MeSICON Ceramic Ion Conductivity and Stability
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Solution Overview
Problem
Existing metal ion conducting ceramic materials face challenges in achieving high ion conductivity, selectivity, and stability in water and corrosive media at low temperatures, particularly in alkali and monovalent metal ion applications.
Innovation Solution
Development of MeSICON ceramic materials with a general formulation of Me 1+x+y-z M III y M IV 2-y Si x P 3-x O 12-z/2, where Me is Na, Li, K, Rb, or Ag, and M III and M IV are specific cations, with controlled x, y, and z values to enhance conductivity and stability, allowing for partial substitution of alkali metal ions and oxygen vacancies to maintain stoichiometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional metal ion conducting ceramic materials are used, then basic ion conduction is achieved, but high ion conductivity at low temperatures and high selectivity cannot be simultaneously obtained
Solution Approach 1:
The patent modifies the chemical composition parameters of the ceramic material by controlling the ratios of metal oxides (such as Na2O, ZrO2, SiO2, P2O5) and introducing oxygen vacancies through controlled stoichiometry deviations. This changes the electronic and ionic structure of the material, enabling high ion conductivity at low temperatures without requiring high operating temperatures.
Solution Approach 2:
The patent creates a composite ceramic system combining multiple metal oxides (alkali metal oxides, zirconium oxide, silicon oxide, phosphorus oxide) in specific proportions. This composite structure leverages the complementary properties of each component to achieve both high ion conductivity and low-temperature operation capability.
2Reliability
If ceramic materials are designed for high ion conductivity, then metal ion transport is enhanced, but stability in water and corrosive media deteriorates
Solution Approach 1:
The patent introduces oxygen vacancies at specific stoichiometric positions in the crystal structure, creating localized regions of enhanced ionic conductivity without compromising the overall structural integrity. The controlled deviation from stoichiometry (12-z/2 oxygen atoms) creates conductive pathways while maintaining chemical stability in aqueous and corrosive environments.
3Reliability
If alkali metal ions are substituted to enhance conductivity, then ion transport properties improve, but material stability and stoichiometry are compromised
Solution Approach 1:
The patent systematically varies the compositional parameters (x, y, z in the general formula) to optimize the balance between ion conductivity and structural stability. By controlling the substitution levels of alkali metal ions and adjusting oxygen content, the material achieves enhanced conductivity while maintaining thermodynamic stability and 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 MeSICON materials exhibit high ion conductivity, selectivity, and improved chemical stability in corrosive media, maintaining performance in aqueous solutions and electrochemical conditions, with conductivity greater than 1 mS/cm at room temperature and resistance to corrosion in high NaOH concentrations.
Implementation Method 1
metal ion conducting ceramic material having characteristics of high ion conductivity for certain alkali and monovalent metal ions at low temperatures
Data Source
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AI summary
Metal ion conducting ceramic materials are disclosed having characteristics of high ion conductivity for certain alkali and monovalent metal ions at low temperatures, high selectivity for the metal ions, good current efficiency and stability in water and corrosive media under static and electrochemical conditions. The metal ion conducting ceramic materials are fabricated to be deficient in the metal ion. One general formulation of the metal ion conducting ceramic materials is Me1+x+y-zMIIIyMIV2-ySixP3-xO12-z/2, wherein Me is Na+, Li+, K+, Rb+, Cs+, Ag+, or mixtures thereof, 2.0 ≤ x ≤ 2.4, 0.0 ≤ y ≤ 1.0, and 0.05 ≤ z ≤ 0.9, where MIII is Al3+, Ga3+, Cr3+, Sc3+, Fe3+, In3+, Yb3+, Y3+, or mixtures thereof and MIV is Ti4+, Zr4+, Hf4+, or mixtures thereof. Preferably Na+, Y3+ and Zr4+ are used.