Method for synthesizing metal compound by using carbon thermal reduction method
A technology of metal compounds and reduction method, which is applied in the direction of phosphorus compounds, chemical instruments and methods, non-metallic elements, etc., can solve the problems of low relative capacity, capacity fading and difficulty of lithium-containing electrode materials, and achieve low cost, convenient mass production, good capacity effect
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[0073] The preparation of the precursor can also include anions. In the preparation, the metal in the starting material not only reacts with reduced carbon, but also reacts with materials containing other anions. Suitable anions include XY 4 , such as phosphate, silicate, sulfate, selenate and so on. By way of example, reduction of a transition metal followed by reaction with a phosphate-containing material yields a phosphate of the transition metal.
[0074] m 2 o 5 , (NH 4 ) 2 HPO 4 ,MPO 4 , M represents at least one metal. As an example, M contains vanadium, and phosphate can be provided by phosphate, hydrogen phosphate, dihydrogen phosphate, and phosphoric acid. The cation combined with the phosphate anion is preferably one that can produce volatile products during the reaction (such as ammonia air or water).
[0075] The compound material of the present invention may be synthesized from metal precursor compounds and active materials containing other groups in subs...
example 1
[0094] As shown in the picture, figure 2 , image 3 with Figure 4 As shown, lithium vanadium phosphate Li is synthesized from vanadium oxide (vanadium is pentavalent) 3 V 2 (PO 4 ) 3 (Vadium is trivalent), the raw materials are mixed in molar ratio and then ball milled.
[0095] 1mol V 2 o 5 Weight 181.88g;
[0096] 3mol LiH 2 PO 4 Weight 315.00g;
[0097] 2mol carbon (28g);
[0098] Carbon generally requires an excess of 0-100%.
[0099] method:
[0100] 1. Premix raw materials according to molar ratio;
[0101] 2. The mixed raw materials are wet-milled with water as the medium, and then spray-dried;
[0102] 3. Granulate the above materials;
[0103] 4. Under an inert atmosphere (nitrogen, argon or vacuum), raise the temperature at a rate of 2°C / min, and heat the above materials at 850°C;
[0104] 5. The heating time is 8 hours;
[0105] 6. Cool down at a rate of 2°C / min;
[0106] 7. Take the material out of the heating furnace when the temperature is le...
example 2
[0110] Synthesis of lithium vanadium phosphate Li from vanadium oxide (vanadium is pentavalent) 3 V 2 (PO 4 ) 3 (Vadium is trivalent), the raw materials are mixed in molar ratio and then ball milled.
[0111] 1mol V 2 o 5 Weight 181.88g;
[0112] 3 / 2mol Li 2 CO 3 Weight 110.84g;
[0113] 3mol(NH 4 ) 2 HPO 4 Weight 396.18g;
[0114] Polybutadiene equivalent to 2mol carbon (28g);
[0115] Carbon usually requires an excess of 0 to 100%.
[0116] method:
[0117] 1. Premix raw materials according to molar ratio;
[0118] 2. Granulate the mixed raw materials;
[0119]3. Under an inert atmosphere (nitrogen, argon or vacuum), raise the temperature at a rate of 2°C / min, and heat the above materials at 850°C;
[0120] 4. The heating time is 8 hours;
[0121] 5. Cool down at a rate of 2°C / min;
[0122] 6. Take the material out of the heating furnace when the temperature is less than 25°C;
[0123] 7. Make the material into powder under the protection of an inert atmo...
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