Non-Aqueous Battery Electrolyte for Stable High-Voltage Electrode Films

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Solution Overview

Problem

Lithium secondary batteries face issues with decomposition of the electrolyte solution due to metal ion leaching from the positive electrode, leading to electrode deterioration and reduced performance, especially under high voltage and temperature conditions, and are prone to voltage drops from foreign substances and short circuits.

Innovation Solution

Incorporating a lithium salt with an anion having a sulfone imide group and a propane sultone or ethylene sulfate group as an additive in the non-aqueous electrolyte solution to form a stable film on the electrode surface, fixing anions and improving lithium ion transport.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the potential of the positive electrode is increased to improve energy density, then the energy storage capacity is improved, but metal ion leaching from the positive electrode surface is accelerated, leading to negative electrode deterioration

Engineering Contradiction:

Improveenergy storage capacityVSAvoidelectrode stability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent applies preliminary action by pre-forming a protective film on the positive electrode surface using a sultone compound additive before metal ion leaching can occur. This protective layer is created during initial battery cycles, preventing subsequent metal ion dissolution even when the positive electrode operates at high potentials for improved energy density.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The sultone compound acts as an intermediary substance between the positive electrode and the electrolyte solution. It forms a protective interface layer that mediates the interaction, preventing direct contact between the electrolyte and the positive electrode surface, thereby blocking metal ion leaching while allowing lithium ion transport.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If compounds capable of forming a protective SEI film are added to the electrolyte solution to protect the negative electrode, then electrode stability is improved, but other side effects occur that reduce overall battery performance

Engineering Contradiction:

Improveelectrode stabilityVSAvoidbattery performance

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies local quality by using a sultone compound that selectively forms a protective film only on the positive electrode surface where metal ion leaching occurs. This localized protection approach avoids the side effects associated with general SEI film formers that affect the entire battery system, thereby maintaining high battery performance while protecting against electrode deterioration.

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If foreign substances are present in raw materials or mixed in the manufacturing process, then voltage drop occurs due to minute short circuits, but the loss in the final manufacturing stage is large

Engineering Contradiction:

Improvemanufacturing processVSAvoidvoltage stability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent converts the harmful effect of foreign substances by using a sultone compound additive that proactively forms a protective film on the positive electrode. This film prevents metal ion leaching that could cause short circuits and voltage drops, thereby converting the potential harm of impurities into a benefit by creating a robust protective barrier that ensures voltage stability even in the presence of manufacturing variations.

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 solution enhances the battery's lifetime and high-rate charging/discharging capabilities by suppressing electrolyte decomposition and reducing resistance, even under high voltage conditions.

Implementation Method 1

forming a protective film, that is, the SEI film on the surface of the negative electrode

Methodology Applied

Scientific EffectSEI film formation:

Implementation Method 2

capable of forming a stable film on the surface of an electrode, by incorporating a lithium salt containing an anion having a sulfone imide group and a propane sultone group or an ethylene sulfate group

Methodology Applied

Scientific EffectElectrochemical reaction:

Implementation Method 3

fixing anions that hinder the transport of lithium to the film of the electrode to reduce the resistance of the film, and improving the transport rate of lithium ions

Methodology Applied

Scientific EffectIon transport:

Data Source

PatentUS12531272B2Non-aqueous electrolyte for lithium secondary battery, and lithium secondary battery comprising same

Publication Date: 2026.01.20 LG ENERGY SOLUTION LTD

AI summary

The present invention provides a non-aqueous electrolyte solution for a lithium secondary battery comprising a lithium salt, an organic solvent and an additive, wherein the additive includes an anion having a sulfone imide group and a propane sultone group or an ethylene sulfate group.