Flexible Solid Electrolyte for High-Voltage All-Solid-State Lithium Batteries
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium batteries using liquid electrolytes are chemically unstable at high voltages, prone to leakage and fire, while all-solid-state batteries with brittle solid electrolytes have low ionic conductivity and are not flexible, making them unsuitable for high-voltage applications.
Innovation Solution
A flexible solid electrolyte is developed with an inorganic-organic composite electrolyte layer sandwiched between two inorganic protective layers, enhancing electrochemical stability, ionic conductivity, and flexibility, allowing for safe and efficient operation in high-voltage lithium batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If liquid electrolyte is used in lithium battery, then high voltage operation is possible, but chemical stability deteriorates and safety risks (leakage, fire) increase
Solution Approach 1:
The patent employs a composite electrolyte structure consisting of an inorganic electrolyte layer (e.g., LiNbO3, Li2SiO3) combined with an organic electrolyte layer (e.g., PEO-LiClO4 complex). This composite structure enables the battery to operate at high voltages (4.8-5.0V) while maintaining chemical stability, as the inorganic component provides voltage stability and the organic component ensures ionic conductivity.
2Reliability
If solid electrolyte is used in all-solid-state lithium battery, then safety and stability improve, but ionic conductivity deteriorates due to high grain boundary resistance
Solution Approach 1:
The patent creates a composite electrolyte system where an inorganic electrolyte layer is combined with an organic electrolyte layer. The inorganic layer provides high safety and stability characteristics, while the organic layer compensates for low ionic conductivity by providing continuous ion transport pathways, thereby reducing grain boundary resistance effects.
Solution Approach 2:
The patent applies different material properties to different regions: the inorganic electrolyte layer (e.g., LiNbO3, Li2SiO3) is positioned to provide stability and safety, while the organic electrolyte layer (e.g., PEO-LiClO4) is positioned to provide high ionic conductivity. This local differentiation of material functions optimizes overall performance.
3Reliability
If solid electrolyte is used in all-solid-state lithium battery, then safety improves, but flexibility deteriorates due to brittle characteristics
Solution Approach 1:
The patent combines brittle inorganic electrolyte materials (e.g., LiNbO3, Li2SiO3) with flexible organic electrolyte materials (e.g., PEO-LiClO4) in a composite structure. The organic component imparts flexibility to the overall electrolyte assembly while the inorganic component maintains safety characteristics, creating a composite that exhibits both safety and flexibility.
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 flexible solid electrolyte improves the safety and performance of all-solid-state lithium batteries by providing high electrochemical stability, high ionic conductivity, and flexibility, enabling their use in high-voltage applications without the risks of leakage or fire.
Implementation Method 1
the inorganic component and the organic component collectively form a continuous ion conducting path
Data Source
AI summary
A flexible solid electrolyte includes a first inorganic protective layer, an inorganic-organic composite electrolyte layer including an inorganic component and an organic component, and a second inorganic protective layer, where the inorganic-organic composite electrolyte layer is disposed between the first inorganic protective layer and the second inorganic protective layer, and the inorganic component and the organic component collectively form a continuous ion conducting path.