Battery Gas Getter Coating for Sealed Li-Ion Cell Pressurization

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Solution Overview

Problem

Lithium-ion batteries generate gases such as oxygen and carbon dioxide during initial charging and operational cycles, leading to internal pressurization, increased cell resistance, and performance issues due to interactions with cell components.

Innovation Solution

Incorporating a de-gassed lithium-manganese-rich battery cell with a barium oxide-based coating to convert oxygen and carbon dioxide into barium peroxide and carbonate, and using a binary metal oxide-based coating with a polymer sheath to manage gas accumulation in battery packs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the battery cell is sealed to contain internal components and electrolyte, then the battery structure is complete and functional, but gas accumulation leads to internal pressurization and performance degradation

Engineering Contradiction:

Improvebattery structure integrityVSAvoidinternal pressurization and gas accumulation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A binary metal oxide-based coating (barium oxide and magnesium oxide) is applied to interior surfaces of the battery cell as an intermediary substance. This coating chemically reacts with accumulated gases (oxygen and carbon dioxide), converting them into stable solid compounds (barium peroxide, barium carbonate, magnesium carbonate) that are retained on the coating surface, thereby preventing gas accumulation and internal pressurization while maintaining the sealed battery structure

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The harmful gases (oxygen and carbon dioxide) that accumulate in the sealed battery cell are converted into beneficial stable compounds through chemical reaction with the binary metal oxide coating. The oxygen is converted to barium peroxide and the carbon dioxide is converted to barium carbonate and magnesium carbonate, transforming the harmful pressurization effect into a stable, retained solid state that maintains battery performance

Inventive Principle:

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

2Ease of manufacture

If gases are allowed to accumulate during initial charging and operational cycles, then the battery formation process occurs naturally, but internal pressurization increases cell resistance and causes lithium plating

Engineering Contradiction:

Improvebattery formation processVSAvoidcell resistance and lithium plating prevention

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The binary metal oxide-based coating is applied to the interior surfaces of the battery cell before sealing and formation. This preliminary action ensures that when gases are generated during the natural formation process and initial charging cycles, they are immediately converted into stable compounds by the pre-present coating, preventing internal pressurization, reduced cell resistance, and lithium plating from the outset

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The binary metal oxide coating serves as an intermediary that facilitates the conversion of formation gases into stable compounds. During the natural battery formation process, the coating chemically interacts with the generated oxygen and carbon dioxide, transforming them into retained solid compounds, thereby allowing the formation process to proceed while preventing harmful pressurization and performance degradation

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Mitigates gas formation during initial cell formation and actively manages gas accumulation, enhancing battery performance and longevity by maintaining internal environment stability.

Implementation Method 1

a barium oxide-based coating... configured to convert oxygen and carbon dioxide gas into barium peroxide and carbonate

Methodology Applied

Scientific EffectChemical reaction: Chemical Bonding

Implementation Method 2

retain the barium peroxide and carbonate

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Data Source

PatentUS20250323334A1Lithium-ion battery gas getters

Publication Date: 2025.10.16 FORD GLOBAL TECH LLC

AI summary

This disclosure relates to systems and methods for gas mitigation. In one aspect of the disclosure, a battery is presented. The battery has a de-gassed lithium-manganese rich battery cell and a lithium-based anode packaged with a lithium-manganese-rich cathode, saturated in an electrolyte. A barium oxide-based coating is in the de-gassed lithium-manganese rich battery cell, and configured to convert oxygen and carbon dioxide into barium peroxide and carbonate and retain the barium peroxide and carbonate.