Cyclic Ether Binder for High-Temperature Battery Stability

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Solution Overview

Problem

Existing non-aqueous batteries, such as lithium secondary batteries, face challenges in maintaining high discharge capacity and stable charge-discharge cycles, especially at high temperatures, with previous technologies failing to adequately address these issues.

Innovation Solution

Incorporating a binder composition for non-aqueous battery electrodes that includes a cyclic ether compound with specific substituents, which enhances the initial discharge capacity and stability of charge-discharge cycles at high temperatures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional electrolyte compositions are used to improve charge-discharge cycle stability, then cycle stability is improved, but discharge capacity decreases

Engineering Contradiction:

Improvecharge-discharge cycle stabilityVSAvoiddischarge capacity

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The invention changes the chemical composition parameters of the electrolyte by introducing a specific cyclic ether compound with a divalent linear hydrocarbon group (Formula 1) and adjusting its concentration range (0.1-10% by weight), thereby achieving both high discharge capacity and stable charge-discharge cycles at high temperatures

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite electrolyte system by combining the cyclic ether compound (Formula 1) with conventional electrolyte components (cyclic carbonate, chain carbonate, lithium salt), where the cyclic ether compound acts as a functional additive that enhances both capacity and stability without compromising the base electrolyte's properties

Inventive Principle:

Principle #40Composite materials

2Reliability

If simple cyclic ether compounds are added to improve battery performance, then some performance aspects are improved, but continuous charge property and high-temperature storage property remain unsolved

Engineering Contradiction:

Improvebattery performanceVSAvoidcontinuous charge property and high-temperature storage property

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention introduces a specific structural feature (divalent linear hydrocarbon group R1 in Formula 1) into the cyclic ether compound to create local chemical properties that specifically address high-temperature stability and continuous charge performance, rather than using generic cyclic ether compounds

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention optimizes the concentration parameter of the cyclic ether compound (0.1-10% by weight) to achieve the right balance between improving discharge capacity and maintaining continuous charge property and high-temperature storage stability

Inventive Principle:

Principle #35Parameter changes

3Quantity of substance

If electrode composition is optimized for high discharge capacity, then initial discharge capacity is improved, but stability at high temperatures deteriorates

Engineering Contradiction:

Improveinitial discharge capacityVSAvoidstability at high temperatures

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The cyclic ether compound (Formula 1) acts as an intermediary substance in the electrolyte that mediates between the electrode and the bulk electrolyte, forming a stable interface layer that enables high discharge capacity while maintaining thermal stability through its specific molecular structure

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS9153820B2Binder composition for non-aqueous battery electrode, electrolyte solution composition for non-aqueous battery, and use thereof

Publication Date: 2015.10.06 ZEON CORP

AI summary

A binder composition for a non-aqueous battery electrode containing a binder and an ether compound represented by the formula (1), and an electrolyte solution composition for a non-aqueous battery containing an ether compound represented by the formula (1), wherein m and n each independently represent 0 or 1, and R1 represents a divalent linear hydrocarbon group which may have in the bond thereof one or more intervening groups selected from the group consisting of an oxygen atom, a sulfur atom, and a carbonyl group.