1 Structure of VOPO4
VOPO4 is a homogeneous polycrystalline compound with 7 crystal forms. Their crystal parameters and structure diagrams are respectively seen. It can be seen from the following that the VOPO 4 has an open three-dimensional tunnel structure, and the VOPO 4 has a layered tunnel structure. In these structures, the connection and arrangement of the VO 6 octahedron and the PO4 tetrahedron are slightly different.
1 Initial reversible capacity and discharge voltage of different crystal forms VOPO4
The preparation of VOPO4 is mainly carried out by solid phase synthesis, that is, by mixing NH4H 2 PO 4 or H 3 PO 4 and V 2 O 5 in a stoichiometric ratio, or by using H 2 VOPO 4 and VOHPO 4 as reactants, respectively, in air or oxygen. Heat to 500 or more in the atmosphere. VOPO 4 of different crystal forms can be synthesized by changing the reaction conditions or reactants. NH 4 H 2 PO 4 and V 2O 5 were used as raw materials for synthesis, calcined in 700 oxygen atmosphere for 3 h, ground, and calcined at 700 times for 5 h to obtain VOPO 4. If the calcination time was extended to 14 h, the obtained product was obtained. For VOPO 4.
There are two preparation methods for VOPO4 and VOPO 4: VOPO 42H2O as the reactant, which is kept at 500 and 700 for 14 h, or (VO)2P2O7 as the precursor, calcined in 500 air atmosphere for 14 h, respectively. VOPO 4.SC Lim, etc. will be obtained by calcining a mixture of H 3 PO 4 and V 2 O 5 or VOH PO 4 0 5H 2 O precursor for 14 h in 500 air for 2 h / min and 4 2 / min. The hydrothermally synthesized monoclinic VPO 4H2 O is oxidized in an oxygen atmosphere below 550 to prepare VOPO for the first time. 4. In addition, VOPO 4 can also be prepared by electrochemical oxidation, ie in LiPF 6/ EC+ DMC. The hydrogen in the H 2 VOPO 4 compound is electrochemically removed from the solution to obtain VOPO 4 .
2 unit cell parameters of various crystal forms VOPO 4 Table 2 T he cell parameters of VOPO 4 with different crystalline structures phase crystal unit cell parameters / nm abc
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