Aromatic Carboxylate Ester Electrolyte for Battery Side Reaction Control

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Solution Overview

Problem

Nonaqueous electrolyte secondary batteries face challenges in enhancing initial battery characteristics and durability testing, such as capacity, efficiency, rate characteristics, and overcharge safety due to the high reactivity of aromatic ester compounds used in existing electrolytic solutions.

Innovation Solution

Incorporating a specific aromatic carboxylate ester and additional compounds like fluorine-containing cyclic carbonates, sulfur-containing organic compounds, or phosphonate esters into the electrolytic solution to form stable film structures on electrodes, reducing side reactions and enhancing battery performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If aromatic ester compounds are added to electrolytic solutions to enhance energy density and long-term durability, then battery capacity and durability are improved, but reductive and oxidative side reactions increase, deteriorating initial battery characteristics and overcharge safety

Engineering Contradiction:

Improvelong-term durabilityVSAvoidreductive and oxidative side reactions

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent introduces specific structural parameters for the aromatic ester compound (Formula 1) including the aromatic group A1, substituent groups R2 and R3, and the integer parameters a1 and n1. By controlling these structural parameters and the concentration range (0.01-5 mass%), the patent achieves improved long-term durability while suppressing harmful side reactions that occurred with conventional aromatic esters

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite electrolytic solution system by combining the specific aromatic ester compound (Formula 1) with conventional electrolyte components (cyclic carbonates, chain carbonates, lithium salts). This composite approach allows the aromatic ester to provide durability enhancement while the other components maintain stable initial characteristics and suppress side reactions

Inventive Principle:

Principle #40Composite materials

2Productivity

If aromatic ester compounds are added to electrolytic solutions to improve capacity and efficiency, then battery performance is enhanced, but overcharge safety deteriorates due to high reactivity

Engineering Contradiction:

Improvebattery capacityVSAvoidovercharge safety

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent modifies the molecular structure parameters of the aromatic ester (Formula 1) including the aromatic group type (A1), substituent nature (R2, R3), and structural integers (a1, n1) to reduce reactivity while maintaining capacity enhancement. The controlled concentration range (0.01-5 mass%) further optimizes the balance between productivity and safety

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The specific aromatic ester compound acts as an intermediary that forms protective films on electrode surfaces, mediating between the electrolyte and electrodes to enable high capacity while preventing direct harmful reactions that would compromise overcharge safety

Inventive Principle:

Principle #24Intermediary (Mediator)

3Quantity of substance

If conventional aromatic esters are used in electrolytic solutions to enhance energy density, then battery capacity increases, but initial gas production increases, deteriorating initial battery characteristics

Engineering Contradiction:

Improveenergy densityVSAvoidinitial gas production

Core Design Contradiction:

Quantity of substanceVSObject-generated harmful factors

Solution Approach 1:

The patent changes the structural parameters of the aromatic ester (Formula 1) including the aromatic group (A1), substituent groups (R2, R3), and structural integers (a1, n1) to reduce gas-generating side reactions. The optimized concentration range (0.01-5 mass%) further suppresses initial gas production while maintaining high energy density

Inventive Principle:

Principle #35Parameter changes

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 allows for simultaneous improvement in initial battery characteristics and durability, reducing reductive and oxidative side reactions, thereby enhancing the performance and safety of nonaqueous electrolyte secondary batteries.

Implementation Method 1

Methodology Applied

Scientific EffectElectrochemical reaction:

Data Source

PatentUS10777850B2Nonaqueous electrolytic solution and nonaqueous electrolyte secondary battery using the same

Publication Date: 2020.09.15 MITSUBISHI CHEM CORP

AI summary

A nonaqueous electrolytic solution, containing an electrolyte, a nonaqueous solvent and an aromatic carboxylate ester of formula (1):wherein A1 is an optionally substituted aryl group, n1 is an integer of 1 or greater, R2 and R3 are a hydrogen atom, a halogen atom or an optionally substituted hydrocarbon group having 1 to 12 carbon atoms, a1 is an integer of 1 or 2, and when a1 is 1, R1 is an optionally substituted hydrocarbon group having 1 to 12 carbon atoms, a1 is 2, R1 is an optionally substituted hydrocarbon group having 1 to 12 carbon atoms, n1 is 1, at least one of R2 and R3 is an optionally substituted hydrocarbon group having 1 to 12 carbon atoms, and n1 is 2 and R2s and R3s are all hydrogen atoms, R1 is an optionally substituted aliphatic hydrocarbon group having 1 to 12 carbon atoms.