Method of manufacturing solid electrolyte membrane, method of manufacturing all-solid-state battery, apparatus for manufacturing solid electrolyte membrane, and apparatus for manufacturing all-solid-state battery
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Solution Overview
Problem
Existing methods for manufacturing solid electrolyte membranes for all-solid-state batteries face issues such as inferior electrical conduction, complex manufacturing processes, and environmental concerns due to the use of harmful solvents, along with durability and resistance problems related to the thickness and porosity of the electrolyte layers.
Innovation Solution
A method involving the formation of a non-woven fabric using laser electrospinning technology, where a slurry containing solid electrolyte particles is applied and dried on the fabric, followed by pressing, to create a thin, high-strength solid electrolyte membrane with improved porosity and contact area for enhanced battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a powder material is used to form the solid electrolyte, then the manufacturing process is simplified, but the electrical conduction becomes inferior due to small contact area between powders
Solution Approach 1:
The invention uses a composite structure combining a porous supporting body with solid electrolyte particles filled in its pores. This composite approach allows the supporting body to provide mechanical strength and structural integrity while the solid electrolyte particles provide electrical conduction pathways, resolving the contradiction between manufacturing simplicity and electrical conduction performance
Solution Approach 2:
The invention employs a porous supporting body with controlled pore size and distribution. The porous structure provides large surface area and numerous pathways for solid electrolyte particle placement, enabling both simplified manufacturing (by providing a pre-formed scaffold) and improved electrical conduction (by creating extensive contact networks among particles)
2Reliability
If the solid electrolyte layer is made thin to reduce resistance, then the charge/discharge performance is improved, but the durability and mechanical strength deteriorate
Solution Approach 1:
The invention segments the solid electrolyte system into two functional components: a porous supporting body that provides mechanical strength and structural framework, and solid electrolyte particles that provide ionic conduction. This segmentation allows the thin-layer design (for low resistance) to be combined with the strong supporting structure (for durability), resolving the contradiction between reduced resistance and maintained mechanical strength
Solution Approach 2:
The porous supporting body acts as a flexible yet strong scaffold that can be designed with optimized thickness and mechanical properties. It provides the necessary mechanical strength while allowing the solid electrolyte particles to form a thin, low-resistance conduction layer within its porous structure
3Reliability
If a non-woven fabric with fine pores is used as support, then the contact area and porosity are improved, but the manufacturing complexity increases
Solution Approach 1:
The invention replaces complex chemical bonding or sintering processes with a simpler physical filling process. The porous supporting body is pre-formed, and solid electrolyte particles are filled into its pores using straightforward techniques, eliminating the need for complex manufacturing steps while achieving high contact area and porosity
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
This approach enables the efficient production of solid electrolyte membranes with improved output characteristics, reduced resistance, and increased durability, leading to better charge/discharge performance and safety in all-solid-state batteries.
Implementation Method 1
a step of forming a non-woven fabric including an ultrafine fiber by a laser electrospinning (LES) process
Implementation Method 2
laser electrospinning (LES) process
Implementation Method 3
a step of drying the slurry on the non-woven fabric by a heater
Data Source
AI summary
A method of manufacturing an all-solid-state battery and an apparatus for manufacturing the same are provided. The method of manufacturing the all-solid-state battery includes: (a) a step of forming a non-woven fabric having a fiber made of a resin; (b) a step of applying a slurry containing solid electrolyte particles onto the non-woven fabric; (c) a step of drying the slurry on the non-woven fabric by a heater; (d) a step of pressurizing the slurry on the non-woven fabric by a roller; (e) a step of forming a positive electrode member on one surface of the solid electrolyte membrane; and (f) a step of forming a negative electrode member on the other surface of the solid electrolyte membrane. The step (a) is a step of forming the non-woven fabric by making a resin containing a polar filler fibrous by a laser electrospinning method. By such a method, the all-solid-state battery (a laminated body of a positive electrode member, a solid electrolyte membrane, and a negative electrode member) can be efficiently manufactured.