Grain-Shaped Conductive Polymer Electrode for Low-Temperature Capacitance
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Solution Overview
Problem
Conductive polymer-based electrochemical devices experience performance deterioration, particularly in capacitance, at low temperatures due to decreased anion diffusivity.
Innovation Solution
A grain-shaped conductive polymer with specific X-ray diffraction peaks and a large specific surface area is used as the positive electrode material, facilitating easier anion diffusion and maintaining capacitance retention even at low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conductive polymer is used as positive electrode material, then high output and fast charge-discharge capability are achieved, but performance deteriorates at low temperature due to decreased anion diffusivity
Solution Approach 1:
The invention changes the physical and chemical parameters of the conductive polymer by controlling its morphological structure (grain shape with specific size range of 0.1-10 μm) and crystallinity (specific XRD peak intensities at 2θ=20° and 2θ=25°). These parameter changes optimize the balance between maintaining high power output through fast electron transport and ensuring reliable performance at low temperatures through improved anion diffusivity in the grain-shaped structure.
Solution Approach 2:
The invention creates a composite electrode structure combining conductive polymer grains with specific morphological characteristics and controlled crystallinity. The grain-shaped conductive polymer forms a composite material system where the specific structure (grain morphology with 0.1-10 μm size) and crystalline arrangement (evidenced by XRD peaks) work together to maintain both high power output and low-temperature reliability.
2Power
If conventional conductive polymer structures are used, then high conductivity is achieved, but anion diffusivity decreases at low temperature leading to capacitance loss
Solution Approach 1:
The invention optimizes the structural parameters of the conductive polymer by establishing specific grain size (0.1-10 μm) and crystallinity characteristics (XRD peak intensities at 2θ=20° and 2θ=25°). These parameter changes maintain high electrical conductivity for power output while simultaneously improving anion diffusivity pathways, thereby preserving capacitance retention even at low operating temperatures.
3Power
If the conductive polymer has high crystallinity, then electrical conductivity improves, but anion diffusion becomes restricted at low temperatures
Solution Approach 1:
The invention optimizes the crystallinity parameter of the conductive polymer to achieve a balanced state. The specific XRD peak intensities at 2θ=20° and 2θ=25° indicate a controlled crystalline structure that provides sufficient electrical conductivity while maintaining adequate anion diffusion pathways. This optimized crystallinity parameter resolves the contradiction between electrical conductivity and anion diffusivity.
Solution Approach 2:
The grain-shaped structure with specific size (0.1-10 μm) creates local quality variations within the conductive polymer. The grain boundaries and internal structure provide localized regions with different properties: highly conductive crystalline regions for electron transport and diffusion-friendly intergranular regions for anion transport. This local quality differentiation allows simultaneous optimization of both electrical conductivity and anion diffusivity.
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 use of grain-shaped conductive polymer suppresses performance deterioration at low temperatures, ensuring stable capacitance retention by enhancing anion diffusivity and crystal structure accessibility.
Implementation Method 1
Since the electrochemical device containing the conductive polymer as the positive electrode material is charged and discharged by adsorption (doping) and desorption (dedoping) of anions
Implementation Method 2
an intensity distribution pattern obtained by X-ray diffraction measurement with respect to the conductive polymer has a first peak in which a diffraction angle 2θ ranges from 18° to 21°, inclusive, and a second peak in which a diffraction angle 2θ ranges from 24° to 26°, inclusive
Data Source
AI summary
An electrochemical device electrode includes a conductive polymer as an active material. The conductive polymer has a grain shape, and an intensity distribution pattern obtained by X-ray diffraction measurement with respect to the conductive polymer has a first peak in which a diffraction angle 2θ ranges from 18° to 21°, inclusive, and a second peak in which a diffraction angle 2θ ranges from 24° to 26°, inclusive.