Preparation method and application of lithium iron phosphate positive electrode material
A positive electrode material, lithium iron phosphate technology, applied in the field of preparation of lithium iron phosphate positive electrode material, can solve the problems of poor rate performance, poor performance, and many control points, to achieve performance optimization and improvement, easy to operate the preparation process, and the preparation process simple effect
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[0032] Example 1
[0033] A method of preparation of lithium iron phosphate positive material, including the following steps:
[0034] (1) Press the ferric iron, pelletary, lithium hydroxide, and lithium hydroxide to 1: 1.03: 1.07, weigh weight, then add 4.5% glucose and 2.36% polyacrylic acid as carbon source, additives 0.08% of titanium oxide and 0.10% nitrate were mixed, and the mixed material particle diameter (D50) obtained after mixing the high-efficiency mixture was 35 μm;
[0035] (2) The mixed material was raised to 650 ° C at a rate of 3 ° C / min under a pure nitrogen atmosphere for sintering for 5 h, and the gas flow was pulverized and pulverized, pulverized particle size (D50) 1.2 μm;
[0036] (3) The pulverized material was subjected to secondary sintering, raised to 720 ° C at a rate of 5 ° C / min for sintering 8 h, and the ethanol 140 g / kg was introduced, and the lithium iron phosphate positive material for the production of ethanol was obtained. .
Example Embodiment
[0037] Example 2
[0038] A method of preparation of lithium iron phosphate positive material, including the following steps:
[0039] (1) Press the ferrite, lithium carbonate, and phosphate, a hydroxide is 1: 1.04: 1.09, weigh weight, add 6.5% sucrose and 4.6% polyvinyl alcohol as a carbon source, additives 0.24% ammonium metavanadate and 0.22% nine-water glycome were mixed, and the mixed material particle diameter (D50) obtained after mixing the high-efficiency mixture was mixed into 23 μm;
[0040] (2) The mixture was raised to 690 ° C at a rate of 4 ° C / min under a pure nitrogen gas atmosphere for sintering for 6 h, and the airflow was pulverized, and the pulverized particle size (D50) was 1.4 μm;
[0041] (3) The pulverized material was subjected to secondary sintering, raised to 740 ° C at a rate of 6.5 ° C / min for sintering 8 h, and the ethylene glycol 185 g / kg was introduced, and the lithium iron phosphate was obtained after cooling. Positive material.
Example Embodiment
[0042] Example 3
[0043] A method of preparation of lithium iron phosphate positive material, including the following steps:
[0044] (1) Press the ferrite and lithium hydroxide according to the Fe: p: Li molar ratio of 1: 1.06: 1.10, weigh weight, add 5.5% sucrose, 3.5% polyethylene glycol, 1.2% oxalic acid as a carbon source, additive The mixture of 0.13% of titanium oxide and 0.16% magnesium oxide was mixed, and the mixed material particle diameter (D50) obtained after mixing the high-efficiency mixture was 55 μm;
[0045](2) The mixed material was raised to 670 ° C at a rate of 5 ° C / min under a pure nitrogen gas atmosphere for sintering for 8 h, and the airflow was pulverized, and the pulverized particle size (D50) was carried out 0.8 μm;
[0046] (3) The pulverized material was subjected to secondary sintered, raised to 745 ° C at a rate of 8 ° C / min for sintering for 6 h, and the methanol 125 g / kg was introduced, and the lithium iron phosphate positive material is ob...
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