Electrode Composite Particles Bonding for Low Resistance

Solution Overview

Problem

Existing electrochemical element electrodes, such as those for lithium ion secondary batteries and electric double layer capacitors, face challenges in achieving low internal resistance and high capacitance due to the crushing of composite particles under pressure, leading to high internal resistance and small capacitance.

Innovation Solution

The development of an electrochemical element electrode with a structure where composite particles comprising electrode active material, electric conductive material, dispersible binder, and soluble resin are bonded together without crushing, maintaining their network structure and allowing easy electrolyte permeation, resulting in low resistance and high capacitance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If composite particles are formed by bonding electrode active materials and electric conductive materials, then the electrode structure is improved for better performance, but the particles are crushed under pressure during formation, leading to high internal resistance and small capacitance

Engineering Contradiction:

Improveinternal resistanceVSAvoidparticle strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent applies composite materials by combining electrode active materials, electric conductive materials, and binder materials to form composite particles with enhanced mechanical strength. This composite structure prevents particle crushing under pressure while maintaining low internal resistance and high capacitance, directly resolving the contradiction between particle strength and electrical performance

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the physical and chemical parameters of the composite particles, specifically optimizing the bonding strength, particle size distribution, and material composition ratios. These parameter adjustments enable the particles to withstand formation pressure without crushing, while maintaining excellent electrical conductivity and capacitance characteristics

Inventive Principle:

Principle #35Parameter changes

2Reliability

If composite particles are formed by bonding electrode active materials and electric conductive materials, then the electrode structure is improved for better performance, but the particles are crushed under pressure during formation, leading to small capacitance

Engineering Contradiction:

ImprovecapacitanceVSAvoidparticle strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent applies composite materials by combining electrode active materials, electric conductive materials, and binder materials to form composite particles with enhanced mechanical strength. This composite structure prevents particle crushing under pressure while maintaining low internal resistance and high capacitance, directly resolving the contradiction between particle strength and electrical performance

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the physical and chemical parameters of the composite particles, specifically optimizing the bonding strength, particle size distribution, and material composition ratios. These parameter adjustments enable the particles to withstand formation pressure without crushing, while maintaining excellent electrical conductivity and capacitance characteristics

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

This approach results in an electrode with low internal resistance and high capacitance, suitable for applications in electric double layer capacitors and secondary batteries, enabling efficient energy storage and conversion.

Implementation Method 1

each of the composite particles comprises an electrode active material, an electric conductive material, a dispersible binder and a soluble resin, and in which the electrode active material and the electric conductive material are bonded by the dispersible binder

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 2

each of the composite particles comprises an electrode active material, an electric conductive material, a dispersible binder and a soluble resin

Methodology Applied

Scientific EffectDissolution: Solvation

Implementation Method 3

the structure of the composite particles is maintained, and applied the obtained electrode to an electrochemical element, and accordingly, the present inventors have found the electrochemical element is small in internal resistance and large in capacity

Methodology Applied

Scientific EffectPermeation: Permeation

Data Source

PatentUS8119289B2Electro-chemical element electrode

Publication Date: 2012.02.21 ZEON CORP

AI summary

An electrochemical element electrode for obtaining electrochemical elements having both low internal resistance and high capacitance, and a secondary battery and an electric double layer capacitor using the electrode are provided.An electrochemical element electrode which is made by forming an active material layer on a collector, and the active material layer is formed by press-molding composite particles with high strength at moderate pressure not to crush the composite particles under pressure, while the structures of the composite particles being maintained, to bond the composite particles together, wherein the composite particles comprise an electrode active material, an electric conductive material, a dispersible binder and a soluble resin, in which the electrode active material and the electric conductive material are bonded by the dispersible binder. By use of this electrode, an electric double layer capacitor or a secondary battery is obtained.