Acrylic Resin Binder for Battery Negative Electrode Adhesion
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Solution Overview
Problem
Lithium ion secondary batteries face challenges in maintaining high temperature durability and cycle performance due to the swelling of fluorine-based resins used as binders, leading to increased internal resistance and disconnection of electron conduction networks.
Innovation Solution
A nonaqueous electrolyte battery configuration using titanium-including metal oxide particles with a carbon phase on their surface and an acrylic resin binder, where the peel strength between the current collector and the mixed-materials layer exceeds the cutting strength, ensuring robust adhesion and preventing excessive binding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fluorine-based resin (PVdF) is used as binder in negative electrode, then binding strength is improved, but high temperature cycle performance deteriorates due to swelling and electron conduction disconnection
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by using acrylic resin with specific functional groups (carboxyl, hydroxyl, amine) instead of fluorine-based resin, and controls the molecular weight and composition ratios to achieve both strong binding and thermal stability without swelling
Solution Approach 2:
The patent creates a composite binder system using acrylic resin combined with specific additives and controls the composite structure to maintain electron conduction network integrity while providing strong binding, thereby resolving the contradiction between binding strength and high temperature cycle performance
2Temperature
If acrylic resin is used as binder instead of fluorine-based resin, then high temperature resistance is improved, but adhesion to current collector may be insufficient
Solution Approach 1:
The patent introduces functional groups with different local binding characteristics at specific positions within the acrylic resin structure, enabling strong adhesion to current collector at the interface while maintaining high temperature resistance in the bulk material
Solution Approach 2:
The patent optimizes molecular weight parameters and functional group content in the acrylic resin to simultaneously achieve adequate adhesion strength and high temperature resistance, resolving the contradiction between these two properties
3Temperature
If negative electrode materials are optimized for high temperature performance, then high temperature durability is improved, but low temperature performance may deteriorate
Solution Approach 1:
The patent selects acrylic resin with specific molecular weight range and functional group content that provides thermal stability at high temperatures while maintaining flexibility and ion conductivity at low temperatures, achieving broad temperature adaptability
Solution Approach 2:
The patent creates a composite electrode material system where acrylic resin binder works synergistically with titanium-including metal oxide and carbon material to achieve both high temperature durability and low temperature performance through complementary properties
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 battery's high temperature durability and cycle performance by maintaining electron conduction networks and preventing peeling of the electrode layers, thereby improving overall battery reliability.
Implementation Method 1
network of an electron conduction of the negative electrode is disconnected
Implementation Method 2
a binder for binding the negative electrode active materials to each other and for binding the negative electrode active material and the current collector
Implementation Method 3
a titanium-including metal oxide particle capable of having lithium ions inserted into and extracted from
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
According to one approach, a nonaqueous electrolyte battery (10) including a negative electrode (3) that includes a negative electrode current collector (3a) and a negative electrode mixed-materials layer (3b) is provided. The negative electrode mixed-materials layer (3b) includes a titanium-including metal oxide particle that includes a phase including a carbon material on a surface and a binder that includes an acrylic resin. The negative electrode (3) satisfies Equation (I): α/β>6 α is a peel strength (kN/m) between the negative electrode current collector (3a) and the negative electrode mixed-materials layer (3b), and β is a cutting strength (kN/m) in the negative electrode mixed-materials layer (3b).