Non-Aqueous Battery Electrolyte Additives for Fast Charging Retention

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Solution Overview

Problem

Lithium secondary batteries lack sufficient quick charging performance and experience rapid performance decline with repeated quick charging, failing to meet the increasing demands for high energy density, durability, and quick charging capabilities, especially in harsh conditions.

Innovation Solution

A non-aqueous electrolyte solution for lithium secondary batteries is developed, comprising a lithium salt, organic solvent, and a specific compound represented by Formula 1 as a first additive, along with optional second additives like vinyl ethylene carbonate and fluoroethylene carbonate, optimized in concentration to enhance quick charging and output properties while reducing gas production.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If conventional electrolyte solutions are used, then basic battery function is maintained, but quick charging performance is insufficient

Engineering Contradiction:

Improvequick charging performanceVSAvoidbattery performance retention

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent modifies the chemical composition parameters of the electrolyte by introducing a specific cyclic carbonate compound with fluorinated alkyl groups (Formula 1) at controlled concentrations (0.01-10 wt%). This compositional parameter change enables faster lithium ion transport kinetics while maintaining electrode interface stability, achieving both quick charging performance and battery durability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite electrolyte system by combining the novel cyclic carbonate compound (Formula 1) with conventional linear carbonates (DMC, DEC) and cyclic carbonates (EC, PC). This composite approach integrates the high conductivity and fast charging benefits of the new compound with the proven stability of traditional electrolyte components, resolving the contradiction between speed and reliability

Inventive Principle:

Principle #40Composite materials

2Loss of time

If quick charging is implemented, then charging time is reduced, but battery performance declines rapidly with repeated charging

Engineering Contradiction:

Improvecharging timeVSAvoidbattery lifespan

Core Design Contradiction:

Loss of timeVSDuration of action of stationary object

Solution Approach 1:

The cyclic carbonate compound in the electrolyte proactively forms stable protective films on electrode surfaces during initial cycles. This preliminary action creates a stable solid electrolyte interface (SEI) layer that prevents subsequent degradation reactions, enabling repeated quick charging cycles without performance decline

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The electrolyte composition with Formula 1 compound provides beforehand cushioning by forming a protective barrier layer on electrodes before degradation can occur. This cushioning effect absorbs the stress of rapid charging and discharging cycles, preventing cumulative damage that would otherwise lead to rapid performance decline

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Productivity

If electrolyte composition is optimized for quick charging, then charging speed improves, but gas production increases

Engineering Contradiction:

Improvecharging rateVSAvoidgas production

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent applies local quality by concentrating the novel cyclic carbonate compound (Formula 1) at specific optimal concentrations (0.01-10 wt%) within the electrolyte mixture. This localized optimization at the molecular level enables fast charging performance while the controlled concentration prevents excessive gas-generating side reactions, balancing productivity and harmful factor reduction

Inventive Principle:

Principle #3Local quality

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 quick charging performance and retention, maintaining battery health even with repeated quick charging, and enhances low-temperature discharge output, offering superior energy density and durability.

Implementation Method 1

injecting a non-aqueous electrolyte solution that is a medium transferring lithium ions thereto

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Implementation Method 2

including a compound represented by the following Formula 1 as a first additive... capable of enhancing quick charging performance and resistance properties

Methodology Applied

Scientific EffectFilm formation: Deposition (physical)

Data Source

PatentUS11888117B2Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery comprising same

Publication Date: 2024.01.30 LG ENERGY SOLUTION LTD

AI summary

One embodiment of the present invention provides a non-aqueous electrolyte solution for a lithium secondary battery, including a lithium salt, an organic solvent and a compound represented by Formula 1 as a first additive,wherein, R1 and R2 are described herein.