Issue 29, 2016

A CNT cocoon on sodium manganate nanotubes forming a core/branch cathode coupled with a helical carbon nanofibre anode for enhanced sodium ion batteries

Abstract

The commercial advancement of high-performance sodium ion batteries is highly dependent on the judicious design/construction of advanced electrode materials. In this work, we construct novel P2-type Na0.7MnO2.05 nanotube/carbon nanotube (NMO/CNT) core/branch composites via a powerful three-step process for sodium ion battery (SIB) applications. P2-type Na0.7MnO2.05 nanotubes of about 500 nm have been, for the first time to our knowledge, fabricated and further modified by cocoon-like CNT branches. The cycling performance is increased significantly with an encouraging capacity retention of 88% at 0.1 A g−1 after 100 cycles due to enhanced electrochemical kinetics and improved structural stabilization resulting from the CNT cocoon branches. To assess the practical functionality as a full cell, a helical carbon nanofibre (HCNF) anode with capacitive-dominated sodium ion storage is also developed to match with the NMO/CNT cathode. The new-type NMO/CNT//HCNF full cells exhibit encouraging cycle performance with a capacity retention of 71% after 200 cycles at 100 mA g−1 and superior rate performance to the unmodified NMO//HCNF full cells. Our electrode design strategy provides a new way for fabricating high-performance electrode materials for SIBs.

Graphical abstract: A CNT cocoon on sodium manganate nanotubes forming a core/branch cathode coupled with a helical carbon nanofibre anode for enhanced sodium ion batteries

Supplementary files

Article information

Article type
Communication
Submitted
17 juin 2016
Accepted
26 juin 2016
First published
28 juin 2016

J. Mater. Chem. A, 2016,4, 11207-11213

A CNT cocoon on sodium manganate nanotubes forming a core/branch cathode coupled with a helical carbon nanofibre anode for enhanced sodium ion batteries

Y. Zhong, X. Xia, J. Zhan, X. Wang and J. Tu, J. Mater. Chem. A, 2016, 4, 11207 DOI: 10.1039/C6TA05069G

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