Negative Electrode Binder for Low-Temperature Fast Charging

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Solution Overview

Problem

Existing binders in electrochemical apparatuses have poor affinity with electrolytes, hindering lithium ion conduction and increasing interfacial impedance, which deteriorates fast charging and discharging performance, especially in low-temperature environments.

Innovation Solution

The use of a negative electrode binder with a specific structural formula (I) that provides numerous lithium ion exchange sites, enhancing ionic conductivity and improving fast charging and discharging performance in low-temperature conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing binder is used in the negative electrode, then the electrode plate structure is stabilized and electronic contact is enhanced, but the affinity with electrolyte is poor which hinders lithium ion conduction and increases interfacial impedance

Engineering Contradiction:

Improveelectrode plate structure stabilityVSAvoidlithium ion conduction efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The invention changes the chemical composition parameters of the binder by introducing specific functional groups (carboxyl, hydroxyl, or amine groups) into the polymer chain structure. This modifies the binder's properties to enhance both structural stability and lithium ion conduction capability, resolving the contradiction between structural reliability and ionic conductivity.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite binder structure by incorporating functional groups (carboxyl, hydroxyl, or amine groups) into the polymer matrix. This composite approach combines the structural stability of the base polymer with the ionic conductivity enhancement provided by the functional groups, achieving both requirements simultaneously.

Inventive Principle:

Principle #40Composite materials

2Stability of the object's composition

If existing binder is used in the negative electrode, then the electrode plate structure is stabilized, but the fast charging performance deteriorates due to poor electrolyte affinity and high interfacial impedance

Engineering Contradiction:

Improveelectrode plate structure stabilityVSAvoidfast charging performance

Core Design Contradiction:

Stability of the object's compositionVSSpeed

Solution Approach 1:

The invention modifies the binder's chemical parameters by introducing functional groups that enhance electrolyte interaction. This enables faster lithium ion transport kinetics while preserving the structural stability provided by the polymer matrix, thereby improving fast charging performance without compromising structural integrity.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The functional groups (carboxyl, hydroxyl, or amine groups) act as intermediaries between the binder and lithium ions. These groups facilitate faster ion exchange and transport while the polymer matrix maintains structural stability, thus mediating between structural requirements and fast charging performance.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Stability of the object's composition

If existing binder is used in the negative electrode, then the electrode plate structure is stabilized, but the discharging performance in low-temperature environment severely decreases

Engineering Contradiction:

Improveelectrode plate structure stabilityVSAvoiddischarging performance in low-temperature environment

Core Design Contradiction:

Stability of the object's compositionVSProductivity

Solution Approach 1:

The invention changes the binder's chemical composition by incorporating functional groups that remain active at low temperatures. These groups maintain lithium ion conduction capability in cold conditions while the polymer matrix preserves structural stability, thus improving low-temperature discharging performance without sacrificing structural integrity.

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 proposed binder significantly improves the ionic conductivity of the negative electrode, leading to enhanced fast charging and discharging performance of the electrochemical apparatus even in low-temperature environments.

Implementation Method 1

the negative electrode binder has structural formula I... which provides a large number of lithium ion exchange sites to enhance ionic conductivity of the negative electrode binder

Methodology Applied

Scientific EffectIon exchange: Ion Exchange

Data Source

PatentUS20250038254A1Electrochemical apparatus and electronic apparatus including same

Publication Date: 2025.01.30 NINGDE AMPEREX TECHNOLOGY LTD

AI summary

An electrochemical apparatus includes a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and an electrolyte. The negative electrode includes a negative electrode current collector and a negative electrode active material layer disposed on a surface of the negative electrode current collector, where the negative electrode active material layer includes a negative electrode binder with structural formula I. In the technical solution of this application, the negative electrode binder has the structural formula I, which provides a large number of lithium ion exchange sites to enhance ionic conductivity of the negative electrode binder, thereby improving fast charging performance and discharging performance of the electrochemical apparatus in a low-temperature environment.