Ferroelectric Negative Electrode Plate for Fast-Charging Cycle Stability

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Solution Overview

Problem

Secondary batteries face challenges in maintaining high cycle performance and fast-charging capabilities due to lithium deposition, which can lead to reduced energy density and increased risks of short circuits.

Innovation Solution

A negative electrode plate is designed with a ferroelectric layer and specific structural parameters, including compaction density, coating weight, and particle size, to ensure uniform metal ion distribution and inhibit lithium dendrite growth, thereby enhancing cycle performance and fast-charging capabilities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If fast-charging capability is improved, then charging speed increases, but lithium deposition occurs leading to reduced cycle performance

Engineering Contradiction:

Improvecharging speedVSAvoidcycle performance

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

A ferroelectric layer is introduced as an intermediary between the negative electrode current collector and the negative electrode active material. This layer mediates the interaction between lithium ions and the electrode structure, utilizing ferroelectric polarization to regulate lithium ion flux and prevent uneven deposition, thereby resolving the contradiction between fast charging speed and cycle performance

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent optimizes specific parameters including the thickness of the ferroelectric layer (5-20 μm), the compaction density of the negative electrode film layer (1.8-2.2 g/cm³), and the coating weight (0.8-1.2 mAh/cm²). These parameter changes enable the electrode structure to handle fast charging currents while maintaining uniform lithium distribution and preventing dendrite formation

Inventive Principle:

Principle #35Parameter changes

2Productivity

If lithium intercalation capability is enhanced, then charging performance improves, but lithium dendrite formation increases causing safety risks

Engineering Contradiction:

Improvelithium intercalation capabilityVSAvoidlithium dendrite formation

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The ferroelectric layer is applied beforehand to the negative electrode current collector to create a protective interface. This pre-established layer cushions and regulates lithium ion deposition before they reach the active material, preventing the formation of lithium dendrites while maintaining high intercalation capability

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The patent replaces purely mechanical/physical lithium ion accommodation with a ferroelectric field-mediated process. The ferroelectric polarization creates an electric field that actively guides and uniformizes lithium ion distribution, substituting passive mechanical intercalation with an active field-controlled process that prevents dendrite formation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If ferroelectric layer thickness is increased, then ferroelectric effect is enhanced, but interior space of battery is reduced

Engineering Contradiction:

Improveferroelectric effectVSAvoidbattery interior space

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

The patent applies a partial thickness of ferroelectric material (5-20 μm) that is sufficient to generate the necessary ferroelectric effect for regulating lithium ion flux, but not excessive enough to significantly reduce battery interior space. This optimized thickness achieves the functional requirement while minimizing space occupation

Inventive Principle:

Principle #16Partial or excessive 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 solution effectively improves lithium intercalation, reduces lithium dendrite formation, and maintains energy density, ensuring safer and longer-lasting battery performance.

Implementation Method 1

the ferroelectric particles in the ferroelectric layer to exert the full ferroelectric effect and can ensure the uniform distribution of the metal ions at the interface between the negative electrode active material and the electrolyte

Methodology Applied

Scientific EffectFerroelectric effect:

Data Source

PatentUS20250015296A1Negative electrode plate and device including the same

Publication Date: 2025.01.09 CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

AI summary

The present application provides a negative electrode plate and a device including the negative electrode plate. The negative electrode plate includes a negative electrode current collector; a negative electrode film layer on at least one surface of the negative electrode current collector; and a ferroelectric layer; the negative electrode film layer includes a negative electrode active material, and the ferroelectric layer is arranged on the surface of the negative electrode film layer opposite to the negative electrode current collector and includes ferroelectric particles. The negative electrode plate of the present application, when applied to a secondary battery, the fast-charging performance and cycle performance of the secondary battery can be improved.