A CNT cocoon on sodium manganate nanotubes forming a core/branch cathode coupled with a helical carbon nanofibre anode for enhanced sodium ion batteries. Issue 29 (8th July 2016)

• Record Type: Journal Article
• Authors: Zhong, Yu; Xia, Xinhui; Zhan, Jiye; Wang, Xiuli; Tu, Jiangping
• Is Part Of: Journal of materials chemistry. Volume 4:Issue 29(2016)
• Page Start: 11207
• Page End: 11213
• Publication Date: 2016-07-08
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6ta05069g
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Full cells based on a P2-type Na0.7 MnO2.05 nanotube/CNT cathode and a helical carbon nanofiber anode are developed and show enhanced sodium ion storage capacity. 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 Na0.7 MnO2.05 nanotube/carbon nanotube (NMO/CNT) core/branch composites via a powerful three-step process for sodium ion battery (SIB) applications. P2-type Na0.7 MnO2.05 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.