A kind of lithium manganese iron phosphate composite material and its preparation method and application
A technology of lithium iron manganese phosphate and composite material, applied in the field of lithium ion batteries, can solve the problems of increased hygroscopicity, shortened lithium ion migration path, unsatisfactory electrochemical performance and cycle performance, etc., and achieves low cost and simple and easy preparation method. control, excellent structural stability and anti-hygroscopic effect
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[0043] The present invention also provides a preparation method of the lithium manganese iron phosphate composite material described in the above technical solution, comprising the following steps:
[0044] a) Fe source compound, Mn source compound, M source compound, carbon source, PO 4 3- The compound is mixed with water to form a precursor mixture A;
[0045] b) mixing the precursor mixture A obtained in step a) with the Li source compound to form a precursor mixture B;
[0046] c) The mixed solution C formed by mixing the Nb source compound and water is slowly added to the precursor mixture B obtained in step b) to form a precursor slurry D;
[0047] d) drying the precursor slurry D obtained in step c), calcining in a non-oxidizing atmosphere, and cooling to obtain a lithium manganese iron phosphate composite material.
[0048] In the present invention, Fe source compound, Mn source compound, M source compound, carbon source, PO 4 3- Compound and water are mixed to fo...
Embodiment 1
[0075] (1) Disperse 81.2g of ferrous oxalate dihydrate, 74.45g of manganese tetraoxide, 1.8g of magnesium oxide and 20g of glucose in 400g of deionized water and mix evenly to obtain a mixture; control the temperature of the above mixture to 60°C, add 173.6g of 85wt % phosphoric acid dispersed for 4h to form the precursor mixture A.
[0076] (2) Add 63.9 g of lithium carbonate to the precursor mixture A obtained in step (1) and disperse for 2 hours to form the precursor mixture B.
[0077] (3) A solution C formed by mixing 4.2 g of niobium oxalate and 20 g of deionized water and heating to 60° C. was slowly added to the precursor mixture B obtained in step (2) to form a precursor slurry D.
[0078] (4) Spray-dry the precursor slurry D obtained in step (3) to obtain a powder, and then calcine the above-mentioned powder at a high temperature under the protection of pure nitrogen at a calcination temperature of 700°C for 10 hours, and obtain after cooling Lithium manganese phosp...
Embodiment 2
[0082] (1) Disperse 26.4g of ferric oxide, 120.75g of manganese carbonate, 3.57g of cobalt carbonate and 50g of polyvinyl alcohol in 570g of deionized water and mix uniformly to obtain a mixture; control the temperature of the mixture to 45°C, add 173.6g of 85wt% Phosphoric acid was dispersed for 2h to form precursor mixture A.
[0083] (2) Add 70 g of lithium hydroxide to the precursor mixture A obtained in step (1) and disperse for 3 hours to form the precursor mixture B.
[0084] (3) Solution C formed by mixing 11.2 g of ammonium niobium oxalate and 60 g of deionized water and heating to 60° C. was slowly added to the precursor mixture B obtained in step (2) to form precursor slurry D.
[0085] (4) The precursor slurry D obtained in step (3) is spray-dried to obtain a powder, and then the above-mentioned powder is calcined at a high temperature under the protection of a nitrogen-hydrogen mixed gas containing 5% hydrogen and 95% nitrogen. The temperature is 650°C, the calci...
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