Polymer-Templated Formation of Polydopamine-Coated SnO₂ Nanocrystals: Anodes for Cyclable Lithium-Ion Batteries

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• 作者：Beibei Jiang ; Yanjie He ; Bo Li ; Shiqiang Zhao ; Prof. Shun Wang ; Prof. Yan-Bing He and Prof. Zhiqun Lin
• 刊名：Angewandte Chemie
• 出版年：2017
• 出版时间：February 6, 2017
• 年：2017
• 卷：129
• 期：7
• 页码：1895-1898
• 全文大小：5116K
• ISSN：1521-3757

文摘

Well-controlled nanostructures and a high fraction of Sn/Li₂O interface are critical to enhance the coulombic efficiency and cyclic performance of SnO₂-based electrodes for lithium-ion batteries (LIBs). Polydopamine (PDA)-coated SnO₂ nanocrystals, composed of hundreds of PDA-coated “corn-like” SnO₂ nanoparticles (diameter ca. 5 nm) decorated along a “cob”, addressed the irreversibility issue of SnO₂-based electrodes. The PDA-coated SnO₂ were crafted by capitalizing on rationally designed bottlebrush-like hydroxypropyl cellulose-graft-poly (acrylic acid) (HPC-g-PAA) as a template and was coated with PDA to construct a passivating solid-electrolyte interphase (SEI) layer. In combination, the corn-like nanostructure and the protective PDA coating contributed to a PDA-coated SnO₂ electrode with excellent rate capability, superior long-term stability over 300 cycles, and high Sn→SnO₂ reversibility.