Rapid Synthetic Route to Nanocrystalline Carbon-Mixed Metal Oxide Nanocomposites with Enhanced Electrode Functionality

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• 作者：Jang Mee Lee ; Tae Ha Gu ; Nam Hee Kwon ; Seung Mi Oh ; Seong-Ju Hwang
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：April 28, 2016
• 年：2016
• 卷：120
• 期：16
• 页码：8451-8460
• 全文大小：617K
• 年卷期：0
• ISSN：1932-7455

文摘

A rapid synthetic route to nanocrystalline carbon-incorporated mixed metal oxide nanocomposites with enhanced electrode performance for lithium ion batteries is developed by applying a very short heat-treatment of layered double hydroxide (LDH) precursor under C₂H₂ flow. Employing C₂H₂ atmosphere makes possible the rapid synthesis of nanocrystalline C–NiO–NiFe₂O₄ nanocomposite via the calcination of the Ni–Fe–LDH precursor at 300 °C in a very short period of 5 min. In the case of ambient atmosphere, a prolonged calcination time of several hours is demanded to induce a complete phase transformation from Ni–Fe–LDH to electrochemically active NiO–NiFe₂O₄ nanocomposite, highlighting the usefulness of C₂H₂ atmosphere in promoting the formation of mixed metal oxide nanocomposite. The present C–NiO–NiFe₂O₄ nanocomposite shows much better anode performance for lithium ion batteries with greater discharge capacity and better cyclability than do the NiO–NiFe₂O₄ nanocomposites prepared by the prolonged calcination of LDH under ambient atmosphere. The superior electrode activity of the present C–NiO–NiFe₂O₄ nanocomposite is attributable to the optimization of charge transfer induced by the enhanced electrical conductivity and a short diffusion length of Li ion. The present C₂H₂-assisted phase transition of LDH precursor provides a convenient, economic, and scalable synthetic way to carbon–mixed metal oxide nanocomposites with promising electrode performance for lithium ion batteries.