Pre-doping Electrode Material via Static Pressurization
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Solution Overview
Problem
Conventional methods for pre-doping electrode materials in lithium and sodium ion cells and capacitors are costly, energy-intensive, and pose safety concerns due to high-speed stirring and potential for impurity introduction during the doping process.
Innovation Solution
A method involving static pressurization of an amorphous aggregation containing an active material in the presence of an alkali metal supply and a solvent, which allows for efficient and uniform doping without violent collisions, reducing manufacturing costs and ensuring safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed stirring and blending methods are used for pre-doping, then doping efficiency is improved, but manufacturing cost increases and safety concerns arise
Solution Approach 1:
The patent replaces high-speed mechanical stirring and blending with a chemical reaction mechanism. Alkali metal particles react with the active material through electrochemical reactions in the electrolyte solution, achieving doping without mechanical agitation. This substitution eliminates the need for high-speed equipment while maintaining doping efficiency.
Solution Approach 2:
The patent changes the doping mechanism from mechanical (high-speed stirring) to chemical/electrochemical (alkali metal particle reaction). By controlling parameters such as alkali metal particle size, electrolyte composition, and reaction time, the patent achieves uniform doping without the need for energy-intensive mechanical mixing.
2Productivity
If high-speed stirring and blending methods are used for pre-doping, then doping efficiency is improved, but safety concerns arise
Solution Approach 1:
The patent replaces high-speed mechanical stirring with electrochemical reactions. Alkali metal particles naturally react with the active material through ion exchange in the electrolyte, eliminating mechanical stresses and potential contamination from stirring equipment. This improves safety by removing sources of mechanical failure and impurity introduction.
3Stability of the object's composition
If conventional pre-doping methods with insulating binders are used, then electrode structure is maintained, but non-uniform doping causes speckles at SEI coating
Solution Approach 1:
The patent extracts the insulating binder from the doping process. By performing pre-doping on loose active material particles before electrode assembly, the patent eliminates the barrier effect of binders that prevent uniform doping. The active material particles are doped individually, ensuring uniform alkali metal distribution throughout the material.
Solution Approach 2:
The patent performs pre-doping as a preliminary step before electrode assembly and binder addition. By doping the active material particles first while they are still loose and accessible, the patent ensures uniform doping throughout the material. The binder is then added later during electrode fabrication, so it does not interfere with the doping process.
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
This approach enables the production of high-quality, pre-doped electrode materials at lower costs with improved safety, facilitating the manufacture of high-performance cells and capacitors by ensuring rapid and uniform doping of alkali metals into the active materials.
Implementation Method 1
a method involving in-cell pre-doping with the active material of the negative electrode by using a charge collector having a through-hole
Implementation Method 2
a pressurization step in which, in the presence of an alkali metal supply and a solvent, an amorphous aggregation containing at least an active material is in a statically pressurized state
Data Source
AI summary
Provided is a method for manufacturing an electrode material having a pressing step in which an irregularly shaped aggregate containing at least an active material is statically pressed in the presence of an alkali metal source and a solvent.