Preparation of lithium ionic cell positive pole material lithium ferrous phosphate/carbon composite

[0028] After mixing ferric oxyhydroxide (a mixture of α-FeOOH, β-FeOOH, γ-FeOOH) and lithium dihydrogen phosphate according to Li:Fe:P molar ratio 1.05:1:1, add anhydrous glucose 50% (relatively In the mass fraction of lithium ferrous phosphate), add an appropriate amount of acetone to disperse, ball mill at a speed of 200r / min for 10 hours, and after drying, carry out a temperature program in a nitrogen atmosphere, rising to 550°C at a rate of 5°C / min, and keeping it for 2h. Cool naturally to obtain lithium iron phosphate / carbon composite material.

[0030] Ferric oxyhydroxide (a mixture of α-FeOOH and γ-FeOOH) and lithium dihydrogen phosphate are directly mixed according to the molar Li:Fe:P ratio of 0.9:1:1, and then 25% of starch (relative to that of lithium iron phosphate) is added. mass fraction) and add an appropriate amount of ethanol to disperse, ball mill at a speed of 150r / min for 24 hours, after drying, carry out a temperature program in an argon atmosphere, raise the temperature to 650°C at 5°C / min, keep it warm for 24h, and cool naturally to obtain phosphoric acid Lithium Ferrous / Carbon Composite.

[0032] Lithium chloride, ferric oxyhydroxide (a mixture of α-FeOOH and β-FeOOH), and ammonium monohydrogen phosphate are directly mixed according to the Li:Fe:P molar ratio of 1:1:1, and then 10% sucrose (relative to phosphoric acid mass fraction of lithium ferrous) and an appropriate amount of acetone, after ball milling at a speed of 300r / min for 20 hours, after drying, the temperature was programmed in a nitrogen atmosphere, raised to 700°C at 5°C / min, kept for 20h, and naturally cooled to obtain Lithium iron phosphate / carbon composite.