期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 5, 期 32, 页码 16622-16629出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta03484a
关键词
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资金
- National Natural Science Foundation of China [51602048, 51225204]
- Ministry of Science and Technology of the People's Republic of China [2016YFA0202500]
- Science Technology Program of Jilin Province [20150520027JH]
Recently, room temperature sodium ion batteries (SIBs) have attracted considerable attention as one of the promising candidates to replace lithium ion batteries. Nevertheless, achieving high capacity and cycling stability remains a great challenge for the electrode materials of SIBs. Compared to the traditional inorganic electrode materials, organic ones should be more attractive because of their easier sodium (Na)-transport accessibility as well as their diversities of organic skeleton and functional groups. In this work, a new carboxyl-based organic, sodium trimesic (Na3TM), is proposed for the first time as an anode material for SIBs, and its Na-storage properties are significantly enhanced by constructing three-dimensional conductive networks of carbon nanotubes (CNT-NWs) in the Na3TM microparticles. In comparison to the pure Na3TM exhibiting almost inactive Na storage, the prepared CNT-NWs@Na3TM composite delivers a reversible capacity of 214.6 mA h g(-1) at 0.1 A g(-1), and exhibits excellent rate performance with the specific capacities of 149 and 87.5 mA h g(-1) at 1 and 10 A g(-1), respectively. The CNT-NWs@Na3TM also exhibit good cycling performance. More importantly, the Na-storage mechanism of CNT-NWs@Na3TM was ascertained using several ex situ technologies of Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and 23Na solid-state nuclear magnetic resonance spectroscopy. It is discovered that the two Na uptake/release processes were reversible during cycling and contributed to the Na-storage capacity except for the 1st sodiation process with a three Na uptake.
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