Synthesis method for lithium iron phosphate/carbon composite material
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A technology of carbon composite materials and lithium iron phosphate, applied in electrical components, battery electrodes, circuits, etc., can solve the problem of low electron mobility of lithium iron phosphate, achieve high current and excellent cycle performance, high specific capacity, and simple process Feasible effect
Active Publication Date: 2012-01-25
ZHEJIANG UNIV OF TECH
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However, since lithium phosphate is a poor conductor of electricity, if excessive lithium phosphate is added, the electron mobility of lithium iron phosphate, which is inherently insufficient in conductivity, will be lower.
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Embodiment 1
[0028] Weigh 3.48gLi 3 PO 4 0.5H 2 O, 1.68g reduced iron powder, 9.33g FePO 4 4H 2 O, 0.2g lithium carbonate, 2.7g citric acid, mix well. Put it into a ball mill container and mill it for 3 hours, then put it in nitrogen and bake it at 750°C for 15 hours to get LiFePO with uniform particles. 4 / C powder.
[0029] X-ray diffraction was done on the prepared lithium iron phosphate / carbon, by figure 1 It can be seen that the prepared lithium iron phosphate has an olivine-type orthorhombic pure phase structure, and there are no peaks of other impurities in the spectrum. figure 2 is LiFePO 4 / C powder magnified 10,000 times scanning electron microscope photo, it can be seen from the figure that the particle size of the product is about 1 micron.
[0030] The active material LiFePO 4 / C powder, acetylene black, and polyvinylidene fluoride in a mass ratio of 8:1:1, weigh a total of 0.5g, dissolve it in an appropriate amount of 1-methyl-2-pyrrolidone, mix it evenly, and apply...
Embodiment 2
[0033] Weigh 3.48gLi 3 PO 4 0.5H 2 O, 1.68g reduced iron powder, 9.33g FePO 4 4H 2 O, 0.17g lithium carbonate, 2.7g citric acid, mix well. Put it into a ball mill container and mill it for 3 hours, then put it in nitrogen and bake it at 750°C for 15 hours to get LiFePO with uniform particles. 4 / C powder.
Embodiment 3
[0035] Weigh 3.48gLi 3 PO 4 0.5H 2 O, 1.68g reduced iron powder, 9.33g FePO 4 4H 2 O, 0.27g lithium carbonate, 2.7g citric acid, mix well. Put it into a ball mill container and mill it for 3 hours, then put it in nitrogen and bake it at 750°C for 15 hours to get LiFePO with uniform particles. 4 / C powder.
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Abstract
The invention discloses a synthesis method for a lithium iron phosphate/carbon composite material. The synthesis method is characterized by comprising the following steps of: (1) uniformly mixing lithium phosphate, iron powder, iron phosphate, another lithium source and a carbonous conductive agent precursor, wherein the another lithium source is one or the combination of any of the following components: lithium carbonate, lithium oxalate, lithium acetate, lithium hydroxide and lithium nitrate, and the carbonous conductive agent precursor is one or the combination of any of the following components: glucose, sucrose, citric acid, starch, polyvinyl alcohol, stearic acid and lauric acid; (2) putting the raw material mixture obtained in the step (1) into a ball-milling container and performing full ball milling; and (3) putting the mixture subjected to the ball milling into nitrogen gas and baking the mixture at 600-800 DEG C to prepare the lithium iron phosphate/carbon composite material. The synthesis method is simple in process, and the synthesized lithium iron phosphate/carbon composite material is high in specific capacity and excellent in high-current and cycle performance.
Description
Technical field: [0001] The invention relates to a synthesis method of lithium iron phosphate / carbon composite material, which can be used as positive electrode material of lithium ion battery. Background technique: [0002] Since A.K.Padhi et al. reported in 1997 that lithium iron phosphate with an olivine structure can be used as a cathode material for lithium-ion batteries, due to its excellent electrochemical performance, abundant raw material sources, and good safety performance, it can be used in high-temperature environments. Use and other characteristics are favored by the majority of scientific research institutions and commercial companies. [0003] At present, the preparation methods of lithium iron phosphate mainly include high-temperature solid-phase method, microwave synthesis method, sol-gel method, liquid phase deposition method, etc. The high-temperature solid-phase method has a simple process and is suitable for large-scale production, but the reactants ar...
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