Nitrogen-Doped Niobium Suboxide for Capacitor Reliability
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Solution Overview
Problem
Current niobium suboxide powders used in solid electrolyte capacitors have limitations in service life, operating temperature, breakdown voltage, and burning rate, which restrict their application in mobile devices and the automotive industry.
Innovation Solution
A niobium suboxide powder with a bulk nitrogen content of 500 to 20,000 ppm, preferably 2,000 to 8,000 ppm, is developed, where nitrogen is quasi-homogeneously distributed as Nb2N crystals, enhancing sintering and reducing leakage current, with a specific grain size distribution and porosity that improves capacitor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional niobium suboxide powder is used, then capacitor manufacturing is straightforward, but service life decreases at higher operating voltages
Solution Approach 1:
The patent applies parameter changes by doping niobium suboxide powder with nitrogen to alter its chemical composition and physical properties. The nitrogen content is controlled within specific ranges (500-20,000 ppm bulk concentration) to modify the material's electrical and thermal characteristics, enabling capacitors to maintain reliability at higher operating voltages while extending service life
Solution Approach 2:
The patent creates a composite material system by incorporating nitrogen-doped niobium suboxide particles into the capacitor anode structure. This composite approach combines the high dielectric constant of Nb2O5 with the electrical conductivity of suboxide phases and the stabilizing effect of nitrogen doping, achieving improved service life at elevated voltages through synergistic material properties
2Temperature
If conventional niobium suboxide powder is used, then current capacitor performance is achieved, but operating temperature is limited to about 125°C
Solution Approach 1:
The patent uses parameter changes by controlling nitrogen doping levels to modify the thermal stability and electrical properties of niobium suboxide. The nitrogen atoms substitute into the oxide lattice, creating defect structures that enhance thermal resistance and maintain charge carrier mobility at elevated temperatures, thereby enabling operation above 125°C while preserving capacitor performance
Solution Approach 2:
The patent applies local quality by creating regions with different nitrogen concentrations and oxide phase compositions within the anode structure. The nitrogen doping is distributed to optimize local electrical conductivity and thermal stability, allowing different regions of the capacitor to handle thermal stress differently and maintain overall performance at higher operating temperatures
3Object-affected harmful factors
If conventional niobium suboxide powder is used, then standard capacitor properties are achieved, but breakdown voltage is limited and burning rate is high
Solution Approach 1:
The patent converts the potentially harmful high reactivity and burning rate of conventional niobium suboxide into a benefit through controlled nitrogen doping. The nitrogen atoms modify the combustion kinetics by creating nitrogen-rich zones that burn more slowly and generate less heat, while simultaneously enhancing the electrical breakdown resistance through improved lattice stability and charge trapping mechanisms
Solution Approach 2:
The patent applies parameter changes by adjusting the nitrogen content to optimize the trade-off between breakdown voltage and burning characteristics. The nitrogen doping modifies the material's thermal conductivity, electrical resistivity, and chemical reactivity, achieving higher breakdown voltage thresholds and reduced burning rates through controlled compositional changes
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 nitrogen-doped niobium suboxide powder increases the service life and operating temperature of capacitors, enhances breakdown voltage, and reduces burning rate and heat generation, making them suitable for broader industrial applications.
Implementation Method 1
nitrogen is quasi-homogeneously distributed as Nb2N crystals, enhancing sintering
Data Source
AI summary
A niobium suboxide powder comprising niobium suboxide particles having a bulk nitrogen content of between 500 to 20,000 ppm. The nitrogen is distributed in the bulk of the powder particles. The nitrogen at least partly is present in the form of at least one of Nb2N crystals or niobium oxynitride crystals.