Anode Binder Composition for Stable High-Loading Battery Slurries
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Solution Overview
Problem
The stability of the slurry phase of anode mixtures for secondary batteries is compromised when the content of anode active material is increased, leading to desorption and contamination issues during the manufacturing process, as conventional binders like styrene butadiene latex (SBL) and sodium carboxymethyl cellulose (CMC) become insufficient.
Innovation Solution
A new binder composition comprising hydrophobically modified alkali soluble emulsion (HASE) and a copolymer derived from acrylamide (AAM), acrylic acid (AA), and acrylic nitrile (AN) monomers is used, with a specific content range of 3 to 10 wt% in the anode mixture, replacing SBL and CMC to enhance adhesion and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the content of anode active material is increased to improve capacity and efficiency, then the capacity and efficiency of secondary battery are improved, but the slurry phase stability deteriorates causing desorption and contamination
Solution Approach 1:
The patent changes the chemical composition parameters of the binder from conventional SBL and CMC to a novel polymer comprising carboxyl groups, hydroxyl groups, and amine groups. This parameter change in binder chemistry enables the slurry to maintain stability even when anode active material content is increased to 90-99 wt%, as the new binder provides superior adhesion and phase stability through its multifunctional groups.
Solution Approach 2:
The patent employs a composite binder structure combining multiple functional groups (carboxyl, hydroxyl, and amine groups) within a single polymer system. This composite approach creates a binder that can simultaneously provide adhesion, dispersancy, and structural stability, allowing high active material content (90-99 wt%) to be maintained without slurry phase instability or desorption issues.
2Quantity of substance
If the content of SBL and CMC is decreased to increase anode active material content, then the capacity and efficiency are improved, but the adhesion and binding strength deteriorate
Solution Approach 1:
The patent fundamentally changes the binder parameters by introducing a novel polymer with carboxyl groups, hydroxyl groups, and amine groups. This chemical parameter change provides superior adhesion strength compared to conventional SBL and CMC, enabling the binder to maintain strong binding even at reduced concentrations when active material content is increased to 90-99 wt%.
Solution Approach 2:
The composite binder structure integrating carboxyl, hydroxyl, and amine groups creates a multifunctional binding system. The carboxyl groups provide coordination bonding, hydroxyl groups enhance hydrogen bonding, and amine groups contribute to chelation, collectively delivering superior adhesion strength that allows reduced binder content while maintaining or improving overall binding performance.
3Ease of manufacture
If conventional binders SBL and CMC are used, then the manufacturing process is simple and familiar, but the slurry phase becomes unstable and defects occur in subsequent processes
Solution Approach 1:
The patent changes the binder chemical composition from conventional SBL and CMC to a novel polymer with carboxyl, hydroxyl, and amine groups. This parameter change significantly improves slurry phase stability and prevents desorption defects in subsequent rolling and drying processes, while the manufacturing procedure remains similarly simple and scalable.
Solution Approach 2:
The patent uses a binder composition that can be easily prepared and applied in the manufacturing process, replacing complex multi-component conventional binders with a single multifunctional polymer system. This simplifies the manufacturing process while reliably preventing slurry instability and process defects.
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 new binder composition improves initial adhesion, reduces desorption, lowers initial resistance, and enhances the lifespan of secondary batteries by stabilizing the anode mixture, thus addressing the instability issues caused by high active material content.
Implementation Method 1
The new binder composition improves initial adhesion, reduces desorption, lowers initial resistance, and enhances the lifespan of secondary batteries by stabilizing the anode mixture
Data Source
AI summary
The present disclosure relates to an anode mixture for a secondary battery, an anode and a secondary battery including the same. Specifically, in one embodiment of the present disclosure, there is provided an anode mixture for a secondary battery including a binder composition, which is a mixture of an AAM/AA/AN copolymer and HASE, in a specific content range.