Solid-State Ion Capacitor Particle Distribution
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Solution Overview
Problem
Solid-state ion capacitors with inorganic solid electrolytes face challenges in achieving high dielectric relaxation frequency, which limits their use as coupling or decoupling devices due to higher internal resistance and lower capacitance compared to ceramic or electrolytic capacitors.
Innovation Solution
The solid-state ion capacitor design features a solid electrolyte with a controlled particle distribution, where the average particle number in the thickness direction is 80 or less and particle sizes between 0.5 μm and 100 μm, utilizing lithium ion conductive compounds with a Garnet-type crystal structure, and a laminated structure to enhance ionic conductivity and dielectric relaxation frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the solid electrolyte uses inorganic compound to avoid liquid leaking, then reliability is improved, but internal resistance increases and dielectric relaxation frequency decreases
Solution Approach 1:
The patent changes the particle size parameters of the solid electrolyte, specifically controlling D10 to be 0.5 μm or more and D90 to be 100 μm or less. This parameter optimization reduces grain boundary resistance and increases ionic conductivity, thereby improving dielectric relaxation frequency while maintaining the reliability benefits of inorganic solid electrolytes
Solution Approach 2:
The patent uses composite material structure by combining solid electrolyte particles with specific size distribution (D10 ≥ 0.5 μm, D90 ≤ 100 μm) to create an optimized microstructure. This composite approach balances the liquid-leak-proof reliability of inorganic materials with improved ionic conductivity through controlled particle morphology and size distribution
2Quantity of substance
If the capacitance is increased for electricity storage, then energy storage capacity is improved, but internal resistance increases and dielectric relaxation frequency decreases
Solution Approach 1:
The patent optimizes the particle size parameters (D10 ≥ 0.5 μm, D90 ≤ 100 μm) to reduce grain boundary resistance. This allows the device to achieve high capacitance for electricity storage while maintaining low internal resistance and high dielectric relaxation frequency, resolving the trade-off between storage capacity and power response
3Manufacturing precision
If the particle size D10 is less than 0.5 μm, then manufacturing precision is improved, but resistance component increases and ionic conductivity decreases
Solution Approach 1:
The patent establishes a lower bound parameter (D10 ≥ 0.5 μm) that prevents excessive fineness. This parameter constraint avoids the grain boundary resistance dominance that occurs with ultra-fine particles, maintaining high ionic conductivity while still providing sufficient manufacturing precision for consistent device performance
4Manufacturing precision
If the particle size D90 is greater than 100 μm, then manufacturing precision is reduced, but intragranular resistance decreases, however overall ionic conductivity still decreases
Solution Approach 1:
The patent establishes an upper bound parameter (D90 ≤ 100 μm) that prevents excessive coarseness. This constraint ensures that particles remain small enough to maintain low grain boundary resistance and high ionic conductivity, while still allowing sufficient manufacturing tolerance. The balanced parameter range optimizes the trade-off between manufacturability and electrical performance
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
This configuration increases the dielectric relaxation frequency, enabling faster charging and discharging rates, making the solid-state ion capacitor suitable for applications requiring quick energy storage and release, such as regenerative braking and peak power generation, while maintaining uniform properties and reducing internal resistance.
Implementation Method 1
the resistance component in the grain boundaries can be suppressed, thereby the ionic conductivity and the dielectric relaxation frequency can be increased
Implementation Method 2
If the average particle number is more than 80, the resistance component in the grain boundaries will increase, resulting in a decrease in the ionic conductivity
Data Source
AI summary
The present invention provides a solid-state ion capacitor. In the solid-state ion capacitor, the particle number in the thickness direction of the solid electrolyte sandwiched between the electrodes was at least 1 and the average particle number was 80 or less. Further, the solid electrolyte includes particles with D10˜D90 in the particle diameters of particle size distribution of 0.5 μm or more and 100 μm or less.