Dual-Additive Li-Ion Electrolyte for Low-Impedance Temperature Stability

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Solution Overview

Problem

Lithium-ion batteries face challenges in maintaining optimal performance across a broad temperature range, particularly in reducing impedance, improving low-temperature cycling performance, and enhancing high-temperature storage performance.

Innovation Solution

An electrolyte solution comprising additives A and B, where additive A includes specific compounds and additive B includes lithium salts, forms stable cathode and anode interface films, promoting lithium ion migration and reducing impedance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional electrolyte solutions are used, then the lithium-ion battery can operate at normal temperature, but the impedance increases and performance deteriorates at high or low temperatures

Engineering Contradiction:

Improveoperating temperature rangeVSAvoidelectrochemical performance at extreme temperatures

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent modifies the chemical composition parameters of the electrolyte by introducing specific additives (compounds with fluorinated alkyl chains and cyclic carbonate structures) to change the physical and chemical properties of the electrolyte solution, enabling it to maintain stable performance across a broader temperature range from -40°C to 60°C

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite electrolyte system by combining multiple components: base electrolyte (cyclic and chain carbonates), lithium salts (LiPF6, LiBF4), and specialized additives (fluorinated cyclic carbonates and chain carbonates with specific molecular structures), where each component contributes unique properties that collectively improve temperature adaptability

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 effectively reduces the impedance of lithium-ion batteries, enhances low-temperature cycling performance, and improves high-temperature storage performance, allowing the batteries to function efficiently across a broader temperature range.

Implementation Method 1

the additive A and the additive B can jointly promote the migration of lithium ions, thereby reducing the impedance of the lithium-ion battery

Methodology Applied

Scientific EffectIon migration: Electrolysis

Data Source

PatentUS20250140922A1Electrolyte solution, lithium-ion battery, and electronic device

Publication Date: 2025.05.01 NINGDE AMPEREX TECHNOLOGY LTD

AI summary

An electrolyte solution includes an additive A and an additive B. The additive A includes at least one selected from a group consisting of a compound of Formula (I-1), a compound of Formula (I-2), or a compound of Formula (1-3). The additive B includes at least one of lithium bis(trifluoromethanesulfonyl)imide, Lithium difluoro (bisoxalato)phosphate, or lithium bis(oxalato) borate. Applying the electrolyte solution containing the additive A and the additive B to a lithium-ion battery can reduce the impedance of the lithium-ion battery and improve the low-temperature cycling performance and high-temperature storage performance of the lithium-ion battery.