期刊
ACS APPLIED ENERGY MATERIALS
卷 1, 期 11, 页码 5842-5846出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b01269
关键词
sodium-ion battery; NASICON; Na4MnV(PO4)(3); phase transitions; operando XRD
资金
- Russian Science Foundation [17-73-30006]
- Moscow State University Program of Development
- Russian Science Foundation [17-73-30006] Funding Source: Russian Science Foundation
Sodium (de)intercalation in the Na4MnV(PO4)(3) NASICON-type cathode has been studied with operando synchrotron X-ray powder diffraction and galvanostatic cycling up to 3.8 and 4.0 V cutoff voltages. Symmetry reduction from rhombohedral to monoclinic was observed immediately after the start of the electrochemical desodiation, with restoring of the rhombohedral phase at 3.8 V. Cycling within the 2.5-3.8 V potential range proceeds through both solid-solution and two-phase processes. An additional voltage plateau at similar to 3.9 V is observed, associated with unlocking of the Na1 site in the rhombohedral phase. Reverse insertion of Na+ cations proceeds via the entire solid-solution region. The experimentally observed discharge capacity increases by approximate to 14% after raising cutoff voltage.
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