Hybrid Solid Electrolyte Sheet for Battery Flexibility
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Solution Overview
Problem
Sulfide-based solid electrolytes in all-solid-state batteries face challenges due to brittleness, which affects their manufacturing thickness and ionic conductivity, and liquid-type secondary batteries are prone to expansion and ignition risks due to electrolyte decomposition.
Innovation Solution
A solid electrolyte sheet comprising a porous polymer film with a hybrid solid electrolyte layer, including a sulfide-based solid electrolyte and a gel polymer electrolyte with specific acrylate repeating units and ionic sorbate liquids, is developed to enhance flexibility and maintain ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide-based solid electrolyte is used, then high lithium ionic conductivity is achieved, but brittleness increases and manufacturing thickness must be increased
Solution Approach 1:
The patent uses a composite structure combining sulfide-based solid electrolyte particles embedded in a porous polymer matrix. This composite approach allows the system to benefit from the high ionic conductivity of sulfide-based electrolytes while the polymer matrix provides flexibility and reduces brittleness, enabling thinner designs without compromising mechanical strength
Solution Approach 2:
The porous polymer matrix provides a structured framework that accommodates sulfide-based solid electrolyte particles while maintaining mechanical flexibility. The porous structure allows for efficient ion transport pathways and reduces the overall density and brittleness of the electrolyte layer, solving the contradiction between conductivity and mechanical strength
2Stability of the object's composition
If sulfide-based solid electrolyte is used, then stability over wide voltage range is achieved, but thickness must be increased due to brittleness
Solution Approach 1:
The composite structure of sulfide-based solid electrolyte particles in a porous polymer matrix maintains the voltage stability characteristics of sulfide-based materials while the polymer framework enables thinner overall thickness by providing mechanical support and flexibility, eliminating the need for increased thickness to compensate for brittleness
3Quantity of substance
If liquid electrolyte is used, then good energy density is achieved, but expansion and ignition risk increase due to decomposition
Solution Approach 1:
The porous polymer matrix provides a structured framework that accommodates electrolyte materials while maintaining mechanical flexibility. The porous structure allows for efficient ion transport pathways and reduces the overall density and brittleness of the electrolyte layer, solving the contradiction between conductivity and mechanical strength
Solution Approach 2:
The patent uses a composite structure combining sulfide-based solid electrolyte particles embedded in a porous polymer matrix. This composite approach allows the system to benefit from the high ionic conductivity of sulfide-based electrolytes while the polymer matrix provides flexibility and reduces brittleness, enabling thinner designs without compromising mechanical strength
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 hybrid solid electrolyte sheet achieves improved flexibility, reduced brittleness, and maintained ionic conductivity, with the ability to withstand 200 cycles of bending and exhibit electrical conductivity of 5.2×10−4 S/cm at room temperature, addressing the limitations of conventional solid electrolytes.
Implementation Method 1
a gel polymer electrolyte may include a polymer including an acrylate repeating unit and an ionic liquid
Data Source
AI summary
Disclosed are a hybrid solid electrolyte sheet and a method of manufacturing the same. The hybrid solid electrolyte sheet includes a hybrid solid electrolyte layer including a gel polymer electrolyte, thereby securing flexibility and alleviating brittleness. In addition, the hybrid solid electrolyte sheet includes a porous polymer film having a plurality of pores, thus minimizing the content of the acrylate monomer in the pores thereof and providing advantages of maintaining the continuity of the solid electrolyte while minimizing a decrease in ionic conductivity.