| abstract |
The invention discloses a metal vanadate nanocomposite material, a preparation method thereof and a lithium ion secondary battery, including a preparation method of metal vanadate AVO 3 (A=Ca, Sr, Ba, La), wherein the composite material comprises One or more mixtures of calcium vanadate, strontium vanadate, lanthanum vanadate and barium vanadate; the preparation method includes steps: S1 raw material selection and mixing; S2 sol preparation; S3 precursor preparation; S4 nanocomposite material preparation. The beneficial effects of the invention are as follows: the nanocomposite material is prepared by using the sol high-temperature rapid expansion method combined with the post-heat treatment process, the method can adjust the type and proportion of the metal source A, and obtain a mixture of single phase or multiple phases, and the process is simple; The stoichiometric ratio x is adjusted to obtain vanadate A x VO 3 with different vacancy concentrations; the sol treatment process and the heat treatment process are adjusted to obtain the carbon-containing nanocomposite material of amorphous, crystalline or crystalline and amorphous dual-phase structure. |