Silicon-Dominant Anode Binders Using Aqueous PAA Polymer Blends

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional battery electrodes for lithium-ion batteries are costly, cumbersome, and inefficient, particularly due to the use of toxic organic solvents and non-conducting binders, which limit the performance and scalability of silicon-dominant anodes.

Innovation Solution

The use of water-soluble PAA-based polymer binders, specifically blends with phenolic resin, which are environmentally friendly, facilitate the production of silicon-dominant anodes through roll-to-roll fabrication, eliminating the need for toxic solvents and providing a carbon matrix that enhances electrical conductivity and mechanical stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic solvents and non-conducting binders are used in battery electrode fabrication, then the electrode structure can be formed, but the process becomes costly, cumbersome, and environmentally harmful while limiting battery lifetime and performance

Engineering Contradiction:

Improvebattery lifetimeVSAvoidtoxic organic solvents

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the solvent parameter from organic (NMP, DMF) to water-based, eliminating toxic harmful factors. This parameter change maintains the binder's ability to form electrode structure while removing environmental and health hazards associated with conventional organic solvents

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite polymer binders combining water-soluble polymers (carboxymethyl cellulose, polyacrylic acid, polyvinyl alcohol) with conductive materials (graphene, carbon nanotubes, conductive polymers). This composite approach provides both binding functionality and electrical conductivity, improving battery lifetime while eliminating toxic solvents

Inventive Principle:

Principle #40Composite materials

2Use of energy by moving object

If conventional non-conducting binders are used, then the electrode can be assembled, but electrical conductivity and energy density are limited

Engineering Contradiction:

Improveenergy densityVSAvoidnon-conducting binders

Core Design Contradiction:

Use of energy by moving objectVSObject-generated harmful factors

Solution Approach 1:

The patent develops composite binders that integrate conductive materials (graphene, carbon nanotubes, conductive polymers like polyaniline and polythiophene) with water-soluble polymer matrices. This composite structure provides both mechanical binding and electrical conductivity, eliminating the harmful effect of non-conducting binders while increasing energy density

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent creates multi-functional binders that simultaneously perform binding, conducting electricity, and providing structural support. This eliminates the need for separate conducting additives and improves energy density by making the binder itself functional rather than parasitic

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If complex fabrication processes are used, then electrode performance can be optimized, but manufacturing becomes time-consuming and costly

Engineering Contradiction:

Improveelectrode performanceVSAvoidfabrication process

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent simplifies fabrication by changing the solvent parameter to water, which eliminates the need for complex solvent recovery systems and high-temperature drying processes. Water-based binders can be applied at room temperature and dry naturally, making the process easier to manufacture while maintaining electrode performance

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The water-soluble binders provide self-binding functionality without requiring additional crosslinking agents or complex curing processes. The binders naturally form cohesive electrode structures through water evaporation, eliminating multiple processing steps and reducing manufacturing complexity

Inventive Principle:

Principle #25Self-service

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 improved cycle life, fast charging capabilities, and increased energy density for lithium-ion batteries, while reducing production costs and environmental impact by using aqueous-based processing.

Implementation Method 1

the electrode coating layer formed from silicon and a pyrolyzed water-based phenolic-PAA polymer binder

Methodology Applied

Scientific EffectPyrolysis: Pyrolysis

Data Source

PatentUS20230299294A1Water soluble PAA-based polymer blends as binders for si dominant anodes

Publication Date: 2023.09.21 ENEVATE CORP

AI summary

Systems and methods utilizing water soluble (aqueous) PAA-based polymer binders for silicon-dominant anodes may include an electrode coating layer on a current collector, where the electrode coating layer is formed from silicon and a pyrolyzed water soluble PAA-based polymer blend, wherein the water soluble PAA-based polymer blend comprises PAA and one or more additional water-soluble polymer components. The electrode coating layer may include more than 70% silicon and the anode may be in a lithium ion battery.