Solid Ion Capacitor Thin Film Electrolyte Design
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Solution Overview
Problem
Conventional solid ion capacitors with thick solid electrolytes face challenges in increasing electrostatic capacitance and maintaining good cycle characteristics due to limited electric field penetration and potential chemical reactions at interfaces during charging and discharging.
Innovation Solution
A solid ion capacitor design featuring thin film solid electrolytes with electrodes containing a predetermined amount of ion conductive elements, such as Li, to enhance electric field penetration and prevent chemical reactions, thereby increasing electrostatic capacitance and ensuring good cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a thick solid electrolyte is used, then the device structure is simpler and easier to manufacture, but the electric field penetration is limited and electrostatic capacitance cannot be increased
Solution Approach 1:
The patent applies this principle by transitioning from a thick solid electrolyte to a thin film solid electrolyte structure. The thin film electrolyte enables extensive electric field penetration throughout the entire electrolyte volume, which dramatically increases the electrostatic capacitance while maintaining structural simplicity and ease of manufacture through standard thin film fabrication techniques.
2Quantity of substance
If a thin film solid electrolyte is used, then the electrostatic capacitance increases due to extensive electric field penetration, but unintended chemical reactions may occur at interfaces during charging and discharging
Solution Approach 1:
The patent applies this principle by introducing an ion conductive element into the electrode material to serve as an intermediary substance. This element migrates to the electrode-electrolyte interface during charging and discharging cycles, where it suppresses unintended chemical reactions between the electrode and electrolyte, thereby improving cycle characteristics while maintaining the thin film structure's high electrostatic capacitance.
3Device complexity
If electrodes without ion conductive elements are used, then the device structure is simpler, but chemical reactions occur at interfaces during charging and discharging
Solution Approach 1:
The patent applies this principle by creating a composite electrode material that combines conventional electrode materials with ion conductive elements. This composite structure provides both the electrical conductivity needed for capacitor operation and the chemical stability at interfaces, improving cycle characteristics without significantly increasing device complexity since the ion conductive elements are incorporated during the electrode fabrication process.
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 design achieves a significant increase in electrostatic capacitance and maintains stable performance even after repeated charging and discharging cycles by allowing extensive electric field penetration and suppressing unintended chemical reactions.
Implementation Method 1
a solid electrolyte which mainly contains a Li ion conductive compound
Implementation Method 2
an increase in the electric field applied region is expected
Data Source
AI summary
A positive electrode and a negative electrode are formed on both main surfaces of a solid electrolyte. Preferably, the solid electrolyte is a thin film body with a thickness of less than or equal to 200 μm, and contains an ion conductive compound such as Li ions. The positive electrode and the negative electrode contain an ion conductive substance, for example Li2O, which contains an ion conductive element such as Li, in a range of less than 50 vol % (not including 0 vol %), preferably 1 to 35 vol %.