Proton-conducting solid electrolyte, electrolyte layer, and battery
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Solution Overview
Problem
Existing ion conductors, such as YSZ and barium zirconate, require high temperatures for optimal performance, necessitating additional heating and cooling systems, and there is a need for materials with higher proton conductivity in lower and medium-temperature ranges that are stable across varying environmental conditions.
Innovation Solution
Development of proton-conducting solid electrolytes represented by specific general formulas, incorporating elements like Sc, Mo, Ge, Nb, Ta, V, W, or Sb, with precise ranges for α, x, y, and δ, to achieve high proton conductivity in a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If YSZ or barium zirconate is used as ion conductor, then oxide ion conductivity is achieved, but high temperature operation (700°C or higher) is required
Solution Approach 1:
The invention changes the chemical composition parameters by introducing specific dopants (gadolinium, calcium, aluminum) into the barium zirconate structure, and adjusts the stoichiometric ratios (x, y, z parameters) to optimize proton conductivity. This allows the material to achieve high ion conductivity at lower temperatures by modifying its electronic and structural properties rather than relying on thermal activation alone
Solution Approach 2:
The invention creates a composite doping strategy combining multiple elements (barium, zirconate, gadolinium, calcium, aluminum) in specific ratios. This multi-element composite approach synergistically enhances both proton conductivity and chemical stability, allowing operation at lower temperatures while maintaining reliability
2Reliability
If high temperature operation is implemented, then ion conductivity is secured, but additional heating and cooling systems are required
Solution Approach 1:
By changing the material composition parameters (dopant types and concentrations), the invention enables the solid electrolyte to achieve optimal ion conductivity at lower temperatures (200-700°C), thereby eliminating or reducing the need for complex high-temperature heating and cooling infrastructure
Solution Approach 2:
The invention replaces the mechanical/thermal system (heating and cooling devices) with a materials science solution (optimized solid electrolyte composition). Instead of using external thermal management systems to achieve conductivity, the material itself is engineered to provide high ion conductivity at lower temperatures through compositional optimization
3Stability of the object's composition
If conventional solid electrolytes are used, then stability at high temperature is achieved, but proton conductivity in low-temperature range is insufficient
Solution Approach 1:
The invention optimizes the compositional parameters (x, y, z ratios of barium, zirconate, dopants) to create a material phase that maintains structural stability while enhancing proton conduction pathways. The specific doping levels and stoichiometric balances enable the material to exhibit both stability and high proton conductivity across a wide temperature range
Solution Approach 2:
The invention introduces localized doping regions with specific elements (gadolinium, calcium, aluminum) at controlled concentrations within the barium zirconate lattice. This creates local structural modifications that favor proton conduction while maintaining overall compositional stability, achieving high proton conductivity without sacrificing structural integrity
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 new solid electrolytes exhibit excellent proton conductivity from 100°C to 700°C, reducing the need for high-temperature operation and enhancing stability across varying conditions.
Implementation Method 1
a proton-conducting solid electrolyte which exhibits high proton conductivity in a low-temperature range and a medium-temperature range
Data Source
AI summary
What is provided are a proton-conducting solid electrolyte which can exhibit high proton conductivity and stability in a low-temperature range and a medium-temperature range, an electrolyte layer formed of the proton-conducting solid electrolyte, and a battery. As an example, a proton-conducting solid electrolyte represented by a general formula: Ba1-αSc1-xMoxO3-δHy, in which α is −0.2 to 0.2, x is 0.1 to 0.3, y is 0 to 1-3x, and δ is 0 to ½-3x/2, a proton-conducting solid electrolyte represented by a general formula: BaSc1-xMoxO3-δHy, in which x is 0.15 to 0.25, y is 0 to 1-3x, and δ is 0 to ½-3x/2, or the like; an electrolyte layer, and a battery are provided.