Hybrid Solid Electrolyte Composition for Low-Resistance Batteries
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Solution Overview
Problem
Current solid electrolytes for secondary batteries face challenges with low ion conductivity at room temperature and high interfacial resistance, while liquid electrolytes have issues with inflammability and thermal stability.
Innovation Solution
A hybrid solid electrolyte is developed, comprising a hybrid film with 85-95% ion conductive ceramic and 5-15% polymer, impregnated with a liquid electrolyte containing lithium or sodium ions and an ionic liquid, enhancing ion conductivity and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a solid electrolyte is used to improve thermal stability, then thermal stability is improved, but ion conductivity at room temperature becomes low
Solution Approach 1:
The patent uses a composite structure consisting of a solid electrolyte layer (ceramic-polymer composite) and a liquid electrolyte layer. The solid electrolyte layer provides thermal stability while the liquid electrolyte layer maintains high ion conductivity at room temperature. This composite approach allows both materials to contribute their advantageous properties simultaneously.
Solution Approach 2:
The patent applies different electrolyte types in different regions: the solid electrolyte layer is positioned to provide thermal stability where heat resistance is critical, while the liquid electrolyte layer is positioned to ensure high ion conductivity where ionic transport is most needed. This spatial differentiation of material properties optimizes overall battery performance.
2Temperature
If a solid electrolyte is used to improve stability, then thermal stability is improved, but interfacial resistance with electrode becomes high
Solution Approach 1:
The hybrid electrolyte structure combines solid and liquid electrolytes, where the liquid electrolyte layer specifically addresses interfacial resistance issues by providing excellent wetting properties and low resistance at the electrode interface, while the solid electrolyte layer maintains thermal stability.
Solution Approach 2:
The liquid electrolyte layer acts as an intermediary between the solid electrolyte and the electrode, facilitating efficient ionic transport at the interface while the solid electrolyte provides the thermal stability backbone. This intermediary layer resolves the interfacial resistance problem without compromising the thermal stability provided by the solid component.
3Reliability
If a liquid electrolyte is used to improve ion conductivity, then ion conductivity is improved, but inflammability increases and thermal stability decreases
Solution Approach 1:
The patent creates a hybrid electrolyte system where the liquid electrolyte component provides high ion conductivity while the solid electrolyte component provides thermal stability and flame resistance. The combination allows the battery to achieve the ion conductivity benefits of liquid electrolytes without their associated safety hazards.
Solution Approach 2:
The patent converts the potential harm of using liquid electrolytes (inflammability) by combining them with solid electrolytes that provide flame resistance. The liquid electrolyte's high ion conductivity is preserved while its harmful flammability characteristic is neutralized by the solid electrolyte component, effectively converting a harmful property into a manageable design parameter.
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 achieves high thermal stability above 400°C, low interfacial resistance, and improved electrochemical stability, leading to enhanced performance in secondary batteries with increased discharge capacity and stability.
Implementation Method 1
the hybrid film is impregnated with the liquid electrolyte
Implementation Method 2
a liquid electrolyte including (i) an ion compound selected from the group consisting of lithium ions and sodium ions and (ii) a solvent, wherein the solvent includes an ionic liquid
Data Source
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AI summary
Provided is a hybrid solid electrolyte comprising: a hybrid film including (i) 60 to 100 parts by weight of an ion conductive ceramic and (ii) 1 to 40 parts by weight of a polymer; and a liquid electrolyte including (i) an ion compound selected from the group consisting of lithium ions and sodium ions and (ii) a solvent, wherein the hybrid film is impregnated with the liquid electrolyte.