Method for in-situ synthesis of carbon-coated lithium iron phosphate by microwave solvothermal
A carbon-coated lithium iron phosphate and microwave solvothermal technology, which is applied to electrical components, battery electrodes, circuits, etc., can solve the problems of easy agglomeration of lithium iron phosphate powder, difficulty in obtaining uniform size, long reaction cycle, etc., and achieve improved Effect of electrochemical performance, ensuring uniformity, and short reaction cycle
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Embodiment 1
[0039] 0.01mol LiAc 2H 2 O and 0.01mol Fe(NO 3 ) 3 ·9H 2 O was dispersed in 70 mL of diethylene glycol, and after stirring evenly, 0.01 mol H was slowly added 3 PO 4 , and kept stirring, then 3 mL of ethylenediamine was added dropwise, and the precursor solution was obtained by stirring evenly. Take 40 mL of the precursor solution and put it into a 100 mL microwave reactor, react at 220 °C for 1 h, cool down to room temperature, wash the reaction solution with deionized water and ethanol for many times, and then dry it in a 100 °C oven to obtain the precursor. The precursor was placed in a reducing atmosphere (5vol.%H 2 and 95vol.% Ar) was heated to 700°C and calcined for 10h. Naturally cooled to room temperature with the furnace to obtain a carbon-coated three-dimensional bicontinuous structure LiFePO 4 / C.
[0040] The carbon-coated lithium iron phosphate prepared by the above method is subjected to powder X-ray diffraction, and its collection of illustrative plates ...
Embodiment 2
[0042] 0.005mol LiAc 2H 2 O and 0.005mol Fe(NO 3 )3 ·9H 2 O was dispersed in 70 mL of diethylene glycol, and after stirring evenly, 0.005 mol H was slowly added 3 PO 4 , and kept stirring, then 3 mL of ethylenediamine was added dropwise, and the precursor solution was obtained by stirring evenly. Take 35 mL of the precursor solution and put it into a 100 mL microwave reactor, react at 220 °C for 1 h, cool to room temperature, wash the reaction solution with deionized water and ethanol for many times, and then dry it in a 100 °C oven to obtain the precursor. The precursor was placed in a reducing atmosphere (5vol.%H 2 and 95vol.% Ar) was heated to 700°C and calcined for 10h. Naturally cooled to room temperature with the furnace to obtain a carbon-coated three-dimensional bicontinuous structure LiFePO 4 / C.
[0043] The scanning electron microscope (SEM) images of the as-prepared precursor (a) and the calcined product lithium iron phosphate (b) are as follows Figure 4 s...
Embodiment 3
[0045] 0.005mol LiAc 2H 2 O and 0.005mol Fe(NO 3 ) 3 ·9H 2 O was dispersed in 70 mL of diethylene glycol, and after stirring evenly, 0.005 mol H was slowly added 3 PO 4 , and kept stirring, then 3 mL of ethylenediamine was added dropwise, and the precursor solution was obtained by stirring evenly. Take 50 mL of the precursor solution and put it into a 100 mL microwave reactor, react at 220 °C for 20 min, cool down to room temperature, wash the reaction solution with deionized water and ethanol for many times, and then dry it in a 100 °C oven to obtain the precursor. The precursor was placed in a reducing atmosphere (5vol.%H 2 and 95vol.% Ar) was heated to 700°C and calcined for 10h. Naturally cooled to room temperature with the furnace to obtain a carbon-coated three-dimensional bicontinuous structure LiFePO 4 / C.
[0046] The scanning electron microscope (SEM) image of the as-prepared precursor is shown as Figure 5 shown. It can be seen from the figure that the pre...
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