, then energy density is improved, but thermal runaway resistance deteriorates

Engineering Contradiction:

Improveenergy densityVSAvoidthermal runaway resistance

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition to LiMnxFe1-x-yMyPO4 with optimized x and y parameters, using iron-based materials with inherent thermal stability to achieve high energy density while resisting thermal runaway

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the potential harm of high-capacity nickel-rich materials (thermal instability) into benefit by using iron-based materials that naturally provide thermal stability while maintaining high capacity through metal doping and composition optimization

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 battery cells exhibit high thermal stability, enhanced safety, and improved cycling performance with a 40% lower cost compared to commercial Ni-rich cathode cells, offering fast charge capability and excellent discharge rate and life cycle performance.

Implementation Method 1

cathode electrodes each including a cathode active material layer arranged on a cathode current collector. The cathode active material layer comprises a cathode active material including LiMnxFe1-x-yMyPO4

Methodology Applied

Scientific EffectElectrochemical reactions:

Implementation Method 2

anode electrodes each including an anode active material layer arranged on an anode current collector. The anode active material layer comprises an anode active material including graphite and at least one of lithium silicon oxide (LSO) and silicon-carbon (Si—C)

Methodology Applied

Scientific EffectElectrochemical reactions:

Data Source

PatentUS20250239608A1High thermal stability and low cost battery cells

Publication Date: 2025.07.24 GM GLOBAL TECHNOLOGY OPERATIONS LLC

AI summary

A battery cell includes C cathode electrodes each including a cathode active material layer arranged on a cathode current collector. The cathode active material layer comprises a cathode active material including LiMnxFe1-x-yMyPO4, where x and y are less than one and M includes one or more metal dopants. A anode electrodes each including an anode active material layer arranged on an anode current collector. The anode active material layer comprises an anode active material including graphite and at least one of lithium silicon oxide (LSO) and silicon-carbon (Si—C) and S separators, where C, A and S are integers greater than one.