Electrolyte Composition for High-Temperature Li-Ion Cycle Stability

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Solution Overview

Problem

Current lithium-ion secondary batteries face challenges in maintaining high-temperature cycle characteristics, such as impedance and capacity retention, which are crucial for their application in various fields, including automobiles.

Innovation Solution

An electrolyte solution containing a specific compound represented by formula (1) and at least one compound selected from formulas (11-1) to (11-5), which improves the high-temperature cycle characteristics of electrochemical devices by enhancing impedance and capacity retention.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional electrolyte solutions are used, then basic battery function is maintained, but high-temperature cycle characteristics (impedance and capacity retention) deteriorate

Engineering Contradiction:

Improvehigh-temperature cycle characteristicsVSAvoidimpedance increase and capacity loss at high temperature

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent modifies the chemical structure of electrolyte additives by introducing specific substituent groups (R101 and R102) with defined chemical properties (fluorine atoms, siloxane groups, sulfone groups) to change the electrochemical behavior and thermal stability parameters of the electrolyte solution, thereby improving high-temperature cycle characteristics

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent combines compound (1) with specific compounds from formulas (11-1) to (11-5) to create a composite electrolyte system where the synergistic interaction between different chemical components enhances both impedance stability and capacity retention at elevated temperatures

Inventive Principle:

Principle #40Composite materials

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 solution significantly improves the high-temperature cycle characteristics of electrochemical devices, leading to better performance and reliability in lithium-ion secondary batteries.

Implementation Method 1

electrolyte solution containing a compound (1) represented by the following formula (1) and at least one compound (11) selected from the group consisting of compounds represented by the following formulas (11-1) to (11-5)

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS11916195B2Electrolyte solution, electrochemical device, lithium ion secondary battery, and module

Publication Date: 2024.02.27 DAIKIN INDUSTRIES LTD

AI summary

An electrolyte solution containing a compound (1) represented by the formula (1), (wherein R101 and R102 are each individually a substituent such as a C1-C7 alkyl group, and the substituent optionally contains at least one divalent to hexavalent hetero atom in a structure or optionally has a structure obtained by replacing at least one hydrogen atom by a fluorine atom or a C0-C7 functional group) and at least one compound (11) selected from compounds such as a compound represented by formula (11-1) (wherein R111 and R112 are the same as or different from each other and are each a hydrogen atom or the like, and R113 is an alkyl group free from a fluorine atom or the like):