Terpene Resin Aqueous Binder for Battery Anodes
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Solution Overview
Problem
Conventional organic binders for lithium ion batteries and supercapacitors, such as PVDF, absorb electrolyte and swell, reducing bond performance, and pose pollution risks due to volatile solvents, while water-based binders like CMC/SBR result in high impedance at the solid electrolyte interface, affecting cycle performance and high-rate charge-discharge capabilities.
Innovation Solution
A terpene resin-based aqueous binder is synthesized through emulsification with a high molecular surfactant and additives like carboxylated cellulose or polyacrylic acid, suitable for lithium ion batteries and supercapacitors, offering improved compatibility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic binders (PVDF) are used, then bond performance is initially good, but the binder absorbs electrolyte and swells, reducing bond performance over time
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by using terpene resin instead of conventional PVDF, and controls the emulsion particle size distribution to optimize performance. This resolves the contradiction by selecting a binder material that does not swell upon electrolyte absorption while maintaining strong bonding.
Solution Approach 2:
The patent creates a composite binder system combining terpene resin emulsion with specific additives (carboxymethyl cellulose, styrene-butadiene rubber latex) to achieve both stable volume and strong bond performance. The composite structure allows each component to contribute its strengths while compensating for individual weaknesses.
2Object-affected harmful factors
If water-based binders (CMC/SBR) are used, then environmental friendliness and cost are improved, but impedance at the solid electrolyte interface increases, affecting cycle performance
Solution Approach 1:
The patent changes the chemical parameters of water-based binders by using terpene resin with specific molecular weight (650-1200) and emulsion particle size distribution (0.1-1.0 μm). These parameter optimizations reduce interface impedance while maintaining the environmental benefits of water-based formulation, thereby improving cycle performance.
Solution Approach 2:
The patent copies the successful structure-property relationships from conventional organic binders and translates them to a water-based terpene resin system, achieving similar or superior performance without the environmental drawbacks of organic solvents.
3Ease of manufacture
If conventional binders are used, then manufacturing process is established, but volatile solvents pose pollution and safety risks
Solution Approach 1:
The patent adopts a water-based terpene resin emulsion that eliminates the need for volatile organic solvents like NMP. The emulsion can be directly applied and dried without complex solvent recovery systems, reducing both pollution and manufacturing complexity while maintaining ease of production.
4Reliability
If terpene resin emulsion is used as binder, then interface impedance is reduced and cycle performance is improved, but binder formulation complexity increases
Solution Approach 1:
The patent applies local quality optimization by carefully controlling the particle size distribution of the terpene resin emulsion (0.1-1.0 μm) and the specific ratios of additives in different regions of the electrode slurry. This localized optimization achieves low interface impedance and high cycle stability while keeping the overall formulation manageable through standardized parameters.
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 terpene resin-based binder reduces interface impedance, enhances high-rate charge-discharge performance, and improves cycle stability of lithium ion batteries and supercapacitors, while being environmentally friendly and cost-effective due to the use of natural terpene resin.
Implementation Method 1
The terpene resin-based aqueous binder is synthesized by the emulsification of terpene resin and a high molecular surfactant
Implementation Method 2
The terpene resin-based binder reduces interface impedance
Data Source
AI summary
A method of preparing an anode of lithium ion batteries or an electrode plate of a supercapacitor. The method includes admixing a terpene resin-based aqueous binder. The terpene resin-based aqueous binder includes a terpene resin emulsion including between 20 and 80 wt. % of a terpene resin, and the terpene resin emulsion has a viscosity of between 2000 and 10000 mPa·s.