A Perylene Diimide Crystal with High Capacity and Stable Cyclability for Na-Ion Batteries

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• 作者：Wenwen Deng ; Yifei Shen ; Jiangfeng Qian ; Yuliang Cao ; Hanxi Yang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 30, 2015
• 年：2015
• 卷：7
• 期：38
• 页码：21095-21099
• 全文大小：327K
• ISSN：1944-8252

文摘

Organic Na-host materials have are now actively pursued as an attractive alternative to conventional transition-metal compounds for development of sustainable sodium ion batteries; however, most of the organic compounds reported so far suffer from their low reversible capacity and poor cyclability. Here, we report a simple perylene diimide, 3,4,9,10-perylene-bis(dicarboximide) (PTCDI), which demonstrates remarkable electrochemical performances as an organic cathode for Na-ion batteries. With the high density of redox-active carbonyl groups in a stable 蟺-conjugated structure, the PTCDI molecule can undergo a two-electron redox reaction with reversible insertion/extraction of 2 Na⁺ ions per molecular unit, demonstrating a high capacity of 140 mAh g^鈥?, a strong rate performance with a reversible capacity of 103 mAh g^鈥? at 600 mA g^鈥? (5 C,1 C = 120 mA g^鈥?) and a long-term cyclability with 90% capacity retention over 300 cycles. Because this PTCDI material is commercially available and nontoxic, it may serve as a new alternative cathode for Na-ion battery applications.