Titanium-Doped Sodium-Ion Cathode Material for Phase-Stable Cycling
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Solution Overview
Problem
Sodium-ion batteries face accelerated degradation due to multi-stage structural changes during charging and discharging, limiting their service life and performance.
Innovation Solution
A method for preparing a titanium-doped sodium-ion battery cathode material using spray pyrolysis, mixing with a sodium source, and sintering, which includes nano-scale titanium dioxide dispersion and a dry process without binders or pH regulators, to enhance structural stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cathode materials are used, then the battery can operate, but the service life is reduced due to accelerated degradation from multi-stage structural changes
Solution Approach 1:
The patent applies parameter changes by precisely controlling the doping amount of titanium dioxide (0.01-0.25 mol ratio relative to Na) and optimizing sintering parameters (temperature, time, atmosphere) to achieve optimal structural stability and service life
Solution Approach 2:
The patent creates a composite cathode material by doping titanium dioxide into the layered oxide structure (NaM1-xTixO2 where M=Ni, Fe, Mn), combining the electrochemical activity of the base material with the structural stability of TiO2 to suppress harmful phase changes
2Stability of the object's composition
If spray pyrolysis with nano-scale titanium dioxide is used, then structural stability is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-synthesizing nano-scale titanium dioxide with controlled particle size (5-50 nm) and surface properties before doping, ensuring optimal dispersion and reaction behavior during the subsequent spray pyrolysis and sintering processes
Solution Approach 2:
The patent uses spray pyrolysis technology which employs pneumatic atomization to disperse the precursor solution into fine droplets, enabling uniform distribution of titanium dioxide nanoparticles throughout the cathode material matrix during coating
3Object-generated harmful factors
If a dry process without binders is used, then environmental impact is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies the taking out principle by completely eliminating organic binders, pH regulators, and other harmful additives from the manufacturing process, using only a water-based precursor solution that evaporates cleanly during spray pyrolysis, leaving no residual contaminants
Solution Approach 2:
The patent achieves the required manufacturing precision through precise control of spray pyrolysis parameters (solution concentration, spray rate, substrate temperature, atmosphere composition) and sintering conditions, ensuring uniform material deposition and composition without requiring binders for 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 method improves the structural stability and service life of sodium-ion batteries by suppressing phase changes, while reducing operational costs and environmental impact through a scalable, nanoscale production process.
Implementation Method 1
Spray pyrolysis is performed on the mixed metal salt solution to obtain a precursor powder A
Implementation Method 2
The mixed solution B is dried to obtain a precursor powder B
Implementation Method 3
The precursor powder B is mixed with a sodium source for sintering, so as to obtain a sodium-ion battery cathode material
Data Source
AI summary
A method for preparing a sodium-ion battery cathode material includes: compounding metal salt solutions to obtain a mixed metal salt solution, where metal sources include one or more of nickel, iron, and manganese; performing spray pyrolysis on the mixed metal salt solution to obtain a first precursor powder; mixing the first precursor powder with an isopropanol solvent to obtain a first mixed solution; dispersing nano-scale titanium dioxide into the first mixed solution to obtain a second mixed solution; drying the second mixed solution to obtain a second precursor powder; and mixing the second precursor powder with a sodium source for sintering to obtain a sodium-ion battery cathode material. A titanium-doped sodium-ion battery cathode material is prepared by adding a heterogeneous element titanium to suppress a phase change at the beginning of the charging, thereby improving the structure stability, output characteristic, and service life of the sodium-ion battery.