Surface-Exposed Sodium Supplement Material for Stable Na-Ion Cathodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In composite sodium supplement materials, the separation of sodium supplement agent, conductive agent, and catalyst particles during mixing hinders effective conductive and catalytic effects, limiting the practical sodium supplementation efficacy and energy density of sodium-ion batteries.
Innovation Solution
A sodium supplement material is designed with a sodium supplement agent body and first particles (conductive and catalyst particles) partially encapsulated and exposed on its surface, controlled within specific ranges to enhance electron transport and catalytic activity, achieved through a calcination process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sodium supplement agent, conductive agent, and catalyst particles are mixed separately, then manufacturing process is simple, but particle separation occurs during mixing which hinders conductive and catalytic effects
Solution Approach 1:
The patent combines multiple particles (sodium supplement agent, conductive agent, and catalyst) into a single composite particle structure. The conductive agent and catalyst particles are embedded within or coated on the sodium supplement agent particle, forming an integrated composite particle that prevents separation during mixing while maintaining all functional effects.
Solution Approach 2:
The patent creates a composite particle material where different functional components (sodium supplement agent, conductive agent, catalyst) are combined into a single composite structure. This composite particle exhibits synergistic effects while preventing the separation issues that occur with simple physical mixing of separate particles.
2Stability of the object's composition
If conductive agent and catalyst particles are fully encapsulated by sodium supplement agent body, then particle stability is improved, but exposed particles are reduced which limits conductive and catalytic activity
Solution Approach 1:
The patent applies different degrees of encapsulation to different regions or particles. Some conductive agent and catalyst particles are fully encapsulated within the sodium supplement agent body for stability, while other particles are partially exposed on the surface to maintain conductive and catalytic activity. This creates a system with spatially varying properties.
Solution Approach 2:
Instead of fully encapsulating all conductive and catalyst particles (which would maximize stability but reduce activity), the patent uses partial encapsulation. This partial action allows the system to achieve sufficient structural stability while maintaining adequate conductive and catalytic functionality through the exposed particle portions.
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 material exhibits lower oxidative decomposition potential, improving first-cycle sodium supplementation performance and energy density of sodium-ion batteries, with enhanced cycling performance and reduced production costs.
Implementation Method 1
during calcination, the sodium supplement agent raw material melts, and the conductive agent particles and catalyst particles disperse into the molten sodium supplement agent raw material
Implementation Method 2
During cooling, the sodium supplement agent raw material solidifies and precipitates using the conductive agent particles as a skeleton to form the sodium supplement agent body
Data Source
AI summary
A sodium supplement material, a preparation method thereof, positive electrode plate, and sodium-ion battery. The sodium supplement material includes a sodium supplement agent body and first particles exposed on the surface of the sodium supplement agent body. In any 300 nm×200 nm region on the surface of the sodium supplement material, the number of first particles ranges from 2 to 20. The first particles include one or more conductive agent particles and one or more catalyst particles.