PAM Adhesive Separator for Silicon Anode Swelling Control
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Solution Overview
Problem
The challenge lies in enhancing the adhesive strength between silicon-based negative electrodes and separators in electrochemical devices while minimizing the swelling caused by volume expansion during charging and discharging, which affects the stability of the devices.
Innovation Solution
A separator for electrochemical devices is designed with an adhesive layer containing polyacrylamide (PAM)-based binders facing the silicon-based negative electrode, along with a porous polymer base and a coating layer, to increase adhesive strength and suppress swelling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If silicon-based negative electrode is used to achieve high capacity, then energy density is improved, but volume expansion and swelling occur during charging and discharging
Solution Approach 1:
The patent applies different binder materials to different locations: PAM-based binder is specifically used in the adhesive layer facing the silicon-based negative electrode to handle its expansion, while other layers may use different binders. This localized approach allows the adhesive layer to specifically address the swelling issue without affecting the high capacity benefits of silicon throughout the electrode structure.
Solution Approach 2:
The adhesive layer containing PAM-based binder acts as an intermediary between the silicon-based negative electrode and the separator. This intermediate layer absorbs and accommodates the volume expansion of silicon during charging and discharging, preventing direct mechanical stress on the separator while maintaining electrical contact and ionic conductivity.
2Strength
If adhesive layer with PAM-based binder is provided to increase adhesive strength, then bonding between separator and electrode is improved, but device complexity increases
Solution Approach 1:
The patent combines the adhesive function with the separator structure by integrating an adhesive layer directly onto the separator. This merging of functions (separator + adhesive) eliminates the need for separate adhesive components and simplifies the overall device structure while achieving strong bonding between the separator and silicon-based negative electrode.
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 solution effectively enhances adhesive strength and stabilizes the electrochemical device by minimizing volume expansion and swelling of the silicon-based negative electrode, thereby improving the device's stability.
Implementation Method 1
the silicon-based negative electrode and the adhesive layer each include polyacrylamide (PAM)-based binder, and thus an adhesive strength with the silicon-based negative electrode can be increased
Data Source
AI summary
The present disclosure relates to a separator for an electrochemical device and an electrochemical device including the same, and more specifically, to a separator for an electrochemical device and an electrochemical device including the same, in which an adhesive layer is provided to face a silicon-based negative electrode and the silicon-based negative electrode and the adhesive layer each include polyacrylamide (PAM)-based binder, and thus an adhesive strength with the silicon-based negative electrode can be increased, and the swelling of the electrochemical device to which the silicon-based negative electrode is applied can be suppressed to increase the stability of the electrochemical device.