Fluorinated Ether Electrolyte for High Voltage Lithium Batteries

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Solution Overview

Problem

Conventional organic fluorinated ether compounds used in lithium secondary batteries have limitations in performance, particularly in terms of high voltage stability and low-temperature resistance, necessitating a novel compound with improved characteristics.

Innovation Solution

An electrolyte comprising an organic fluorinated ether compound with a specific structure, represented by Formula 1 (CF3—R1—O—CF2—CHF—(CH2)n—CF3), where R1 is a C1-C10 alkylene or fluorinated alkylene group and n is an integer of 0 to 10, combined with a lithium salt and organic solvent, enhancing the battery's stability and capacity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic fluorinated ether compounds are used in lithium secondary batteries, then the battery can operate with basic electrolyte functionality, but the battery exhibits insufficient high voltage stability and poor low-temperature resistance

Engineering Contradiction:

Improvehigh voltage stabilityVSAvoidlow-temperature resistance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent modifies the molecular structure of organic fluorinated ether compounds by changing parameters such as the fluorine substitution pattern (Formula 1: CF3—R1—O—CF2—CHF—(CH2)n—CF3), the type of alkylene group (R1), and the integer value of n (0-10). These parameter changes in the electrolyte compound structure improve both high voltage stability and low-temperature resistance simultaneously, resolving the technical contradiction between these two performance aspects.

Inventive Principle:

Principle #35Parameter changes

2Duration of action of moving object

If conventional organic fluorinated ether compounds are used, then the electrolyte can provide basic ionic conductivity, but the battery lifetime and capacity are limited

Engineering Contradiction:

Improvebattery lifetimeVSAvoidbattery capacity

Core Design Contradiction:

Duration of action of moving objectVSQuantity of substance

Solution Approach 1:

The patent employs composite electrolyte formulations combining conventional organic fluorinated ether compounds with novel compounds following Formula 1, along with lithium salts and other organic solvents. This composite approach creates synergistic effects that extend battery lifetime while maintaining or enhancing capacity, resolving the contradiction between duration of action and quantity of substance.

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 proposed electrolyte composition improves the lithium secondary battery's lifetime, capacity, and reduces low-temperature resistance, preventing decomposition and forming a stable solid electrolyte interface, thereby enhancing overall battery performance.

Implementation Method 1

forming a stable solid electrolyte interface, thereby enhancing overall battery performance

Methodology Applied

Scientific EffectSolid electrolyte interface formation:

Implementation Method 2

preventing decomposition and forming a stable solid electrolyte interface

Methodology Applied

Scientific EffectDecomposition prevention:

Data Source

PatentUS10211482B2Electrolyte for lithium secondary battery and lithium secondary battery employing the same

Publication Date: 2019.02.19 SAMSUNG ELECTRONICS CO LTD

AI summary

An electrolyte for a lithium secondary battery, the electrolyte including: a lithium salt, an organic solvent, and an organic fluorinated ether compound represented by Formula 1:CF3—R1—O—CF2—CHF—(CH2)n—CF3 Formula 1wherein, in Formula 1, R1 is a C1-C10 alkylene group, a C3-C10 cycloalkylene group, a C1-C10 fluorinated alkylene group, or a C3-C10 fluorinated cycloalkylene group; and n is an integer of 0 to 10.