Superior Sodium Storage of Carbon-Coated NaV6O15 Nanotube Cathode: Pseudocapacitance Versus Intercalation

Xuexia Song; Jicheng Li; Zhaohui Li; Qizhen Xiao; Gangtie Lei; Zhongliang Hu; Yanhuai Ding; Hirbod Maleki Kheimeh Sari; Xifei Li

doi:10.1021/acsami.8b20494

Superior Sodium Storage of Carbon-Coated NaV₆O₁₅ Nanotube Cathode: Pseudocapacitance Versus Intercalation

ACS Appl Mater Interfaces. 2019 Mar 20;11(11):10631-10641. doi: 10.1021/acsami.8b20494. Epub 2019 Mar 6.

Authors

Xuexia Song^{1

2

3}, Jicheng Li¹, Zhaohui Li¹, Qizhen Xiao¹, Gangtie Lei¹, Zhongliang Hu⁴, Yanhuai Ding⁵, Hirbod Maleki Kheimeh Sari^{2

3}, Xifei Li^{2

3}

Affiliations

¹ Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry , Xiangtan University , Hunan 411105 , P. R. China.
² Institute of Advanced Electrochemical Energy & School of Materials Science and Engineering , Xi'an University of Technology , Xi'an , Shaanxi 710048 , P. R. China.
³ Shaanxi International Joint Research Centre of Surface Technology for Energy Storage Materials , Xi'an , Shaanxi 710048 , China.
⁴ College of Metallurgy and Material Engineering , Hunan University of Technology , Hunan 412007 , P. R. China.
⁵ Institute of Fundamental Mechanics and Materials Engineering , Xiangtan University , Hunan 411105 , P. R. China.

PMID: 30799600
DOI: 10.1021/acsami.8b20494

Abstract

To realize the effect of Na⁺ pseudocapacitance on the sodium storage of cathode materials, clewlike carbon-coated sodium vanadium bronze (NaV₆O₁₅) nanotubes (Na-VBNT@C) were synthesized via a facile combined sol-gel/hydrothermal method. The resultant Na-VBNT@C delivers high reversible capacities of 209 and 105 mA h g^-1 at the rates of 0.1 and 10 C, respectively. Notably, at the higher rate of 5 C (1250 mA g^-1), it can retain 94% of the initial capacity after 3000 cycles. It was found that the outstanding rate performance and the long-term cycling life of Na-VBNT@C are primarily due to the Na⁺ pseudocapacitance. Our study reveals that the design of Na⁺ pseudocapacitance is beneficial for harvesting the superior performance of NaV₆O₁₅ cathode material in sodium-ion batteries.

Keywords: hydrothermal; nanotube; pseudocapacitance; sodium-ion batteries; vanadium bronze.