研究目的
To improve the electrochemical properties of Si film electrodes by applying a patterning process and using a Ti-Ni shape memory alloy as a current collector.
研究成果
The patterned Si film electrode with a Ti-Ni current collector demonstrated improved electrochemical properties, including higher initial efficiency and better capacity retention, compared to a continuous Si film electrode. The patterning process and the use of a superelastic Ti-Ni current collector contributed to enhanced structural stability during electrochemical reactions.
研究不足
The study does not address the long-term stability of the patterned Si film electrodes beyond 90 cycles. The effect of the patterning process on the mechanical properties of the Si film under repeated cycling is not fully explored.
1：Experimental Design and Method Selection:
The study involved fabricating a patterned Si film electrode on a Ti-50.5Ni current collector using an expanded metal foil as a mask. The electrochemical properties were compared with a continuous Si film electrode. Structural and mechanical properties of the Ti-Ni current collector were investigated using DSC, XRD, and tensile tests.
2：5Ni current collector using an expanded metal foil as a mask. The electrochemical properties were compared with a continuous Si film electrode. Structural and mechanical properties of the Ti-Ni current collector were investigated using DSC, XRD, and tensile tests.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Ti-50.5Ni ingot was fabricated by vacuum arc melting and processed into sheets. Si films were deposited using DC magnetron sputtering.
3：5Ni ingot was fabricated by vacuum arc melting and processed into sheets. Si films were deposited using DC magnetron sputtering.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included DSC (TA instrument DSC Q20), XRD (D2 PHASER), FE-SEM (MIRA3 LM), and a battery cycler (WBCS3000). Materials included Ti-50.5Ni alloy, Si target, and expanded metal foil.
4：0). Materials included Ti-5Ni alloy, Si target, and expanded metal foil.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The Ti-Ni alloy was processed and characterized before Si film deposition. Si films were deposited and patterned using an expanded metal mask. Electrochemical properties were evaluated using coin-type cells.
5：Data Analysis Methods:
Electrochemical performance was analyzed through charge-discharge tests and cycle performance evaluations. Structural analysis was conducted using XRD and Raman spectroscopy.
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