Battery Electrolyte Additives for Stable Li Reversibility at High Voltage

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Solution Overview

Problem

Conventional lithium-ion batteries face limitations such as inferior ionic conductivity, manufacturing complexity, high costs, and performance issues due to safety mechanisms that increase weight and lead to capacity loss and failure over time, necessitating improved electrolyte compositions for enhanced Li reversibility and high-voltage operation.

Innovation Solution

Incorporation of quaternary ammonium fluoride-containing compounds, particularly tetrabutylammonium tetrafluoroborate (TBATFB), as functional additives in electrolyte compositions to form a stable passivating film, suppressing dendrite growth and enhancing interfacial stability, thereby optimizing Li reversibility and ion transport properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional lithium-ion batteries use safety mechanisms to restrict voltage and internal pressures, then safety is improved, but weight increases and performance is limited

Engineering Contradiction:

ImprovesafetyVSAvoidweight

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The patent changes the chemical parameters of the electrolyte by introducing quaternary ammonium fluoride-containing compounds with specific molecular structures and fluorine content. This modifies the electrolyte's properties to achieve both safety and high voltage compatibility without adding mechanical safety components that would increase weight

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The electrolyte composition uses a composite system combining quaternary ammonium fluoride-containing compounds with conventional electrolyte components. This composite approach creates synergistic effects that provide inherent safety through chemical stability while maintaining low weight compared to mechanical safety systems

Inventive Principle:

Principle #40Composite materials

2Reliability

If quaternary ammonium compounds are used as functional additives in electrolyte solutions, then Li reversibility and interfacial stability are improved, but ionic conductivity decreases and manufacturing complexity increases

Engineering Contradiction:

Improveinterfacial stabilityVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The quaternary ammonium fluoride-containing compound serves multiple functions simultaneously: it forms protective interfacial films, enhances Li reversibility, provides voltage stability, and maintains ionic conductivity. This multi-functionality reduces the need for multiple separate additives, simplifying the overall electrolyte formulation and manufacturing process

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent optimizes the concentration and molecular structure parameters of the quaternary ammonium fluoride-containing compound to achieve the desired balance between interfacial stability and ionic conductivity. By carefully controlling these parameters, the electrolyte maintains high performance without requiring complex manufacturing procedures

Inventive Principle:

Principle #35Parameter changes

3Reliability

If electrolyte compositions are designed to enhance Li reversibility and enable high-voltage operation, then battery performance is improved, but cost increases

Engineering Contradiction:

Improvecycle lifeVSAvoidcost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent modifies the electrolyte composition by incorporating quaternary ammonium fluoride-containing compounds at optimized concentrations and selecting specific molecular structures. This parameter optimization achieves high cycle life and voltage stability while controlling material costs through efficient use of additives rather than expensive bulk materials

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The electrolyte uses small amounts of quaternary ammonium fluoride-containing compounds that provide long-lasting protective effects. These inexpensive additive compounds create durable interfacial films that extend battery life, offering a cost-effective solution compared to expensive high-performance materials

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 electrolyte compositions achieve high reversibility and cycle stability, enabling compatibility with 4-V class cathodes, while offering economic advantages and improved anodic and cathodic interfacial stability, with a columbic efficiency of greater than 95% over 200 cycles and specific capacity of greater than 100 mAh/g.

Implementation Method 1

form a stable passivating film

Methodology Applied

Scientific EffectPassivation:

Implementation Method 2

suppressing dendrite growth

Methodology Applied

Scientific EffectDendrite suppression:

Implementation Method 3

ion transport properties

Methodology Applied

Scientific EffectIon transport: Ion Exchange

Implementation Method 4

regulating Li flux

Methodology Applied

Scientific EffectLithium flux regulation:

Implementation Method 5

the tetrafluoroborate anion fluorinates the anode

Methodology Applied

Scientific EffectFluorination:

Data Source

PatentUS20260051540A1Electrolyte compositions including quaternary ammonium compounds for secondary batteries

Publication Date: 2026.02.19 GEORGIA TECH RES CORP

AI summary

Disclosed is an electrolyte composition, a secondary battery comprising the electrolyte composition, and a method of preparing a secondary battery. The electrolyte composition includes an electrolyte compound, a quaternary ammonium fluoride-containing compound, and a solvent.