Battery Electrolyte Additive for High-Temperature Capacity Retention

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Solution Overview

Problem

Existing lithium secondary batteries face challenges with decreased output and increased resistance at high and low temperatures, necessitating improved charge resistance, long-term storage capabilities, and enhanced capacity retention, especially for automotive applications.

Innovation Solution

Incorporation of a specific electrolyte additive with a substituent represented by Chemical Formula 1, which forms a stable film on the electrode, reducing charge resistance and preventing decomposition at high temperatures, thereby improving charging efficiency and lifespan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional electrolytes are used in lithium secondary batteries, then the batteries can operate with basic lithium ion movement, but the output and capacity retention rate decrease at high temperatures

Engineering Contradiction:

Improvecapacity retention rateVSAvoidhigh temperature performance

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent introduces a novel electrolyte additive with a specific molecular structure containing phosphorus, oxygen, and fluorine atoms in a cyclic configuration. This chemical parameter change modifies the electrolyte's interaction with electrode surfaces, forming stable protective films that prevent degradation at high temperatures, thereby maintaining capacity retention rate while operating in elevated temperature environments.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite electrolyte system by combining the newly developed additive compound with conventional electrolyte components. This composite approach allows the additive to work synergistically with existing electrolyte materials, providing enhanced high-temperature stability and capacity retention without compromising the fundamental lithium ion conduction function of the base electrolyte.

Inventive Principle:

Principle #40Composite materials

2Power

If battery capacity is increased for automobile use, then the output improves, but resistance increases at high and low temperatures

Engineering Contradiction:

Improvebattery outputVSAvoidtemperature-dependent resistance

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The patent employs the electrolyte additive as an intermediary substance that mediates between the electrodes and the bulk electrolyte. This additive adsorbs onto electrode surfaces to form stable interfacial layers that reduce charge transfer resistance, enabling high power output while maintaining low resistance even at extreme temperatures. The additive acts as a protective intermediary that prevents direct harmful interactions between conventional electrolyte components and electrode materials at elevated temperatures.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Duration of action of stationary object

If batteries are designed for long-term storage, then storage duration improves, but recovery capacity decreases at high temperatures

Engineering Contradiction:

Improvestorage durationVSAvoidrecovery capacity

Core Design Contradiction:

Duration of action of stationary objectVSReliability

Solution Approach 1:

The patent implements preliminary action by having the electrolyte additive proactively form stable protective films on electrode surfaces during initial battery cycles and storage periods. These pre-formed films prevent degradation reactions and structural collapse that would otherwise occur at high temperatures during long-term storage. By performing this protective action in advance, the battery maintains its recovery capacity even after extended storage at elevated temperatures.

Inventive Principle:

Principle #10Preliminary action

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 additive enhances charging efficiency, reduces charge resistance, and maintains capacity retention at high temperatures, ensuring long-term storage and improved output, making it suitable for automotive batteries.

Implementation Method 1

forms a stable film on electrodes, preventing decomposition and structural collapse

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 2

an electrolyte between a positive electrode and a negative electrode enables smooth movement of lithium ions

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Implementation Method 3

electricity is generated or consumed by oxidation-reduction reaction according to intercalation and desorption at the positive and negative electrodes

Methodology Applied

Scientific EffectOxidation-reduction reaction: Redox Reactions

Data Source

PatentUS12620623B2Electrolyte additive, electrolyte for batteries including electrolyte additive, and secondary battery including electrolyte

Publication Date: 2026.05.05 SOULBRAIN CO LTD

AI summary

The present invention relates to an electrolyte additive including a compound containing a substituent represented by Chemical Formula 1, an electrolyte including the electrolyte additive, and a secondary battery including the electrolyte.In Chemical Formula 1, P and O are phosphorus and oxygen, respectively; A is a bond or oxygen; Q is oxygen or an unshared electron pair; R1, R2, R3, and R4 are each independently hydrogen, a linear or branched alkyl group having 1 to 10 carbon atoms, an alkenyl group, an alkynyl group, an alkoxy group, an alkoxycarbonyl group, an alkoxyalkyl group, a fluoroalkyl, or a cyclic sulfate; optionally, R1 or R2 is connected to R3 or R4 to form a double bond or a ring; n is an integer from 0 to 3; and * is a binding position.