NASICON Solid Electrolyte Composition for Stable Sodium-Ion Cathodes
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Solution Overview
Problem
Existing solid electrolyte materials for sodium-ion batteries suffer from low ionic conductivity and poor structural stability, limiting their practical application.
Innovation Solution
A solid electrolyte material with a specific crystal plane intensity and area ratio, optimized through a multi-step preparation method involving mixing, polymerization, pre-sintering, and sintering treatments, to enhance ionic conductivity and structural stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional solid-phase reaction methods are used to prepare NASICON solid electrolyte, then the manufacturing process is simple, but the mixing of raw materials is uneven causing formation of impurities and low ionic conductivity
Solution Approach 1:
The patent applies preliminary action by performing ball milling of raw materials before the solid-phase reaction. This pre-mixing step ensures uniform distribution of Na2CO3, ZrO2, SiO2, and P2O5 particles, preventing impurity formation during sintering and enabling high ionic conductivity without complicating the overall process
Solution Approach 2:
The patent changes the particle size parameter of raw materials through ball milling to achieve uniform mixing. By controlling the milling time and intensity, the raw materials are reduced to fine particles with consistent size distribution, which improves reaction uniformity and eliminates impurities while maintaining process simplicity
2Reliability
If wet chemical reaction methods (hydrothermal method and sol-gel method) are used to improve ionic conductivity, then the performance is improved, but large-scale production at low cost cannot be achieved
Solution Approach 1:
The patent extracts the essential benefit of wet chemical methods (uniform mixing and high conductivity) while eliminating their drawbacks (complexity and cost). By using ball milling to achieve uniform particle distribution followed by simple solid-phase sintering, the method captures the performance advantages without requiring hydrothermal autoclaves or sol-gel chemistry, enabling scalable production
Solution Approach 2:
The patent replaces expensive and complex wet chemical processing equipment with simple, inexpensive ball milling and sintering equipment. This substitution maintains high ionic conductivity while dramatically reducing manufacturing costs and enabling large-scale production through conventional ceramic processing techniques
3Area of stationary object
If nanonized NASICON solid electrolyte is used, then the surface area is increased, but structural instability and phase separation occur making long-term preservation difficult
Solution Approach 1:
The patent applies preliminary action by performing extended ball milling before sintering, which creates a uniform precursor mixture with intimate contact between particles. This pre-mixing ensures that during subsequent sintering, the nanoscale particles react uniformly to form a stable, homogeneous NASICON phase without phase separation, preserving structural stability while maintaining high surface area
Solution Approach 2:
The patent achieves local quality by ensuring uniform distribution of dopant elements (Al, Ga, In, Ge, Sc) at the nanoscale within the NASICON lattice. This homogeneous local composition prevents phase separation and maintains structural stability throughout the material, allowing long-term preservation of the nanosized electrolyte particles
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 optimized solid electrolyte material exhibits improved ionic conductivity exceeding 8×10−5 S/cm and enhanced structural stability, facilitating better performance and safety in sodium-ion batteries.
Implementation Method 1
The solid electrolyte includes organic polymers, sulfides, halides, perovskite type, NASICON type, garnet type, and other types. The NASICON solid electrolyte has the advantages such as high conductivity
Implementation Method 2
sequentially performing a pre-sintering treatment and a sintering treatment on the precursor I of the solid electrolyte, to obtain a precursor II of the solid electrolyte
Data Source
AI summary
The present application relates to the field of sodium-ion batteries and discloses a solid electrolyte material, a solid electrolyte, a cathode material and a preparation method thereof, and a sodium-ion battery. A ratio of a peak intensity I(020) of a (020) crystal plane to a peak intensity I(421) of a (421) crystal plane obtained by X-ray Diffraction (XRD) of the solid electrolyte material satisfies 0.9≤I(020)/I(421)<1. A ratio of a peak area A(020) of the (020) crystal plane to a peak area A(421) of the (421) crystal plane obtained by XRD of the solid electrolyte material satisfies 0.45≤A(020)/A(421)<1. The solid electrolyte material has good crystallinity, high ionic conductivity, and good structural stability. The cathode material made from the solid electrolyte material has high capacity and excellent rate, cycle, and thermal stability.