A preparation method of lithium iron phosphate material and a lithium ion battery
A technology of lithium iron phosphate and iron phosphate, applied in the field of preparation of lithium iron phosphate materials, can solve the problems of easy agglomeration of impurity raw materials, low cycle efficiency, low capacity of lithium iron phosphate, etc., and achieves good capacity retention rate, high specific capacity, small particle effect
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[0021] Accordingly, the invention provides a method for preparing lithium iron phosphate material, comprising the steps of:
[0022] Step 1. Prepare alcohol solution of lithium source: disperse iron phosphate in alcohol solution to obtain iron phosphate dispersion; in this step, add iron phosphate to alcohol solution, and then use a dispersing machine, for example: Fluko The dispersing machine disperses strongly to obtain a dispersion of iron phosphate. In the dispersion of iron phosphate, the concentration of iron phosphate is 1~5mol / L; wherein, the iron phosphate is nano iron phosphate with a particle size of 50-500nm In the present invention, adopting single ferric phosphate to replace phosphorus source, iron source to prepare lithium iron phosphate material, can avoid the generation of more side reactions, because the kind of raw material is more, the side reaction in the middle may increase, to the generation The final lithium iron phosphate material is unfavorable; and i...
Embodiment 1
[0034] 1) Prepare the alcohol solution of the lithium source: weigh 2 mol of lithium acetate, dilute it to 2L with absolute ethanol, stir and dissolve it thoroughly, and obtain the alcohol solution of the lithium source, which is designated as liquid A;
[0035] 2) Preparation of ferric phosphate dispersion: Weigh 2 mol of nanometer ferric phosphate, dilute to 1 L with absolute ethanol, and disperse for 20 minutes with a Fluko high-speed shear disperser to obtain a ferric phosphate dispersion, which is designated as liquid B;
[0036] 3) Add liquid B to the magnetically driven high-pressure reactor, then slowly add liquid A to liquid B, control the flow rate of liquid A to 100ml / min, and then add 1.2mol of pure water; after completion, use absolute ethanol The volume of the above mixed liquid was fixed to 5L; then CO gas was introduced immediately, and the flow rate was controlled at 100L / h. After 20 minutes, the reaction kettle was sealed, and the temperature was raised to 180...
Embodiment 2
[0039] 1) Prepare the alcohol solution of the lithium source: weigh 2 mol of lithium acetate, dilute it to 2L with absolute ethanol, stir and dissolve it thoroughly, and obtain the alcohol solution of the lithium source, which is designated as liquid A;
[0040] 2) Preparation of iron phosphate dispersion: Weigh 2 mol of nano-iron phosphate and 2 mol of ascorbic acid, dilute to 1 L with absolute ethanol, and disperse for 20 minutes with a Fluko high-speed shearing disperser to obtain a dispersion of iron phosphate, which is designated as liquid B ;
[0041] 3) Add liquid B to the magnetic drive high-pressure reactor, then slowly add liquid A to liquid B, control the flow rate of liquid A to 100ml / min, and then add 1.2mol of pure water; The above mixed solution was fixed to 5L; then nitrogen gas was introduced immediately, and the flow rate was controlled at 100L / h. After 20 minutes, the reaction kettle was sealed, and the temperature was raised to 180°C. After keeping the temp...
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