Positive Electrode Lead Member Attachment via Carbon Interlayer

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional electrochemical devices face challenges in producing positive electrodes with conductive polymers, as the process of exposing the positive current collector surface can damage the carbon and conductive polymer layers, leading to reduced reliability and adhesiveness between the lead member and the current collector.

Innovation Solution

The electrochemical device positive electrode includes a carbon layer with a conductive carbon material on a positive current collector, an active layer containing a conductive polymer supported by the carbon layer, and a lead member attached to the exposed carbon layer, reducing contact resistance and improving adhesiveness by forming a conduction path through the carbon layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the process of exposing the positive current collector surface is performed to attach a lead member, then the lead member can be attached to the positive electrode, but the carbon layer and conductive polymer layer are damaged, leading to reduced reliability and adhesiveness

Engineering Contradiction:

Improvelead member attachmentVSAvoidpositive electrode reliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent introduces an intermediary layer (exposed carbon layer) between the lead member and the positive current collector. This intermediary layer serves as a mediator that allows the lead member to be attached without directly exposing and damaging the conductive polymer layer and current collector surface, thereby maintaining reliability while enabling manufacture

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If the carbon layer and conductive polymer layer are removed to expose the positive current collector surface, then the lead member can be attached, but adhesiveness between the lead member and current collector is reduced

Engineering Contradiction:

Improvelead member attachmentVSAvoidadhesiveness between lead member and current collector

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The exposed carbon layer acts as an intermediary that provides a bonding interface between the lead member and the positive electrode. This intermediary structure maintains strong adhesiveness by preserving the carbon layer's bonding properties while still allowing lead member attachment

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent utilizes the composite structure of the carbon layer and conductive polymer layer, where the exposed carbon layer provides both mechanical bonding strength for the lead member and maintains electrical conductivity. This composite approach ensures both adhesiveness and functional performance

Inventive Principle:

Principle #40Composite materials

3Ease of manufacture

If the carbon layer and conductive polymer layer are removed to expose the positive current collector surface, then the lead member can be attached, but contact resistance increases

Engineering Contradiction:

Improvelead member attachmentVSAvoidcontact resistance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The exposed carbon layer serves as an intermediary conductive path between the lead member and the positive current collector. This intermediary maintains low contact resistance by providing a continuous conductive route without requiring direct exposure of the current collector surface

Inventive Principle:

Principle #24Intermediary (Mediator)

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

This configuration enhances the reliability of the positive electrode, increases the connection strength between the lead member and the current collector, and improves the power collection properties by reducing contact resistance and enhancing adhesiveness.

Implementation Method 1

The carbon layer is formed on a surface of the positive current collector, and contains a conductive carbon material. The lead member is in contact with the carbon layer.

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

Since a positive electrode containing a conductive polymer allows the Faraday reaction to proceed in association with adsorption (doping) and desorption (dedoping) of an anion, the positive electrode has small reaction resistance and has higher output

Methodology Applied

Scientific EffectFaraday reaction: Electrolysis

Data Source

PatentUS11063324B2Positive electrode with lead member for electrochemical devices, method for producing same and electrochemical device

Publication Date: 2021.07.13 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

An electrochemical device positive electrode with a lead member includes a positive electrode and a lead member attached to the positive electrode. The positive electrode includes a positive current collector, a carbon layer, and an active layer. The carbon layer is disposed on a surface of the positive current collector, and contains a conductive carbon material. The active layer is supported by the positive current collector via the carbon layer disposed between the active layer and the positive current collector, and contains a conductive polymer. The lead member is in contact with the carbon layer.