Disultone-Based Electrolyte for Lithium Battery Stability

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Solution Overview

Problem

Lithium batteries using organic electrolyte solutions face challenges with lifespan characteristics and high-temperature stability due to side reactions between the anode/cathode and electrolyte, leading to reduced performance and durability.

Innovation Solution

Incorporating a disultone-based compound and imide-based or phosphate-based lithium salts into the organic electrolyte solution, which forms stable solid electrolyte interface (SEI) and protection layers on the anode and cathode, enhancing ion tunneling and blocking direct contact between the organic solvent and electrodes, thereby improving reversibility and thermal stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If conventional organic electrolyte solution is used in lithium battery, then the battery can operate at high voltage, but lifespan characteristics and high-temperature stability deteriorate due to side reactions between electrodes and electrolyte

Engineering Contradiction:

Improvedriving voltageVSAvoidlifespan characteristics and high-temperature stability

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The patent introduces a disultone-based compound as an intermediary substance in the electrolyte solution. This compound mediates between the electrodes and the conventional electrolyte components, forming protective interface layers that prevent direct harmful interactions while allowing ionic conduction. The disultone-based compound acts as a buffer that reduces side reactions between the high-voltage electrodes and the electrolyte, thereby improving lifespan and thermal stability without sacrificing operating voltage.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite electrolyte system by combining conventional lithium salts (LiPF6, LiBF4) with disultone-based compounds in a multi-component formulation. This composite approach integrates the high ionic conductivity of traditional electrolytes with the protective interface-forming capabilities of the disultone-based compound, achieving both high voltage operation and improved reliability through synergistic effects of the combined materials.

Inventive Principle:

Principle #40Composite materials

2Reliability

If organic electrolyte solution is used to achieve high voltage operation, then ion conductivity can be maintained, but side reactions occur between anode/cathode and electrolyte leading to reduced durability

Engineering Contradiction:

Improveion conductivityVSAvoiddurability

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The disultone-based compound performs preliminary action by preferentially reacting with electrode surfaces during initial cycles to form stable protective layers (SEI on anode and protective film on cathode) before the conventional electrolyte components can undergo harmful side reactions. This preliminary interface formation prevents subsequent degradation reactions, thereby extending battery durability while maintaining ion conductivity through the engineered interface layers.

Inventive Principle:

Principle #10Preliminary action

3Ease of manufacture

If conventional electrolyte composition is used, then the battery can be manufactured with standard processes, but thermal stability and performance consistency across temperature ranges are insufficient

Engineering Contradiction:

Improvemanufacturing process compatibilityVSAvoidthermal stability and performance consistency

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The patent modifies the chemical composition parameters of the electrolyte by incorporating disultone-based compounds with specific molecular structures and functional groups. This parameter change in the electrolyte formulation enhances thermal stability and performance consistency across temperature ranges from -30°C to 85°C, while the modification can be integrated into existing manufacturing processes through simple mixing and formulation adjustments.

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 solution significantly improves the lithium battery's lifespan characteristics and high-temperature stability, maintaining performance across a wide temperature range from -30°C to 85°C with reduced internal resistance and increased capacity retention.

Implementation Method 1

forms stable solid electrolyte interface (SEI) and protection layers on the anode and cathode

Methodology Applied

Scientific EffectSolid electrolyte interface (SEI) formation:

Implementation Method 2

enhancing ion tunneling and blocking direct contact between the organic solvent and electrodes

Methodology Applied

Scientific EffectIon tunneling:

Data Source

PatentUS9847554B2Organic electrolytic solution and lithium battery comprising organic electrolyte solution

Publication Date: 2017.12.19 SAMSUNG SDI CO LTD

AI summary

Provided is an organic electrolyte solution including a disultone-based compound represented by Formula 1; a first lithium salt that is at least one selected from lithium bis(fluorosulfonyl) imide (Li(FSO2)2N) and lithium difluorophosphate (LiPO2F2); a second lithium salt; and an organic solvent:wherein, in Formula 1, A1, A2, A3, and A4 are each independently a C1 to C5 alkylene group unsubstituted or substituted with a substituent; a carbonyl group; or a sulfinyl group, n1 to n4 are each independently 1 to 3, and when the number of A1, A2, A3, and A4 are each independently two or greater, the plurality of A1, A2, A3, and A4 are identical to or different from each other.