Electrolyte-Resistant Adhesive Tape Binder for Li-Ion Cell Fixation
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Solution Overview
Problem
Adhesive tapes used in lithium-ion batteries suffer from weakened adhesive strength when soaked in electrolyte, leading to manufacturing defects, safety issues, and reduced performance due to electrolyte leakage and swelling.
Innovation Solution
A binder composed of styrene-isoprene-styrene block copolymer, acrylic resin, and polyethylene glycol, with specific mass and molecular weight ratios, is applied to the adhesive tape to enhance electrolyte resistance and adhesive properties, incorporating tackifying resin, antioxidant, and additives for improved stability and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesive tape (PET substrate with acrylate adhesive) is used, then the adhesive tape provides basic insulation and fixation, but the adhesive strength weakens when soaked in electrolyte, causing manufacturing defects and safety issues
Solution Approach 1:
The patent uses a composite binder system comprising SIS block copolymer, acrylic resin, and polyethylene glycol in specific proportions. This composite material combines the adhesive properties of SIS, the polarity and adhesion to polar materials of acrylic resin, and the electrolyte resistance of polyethylene glycol, creating an adhesive layer that maintains strong adhesion in electrolyte environments while providing both polar and non-polar material compatibility
Solution Approach 2:
The patent optimizes the mass percentages of each binder component (SIS: 65-85%, acrylic resin: 15-35%, polyethylene glycol: 5-15%) to achieve the desired balance between adhesive strength and electrolyte resistance. By carefully controlling these compositional parameters, the adhesive tape maintains its bonding performance in the presence of electrolyte without excessive swelling or adhesion loss
2Reliability
If the adhesive tape is soaked in electrolyte, then the adhesive strength is weakened, but the tape may enter the side seal causing safety issues
Solution Approach 1:
The composite binder system provides both strong adhesion and dimensional stability in electrolyte environments. The polyethylene glycol component specifically counteracts swelling, while the SIS and acrylic resin maintain bonding strength, preventing the adhesive tape from deforming or migrating into side seals during battery assembly and operation
3Stability of the object's composition
If the adhesive tape is used in electrolyte environment, then the tape may swell and protrude, but this causes appearance defects
Solution Approach 1:
The patent controls the mass percentage of polyethylene glycol (5-15%) to optimize the balance between electrolyte resistance and dimensional stability. This parameter control ensures that the adhesive layer resists excessive swelling in electrolyte environments, maintaining the intended shape and appearance of the adhesive tape without protrusion or deformation
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 adhesive tape exhibits enhanced electrolyte resistance, insulation, and chemical stability, ensuring effective fixation and insulation of electrode assemblies, thereby improving safety performance and service life of electrochemical apparatus.
Implementation Method 1
the binder demonstrates good adhesion to both non-polar and polar materials
Implementation Method 2
the binder includes the styrene-isoprene-styrene block copolymer, the acrylic resin, and the polyethylene glycol
Implementation Method 3
the binder demonstrates good adhesion to both non-polar and polar materials
Implementation Method 4
the binder includes the styrene-isoprene-styrene block copolymer, the acrylic resin, and the polyethylene glycol
Implementation Method 5
the binder includes the styrene-isoprene-styrene block copolymer, the acrylic resin, and the polyethylene glycol
Data Source
AI summary
An the binder includes a styrene-isoprene-styrene block copolymer, an acrylic resin, and polyethylene glycol. Based on a mass of the binder, a sum of mass percentages of the styrene-isoprene-styrene block copolymer and the acrylic resin ranges from 65% to 85%, and a mass percentage of the polyethylene glycol ranges from 5% to 15%. The binder includes the styrene-isoprene-styrene block copolymer, the acrylic resin, and the polyethylene glycol, and the mass percentages of the styrene-isoprene-styrene block copolymer, the acrylic resin, and the polyethylene glycol are controlled within the above ranges, so that electrolyte resistance and adhesive properties of the binder can be improved.