Composite Sodium Compensation Material for Low-Potential Na-Ion Cathodes
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Solution Overview
Problem
Existing positive sodium compensation agents in sodium-ion batteries suffer from high oxidation decomposition potential, limiting their effectiveness in reducing sodium loss and improving the performance of sodium-ion batteries.
Innovation Solution
A sodium compensation material comprising a sodium compensation agent NaxCyOzHw and a metal oxide catalyst, where C1 > C0, with a specific particle size and composition, is used to form a composite structure that enhances electron transfer and reduces oxidation decomposition potential, releasing additional sodium ions during the first cycle charge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a positive sodium compensation agent is used to supplement sodium to the positive electrode plate, then the adverse effects caused by sodium loss can be reduced, but the high oxidation decomposition potential limits the actual sodium compensation effect
Solution Approach 1:
The patent applies composite materials by combining the sodium compensation agent with a metal oxide catalyst to form a composite structure. This composite material enables the sodium compensation agent to achieve effective sodium compensation at lower oxidation decomposition potentials, resolving the contradiction between improving sodium compensation effect and reducing oxidation decomposition potential. The metal oxide catalyst component facilitates the reduction of oxidation potential while maintaining or enhancing the sodium compensation capability.
2Reliability
If the oxidation decomposition potential is reduced to enhance sodium compensation effect, then the first cycle sodium compensation effect is improved, but the structural stability of the compensation material may be affected
Solution Approach 1:
The composite structure of sodium compensation agent and metal oxide catalyst provides both low oxidation decomposition potential and structural stability. The metal oxide catalyst acts as a stable framework that maintains structural integrity while enabling the sodium compensation agent to function at lower potentials, thus improving first cycle sodium compensation effect without compromising structural stability.
Solution Approach 2:
The patent applies local quality by creating a composite structure where different components perform different functions: the sodium compensation agent provides the sodium supplementation capability at lower potentials, while the metal oxide catalyst provides structural stability and catalytic activity. This local differentiation of properties allows the material to simultaneously achieve improved sodium compensation effect and maintained structural stability.
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 composite structure improves the first cycle sodium compensation effect, enhancing the energy density and cycle performance of sodium-ion batteries by lowering oxidation decomposition potential and reducing irreversible capacity loss.
Implementation Method 1
a metal oxide catalyst. The sodium compensation material satisfies C1>C0, where C0 represents a content of a metallic element belonging to the metal oxide catalyst measured by performing a first Energy Dispersive Spectroscopy (EDS) test on a pre-selected region of a surface of the sodium compensation material; and C1 represents a content of the metallic element belonging to the metal oxide catalyst measured by performing a second EDS test on the pre-selected region after being melted
Implementation Method 2
calcining the mixture in a gas atmosphere, to obtain the sodium compensation material, where a calcination temperature ranges from 300° C. to 500° C., and where a calcination duration ranges from 1 hour to 6 hours
Implementation Method 3
adding a precursor of a catalyst to the dispersion solution for mixing, and drying, to obtain a mixture
Data Source
AI summary
Provided are a sodium compensation material, a preparation method thereof, a positive electrode plate, and a sodium-ion battery. The sodium compensation material includes: a sodium compensation agent NaxCyOzHw, where 1≤x≤3, 1≤y≤6, 1≤z≤7, and 0≤w≤5; and a metal oxide catalyst. The sodium compensation material satisfies C1>C0, where C0 represents a content of a metallic element belonging to the metal oxide catalyst measured by performing a first Energy Dispersive Spectroscopy (EDS) test on a pre-selected region of a surface of the sodium compensation material, C1 represents a content of the metallic element belonging to the metal oxide catalyst measured by performing a second EDS test on the pre-selected region after being melted.