Non-Aqueous Battery Electrolyte Additives for High-Temperature Durability

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Solution Overview

Problem

Lithium secondary batteries suffer from performance degradation due to gas generation and structural instability caused by electrolyte decomposition and transition metal elution at high temperatures, particularly in high-Ni-based positive electrodes, leading to reduced capacity and durability.

Innovation Solution

A non-aqueous electrolyte solution for lithium secondary batteries containing a compound with a propargyl group, phosphite group, and carbonate group as additives to form stable films on electrode surfaces, suppressing transition metal elution and reducing side reactions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If high-Ni-based positive electrode is used to increase energy density, then battery capacity is improved, but electrolyte decomposition and gas generation increase at high temperatures

Engineering Contradiction:

Improvebattery capacityVSAvoidgas generation from electrolyte decomposition

Core Design Contradiction:

Quantity of substanceVSObject-generated harmful factors

Solution Approach 1:

A compound containing propargyl group, phosphite group, and carbonate group is introduced as an intermediary substance that reacts preferentially to form protective films on the electrode surface. This intermediary compound acts as a mediator between the high-Ni positive electrode and the electrolyte, preventing direct harmful interactions while maintaining battery capacity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The additive compound performs preliminary protective action by forming stable passivation films on the electrode surface before electrolyte decomposition can occur. This preliminary film formation prevents subsequent gas generation and electrolyte decomposition, countering harmful effects before they manifest.

Inventive Principle:

Principle #9Preliminary anti-action

2Quantity of substance

If high-Ni-based positive electrode is used to increase energy density, then battery capacity is improved, but structural stability of positive electrode deteriorates due to transition metal elution

Engineering Contradiction:

Improvebattery capacityVSAvoidstructural stability of positive electrode

Core Design Contradiction:

Quantity of substanceVSStability of the object's composition

Solution Approach 1:

The compound with propargyl, phosphite, and carbonate groups serves as a protective intermediary layer between the high-Ni positive electrode and the electrolyte. This intermediary film prevents transition metal elution from the positive electrode, maintaining structural stability while preserving high capacity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention changes the chemical composition parameters of the electrolyte by introducing a compound with specific functional groups (propargyl, phosphite, carbonate). This parameter change in electrolyte composition leads to the formation of stable passivation films that prevent metal elution and maintain electrode structural stability.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If conventional electrolyte is used to maintain simplicity, then device complexity is low, but high-temperature durability deteriorates

Engineering Contradiction:

Improveelectrolyte composition complexityVSAvoidhigh-temperature durability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The invention modifies the electrolyte composition by incorporating a compound with specific functional groups (propargyl, phosphite, carbonate) in controlled amounts. This parameter change in composition enables the formation of protective films that significantly improve high-temperature durability while maintaining relatively simple overall electrolyte structure.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The electrolyte is formulated as a composite system combining conventional electrolyte components with the specialized compound containing multiple functional groups. This composite approach integrates the benefits of simple conventional electrolytes with the protective properties of the advanced additive, achieving high-temperature durability enhancement.

Inventive Principle:

Principle #40Composite materials

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 solution enhances high-temperature storage and cycle characteristics by forming robust solid electrolyte interphase (SEI) and positive electrode-electrolyte intermediate films, improving battery durability and capacity retention.

Implementation Method 1

a compound represented by Formula (1) as an additive... capable of forming a stable film on the surface of an electrode

Methodology Applied

Scientific EffectElectrochemical reduction: Reduction

Implementation Method 2

the oxidation and reduction decomposition of electrolytes occurs, causing gas generation inside the cell

Methodology Applied

Scientific EffectElectrochemical oxidation: Oxidation

Data Source

PatentEP4287338B1Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery including the same

Publication Date: 2026.03.25 LG ENERGY SOLUTION LTD

AI summary

The present invention aims to provide a non-aqueous electrolyte solution for a lithium secondary battery and a lithium secondary battery comprising same and thus having improved high-temperature durability. Specifically, the non-aqueous electrolyte solution for a lithium secondary battery may contain a lithium salt, a non-aqueous organic solvent, and a compound, represented by chemical formula 1, as an additive.