960化工网
Development of a macroporous-spherical polyanionic compound (TiO)2P2O7 as a novel anode material for sodium ion batteries
Shuming Zhang,Yu Liu,Na Zhang,Kuan Zhao,Jianhua Yang,Shiyang He
RSC Advances Pub Date : 05/25/2016 00:00:00 , DOI:10.1039/C6RA07344A
Abstract

The phosphate-based polyanionic compound with the formula (TiO)2P2O7 was synthesized by a simple precipitation method with a soft template as a novel anode material for sodium ion batteries for the first time. The polyanionic compound (TiO)2P2O7 with a macroporous-spherical structure exhibited an initial specific capacity of 293.0 mA h g−1 at 0.1C in the voltage range of 0.01–2.5 V vs. Na+/Na. The reversible capacity remained at 200.9 mA h g−1 after 100 cycles. It is attractive that the macroporous-spherical (TiO)2P2O7 delivered an extremely stable cycling performance at a high charge rate of 2.5C. A high capacity retention of 85.1% was obtained after 1100 cycles with an initial specific capacity of 112.7 mA h g−1. The ex situ XRD and XPS analysis indicates that the excellent cycle stability and high rate capability are attributed to the intrinsic 3D framework structure and well-connected macroporous-spherical morphology of (TiO)2P2O7. The macroporous-spherical (TiO)2P2O7 is a promising anode for sodium ion batteries.

Graphical abstract: Development of a macroporous-spherical polyanionic compound (TiO)2P2O7 as a novel anode material for sodium ion batteries
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