Solid Electrolyte Membrane with Fiberized Binder Network
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Solution Overview
Problem
Existing all-solid-state batteries face challenges in achieving both sufficient ionic conductivity and strength due to the use of solid electrolytes, often resulting in degraded performance and processability.
Innovation Solution
A method involving a solvent-free calendering process is employed to prepare a solid electrolyte membrane by mixing sulfide-based or halide-based solid electrolyte particles with a fibrous binder, controlling temperature, orientation, and loop to form a three-dimensional network structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte is used in an all-solid-state battery, then safety is improved by avoiding flammable solvents, but ionic conductivity is lowered
Solution Approach 1:
The patent uses composite materials by combining solid electrolyte particles with a fibrous binder to create a membrane that maintains both safety and ionic conductivity. The binder forms a three-dimensional network structure that facilitates ion transport while the solid electrolyte particles provide the safe, non-flammable electrolyte function.
Solution Approach 2:
The patent employs porous materials by creating a membrane structure with voids and channels through the fibrous binder network. This porous structure allows efficient ion transport pathways while maintaining the solid electrolyte's safety benefits, resolving the contradiction between safety and ionic conductivity.
2Use of energy by moving object
If a liquid electrolyte is used together with solid electrolyte to secure ionic conductivity, then ionic conductivity is improved, but strength is lowered
Solution Approach 1:
The patent replaces the liquid electrolyte system with a solid-based system that uses a fibrous binder network to provide both mechanical strength and ionic conductivity. The binder's fiber structure provides mechanical integrity while its network configuration enables ion transport, eliminating the need for liquid electrolyte additives.
Solution Approach 2:
The patent changes the physical state and structural parameters by using a fibrous binder with specific fiber diameter ratios (5:1 to 50:1) and controlling the volume ratio of solid electrolyte particles to binder. These parameter changes enable the membrane to achieve both sufficient strength and ionic conductivity without liquid electrolyte.
3Use of energy by moving object
If the calendering process is performed with optimized temperature, orientation, and loop, then ionic conductivity and strength are improved, but process complexity increases
Solution Approach 1:
The patent optimizes specific process parameters including calendering temperature (50°C to 200°C), orientation (uniaxial or biaxial), and loop count (5 to 50 loops). By systematically controlling these parameters, the process achieves high ionic conductivity and strength while maintaining reasonable process complexity through defined parameter ranges.
Solution Approach 2:
The patent performs preliminary mixing of solid electrolyte particles and binder before calendering to ensure uniform distribution. This preliminary action simplifies the subsequent calendering process by reducing the need for extensive optimization and ensuring consistent results within the specified parameter ranges.
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 method enhances ionic conductivity to 0.5 to 10 S/cm and tensile strength to 45 to 1000 kPa, improving the overall performance and processability of the solid electrolyte membrane.
Implementation Method 1
a temperature of the calendering process is 50°C to 200°C
Implementation Method 2
applying the mixture obtained in step (S1) to a calendering process to mold the mixture into a film form
Implementation Method 3
the binder is fiberized by the mixing
Data Source
Figure 1~2a
Figure 2b~2c
Figure 3a
AI summary
Methods for preparing a solid electrolyte membrane are described. More particularly, a small amount of binder may be fiberized through a dry calendering process to prepare a solid electrolyte membrane. Since the fiberized binder is included in an entangled state within the solid electrolyte membrane, it shows excellent characteristics in both ionic conductivity and strength.