Ruthenium-oxide-coated sodium vanadium fluorophosphate nanowires as high-power cathode materials for sodium-ion batteries

Manhua Peng; Biao Li; Huijun Yan; Dongtang Zhang; Xiayan Wang; Dingguo Xia; Guangsheng Guo

doi:10.1002/anie.201411917

Ruthenium-oxide-coated sodium vanadium fluorophosphate nanowires as high-power cathode materials for sodium-ion batteries

Angew Chem Int Ed Engl. 2015 May 26;54(22):6452-6. doi: 10.1002/anie.201411917. Epub 2015 Apr 9.

Authors

Manhua Peng¹, Biao Li², Huijun Yan², Dongtang Zhang¹, Xiayan Wang³, Dingguo Xia⁴, Guangsheng Guo¹

Affiliations

¹ Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry and Chemical Engineering, Beijing University of Technology, Beijing 100124 (P.R. China).
² Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, College of Engineering, Peking University, Beijing 100871 (P.R. China).
³ Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry and Chemical Engineering, Beijing University of Technology, Beijing 100124 (P.R. China). xiayanwang@bjut.edu.cn.
⁴ Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, College of Engineering, Peking University, Beijing 100871 (P.R. China). dgxia@pku.edu.cn.

PMID: 25864686
DOI: 10.1002/anie.201411917

Abstract

Sodium-ion batteries are a very promising alternative to lithium-ion batteries because of their reliance on an abundant supply of sodium salts, environmental benignity, and low cost. However, the low rate capability and poor long-term stability still hinder their practical application. A cathode material, formed of RuO2 -coated Na3 V2 O2 (PO4 )2 F nanowires, has a 50 nm diameter with the space group of I4/mmm. When used as a cathode material for Na-ion batteries, a reversible capacity of 120 mAh g(-1) at 1 C and 95 mAh g(-1) at 20 C can be achieved after 1000 charge-discharge cycles. The ultrahigh rate capability and enhanced cycling stability are comparable with high performance lithium cathodes. Combining first principles computational investigation with experimental observations, the excellent performance can be attributed to the uniform and highly conductive RuO2 coating and the preferred growth of the (002) plane in the Na3 V2 O2 (PO4 )2 F nanowires.

Keywords: fluorophosphates; nanowires; ruthenium oxide coating; sodium-ion batteries; vanadium.