TY - JOUR
T1 - Eliminating crystal water enables enhanced sodium storage performance in an oxalate-phosphate cathode material
AU - Sun, Kena
AU - Long, Huiwu
AU - Jie, Xiaowu
AU - Li, Huangxu
PY - 2023/8
Y1 - 2023/8
N2 - The oxalate-phosphate polyanion-mixed cathode materials are promising for sodium-ion batteries (SIBs) due to their unique open-framework structures and high voltage property. However, materials of this type generally contain crystal water molecules in the lattice frameworks, which may affect their energy storage properties. This work aims to disclose the impacts of crystal water on physiochemical and electrochemical properties of Na2(VO)2(HPO4)2(C2O4)·2H2O (NVPC-W). It shows that the water molecules can be eliminated by vacuum drying at 150 °C. The elimination of water molecules does not change the crystal phase of the material, while the obtained Na2(VO)2(HPO4)2(C2O4) (NVPC) exhibits significant improvements in cycling stability, Coulombic efficiency, as well as rate performances. Kinetics analysis indicates that the existence of lattice water molecules hinders sodium-ion diffusion and promotes the degradation of electrodes. We believe the findings can help to develop high-performance cathode materials. © 2023 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia
Medica, Chinese Academy of Medical Sciences.
AB - The oxalate-phosphate polyanion-mixed cathode materials are promising for sodium-ion batteries (SIBs) due to their unique open-framework structures and high voltage property. However, materials of this type generally contain crystal water molecules in the lattice frameworks, which may affect their energy storage properties. This work aims to disclose the impacts of crystal water on physiochemical and electrochemical properties of Na2(VO)2(HPO4)2(C2O4)·2H2O (NVPC-W). It shows that the water molecules can be eliminated by vacuum drying at 150 °C. The elimination of water molecules does not change the crystal phase of the material, while the obtained Na2(VO)2(HPO4)2(C2O4) (NVPC) exhibits significant improvements in cycling stability, Coulombic efficiency, as well as rate performances. Kinetics analysis indicates that the existence of lattice water molecules hinders sodium-ion diffusion and promotes the degradation of electrodes. We believe the findings can help to develop high-performance cathode materials. © 2023 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia
Medica, Chinese Academy of Medical Sciences.
KW - Battery
KW - Cathode
KW - Crystal water
KW - Energy storage
KW - V-based materials
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UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85162179490&origin=recordpage
U2 - 10.1016/j.cclet.2022.107898
DO - 10.1016/j.cclet.2022.107898
M3 - RGC 21 - Publication in refereed journal
SN - 1001-8417
VL - 34
JO - Chinese Chemical Letters
JF - Chinese Chemical Letters
IS - 8
M1 - 107898
ER -
