Sodium Super Ionic Conductor Electrolyte Low-Dimensional Crystallization
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Solution Overview
Problem
The preparation of sodium super ionic conductor solid electrolytes by high-temperature methods results in impurity phases, uneven particle size distribution, and reduced ion conductivity due to the volatility of sodium and phosphorus, leading to safety and performance issues in sodium-ion batteries.
Innovation Solution
A method involving low-dimensional crystallization using plasma-assisted spray drying and sintering, where plasma active groups modify the surface of precursor particles, reducing the free space dimension of crystal growth and improving dispersion stability, resulting in high crystal purity, compactness, and uniform particles with enhanced ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-temperature solid-phase method is used to prepare sodium super ionic conductor solid electrolyte, then the crystallization process can be completed, but sodium and phosphorus become highly volatile, causing impurity phase precipitation and component content control difficulties
Solution Approach 1:
The patent changes the sintering temperature parameter from traditional high temperature (above 900°C) to low temperature (700-900°C), which fundamentally reduces the volatility of sodium and phosphorus elements, thereby preventing impurity phase precipitation and improving component content control precision
Solution Approach 2:
The patent performs preliminary action by pre-forming precursor particles with specific composition and structure before sintering, and using plasma treatment to modify particle surfaces in advance, which facilitates low-temperature crystallization and prevents element loss during the sintering process
2Manufacturing precision
If high-temperature sintering is used, then the solid electrolyte can be formed, but the particle size distribution becomes uneven and crystal purity decreases
Solution Approach 1:
The patent segments the sintering process into controlled stages and treats particles individually through plasma modification, preventing agglomeration and ensuring uniform particle size distribution while maintaining crystal purity through low-temperature processing
Solution Approach 2:
The patent replaces traditional mechanical high-temperature sintering with a combination of plasma treatment and low-temperature sintering, where plasma active groups modify particle surfaces to promote uniform crystallization without requiring high temperatures that cause particle aggregation and impurity formation
3Reliability
If traditional high-temperature solid-phase method is used, then the solid electrolyte can be prepared, but the ion conductivity is reduced due to impurity phases and uneven particle distribution
Solution Approach 1:
The patent changes the temperature parameter to low-temperature sintering (700-900°C), which prevents impurity phase formation and maintains component stoichiometry, thereby ensuring high crystal purity and uniform particle distribution that are essential for high ion conductivity
Solution Approach 2:
The patent substitutes plasma treatment for traditional high-temperature mechanical sintering, where plasma active groups enhance particle surface reactivity and promote uniform low-temperature crystallization, resulting in pure crystals with consistent particle sizes and superior ion conductivity
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 method achieves high crystal purity, compactness, and uniform particles with improved ion conductivity, reducing battery polarization and prolonging cycle life, while simplifying the process and reducing energy consumption and equipment investment.
Implementation Method 1
low-temperature plasma is used as the protective gas of the spray drying equipment, and the powder material is modified and granulated while evaporating the solvent of the precursor slurry. Plasma active groups modify the surface of sodium super ionic conductor solid electrolyte precursor particles in-situ
Implementation Method 2
the powder material is modified and granulated while evaporating the solvent of the precursor slurry
Implementation Method 3
Compared with the traditional high-temperature solid-state sintering process, it has the advantages of low sintering temperature, fast crystallization speed, high crystal purity and integrity, good compactness, and uniform particles
Implementation Method 4
The directional crystal growth is induced by the anion coordination polyhedron, which reduces the free space dimension of the crystal growth during the crystallization process
Data Source
AI summary
A method for preparing a sodium super ionic conductor solid electrolyte by low-dimensional crystallization belongs to a field of energy materials. The method is based on the theory of negative ion coordination polyhedron growth unit, and uses low-temperature plasma as a protective gas of a spray drying equipment. While evaporating the solvent in a sodium super ionic conductor solid electrolyte precursor slurry, plasma active groups modify the particle surface of the sodium super ionic conductor solid electrolyte precursor particles in-situ. A free space dimension of crystal growth in the crystallization process is reduced, and directional growth of crystals in the solid phase sintering process is induced. Secondly, the dispersion stability of the sodium super ionic conductor solid electrolyte precursor particles is improved. Compared with the traditional high-temperature solid-state sintering process, the method has the advantages of fast crystallization speed, high crystal purity and integrity, good compactness, and uniform particles.