Non-Aqueous Electrolyte Composition for Low-Gas High-Power Batteries

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Solution Overview

Problem

Nonaqueous electrolytic solution batteries face issues with increased internal pressure due to gas generation from electrolyte decomposition, leading to malfunction of the current cut-off valve during continuous charging, and reduced discharge power capacity due to narrowed gaps between electrodes.

Innovation Solution

Incorporating a compound with a specific terminal alkyne skeleton and a specific anion in a nonaqueous electrolytic solution at a specific mass ratio to suppress gas generation and improve interface resistance, thereby enhancing the battery's discharge power capacity and preventing current cut-off valve malfunction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If the capacity of the battery is increased by packing more electrode active material and reducing voids, then the capacity is improved, but the internal pressure significantly increases when gas is generated from electrolyte decomposition

Engineering Contradiction:

Improvebattery capacityVSAvoidinternal pressure

Core Design Contradiction:

Quantity of substanceVSStress or pressure

Solution Approach 1:

A compound with a specific terminal alkyne skeleton is introduced as an intermediary substance in the electrolyte. This compound mediates between the electrodes and the electrolyte, forming a protective interface layer that suppresses electrolyte decomposition and gas generation, thereby allowing high capacity without excessive pressure increase

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention changes the chemical composition parameters of the electrolyte by incorporating a specific terminal alkyne compound at optimized concentrations (0.01-5% by mass). This parameter change modifies the electrolyte's decomposition characteristics, reducing gas generation while maintaining high battery capacity

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the battery is kept in a continuous charging state to compensate for self-discharge, then the battery maintains readiness, but gas generation increases due to high electrode active material activity and heat generation

Engineering Contradiction:

Improvebattery readinessVSAvoidgas generation

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The terminal alkyne compound is preliminarily introduced into the electrolyte to prevent the harmful effects of continuous charging. It proactively suppresses electrolyte decomposition and gas generation before they occur, allowing the battery to remain in a continuous charging state without excessive gas accumulation

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The invention converts the high electrode activity that causes harm (gas generation during continuous charging) into a benefit. The terminal alkyne compound enables the high activity state to be maintained while suppressing unwanted side reactions, turning the continuously charged state from a problematic condition into an acceptable operational mode

Inventive Principle:

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

3Quantity of substance

If the capacity is increased by reducing the gap between electrodes, then the capacity is improved, but the resistance increases and discharge power capacity decreases

Engineering Contradiction:

Improvebattery capacityVSAvoiddischarge power capacity

Core Design Contradiction:

Quantity of substanceVSPower

Solution Approach 1:

The terminal alkyne compound acts as an intermediary that improves the electrode-electrolyte interface properties. This mediator reduces interfacial resistance, allowing narrow electrode gaps to maintain low resistance despite the reduced distance, thereby preserving discharge power capacity while achieving high capacity

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

The proposed solution effectively suppresses gas generation during normal use, ensuring proper operation of the current cut-off valve and improving discharge power capacity by optimizing the electrolyte composition.

Implementation Method 1

the electrolytic solution is easily decomposed to generate a gas

Methodology Applied

Scientific EffectElectrolyte decomposition: Electrolysis

Implementation Method 2

the activity of the electrode active material is always high, and a decrease in the capacity of the battery is accelerated due to heat generation of the device, and the electrolytic solution is easily decomposed

Methodology Applied

Scientific EffectElectrochemical reaction: Redox Reactions

Implementation Method 3

the gap between the positive electrode and the negative electrode through which lithium ions flow is narrowed

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS20240006668A1Non-Aqueous Electrolyte and Non-Aqueous Electrolyte Battery Using Same

Publication Date: 2024.01.04 MU IONIC SOLUTIONS CORP

AI summary

The present disclosure relates to: a nonaqueous electrolytic solution containing a compound (A) represented by general formula (1) and an anion (B) represented by general formula (2), and having amass ratio [(A)/(B)] of 0.01 or more and 1.2 or less; and a nonaqueous electrolytic solution battery including a positive electrode having a positive electrode active material capable of absorbing and releasing lithium ions, a negative electrode, and the nonaqueous electrolytic solution.