Lithium Foil Laminate Bonding for Separator Stability
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Solution Overview
Problem
The lithium foil in lithium-ion capacitors can become hard due to reactions with atmospheric water, leading to displacement and removal from the separator during the manufacturing process, which affects the positional accuracy and bond strength of the laminate.
Innovation Solution
A bonding member is used to fasten the laminate, composed of a lithium foil and a metal foil, to the separator, increasing the bond strength and preventing displacement, thereby improving positional accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the lithium foil is compression-bonded to the separator without additional fastening, then the manufacturing process is simple, but the bond strength is insufficient and the laminate may be removed or displaced
Solution Approach 1:
A bonding member (adhesive tape or resin layer) is introduced as an intermediary between the laminate and the separator. This bonding member provides sufficient bond strength to prevent displacement and removal of the laminate, while allowing the compression-bonding process to remain relatively simple. The bonding member acts as a mediator that enhances adhesion without requiring complex manufacturing steps.
2Manufacturing precision
If the lithium foil is compression-bonded to the separator, then the initial positioning is achieved, but the positional accuracy deteriorates due to displacement during transfer
Solution Approach 1:
The bonding member is applied to the separator before the laminate is positioned and compression-bonded. This preliminary action ensures that when the laminate is placed and compressed, it is immediately secured in the correct position, preventing any displacement during subsequent transfer operations. The preliminary bonding action maintains positional accuracy throughout the manufacturing process.
3Device complexity
If no bonding member is used, then the device structure is simple, but the laminate becomes detached affecting energy density and reliability
Solution Approach 1:
The bonding member serves as a simple intermediary component that significantly enhances assembly stability and reliability. By introducing this thin bonding layer, the laminate is securely attached to the separator, preventing detachment that would compromise energy density and operational reliability. The added complexity is minimal compared to the substantial improvement in reliability.
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 increased bond strength prevents the laminate from being removed or displaced, enhancing the stability and accuracy of the lithium-ion capacitor assembly, which in turn improves the energy density and operational reliability.
Implementation Method 1
a laminate 80 and a first separator 50a are compression-bonded to each other, and the laminate 80 is fastened to the first separator 50a using the bonding member 90
Data Source
Figure 1~2
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Figure 5~6
AI summary
A method of producing an electric storage device (100) includes a fastening step that includes fastening a laminate (80) that includes a lithium foil (82) and a metal foil (84) to at least one of a first separator (50a) and a second separator (55a) using a bonding member (90), and a winding step that includes winding the first separator (50a), the second separator (55a), the laminate (80), a cathode (60), and an anode (70) to obtain a wound element (40), one of the first separator (50a) and the second separator (55a) being disposed between the cathode (60) and the anode (70).