Porous Solid Electrolyte Membrane for Safer High-Conductivity Batteries
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Solution Overview
Problem
Lithium secondary batteries face challenges in commercialization due to lower ion conductivity of solid electrolytes and unsuitable manufacturing methods, posing safety risks from lithium dendrite growth and mechanical instability.
Innovation Solution
A solid electrolyte membrane with a texture-type support and pores filled with a solid electrolyte, comprising lithium salts, polymers, and oxide-based materials, enhancing ion conductivity and mechanical strength, is developed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte is used to replace liquid electrolyte, then safety is improved (suppression of lithium dendrite growth and prevention of fire/explosion), but ion conductivity deteriorates (lower ion conductivity compared to liquid electrolyte)
Solution Approach 1:
The patent employs composite materials by combining solid electrolyte particles with a polymer matrix to create a composite solid electrolyte membrane. This composite structure allows the material to maintain the safety advantages of solid electrolytes while improving ion conductivity through the synergistic effects of the different components, thereby resolving the contradiction between safety and ion conductivity.
Solution Approach 2:
The patent utilizes porous materials by creating a membrane with a controlled porous structure that allows efficient ion transport pathways. The porous architecture increases the surface area and provides multiple channels for ion conduction, thereby enhancing ion conductivity while maintaining the solid electrolyte's safety benefits, thus resolving the contradiction between these two parameters.
2Quantity of substance
If a solid electrolyte membrane with complex structure is developed to improve ion conductivity, then ion conductivity is improved, but manufacturing complexity increases (manufacturing method not applicable to conventional processes)
Solution Approach 1:
The patent applies universality by developing a solid electrolyte membrane manufacturing process that can be integrated into conventional lithium secondary battery production lines. The membrane structure serves multiple functions (ion conduction, structural support, safety) and the manufacturing method is designed to be compatible with existing equipment and processes, thereby reducing manufacturing complexity while maintaining improved ion conductivity.
Solution Approach 2:
The patent utilizes parameter changes by optimizing variables such as particle size distribution, porosity, and polymer matrix composition to achieve high ion conductivity through conventional manufacturing methods. By adjusting these parameters within standard manufacturing capabilities, the patent improves ion conductivity without requiring complex or specialized manufacturing processes, thus resolving the contradiction between ion conductivity and manufacturing complexity.
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 solid electrolyte membrane improves ion conductivity and mechanical stability, enabling the production of high-energy density all-solid-state batteries suitable for electric vehicles and energy storage systems.
Implementation Method 1
The manufacturing process involves electrospinning a precursor solution to create a fiber-type support
Implementation Method 2
heating, and applying a second precursor solution to fill pores
Data Source
AI summary
Provided are a solid electrolyte membrane, an all-solid-state battery including the same and methods of manufacturing thereof. The solid electrolyte membrane includes a texture-type support having oppositely disposed first side and second side, and having multiple pores inside thereof, and a solid electrolyte filling up the pores and covering at least one side of the support, wherein the support may include a lithium salt, a polymer material or a first solid electrolyte material, or combinations thereof, and show ion conductivity. The solid electrolyte may include a second solid electrolyte material.


