Rechargeable Lithium Battery Composite Pouch Structure
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Solution Overview
Problem
Pouch-type rechargeable lithium batteries face challenges with external physical impact resistance and internal resistance, which can lead to deformation, damage, and reduced performance, especially when using liquid electrolytes.
Innovation Solution
A rechargeable lithium battery design incorporating a positive electrode with lithium-intercalating material, a carbon-based negative electrode with a water-soluble binder, and a polymer electrolyte composed of a specific polymerization product of monomers, along with a non-aqueous organic solvent and lithium salt, to enhance strength and capacity while maintaining safety and high-temperature stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the physical strength of the battery is increased to improve resistance against external physical impact, then the resistance to external physical impact is improved, but the battery performance is deteriorated due to an increase in internal resistance
Solution Approach 1:
The patent uses a composite pouch structure comprising an outer pouch and an inner pouch, where the outer pouch provides mechanical strength and impact resistance while the inner pouch contains the electrolyte solution. This composite structure allows the battery to maintain both high physical strength for impact resistance and good battery performance by separating the structural function from the electrochemical function.
2Adaptability or versatility
If a pouch-type battery container is used to increase flexibility and size, then the shape flexibility and size are improved, but the battery is easily deformed and damaged by external physical impact and may be swollen when exposed to high temperatures
Solution Approach 1:
The patent employs a composite pouch structure with an outer pouch made of materials providing high strength and impact resistance, and an inner pouch containing the electrolyte. This composite design enables the battery to maintain shape flexibility and increased size while simultaneously improving resistance to external physical impact and high-temperature stability.
3Reliability
If a liquid electrolyte solution is used to achieve high ionic conductivity, then the ionic conductivity is improved, but the battery is more susceptible to deformation and damage from external physical impact and high-temperature exposure
Solution Approach 1:
The patent uses a composite pouch structure where the inner pouch contains the liquid electrolyte solution, providing high ionic conductivity, while the outer pouch provides mechanical protection against external physical impact and high-temperature exposure. This composite design allows the battery to maintain both high ionic conductivity and resistance to harmful external factors.
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 battery exhibits improved resistance to external physical impact, increased capacity, and superior performance by optimizing the polymer electrolyte composition and binder usage, resulting in a stronger and more efficient lithium-ion battery.
Implementation Method 1
a polymer electrolyte including a polymer, a non-aqueous organic solvent and a lithium salt
Implementation Method 2
a positive electrode including a positive active material capable of intercalating and deintercalating lithium
Data Source
AI summary
A rechargeable lithium battery includes a positive electrode including a positive active material being capable of intercalating or deintercalating lithium; a negative electrode including a carbon-based negative active material and a water-soluble binder; and a polymer electrolyte including a polymer, a non-aqueous organic solvent and a lithium salt, wherein the polymer comprises a polymerization product of a first monomer represented by Chemical Formula 1 with a second monomer which is one or more of monomers represented by Chemical Formulae 2 to 7:A-U—B Chemical Formula 1CH2═CL1-C(═O)—O-M Chemical Formula 2CH2═CL1-O-M Chemical Formula 3CH2═CL1-O—C(═O)-M Chemical Formula 4CH2═CH—CH2—O-M Chemical Formula 5CH2═CH—S(═O)2-M Chemical Formula 6CH2═CL1-C(═O)—O—CH2CH2—NH—C(═O)—O-M Chemical Formula 7wherein, definition of each substituent group is as described in detailed description.