Binary-Substituted Vanadium Phosphate Cathode for Fast-Charging Stability
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Solution Overview
Problem
Existing sodium-ion battery technologies face challenges due to the large size of sodium ions, which affect the performance and cost of cathode materials, particularly those containing high vanadium content, leading to limited conductivity and cycle stability, and high production costs.
Innovation Solution
A binary substituted vanadium phosphate electrode material represented by the formula A (3+x) V (2-x) B x (PO 4 ) (3-(y/3)) C y, where A is Li, Na, or K, B is a transition or alkaline earth metal, and C is F, Cl, Br, or I, with specific doping and coating to enhance electrochemical properties, produced through a sol-gel method involving freeze drying and calcination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high vanadium content is used in sodium vanadium phosphate cathode material, then specific capacity and stability are improved, but conductivity and high-rate long-cycle performance are limited
Solution Approach 1:
The patent applies parameter changes by substituting vanadium with other metal elements (such as iron, manganese, zinc) at controlled ratios to modify the cathode material's properties. This substitution changes the electronic structure and conductivity of the material, achieving a balance between stability and conductivity without completely replacing vanadium, thus maintaining capacity while improving rate performance.
Solution Approach 2:
The patent creates composite cathode materials by combining vanadium phosphate with other metal phosphates or oxides. These composite structures leverage the high stability of vanadium phosphate while incorporating elements with better conductivity, achieving synergistic effects that improve both reliability and power output simultaneously.
2Ease of manufacture
If sodium-ion battery is used instead of lithium-ion battery, then production cost is reduced, but output power and energy density are lowered
Solution Approach 1:
The patent modifies the cathode material composition parameters by incorporating multiple metal elements in optimized ratios, which enhances the material's intrinsic conductivity and reaction kinetics. This allows sodium-ion batteries to achieve better output power without sacrificing the cost advantage of using sodium instead of lithium.
3Ease of manufacture
If conventional chemical synthesis method is used for vanadium sodium phosphate, then material is produced, but electrochemical properties especially conductivity are limited
Solution Approach 1:
The patent changes the synthesis parameters by controlling substitution ratios, calcination temperatures, and processing conditions to optimize the material's crystal structure and morphology. These parameter adjustments enhance conductivity while maintaining the simplicity of chemical synthesis methods.
Solution Approach 2:
The patent produces composite materials through chemical synthesis that combine multiple metal phosphates, creating structures with improved conductivity pathways while maintaining the ease of conventional synthesis approaches.
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 electrode material exhibits improved conductivity, charge-discharge capacity, and cycle stability, facilitating fast charging and discharging with enhanced cyclability, while reducing vanadium content and production costs.
Implementation Method 1
produced through a sol-gel method involving freeze drying and calcination
Implementation Method 2
involving freeze drying and calcination
Implementation Method 3
involving freeze drying and calcination
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3(a)~3(b)
AI summary
The present invention relates to an electrode material. More particularly, the present invention relates to a binary substituted vanadium phosphate electrode active material and a battery comprising the same.