Gamma titanium phosphate as an electrode material for Li-ion and Na-ion storage: performance and mechanism. Issue 46 (11th November 2016)

• Record Type: Journal Article
• Authors: Xiang, Xinghua; Li, Xiaocheng; Chen, Kongyao; Tang, Yang; Wan, Min; Ding, Xuli; Xue, Lihong; Zhang, Wuxing; Huang, Yunhui
• Is Part Of: Journal of materials chemistry. Volume 4:Issue 46(2016)
• Page Start: 18084
• Page End: 18090
• Publication Date: 2016-11-11
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6ta07751j
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Layered G-TiP can store Li + and Na + ions via a local ion exchange process and redox reaction. Despite the large radius of Na +, G-TiP exhibits a higher structural tolerance upon (de)sodiation and a better capacity retention at low voltage. Abstract : Gamma titanium phosphate (G-TiP) possesses a lamellar framework with larger interlayer spacing than α-type TiP, in which the protons within the P–OH groups can be exchanged by alien ions. Herein, the electrochemical performance of the bulk G-TiP in both lithium and sodium storage has been systematically investigated. The results reveal that the layered G-TiP can store both Li + and Na + ions via a local ion exchange process and redox reaction in a wide voltage range. Despite the large radius of Na +, G-TiP exhibits a higher structural tolerance upon (de)sodiation and better capacity retention when cycled at low voltage. For a Na-ion cell, the G-TiP electrode delivers a specific capacity of 161.3 mA h g −1 within 0.1–2.8 V, showing an obvious plateau in the range of 1.6–2.2 V with a solid solution reaction. For a Li-ion cell, a reversible capacity of 109 mA h g −1 is attained within 0.8–2.8 V, and a voltage plateau occurs at 2.2–2.6 V.