Ternary-Substituted Vanadium Phosphate Cathode With Lower Vanadium Cost
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current sodium-ion battery technologies face challenges due to the high cost and limited electrochemical properties of vanadium-rich electrode materials, which hinder commercialization and require improved charge/discharge cycle characteristics and reduced vanadium content while maintaining performance.
Innovation Solution
A ternary substituted sodium vanadium phosphate electrode active material is developed with a general formula A1-xBxV2-yCz(PO4)3-d, where A and B are selected from Li and K, C is a transition or post-transition metal, and D is a halogen, with specific ranges for x, y, and z, and optionally coated with conductive materials, using a sol-gel method involving precursors and calcination to enhance conductivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vanadium-rich electrode material is used, then electrochemical performance is improved, but cost increases and commercialization is hindered
Solution Approach 1:
The patent applies parameter changes by systematically varying the substitution levels (x, y, z parameters) of Li/K, transition metals, and halogens in the electrode material formula A1-xBxV2-yCz(PO4)3-d. This optimization of compositional parameters achieves improved electrochemical performance while controlling vanadium content to reduce cost.
Solution Approach 2:
The patent creates composite materials through ternary substitution, combining multiple elements (Li/K, transition metals like Fe/Mn/Co, and halogens) within the vanadium phosphate structure. This composite approach enhances performance while allowing reduction of expensive vanadium content.
2Ease of manufacture
If vanadium content is reduced, then cost decreases, but charge/discharge cycle characteristics deteriorate
Solution Approach 1:
The patent applies local quality by strategically placing different substituting elements at specific sites within the crystal structure. The ternary substitution (A, C, D elements) creates localized modifications that enhance structural stability and charge/discharge characteristics while reducing overall vanadium content.
Solution Approach 2:
The patent optimizes the substitution parameters (x, y, z) to find the optimal balance between vanadium content reduction and maintaining charge/discharge cycle characteristics. Through systematic parameter variation, the patent achieves improved cyclability with reduced vanadium.
3Ease of manufacture
If chemical synthesis method is used, then electrode material is produced, but conductivity and high-rate long-cycle performance are limited
Solution Approach 1:
The patent applies parameter changes by optimizing synthesis conditions including sol-gel process parameters, calcination temperature, and substitution ratios. These parameter optimizations enhance electrical conductivity and high-rate performance while maintaining the chemical synthesis approach.
Solution Approach 2:
The patent creates composite electrode materials with enhanced conductivity through the incorporation of conductive additives and the design of composite structures that combine vanadium phosphate with other materials having complementary properties, thereby improving high-rate and long-cycle performance.
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 ternary substituted sodium vanadium phosphate electrode material exhibits improved electrochemical performance, including rate capability and cyclability, with fast charging-discharging and good cyclability, while reducing vanadium content and facilitating scalable commercial production.
Implementation Method 1
The sol-gel method involving precursors and calcination
Implementation Method 2
The sol-gel method involving precursors and calcination
Implementation Method 3
calcination to enhance conductivity and stability
Data Source
AI summary
The present invention relates to an electrode material. More particularly, the present invention relates to a ternary substituted vanadium phosphate electrode active material and a battery comprising the same.