Method for preparing ferric vanadate-graphene negative electrode composite material

[0027] Some preparatory work needs to be done before the preparation. Weigh 55.6g of ferrous sulfate heptahydrate and add it to 1L of deionized water to make a ferrous sulfate solution with a concentration of 0.2mol / L. Weigh 42.0g of sodium orthovanadate tetrahydrate and add Add to 1L deionized water to make a sodium orthovanadate solution with a concentration of 0.2mol / L. Its preparation method specifically comprises the following steps:

[0028] Step 1, the lamella dispersion of graphene, concrete method is as follows:

[0029] Step 11, preparing a graphene suspension with a mass fraction of 2%, weighing 9.88 g of the suspension in a stirring container;

[0030] Step 12, add 0.02g of polyvinylpyrrolidone to the above suspension, and stir to dissolve it to form a mixed solution a, because polyvinylpyrrolidone is a water-soluble high molecular polymer, which mainly plays a role in dispersion, and its aqueous solution is relatively Viscosity is very important to the dispersi

[0040] Some preparatory work needs to be done before the preparation. Weigh 13.9g of ferrous sulfate heptahydrate and add it to 1L of deionized water to make a ferrous sulfate solution with a concentration of 0.05mol / L. Weigh 10.5g of sodium orthovanadate tetrahydrate and add Add to 1L deionized water to make a sodium orthovanadate solution with a concentration of 0.05mol / L. The preparation method specifically comprises the following steps:

[0041] Step 1, the lamella dispersion of graphene, concrete method is as follows:

[0042] Step 11, preparing a graphene suspension with a mass fraction of 1%, weighing 9.88 g of the suspension in a stirring container;

[0043] Step 12, add 0.01g of polyvinylpyrrolidone to the above-mentioned suspension, and stir to dissolve it to form a mixed liquid a, because polyvinylpyrrolidone is a water-soluble high molecular polymer, which mainly plays a role in dispersion, and its aqueous solution is relatively Viscosity is very important to the

[0053] Some preparatory work needs to be done before the preparation. Weigh 139g ferrous sulfate heptahydrate and add it to 1L deionized water to make a ferrous sulfate solution with a concentration of 0.5mol / L. Weigh 105g sodium orthovanadate tetrahydrate and add it to 1L Prepare a sodium orthovanadate solution with a concentration of 0.5 mol / L in deionized water. The preparation method specifically comprises the following steps:

[0054] Step 1, the lamella dispersion of graphene, concrete method is as follows:

[0055] Step 11, preparing a graphene suspension with a mass fraction of 5%, weighing 9.88 g of the suspension in a stirring container;

[0056] Step 12, add 0.03g of polyvinylpyrrolidone to the above-mentioned suspension, and stir to dissolve it to form a mixed liquid a, because polyvinylpyrrolidone is a water-soluble high molecular polymer, which mainly plays a role in dispersion, and its aqueous solution is relatively Viscosity is very important to the dispersi