Pressure-Sensitive Adhesive Electrolyte for Laminated Cell Assembly
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Solution Overview
Problem
Existing electrolytes for electrochemical systems, such as batteries and electrochromic cells, face challenges including costly and complex assembly processes, thickness fluctuations, and limited dimensional stability, which hinder efficient production and performance.
Innovation Solution
A pressure-sensitive adhesive polymer electrolyte with specific compositions of acrylate monomers, conducting salts, and plasticizers, which can be easily applied and joined to half-cells via lamination, maintaining a defined thickness and exhibiting high ionic conductivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional liquid or solid electrolytes are used, then ionic conductivity can be achieved, but assembly processes become costly and complex requiring mechanical clamping, winding, or chemical curing
Solution Approach 1:
The patent combines the electrolyte function with the adhesive function into a single integrated component. The pressure-sensitive adhesive electrolyte serves both as the ionic conductor and as the bonding agent that adheres half-cells together, eliminating the need for separate assembly processes such as mechanical clamping, winding, or chemical curing steps.
Solution Approach 2:
The electrolyte material is designed to perform multiple functions simultaneously: it provides ionic conductivity for electrochemical operation and acts as a pressure-sensitive adhesive for mechanical bonding of cell components. This multi-functionality simplifies the overall system design and assembly process.
2Ease of operation
If liquid electrolyte is used for assembly, then ease of application is improved, but thickness control becomes poor leading to fluctuations and rejects
Solution Approach 1:
The patent changes the physical state parameter of the electrolyte from liquid to pressure-sensitive adhesive form. This parameter change enables the electrolyte to be applied in a controlled manner with precise thickness definition, while still maintaining ease of application through its inherently adhesive nature that requires no additional curing process.
3Stability of the object's composition
If polymer fraction in electrolyte is increased, then dimensional stability is improved, but ionic conductivity decreases
Solution Approach 1:
The patent employs a composite material system combining polymer matrix with ionic conductive additives or plasticizers. This composite structure allows the polymer to provide dimensional stability while the incorporated conductive components maintain high ionic conductivity, resolving the trade-off between these two properties.
4Stability of the object's composition
If porous film membrane is added to electrolyte layer, then dimensional stability is improved, but process complexity and cost increase
Solution Approach 1:
The patent merges the dimensional stability function previously requiring a separate porous film membrane into the electrolyte material itself. The pressure-sensitive adhesive electrolyte inherently provides the necessary dimensional stability, eliminating the need for additional membrane layers and simplifying the overall structure and manufacturing process.
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 solution enables simplified and cost-effective assembly of electrochemical systems with consistent thickness, improved ionic conductivity, and enhanced stability over a wide temperature range, reducing production complexities and rejects.
Implementation Method 1
The core function of an electrolyte is the ionic conductivity of at least one ionic species
Implementation Method 2
prepared by polymerizing a mixture comprising at least the following components: 5-60 wt % of acrylate monomer from the group of the (meth)acrylic esters having 4-15 carbon atoms, which as a homopolymer would have a Tg of less than -30° C.
Implementation Method 3
which can be easily applied and joined to half-cells via lamination
Data Source
AI summary
A pressure sensitive adhesive polymer electrolyte having a peel adhesion by test A of more than 1 N/cm and an ionic conductivity by test B of more than 10−6 (ohm*cm)−1, prepared by polymerizing:5-60 wt % of acrylate monomer from the group of the (meth)acrylic esters having 4-15 carbon atoms, which as a homopolymer would have a Tg by test C of less than −30° C.,10-80 wt % of acrylate monomer from the group of the (meth)acrylic esters having 4-25 carbon atoms and containing at least one heteroatom, which as a homopolymer would have a Tg by test C of less than 100° C.,0.05-10 wt % of initiator,2-13 wt % of conducting salt,optionally plasticizer,and optionally solvent, which after the polymerization is typically removed at least partly,where optionally one or more of the components are added at least proportionally only during or after the polymerization.