Lithium-Supplemented Electrode Sheet via Electrostatic Spinning
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Solution Overview
Problem
Existing lithium-ion battery supplementation methods are complex, prone to electrode sheet wrinkling, and adversely affect battery thickness and energy density, particularly in prismatic and cylindrical batteries.
Innovation Solution
A method involving electrostatic spinning to sequentially form a lithium-supplemented layer and a separator layer on a substrate, followed by thermal lamination, simplifying the process and integrating the layers to improve efficiency and reduce thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium metal foil or powder is attached to the electrode sheet surface through rolling or coating, then lithium supplementation is achieved, but the electrode sheet wrinkles during the attachment process
Solution Approach 1:
The patent replaces the mechanical rolling and coating methods with electrostatic spinning technology. The electrostatic spinning process uses electrostatic forces to deposit lithium-containing polymer solution fibers onto the electrode sheet surface, eliminating the mechanical contact that causes wrinkling while achieving uniform lithium supplementation.
Solution Approach 2:
The patent changes the physical state of lithium supplementation from solid metal foil/powder to a polymer solution containing lithium salts. This parameter change allows the lithium to be deposited in a controlled, uniform manner through electrostatic spinning, preventing the wrinkling issues associated with solid material attachment.
2Quantity of substance
If separate coating of positive electrode slurry and lithium-supplemented slurry is performed, then lithium supplementation is achieved, but the manufacturing process becomes complex
Solution Approach 1:
The patent merges the electrode slurry coating and lithium supplementation into a single integrated process. The electrostatic spinning step simultaneously deposits both the electrode active material slurry and the lithium-containing polymer solution in one operation, eliminating the need for separate coating steps and reducing process complexity.
Solution Approach 2:
The electrostatic spinning apparatus serves multiple functions: it acts as both the electrode coating device and the lithium supplementation device. This multi-functional approach simplifies the manufacturing process by eliminating the need for separate equipment and process steps for each function.
3Quantity of substance
If lithium metal is laminated onto the negative electrode sheet, then lithium supplementation is achieved, but the battery thickness increases
Solution Approach 1:
The patent uses a thin polymer film containing lithium salts deposited through electrostatic spinning instead of thick lithium metal laminates. The electrostatic spinning process creates a uniform, thin-layer coating that provides the necessary lithium supplementation while minimizing thickness increase, unlike traditional lithium metal lamination which adds significant thickness.
4Quantity of substance
If a third electrode is introduced for electrochemical prelithiation, then lithium supplementation is achieved, but the battery weight increases and energy density decreases
Solution Approach 1:
The patent extracts and eliminates the need for the third electrode from the battery system. By using electrostatic spinning to pre-deposit lithium-containing polymer material directly onto the electrode during manufacturing, the supplementation is achieved without requiring an additional lithium metal third electrode inside the battery, thereby reducing battery weight and improving energy density.
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 method allows precise lithium supplementation, avoids wrinkles, reduces battery weight, and enhances energy density by forming a fibrous structure that integrates the electrode sheet, lithium-supplemented layer, and separator layer, thus simplifying the battery preparation process.
Implementation Method 1
Based on an electrostatic spinning method, a lithium-supplemented layer and a separator layer are sequentially formed at a substrate
Implementation Method 2
performing a thermal lamination treatment on the prefabricated electrode sheet to obtain the lithium-supplemented electrode sheet
Data Source
Figure 1
AI summary
A preparation method for a lithium-supplemented electrode sheet, a lithium-supplemented electrode sheet, and a battery. The preparation method comprises: mixing a lithium source and a conductive agent, and adding a first solution to obtain a lithium-supplemented spinning solution; mixing a first high molecular polymer and a first solvent to obtain a second solution; using an electro-static spinning method to coat the surface of a substrate sequentially with the lithium-supplemented spinning solution and the second solution to obtain a prefabricated electrode sheet; and carrying out thermal compounding treatment on the prefabricated electrode sheet to obtain a lithium-supplemented electrode sheet.