Anode Binder Composition to Prevent Hydrogen Gas in Slurry
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current polymeric binders for lithium-ion battery anodes face challenges in achieving high energy density, preventing hydrogen gas generation during aqueous slurry preparation, and ensuring excellent service life, which are crucial for large-scale battery production and performance.
Innovation Solution
The development of electrode forming compositions that include a polymeric binder comprising non-ionic monoethylenically unsaturated monomers, oxyalkylated monomers, and ethylenically unsaturated ionic monomers, along with crosslinking agents, which provide low resistivity, good adhesion, and prevent hydrogen gas generation, enabling the formation of electrodes with high energy density and extended service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If traditional polymeric binders (e.g., SBR latex) are used for anode fabrication, then the binder provides basic binding function, but hydrogen gas is generated during aqueous slurry preparation with amorphous silicon
Solution Approach 1:
The patent changes the chemical parameters of the binder by incorporating oxyalkylated monomers (containing ether oxygens) and ionic monomers (carboxylate, sulfonate, sulfate, phosphate, or acid groups) to fundamentally alter the binder's interaction with amorphous silicon, preventing hydrogen gas generation through modified chemical composition rather than physical conditions
Solution Approach 2:
The patent creates a composite binder system combining multiple functional monomers (non-ionic monoethylenically unsaturated, oxyalkylated, and ethylenically unsaturated ionic monomers) to achieve synergistic effects that simultaneously prevent hydrogen gas generation, enhance adhesion, and improve service life
2Use of energy by moving object
If amorphous silicon is used as anode active material to increase energy density, then energy density is improved, but hydrogen gas generation occurs during aqueous slurry preparation
Solution Approach 1:
The patent introduces the specialized polymeric binder as an intermediary between the amorphous silicon particles and the aqueous slurry environment, where the binder's functional groups mediate the interaction to prevent hydrogen gas generation while maintaining the energy density benefits of silicon
3Reliability
If conventional binders are used, then manufacturing is simple, but adhesion and service life are insufficient for high energy density applications
Solution Approach 1:
The patent modifies the binder's chemical parameters by incorporating ionic monomers that can form strong electrostatic and hydrogen bonding interactions, fundamentally enhancing adhesion strength and service life despite the increased compositional complexity
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 composition effectively prevents hydrogen gas generation during amorphous silicon-containing water-borne slurry preparation, enhances adhesion, and improves the overall performance and durability of lithium-ion battery anodes, addressing the limitations of traditional binders.
Implementation Method 1
The function of the polymeric binder is to bind the electrode-forming particulates together onto the current collector
Implementation Method 2
at least one crosslinking agent capable of reacting with the polymeric binder
Data Source
AI summary
An electrode forming composition for use as the active material layer on a current collector of an electrode within a non-aqueous electrical energy storage device is provided. The electrode forming composition includes a) at least one particulate electrode-forming material, b) a polymeric binder. The polymeric binger includes at least one non-ionic monoethylenically unsaturated monomer and at least one particular oxyalkylated monomer with ethylenic unsaturation and terminated by hydrogen or an aryl or alkyl chain.