Preparation method of lithium manganese phosphate-coated lithium-rich manganese-based cathode material and lithium battery
A lithium manganese iron phosphate, lithium-rich manganese-based technology, applied in the field of electrochemical materials, can solve the problems of uneven coating, large material polarization, and inability to effectively control the coating layer, and achieve simple process, low reaction temperature, Thickness and shape controllable effect
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[0031] The preparation steps of the organic phase mainly include adding extractant and diluent in the beaker according to the volume ratio (1-3):1, mixing uniformly, then adding ammonia water with corresponding volume ratio to adjust the pH, and finally adding 0.1-0.8mol / L Continue to stir the mixed metal ion solution, separate the organic phase with a separatory funnel, and wash with deionized water to obtain an organic phase loaded with metal ions.
[0032] The extractant here is any one of naphthenic acid and tributyl phosphate, and the coordinating diluent is kerosene. Kerosene is used as the diluent, which does not react with the selected extractant, and can play the role of diluting the extractant. It is used in combination to make the extraction effect better.
[0033] The mixed metal ion solution in this step is Fe 2+ , Mn 2+ The mixed solution of which the ratio is c(Fe 2+ ): (Mn 2+ )=(1-9):1.
[0034] And the Fe in the mixed metal ion solution 2+ , Mn 2+ The k...
Embodiment 1
[0048] In this example, the process of preparing lithium manganese iron phosphate coated lithium-rich manganese-based positive electrode material is as follows:
[0049] 1) Preparation of organic phase;
[0050] Add 30mL of industrial grade tributyl phosphate and 10mL of kerosene to the beaker in a volume ratio of 1:1, mix evenly under stirring, then add 8mL of ammonia water for saponification, adjust the pH to 7, and finally add 0.1mol / L of mixed metals Ion solution 200mL, wherein the mixed metal ion solution is ferrous sulfate, manganese sulfate molar ratio is 0.9:0.1, after continuing to stir for 0.5h, pour it into a separatory funnel and let it stand for 10 minutes. At this time, the liquid is divided into two phases. Wash with deionized water two to three times to obtain 40 mL of organic phase loaded with metal ions.
[0051] 2) Preparation of the aqueous phase;
[0052] Weigh 0.4788g of LiOH in a beaker, add 80mL of deionized water, and after all the solids are dissolv...
Embodiment 2
[0070] In this example, the process of preparing lithium manganese iron phosphate coated lithium-rich manganese-based positive electrode material is as follows:
[0071] 1) prepare the organic phase;
[0072] Add 30mL of industrial grade tributyl phosphate and 20mL of isooctyl alcohol to the beaker in sequence at a volume ratio of 3:2, mix uniformly under magnetic stirring, then add 8mL of ammonia water with a volume ratio of 1:1, adjust the pH to 8, and finally add 0.3mol / L mixed metal ion solution 200mL, c(Fe 2+ ):c(Mn 2+ ) = 0.8: 0.2, after stirring for 20 minutes, pour it into a separatory funnel and let it stand for liquid separation, separate the organic phase, and wash it with deionized water two to three times to obtain the organic phase loaded with metal ions.
[0073] 2) Preparation of the aqueous phase;
[0074] Weigh 1.3464g of LiOH, add 100mL of deionized water, after all the solids are dissolved, add 20mL of H 3 PO 4 (concentration is 3mol / L), after stirring...
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