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20. Stable Silicon Anodes by Molecular Layer Deposited Artificial Zincone Coatings.

Author

Mu, Tiansheng, Zhao, Yang, Zhao, Changtai, Holmes, Nathaniel Graham, Lou, Shuaifeng, Li, Junjie, Li, Weihan, He, Mengxue, Sun, Yipeng, Du, Chunyu, Li, Ruying, Wang, Jiajun, Yin, Geping, and Sun, Xueliang

Subjects
*SOLID electrolytes, *POTASSIUM ions, *ANODES, *SURFACE coatings, *SILICON, *CHEMICAL stability, *SILICON alloys, *NANOSILICON
Abstract

A stable interface between silicon anodes and electrolytes is vital to realizing reversible electrochemistry cycling for lithium‐ion batteries. Herein, a zincone polymer coating is controllably deposited on a silicon electrode using the molecular layer deposition to serve as an artificial solid electrolyte interphase (SEI). Enhanced electrochemical cycling depends on the thickness of zincone coating. The optimal zincone coating of ≈3 nm markedly improves the lithium storage performance of silicon anodes, resulting in a high reversible capacity (1741 mA h g−1 after 100 cycles at 200 mA g−1), outstanding cycling stability (1011 mA h g−1 after 500 cycles), and superior rate capability (1580 mA h g−1 at 2 A g−1). Such remarkable electrochemical reversibility stems from the in situ conversion of the zincone coating and a zincone‐driven thin lithium fluoride (LiF)‐rich SEI, which endow the silicon electrode with superior electron/ion transport and structural stability. Meanwhile, the zincone coating demonstrates good compatibility with ether‐based electrolytes (893 mA h g−1 after 200 cycles, 970 mA h g−1 at 5 A g−1). Additionally, in situ conversion of artificial zincone coating also opens a door for constructing a functional interface on other electrode surfaces, such as lithium/sodium metal. [ABSTRACT FROM AUTHOR]

Published
2021
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21. Engineering Molecular Polymerization for Template‐Free SiOx/C Hollow Spheres as Ultrastable Anodes in Lithium‐Ion Batteries.

Author

Zhou, Xiaoming, Liu, Yang, Ren, Yang, Mu, Tiansheng, Yin, Xucai, Du, Chunyu, Huo, Hua, Cheng, Xinqun, Zuo, Pengjian, and Yin, Geping

Subjects
LITHIUM-ion batteries, SPHERES, POLYMERIZATION, COMPOSITE structures, CAPSIDS, MESOPOROUS materials
Abstract

SiOx/C composites with a void‐reserving structure are promising anodes for lithium‐ion batteries. However, the facile and controllable synthesis of uniformly dispersed SiOx and carbon components, simultaneously incorporating ample voids, still remains a great challenge. Herein, a molecular polymerization strategy is devised to construct SiOx/C hollow particles for lithium‐ion batteries. 3‐aminopropyltriethoxysilane and dialdehyde molecules are judiciously engineered as silicon and carbon precursors to produce the polymer hollow spheres (PHSs) through a one‐step aldimine condensation without any template and additive. A range of PHSs is obtained using terephthalaldehyde, glutaraldehyde, and glyoxal as the crosslinkers, demonstrating the high tunability of the strategy. Importantly, in situ pyrolysis of the PHSs warrants the homogeneous incorporation of SiOx (<5 nm) in carbon hollow capsids at a nanocluster scale. The obtained SiOx/C hollow spheres exhibit excellent Li+‐ion storage behaviors, including cycling lifespan, coulombic efficiency, and rate performance. The superior performance is attributed to the well‐dispersed SiOx nanoclusters in carbon substrate and the hollow structure. This molecular polymerization approach not only enables Si‐based hollow composites effective and scalable anode materials but also opens up a new avenue for the controllable synthesis of template‐free hollow architectures. [ABSTRACT FROM AUTHOR]

Published
2021
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