Zn2+ doped TiO2/C with enhanced sodium-ion storage properties. Issue 13 (September 2017)

• Record Type: Journal Article
• Authors: Li, Yong-Ni; Su, Jing; Lv, Xiao-Yan; Long, Yun-Fei; Yu, Hang; Huang, Rong-Rong; Xie, Yong-Chun; Wen, Yan-Xuan
• Is Part Of: Ceramics international. Volume 43:Issue 13(2017)
• Page Start: 10326
• Page End: 10332
• Publication Date: 2017-09
• Subjects: B. Microstructure -- E. Batteries -- E. Electrodes -- Sodium-ion batteries -- Anatase TiO2 -- Zinc doping; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.05.063
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: To improve the performance of anatase TiO2 as an anode material for sodium-ion batteries, Zn 2+ -doped TiO2 /C composites are synthesized by a co-precipitation method. The results of XRD, EPR and XPS demonstrate that Zn 2+ occupies at the Ti 4+ site of TiO2 to form a solid-solution, resulting in an expansion of lattice and an increase of Ti 3+ content. The expansion of lattice can enhance the stability of the crystal structure of TiO2 . The increase of Ti 3+ content can improve the conductivity of TiO2 . Therefore, Ti0.94 Zn0.06 O2 /C delivers a reversible capacity of 160 mA h g −1 with a capacity retention of 96% after 100 cycles at 5 C. Even charged/discharged at 10 C, this sample still exhibits a reversible capacity of 117 mA h g −1, comparing to 86 mA h g −1 for TiO2 /C. The enhanced electrochemical performances can be ascribed to the improvement of the conductivity and the structural stability of TiO2 due to Zn 2+ -doping. Therefore, Ti0.94 Zn0.06 O2 /C is an attractive anode material of sodium-ion batteries.