A Convenient and Versatile Method To Control the Electrode Microstructure toward High-Energy Lithium-Ion Batteries

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• 作者：Hui Zhao ; Qing Yang ; Neslihan Yuca ; Min Ling ; Kenneth Higa ; Vincent S. Battaglia ; Dilworth Y. Parkinson ; Venkat Srinivasan ; Gao Liu
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：July 13, 2016
• 年：2016
• 卷：16
• 期：7
• 页码：4686-4690
• 全文大小：431K
• 年卷期：0
• ISSN：1530-6992

文摘

Control over porous electrode microstructure is critical for the continued improvement of electrochemical performance of lithium ion batteries. This paper describes a convenient and economical method for controlling electrode porosity, thereby enhancing material loading and stabilizing the cycling performance. Sacrificial NaCl is added to a Si-based electrode, which demonstrates an areal capacity of ∼4 mAh/cm<sup>2sup> at a C/10 rate (0.51 mA/cm<sup>2sup>) and an areal capacity of 3 mAh/cm<sup>2sup> at a C/3 rate (1.7 mA/cm<sup>2sup>), one of the highest material loadings reported for a Si-based anode at such a high cycling rate. X-ray microtomography confirmed the improved porous architecture of the SiO electrode with NaCl. The method developed here is expected to be compatible with the state-of-the-art lithium ion battery industrial fabrication processes and therefore holds great promise as a practical technique for boosting the electrochemical performance of lithium ion batteries without changing material systems.