In-Situ Gel Polymer Electrolyte for Rechargeable Battery Leakage
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Solution Overview
Problem
The existing production process for gel polymer electrolytes in lithium ion polymer batteries is complex and prone to electrolyte leakage, which affects the reliability and longevity of the batteries.
Innovation Solution
A precursor composition comprising a modified bismaleimide oligomer, polymerizable monomers, a mixture of solvents with high and low dielectric constants, lithium salts, and a free radical initiator is injected into an aluminum battery shell, where it undergoes in-situ heating polymerization to form a cross-linked gel polymer electrolyte, simplifying the manufacturing process and enhancing electrolyte retention and ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional production process for gel polymer electrolyte is used, then the electrolyte can be formed in the battery, but the production process becomes complex and electrolyte leakage occurs
Solution Approach 1:
The patent combines the electrolyte formation and gel polymerization steps into a single in-situ process. The liquid electrolyte precursor and polymerizable monomers are injected together into the battery shell, and both the electrolyte and gel polymer form simultaneously through heating polymerization, eliminating the need for separate electrolyte filling and polymer film formation steps.
Solution Approach 2:
The patent performs preliminary action by injecting the liquid electrolyte precursor and polymerizable monomers into the battery shell before final assembly and sealing. This allows the electrolyte and gel polymer to form in-situ within the sealed battery, preventing electrolyte leakage and simplifying the production process.
2Weight of moving object
If gel polymer materials are used to reduce battery size and increase flexibility, then the battery can be made ultra-thin and lightweight, but the production process becomes complex
Solution Approach 1:
The patent merges the electrolyte formation and gel polymerization steps into a single in-situ process. The liquid electrolyte precursor and polymerizable monomers are injected together into the battery shell, and both the electrolyte and gel polymer form simultaneously through heating polymerization, eliminating the need for separate electrolyte filling and polymer film formation steps.
Solution Approach 2:
The patent changes the physical state parameter of the electrolyte from solid gel polymer film to liquid precursor that polymerizes in-situ. This allows the electrolyte to be injected in liquid form and then transformed into gel polymer within the sealed battery, simplifying the production process while maintaining the lightweight and flexible characteristics.
3Ease of manufacture
If in-situ heating polymerization is used, then the production process is simplified and electrolyte retention is improved, but heating is required to initiate polymerization
Solution Approach 1:
The patent changes the physical state parameter of the electrolyte from solid gel polymer film to liquid precursor that polymerizes in-situ. This allows the electrolyte to be injected in liquid form and then transformed into gel polymer within the sealed battery, simplifying the production process while maintaining the lightweight and flexible characteristics.
Solution Approach 2:
The patent uses a free radical initiator as an intermediary to facilitate the polymerization reaction at lower temperatures. The initiator decomposes upon heating to generate free radicals that trigger the polymerization of the monomers, enabling the process to occur at moderate temperatures rather than requiring extreme heat.
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 results in a reliable gel polymer electrolyte with high solubility to lithium salts and ion conductivity, improving the battery's lifespan and ease of production by eliminating electrolyte leakage and reducing the complexity of the manufacturing process.
Implementation Method 1
a free radical initiator; and (E) additives... the precursor undergoes in-situ heating polymerization by heating and forms a gel polymer electrolyte... wherein the polymerization temperature is at 30 ∼130° C., and the two monomers/oligomers in the polymer precursors form cross-linked type copolymers
Implementation Method 2
the resulting bridge structure is capable of keeping the solvent inside the battery, so that the electrolyte retainability is good
Implementation Method 3
a lithium dissociable salt such as LiPF6, and LiBF4, etc... the electrolyte has a high solubility to the lithium salt and a high ion conductivity
Data Source
AI summary
The present invention is directed to a gel polymer electrolyte for use in rechargeable polymer secondary batteries and a precursor composition thereof. The precursor composition can be injected into an aluminum shell of a battery cell, which undergoes in-situ heating polymerization by heating and forms a gel polymer electrolyte penetrating a partition membrane therein. The precursor composition contains (meth)acrylic (acrylate) monomers and a modified bismaleimide oligomer resulting from a reaction of barbituric acid and bismaleimide.