Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 12, Pages 10022-10028Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b16901
Keywords
sodium-ion battery; symmetric cell; 3.0 V; high energy density; Na3V2(PO4)(3)
Funding
- National Natural Science Fund for Distinguished Young Scholars [51425204]
- National Natural Science Foundation of China [51521001]
- National Key Research and Development Program of China [2016YFA0202603]
- Programme of Introducing Talents of Discipline to Universities [B17034]
- Yellow Crane Talent (Science & Technology) Program of Wuhan City
- Fundamental Research Funds for the Central Universities [WUT: 2016III001, 2017III040, 2017-CL-A1-42]
- project of Innovative group for low cost and long cycle life Naion batteries R&D and industrialization of Guangdong Province [2014ZT05N013]
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Symmetric sodium-ion batteries (SIBs) are considered as promising candidates for large-scale energy storage owing to the simplified manufacture and wide abundance of sodium resources. However, most symmetric SIBs suffer from suppressed energy density. Here, a superior congeneric Na4V2(PO4)(3) anode is synthesized via electro-chemical preintercalation, and a high energy density symmetric SIB (Na3V2(PO4)(3) as a cathode and Na4V2(PO4)(3) as an anode) based on the deepened redox couple of V4+/V2+ is built for the first time. When measured in half cell, both electrodes show stabilized electrochemical performance (over 3000 cycles). The symmetric SIBs exhibit an output voltage of 3.0 V and a cell-level energy density of 138 W h kg(-1). Furthermore, the sodium storage mechanism under the expanded measurement range of 0.01-3.9 V is disclosed through an in situ X-ray diffraction technique.
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