Composite Solid Electrolyte Membrane for Wrinkle-Free Li-Ion Stacking
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Solution Overview
Problem
The existing preparation process of lithium-ion batteries is complex and prone to errors, such as wrinkles in the separator leading to lithium dendrite formation and safety issues, due to the lack of surface bonding between electrode sheets and the need for precise alignment, which complicates the stacking and packaging process.
Innovation Solution
A method involving the use of composite solid electrolyte membranes laminated onto electrode sheets through a hot pressing process, allowing for better bonding and alignment without precise surface alignment, using a battery forming device for pressing, trimming, and shaping to create a stable lithium-ion battery structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If stacking equipment is used to stack electrode sheets and separator alternately without surface bonding, then the stacking process is simple, but wrinkles form in the separator causing lithium dendrite formation and safety issues
Solution Approach 1:
The patent applies preliminary action by performing surface bonding treatment on the electrode sheets before the stacking process. The solid electrolyte is coated on the electrode sheet surfaces in advance, creating a bonded surface that prevents wrinkles during stacking. This preliminary preparation ensures that when stacking occurs, the surfaces are already prepared to maintain contact and prevent defect formation.
Solution Approach 2:
The solid electrolyte serves as an intermediary substance between electrode sheets during stacking. By coating the solid electrolyte on electrode sheet surfaces beforehand, it acts as a bonding medium that facilitates proper contact and alignment during stacking, preventing separator wrinkles while maintaining the simplicity of the stacking process.
2Manufacturing precision
If precise alignment is required during stacking of electrode sheets and separator, then bonding quality is improved, but the preparation process becomes complex and difficult to control
Solution Approach 1:
The patent applies self-service by designing the solid electrolyte coating to inherently provide alignment guidance and self-positioning during stacking. The coated surface creates natural bonding zones that guide the electrode sheets into proper alignment automatically, eliminating the need for complex external alignment control systems or precise positioning equipment.
Solution Approach 2:
The patent changes the physical-chemical parameters of the electrode sheet surfaces by coating them with solid electrolyte. This modification alters the surface properties to create bonding capability and alignment guidance, allowing the stacking process to achieve precise alignment through material properties rather than mechanical positioning control.
3Reliability
If solid electrolyte is coated on electrode sheet surfaces, then bonding and insulation between electrodes is improved, but the preparation process becomes more complex requiring coating equipment
Solution Approach 1:
The patent merges the solid electrolyte coating process with the electrode sheet manufacturing process. By integrating the coating step into the existing production line, the patent avoids adding separate complex coating equipment. The solid electrolyte is applied during the electrode sheet fabrication process itself, combining multiple functions into a unified manufacturing flow.
4Adaptability or versatility
If composite solid electrolyte membranes are used with larger dimensional tolerances, then manufacturing adaptability is improved, but structural precision may be compromised
Solution Approach 1:
The patent uses composite solid electrolyte membranes that combine multiple materials with complementary properties. The composite structure provides both dimensional flexibility for tolerance accommodation and internal structural precision for performance. The multi-layer composite design allows each layer to contribute different functions, maintaining precision while adapting to larger dimensional variations.
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 method simplifies the battery preparation process, reduces the risk of lithium dendrite formation, and enhances the structural integrity and safety of the lithium-ion battery by ensuring good bonding and insulation between electrodes, making it suitable for industrial production with larger dimensional tolerances.
Implementation Method 1
composite solid electrolyte membranes laminated onto electrode sheets through a hot pressing process
Data Source
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AI summary
A lithium-ion battery comprises a positive electrode sheet, a composite solid electrolyte membrane and a negative electrode sheet stacked with other in that sequence. The composite solid electrolyte membrane is a continuous membrane structure and comprises a first part of composite solid electrolyte membrane and a second part of composite solid electrolyte membrane. The first part of composite solid electrolyte membrane is stacked and parallel with the at least one positive electrode sheet and the at least one negative electrode sheet. The second part of composite solid electrolyte membrane is located on a side surface of the lithium-ion battery.