Exploration of Ca0.5Ti2(PO4)3@carbon Nanocomposite as the High-Rate Negative Electrode for Na-Ion Batteries

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• 作者：Zhixuan Wei ; Xing Meng ; Ye Yao ; Qiang Liu ; Chunzhong Wang ; Yingjin Wei ; Fei DuGang Chen
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：December 28, 2016
• 年：2016
• 卷：8
• 期：51
• 页码：35336-35341
• 全文大小：475K
• ISSN：1944-8252

文摘

Exploring suitable electrode materials with high specific capacity and high-rate capability is a challenging goal for the development of Na-ion batteries. Here, we report a NASICON-structured compound, Ca_0.5Ti₂(PO₄)₃, with respect to its synthesis and electrochemical properties. The electrode is found to enable fast Na⁺ ion diffusion owing to the rich crystallographic vacancies, affording a reversible capacity of 264 mA h g^–1 between 3.0 and 0.01 V. In particular, the hybrid Ca_0.5Ti₂(PO₄)₃@carbon exhibits remarkable rate performance with a discharge capacity of nearly 45 mA h g^–1 at a current density of 20 A g^–1, which is attributed to the pseudocapacitive effect.