Low-Potential Sodium Insertion in a NASICON-Type Structure through the Ti(III)/Ti(II) Redox Couple

详细信息    查看全文

• 作者：P. Senguttuvan ; G. Rousse ; M. E. Arroyo y de Dompablo ; Herv茅 Vezin ; J.-M. Tarascon ; M. R. Palac铆n
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：March 13, 2013
• 年：2013
• 卷：135
• 期：10
• 页码：3897-3903
• 全文大小：441K
• 年卷期：v.135,no.10(March 13, 2013)
• ISSN：1520-5126

文摘

We report the direct synthesis of powder Na₃Ti₂(PO₄)₃ together with its low-potential electrochemical performance and crystal structure elucidation for the reduced and oxidized phases. First-principles calculations at the density functional theory level have been performed to gain further insight into the electrochemistry of Ti(IV)/Ti(III) and Ti(III)/Ti(II) redox couples in these sodium superionic conductor (NASICON) compounds. Finally, we have validated the concept of full-titanium-based sodium ion cells through the assembly of symmetric cells involving Na₃Ti₂(PO₄)₃ as both positive and negative electrode materials operating at an average potential of 1.7 V.