Lithium iron phosphate composite material coated with ternary carbon source and preparation method of material
A technology of lithium iron phosphate and composite materials, which is applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of low conductivity, low lithium ion diffusion coefficient and low tap density of lithium iron phosphate materials. , to achieve the effect of shortening the molecular reorganization process, solving the problem of easy reunion and difficult reunion
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Embodiment 1
[0056] The preparation of embodiment 1 graphene oxide
[0057] 1) Under the condition of ice-water bath (0° C.), mix 2 g of graphite and 2 g of sodium nitrate, and slowly add 100 ml of 98% concentrated sulfuric acid while stirring. After fully stirring for 1 h, slowly add 10 g of potassium permanganate, and add 5 times, 2 g each time. After adding potassium permanganate, fully react for 1h.
[0058] 2) Raise the temperature to 35° C., and react for 2 hours under continuous stirring to obtain a black viscous slurry A.
[0059] 3) Slowly add 160ml of deionized water dropwise into the black viscous slurry A under constant stirring and rapid stirring, and reddish-brown gas overflows, so ensure that the experiment is carried out in a fume hood. After the reaction is complete, 150 ml of deionized water is added therein to dilute the acidity of the solution to obtain a khaki-yellow slurry B.
[0060] 4) Heat the khaki slurry B to 95°C, slowly add 120ml of H while stirring 2 o 2(...
Embodiment 2
[0063] The preparation of embodiment 2 graphene oxide
[0064] 1) Under the condition of ice-water bath (0° C.), mix 5 g of graphite and 5 g of sodium nitrate, and slowly add 250 ml of 98% concentrated sulfuric acid while stirring. After fully stirring for 1 h, slowly add 30 g of potassium permanganate, and add 15 times, 2 g each time. After adding potassium permanganate, fully react for 2.5h.
[0065] 2) Raise the temperature to 35° C., and react for 5 hours under constant stirring to obtain a black viscous slurry A.
[0066] 3) Slowly add 400ml of deionized water dropwise to the black viscous slurry A under continuous rapid stirring, and reddish-brown gas overflows, so ensure that the experiment is carried out in a fume hood. After the reaction is complete, 500 ml of deionized water is added therein to dilute the acidity of the solution to obtain a khaki-yellow slurry B.
[0067] 4) Heat the khaki slurry B to 95°C, slowly add 300ml of H while stirring 2 o 2 (mass fracti...
Embodiment 3 3
[0070] Example 3 Preparation of lithium iron phosphate composite material coated with ternary carbon source
[0071] Step 1. Homogenization of precursor slurry:
[0072] According to the molar ratio of stoichiometric ratio Fe, P, Li is 1: 1: 1, take by weighing iron phosphate, lithium hydroxide, take by weighing 1.5 grams of graphene according to every mole of iron source, take by weighing 9 grams of starch according to every mole of iron source, Take 7 grams of thermosetting phenolic resin (model PF-2426) according to every mole of iron source, and the weight content of carbon in the lithium iron phosphate composite material coated by the final ternary carbon source is 6%;
[0073] Ultrasonically disperse graphene in water until the peeling is complete to obtain graphene slurry, then disperse iron phosphate in the above graphene slurry, ball mill the slurry, then dissolve lithium hydroxide, starch in water, and PF-2426 in ethanol, and then sequentially added to the above-men...
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