CN103078115A - Preparation method of carbon-coated porous nano lithium iron phosphate material and lithium ion battery taking material as anode material - Google Patents
Preparation method of carbon-coated porous nano lithium iron phosphate material and lithium ion battery taking material as anode material Download PDFInfo
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Abstract
The invention relates to a preparation method of a carbon-coated porous nano lithium iron phosphate material and a lithium ion battery taking the material as an anode material. The problems that the existing lithium iron phosphate material is poor in conductivity and poor in mass production uniformity, and a performance is poor when a lithium ion battery taking the material as an anode material conducts high multiplying power charging and discharging are solved. The method comprises the steps of 1, weighing; 2, dispersing; 3, preparing a precursor; 4, preparing an intermediate product; 5, preparing a secondary intermediate product; 6, calcining the products; and 7, obtaining the carbon-coated porous nano lithium iron phosphate material. The lithium ion battery taking the material as the anode material consists of an anode plate, a cathode plate, a separation film and an aluminum plastic composite film. The conductivity of the lithium iron phosphate material prepared with the method is improved; the product uniformity is good; and the lithium ion battery taking the material as the anode material is good in performance.
Description
Technical field
The present invention relates to the preparation method of LiFePO 4 material and the lithium ion battery take this material as positive electrode.
Background technology
Ferric phosphate lithium cell has the raw material wide material sources, and fail safe is good, has extended cycle life, and advantages of environment protection is the ideal source system that drives electric automobile.But present ferric phosphate lithium cell is at the high rate charge-discharge aspect of performance, also is difficult to satisfy pure electric vehicle and plug-in hybrid electric vehicle to the requirement of quickly charging battery; And the consistency of its batch production is poor, cause the single capacity of lithium ion battery heterogeneity take it as positive electrode, so that battery set management is difficult, cause the single lithium ion battery of part to overcharge or the problem such as overdischarge, bring potential safety hazard, above 2 development that restrict ev industry.
Summary of the invention
The present invention is that will to solve existing conductivity of lithium iron phosphate material poor, its batch production consistency is poor, and the problem of poor performance during the lithium ion battery high rate charge-discharge take it as positive electrode, and the preparation method of the coated porous structure nano LiFePO 4 material of carbon and the lithium ion battery take this material as positive electrode are provided.
The preparation method of the coated porous structure nano LiFePO 4 material of carbon prepares according to following steps:
One, the ratio according to the amount of substance of Fe, P and Li is that 1:1:0.9～1.1 take by weighing trivalent iron salt, P source compound and Li source compound, is 1～11:20 according to the mass ratio of organic molecule carbon source and trivalent iron salt, takes by weighing the organic molecule carbon source;
Two, the trivalent iron salt that step 1 is taken by weighing, P source compound, Li source compound and organic molecule carbon source mix, and obtain mixture, then add deionized water in mixture, stir 2h～4h, obtain dispersion liquid, wherein, the deionized water quality is 5～10 times of mixture quality;
Three, the dispersion liquid that step 2 is obtained is under 50 ℃～100 ℃ conditions in temperature, stir 6h～7h, the control mixing speed is 200r/min～220r/min, obtain the rheological body compound, then be to be dried to constant weight under 80 ℃～90 ℃ conditions with the rheological body compound in temperature, make composite precursor;
Four, then the composite precursor grind into powder that step 3 is obtained gets intermediate product with powder predecomposition in special atmosphere oven, and control predecomposition temperature is 200 ℃～300 ℃, and the predecomposition time is 1h～4h;
Five, it is 300r/min～3000r/min at rotating speed that the intermediate product that step 4 is obtained is put into ball grinder, and temperature is under 50 ℃～200 ℃ conditions, keeps 0.5h～10h, is cooled to room temperature again, obtains the secondary intermediate product, and wherein ratio of grinding media to material is 100～10:1;
Six, the secondary intermediate product that step 5 is obtained is calcined in special atmosphere oven, then is cooled to room temperature and obtains calcined product, and wherein, calcining heat is 550 ℃～750 ℃, and calcination time is 5h～12h;
Seven, the calcined product that step 6 is obtained is pulverized, and adopts 390 orders～400 purpose sieve again, and the powder that obtains is the coated porous structure nano LiFePO 4 material of carbon.
Lithium ion battery take the coated porous structure nano LiFePO 4 material of carbon as positive electrode is by positive plate, negative plate, barrier film and aluminum-plastic composite membrane form, described barrier film is between positive plate and negative plate, aluminum-plastic composite membrane is wrapped in positive plate, the periphery of negative plate and barrier film, wherein, positive plate is made by plus plate current-collecting body and anode sizing agent, described anode sizing agent is by mass percentage by the coated porous structure nano LiFePO 4 material of 80%～95% carbon, 2%～10% conductive agent and 3%～10% binding agent Kynoar form, anode sizing agent is evenly distributed on the surface of plus plate current-collecting body, plus plate current-collecting body is aluminium foil, and the coated face density of anode sizing agent in the anode collection surface is 50g/m
2～200g/m
2Negative plate is made by negative current collector and cathode size, cathode size is for being comprised of the active carbon of 75%～96% graphite type material, 1%～15% high-specific surface area and 3%～10% binding agent Kynoar by mass percentage, cathode size is evenly distributed on the surface of negative current collector, negative current collector is Copper Foil, and the coated face density of cathode size in the negative pole currect collecting surface is 20～100g/m
2, graphite type material is the one or more combination in native graphite, Delanium and the carbonaceous mesophase spherules.
The invention has the beneficial effects as follows:
The high speed ball milling solvent heat that the present invention adopts provides good liquid-phase reaction condition for solid powder particle, and solids contact with liquid flux closely it is heated evenly, and heat exchange is good, is not easy to occur the local overheating phenomenon; Being sealed in simultaneously suspension-turbid liquid in the cylinder body has avoided and the contacting of oxygen.Compare with other commonly used synthetic methods, the method has that synthesis temperature is lower, and roasting time is short, and the advantage of the little and distribution homogeneous of resulting materials particle is so that the consistency of the LiFePO 4 material that final sintering goes out is excellent.
The high speed ball milling hot solvent method that the present invention adopts has sol-gal process concurrently, the advantage of carbothermic method and ball grinding technique, can prepare the less primary granule of particle under relatively low temperature and in the shorter time and be and be nano particle, guarantee even size distribution, and the material of high conformity.
LiFePO4 is nanometer particle size (being lower than 100nm) in the coated porous structure nano LiFePO 4 material of carbon of the present invention's preparation.This special construction is mainly reflected in the positive role of improving the material high rate performance: 1, the bigger serface of nano-grade lithium iron phosphate particle has increased and the contacting of electrolysis liquid phase, it is conducive to lithium ion and embeds from lithium iron phosphate particles surface fast and deviate from, greatly increase so that participate in the surface area of electrochemical reaction, thereby significantly reduced the interface current density in the electrochemical reaction process, reduced the electrochemical reaction polarization; 2, the nano-grade lithium iron phosphate particle has shortened ion diffusion path so that lithium ion is more smooth and easy in the diffusion of b axle, reduces the ion diffusional resistance, has improved large current ratio performance.
The loose structure of the coated porous structure nano LiFePO 4 material of carbon of the present invention's preparation is mainly reflected in the positive role of improving the material high rate performance: 1, loose structure is conducive to infiltration and the therein fast turnover of lithium ion of electrolyte, electrolyte directly touches the lithium iron phosphate particles surface, and lithium ion embeds or deviates from electrochemical reaction; 2, porous carbon coating layer structure has not only strengthened the electron conduction of material, reduce ohmic polarization, and restricted material granule and in sintering process, grow, guaranteed the generation of nano-grade lithium iron phosphate particle, shorten lithium ion diffusion path, reduced the ion diffusional resistance.
Lithium ion battery take the coated porous structure nano LiFePO 4 material of carbon of invention preparation as positive electrode, have following performance: (1) is the high rate charge-discharge cycle performance preferably: under the 10C charge-discharge magnification, after 500 circulations, the capability retention of lithium ion battery still is higher than 90%; (2) discharge specific discharge capacity: 1C discharge〉135mAhg
-1, the 5C discharge〉and 110mAhg
-1, the 10C discharge〉and 95mAhg
-1, the 20C discharge〉and 70mAhg
-1, wherein, the discharge specific discharge capacity refers to the specific discharge capacity of (referring to the coated porous structure nano LiFePO 4 material of carbon) of active material on the electrode.
The present invention is for the preparation of the coated porous structure nano LiFePO 4 material of carbon and the lithium ion battery take this material as positive electrode.
Description of drawings
Fig. 1 is the scanning electron microscope (SEM) photograph of the coated porous structure nano LiFePO 4 material of carbon of embodiment one preparation; Fig. 2 is the charging and discharging curve figure of lithium ion battery under the 0.2C charge-discharge magnification that the coated porous structure nano LiFePO 4 material of carbon of embodiment one preparation is positive electrode, and wherein curve 1 is charging curve, and curve 2 is discharge curves; Fig. 3 is the different multiplying performance chart of the coated porous structure nano LiFePO 4 material of carbon of the present embodiment one preparation lithium ion battery that is positive electrode, wherein, curve platform 1 is the electrochemistry capacitance under the room temperature 0.2C multiplying power, curve platform 2 is the electrochemistry capacitance under the room temperature 1C multiplying power, curve platform 3 room temperatures are the electrochemistry capacitance under the 5C multiplying power, curve platform 4 is the electrochemistry capacitance under the room temperature 10C multiplying power, curve platform 5 is the electrochemistry capacitance under the room temperature 20C multiplying power, and curve platform 6 is for recovering the electrochemistry capacitance under the initial room-temperature 0.2C multiplying power; Fig. 4 is 500 the cycle performance curve charts of lithium ion battery under the 10C charge-discharge magnification take the coated porous structure nano LiFePO 4 material of carbon of embodiment one preparation as positive electrode.
Embodiment
Technical solution of the present invention is not limited to following cited embodiment, also comprises the combination in any between each embodiment.
Embodiment one: the preparation method of the coated porous structure nano LiFePO 4 material of present embodiment carbon prepares according to following steps:
One, the ratio according to the amount of substance of Fe, P and Li is that 1:1:0.9～1.1 take by weighing trivalent iron salt, P source compound and Li source compound, is 1～11:20 according to the mass ratio of organic molecule carbon source and trivalent iron salt, takes by weighing the organic molecule carbon source;
Two, the trivalent iron salt that step 1 is taken by weighing, P source compound, Li source compound and organic molecule carbon source mix, and obtain mixture, then add deionized water in mixture, stir 2h～4h, obtain dispersion liquid, wherein, the deionized water quality is 5～10 times of mixture quality;
Three, the dispersion liquid that step 2 is obtained is under 50 ℃～100 ℃ conditions in temperature, stir 6h～7h, the control mixing speed is 200r/min～220r/min, obtain the rheological body compound, then be to be dried to constant weight under 80 ℃～90 ℃ conditions with the rheological body compound in temperature, make composite precursor;
Four, then the composite precursor grind into powder that step 3 is obtained gets intermediate product with powder predecomposition in special atmosphere oven, and control predecomposition temperature is 200 ℃～300 ℃, and the predecomposition time is 1h～4h;
Five, it is 300r/min～3000r/min at rotating speed that the intermediate product that step 4 is obtained is put into ball grinder, and temperature is under 50 ℃～200 ℃ conditions, keeps 0.5h～10h, is cooled to room temperature again, obtains the secondary intermediate product, and wherein ratio of grinding media to material is 100～10:1;
Six, the secondary intermediate product that step 5 is obtained is calcined in special atmosphere oven, then is cooled to room temperature and obtains calcined product, and wherein, calcining heat is 550 ℃～750 ℃, and calcination time is 5h～12h;
Seven, the calcined product that step 6 is obtained is pulverized, and adopts 390 orders～400 purpose sieve again, and the powder that obtains is the coated porous structure nano LiFePO 4 material of carbon.
The high speed ball milling solvent heat that present embodiment adopts provides good liquid-phase reaction condition for solid powder particle, and solids contact with liquid flux closely it is heated evenly, and heat exchange is good, is not easy to occur the local overheating phenomenon; Being sealed in simultaneously suspension-turbid liquid in the cylinder body has avoided and the contacting of oxygen.Compare with other commonly used synthetic methods, the method has that synthesis temperature is lower, and roasting time is short, and the advantage of the little and distribution homogeneous of resulting materials particle is so that the consistency of the LiFePO 4 material that final sintering goes out is excellent.
The high speed ball milling hot solvent method that present embodiment adopts has sol-gal process concurrently, the advantage of carbothermic method and ball grinding technique, can prepare under relatively low temperature and in the shorter time that particle is less, primary granule is and is nano particle, guarantee even size distribution, and the material of high conformity.
LiFePO4 is nanometer particle size (being lower than 100nm) in the coated porous structure nano LiFePO 4 material of carbon of present embodiment preparation.This special construction is mainly reflected in the positive role of improving the material high rate performance: 1, the bigger serface of nano-grade lithium iron phosphate particle has increased and the contacting of electrolysis liquid phase, it is conducive to lithium ion and embeds from lithium iron phosphate particles surface fast and deviate from, greatly increase so that participate in the surface area of electrochemical reaction, thereby significantly reduced the interface current density in the electrochemical reaction process, reduced the electrochemical reaction polarization; 2, the nano-grade lithium iron phosphate particle has shortened ion diffusion path so that lithium ion is more smooth and easy in the diffusion of b axle, reduces the ion diffusional resistance, has improved large current ratio performance.
The loose structure of the coated porous structure nano LiFePO 4 material of carbon of present embodiment preparation is mainly reflected in the positive role of improving the material high rate performance: 1, loose structure is conducive to infiltration and the therein fast turnover of lithium ion of electrolyte, electrolyte directly touches the lithium iron phosphate particles surface, and lithium ion embeds or deviates from electrochemical reaction; 2, porous carbon coating layer structure has not only strengthened the electron conduction of material, reduce ohmic polarization, and restricted material granule and in sintering process, grow, guaranteed the generation of nano-grade lithium iron phosphate particle, shorten lithium ion diffusion path, reduced the ion diffusional resistance.
Embodiment two: what present embodiment and embodiment one were different is: trivalent iron salt is ferric nitrate in the step 1.Other is identical with embodiment one.
Embodiment three: what present embodiment was different from embodiment one or two is: P source compound is ammonium dihydrogen phosphate or ammonium hydrogen phosphate in the step 1.Other is identical with embodiment one or two.
Embodiment four: what present embodiment was different from one of embodiment one to three is: Li source compound is a kind of or wherein several combinations in lithium nitrate, lithium carbonate and the lithium hydroxide in the step 1.Other is identical with one of embodiment one to three.
Embodiment five: what present embodiment was different from one of embodiment one to four is: the organic molecule carbon source be sucrose with glucose is mixture, sucrose or the glucose of 1:2～4 by the ratio of amount of substance in the step 1.Other is identical with one of embodiment one to four.
Embodiment six: what present embodiment was different from one of embodiment one to five is: the predecomposition temperature is 260 ℃～270 ℃ in the step 4, and the predecomposition time is 2h.Other is identical with one of embodiment one to five.
Embodiment seven: what present embodiment was different from one of embodiment one to six is: the rotating speed of ball grinder is 1000r/min～1500r/min in the step 5.Other is identical with one of embodiment one to six.
Embodiment eight: what present embodiment was different from one of embodiment one to seven is: be under 60 ℃～100 ℃ conditions in temperature in the step 5, keep 0.6h～1h.Other is identical with one of embodiment one to seven.
Embodiment nine: what present embodiment was different from one of embodiment one to eight is: calcining heat is 650 ℃～660 ℃ in the step 6, and calcination time is 9h.Other is identical with one of embodiment one to eight.
Embodiment ten: what present embodiment was different from one of embodiment one to nine is: the lithium ion battery take the coated porous structure nano LiFePO 4 material of carbon as positive electrode is by positive plate, negative plate, barrier film and aluminum-plastic composite membrane form, described barrier film is between positive plate and negative plate, aluminum-plastic composite membrane is wrapped in positive plate, the periphery of negative plate and barrier film, wherein, positive plate is made by plus plate current-collecting body and anode sizing agent, described anode sizing agent is by mass percentage by the coated porous structure nano LiFePO 4 material of 80%～95% carbon, 2%～10% conductive agent and 3%～10% binding agent Kynoar form, anode sizing agent is evenly distributed on the surface of plus plate current-collecting body, plus plate current-collecting body is aluminium foil, and the coated face density of anode sizing agent in the anode collection surface is 50g/m
2～200g/m
2Negative plate is made by negative current collector and cathode size, cathode size is for being comprised of the active carbon of 75%～96% graphite type material, 1%～15% high-specific surface area and 3%～10% binding agent Kynoar by mass percentage, cathode size is evenly distributed on the surface of negative current collector, negative current collector is Copper Foil, and the coated face density of cathode size in the negative pole currect collecting surface is 20～100g/m
2, graphite type material is the one or more combination in native graphite, Delanium and the carbonaceous mesophase spherules.Other is identical with one of embodiment one to nine.
Wherein, graphite type material is in native graphite, Delanium and the carbonaceous mesophase spherules during several combination, in any proportion combination.
Adopt following examples to verify beneficial effect of the present invention:
Embodiment one:
The preparation method of the coated porous structure nano LiFePO 4 material of the present embodiment carbon prepares according to following steps:
One, the ratio according to the amount of substance of Fe, P and Li is that 1:1:1.05 takes by weighing trivalent iron salt, P source compound and Li source compound, is 7:20 according to the mass ratio of organic molecule carbon source and trivalent iron salt, takes by weighing the organic molecule carbon source;
Two, the trivalent iron salt that step 1 is taken by weighing, P source compound, Li source compound and organic molecule carbon source mix, and obtain mixture, then add deionized water in mixture, stir 3h, obtain dispersion liquid, wherein, the deionized water quality is 8 times of mixture quality;
Three, the dispersion liquid that step 2 is obtained is under 80 ℃ of conditions in temperature, stirs 6h, and the control mixing speed is 200r/min, obtains the rheological body compound, is to be dried to constant weight under 80 ℃ of conditions with the rheological body compound in temperature then, makes composite precursor;
Four, then the composite precursor grind into powder that step 3 is obtained gets intermediate product with powder predecomposition in special atmosphere oven, and control predecomposition temperature is 260 ℃, and the predecomposition time is 2h;
Five, it is 1500r/min at rotating speed that the intermediate product that step 4 is obtained is put into ball grinder, and temperature is under 60 ℃ of conditions, keeps 0.5h, is cooled to room temperature again, obtains the secondary intermediate product, and wherein ratio of grinding media to material is 80:1;
Six, the secondary intermediate product that step 5 is obtained is calcined in special atmosphere oven, then is cooled to room temperature and obtains calcined product, and wherein, calcining heat is 650 ℃, and calcination time is 9h;
Seven, the calcined product that step 6 is obtained is pulverized, and adopts 400 purpose sieve again, and the powder that obtains is the coated porous structure nano LiFePO 4 material of carbon.
Lithium ion battery take the coated porous structure nano LiFePO 4 material of carbon of the present embodiment preparation as positive electrode is by positive plate, negative plate, barrier film and aluminum-plastic composite membrane form, described barrier film is between positive plate and negative plate, aluminum-plastic composite membrane is wrapped in positive plate, the periphery of negative plate and barrier film, wherein, positive plate is made by plus plate current-collecting body and anode sizing agent, described anode sizing agent is by mass percentage by the coated porous structure nano LiFePO 4 material of 80% carbon, 10% conductive agent and 10% binding agent Kynoar form, anode sizing agent is evenly distributed on the surface of plus plate current-collecting body, plus plate current-collecting body is aluminium foil, and the coated face density of anode sizing agent in the anode collection surface is 100g/m
2Negative plate is made by negative current collector and cathode size, cathode size is for being comprised of the active carbon of 80% graphite type material, 10% high-specific surface area and 10% binding agent Kynoar by mass percentage, cathode size is evenly distributed on the surface of negative current collector, negative current collector is Copper Foil, and the coated face density of cathode size in the negative pole currect collecting surface is 50g/m
2, graphite type material is carbonaceous mesophase spherules.
The scanning electron microscope (SEM) photograph of the coated porous structure nano LiFePO 4 material of carbon of the present embodiment preparation as shown in Figure 1; The charging and discharging curve figure of lithium ion battery under the 0.2C charge-discharge magnification take the coated porous structure nano LiFePO 4 material of carbon of the present embodiment preparation as positive electrode as shown in Figure 2, wherein curve 1 is charging curve, curve 2 is discharge curves; Different multiplying performance chart take the coated porous structure nano LiFePO 4 material of carbon of the present embodiment preparation as the lithium ion battery of positive electrode as shown in Figure 3, wherein curve platform 1 is the electrochemistry capacitance under the room temperature 0.2C multiplying power, curve platform 2 is the electrochemistry capacitance under the room temperature 1C multiplying power, curve platform 3 room temperatures are the electrochemistry capacitance under the 5C multiplying power, curve platform 4 is the electrochemistry capacitance under the room temperature 10C multiplying power, curve platform 5 is the electrochemistry capacitance under the room temperature 20C multiplying power, and curve platform 6 is for recovering the electrochemistry capacitance under the initial room-temperature 0.2C multiplying power; 500 the cycle performance curve charts of lithium ion battery under the 10C charge-discharge magnification take the coated porous structure nano LiFePO 4 material of carbon of the present embodiment preparation as positive electrode as shown in Figure 4.
Lithium ion battery take the coated porous structure nano LiFePO 4 material of carbon of the present embodiment preparation as positive electrode, have following performance: (1) is the high rate charge-discharge cycle performance preferably: under the 10C charge-discharge magnification, after 500 circulations, the capability retention of lithium ion battery still is higher than 90%; (2) discharge specific discharge capacity: 1C discharge〉135mAhg
-1, the 5C discharge〉and 110mAhg
-1, the 10C discharge〉and 95mAhg
-1, the 20C discharge〉and 70mAhg
-1, wherein, the discharge specific discharge capacity refers to the specific discharge capacity of (referring to the coated porous structure nano LiFePO 4 material of carbon) of active material on the electrode.
Claims (10)
1. the preparation method of the coated porous structure nano LiFePO 4 material of carbon is characterized in that preparing the preparation method of the coated porous structure nano LiFePO 4 material of carbon according to following steps:
One, the ratio according to the amount of substance of Fe, P and Li is that 1:1:0.9～1.1 take by weighing trivalent iron salt, P source compound and Li source compound, is 1～11:20 according to the mass ratio of organic molecule carbon source and trivalent iron salt, takes by weighing the organic molecule carbon source;
Two, the trivalent iron salt that step 1 is taken by weighing, P source compound, Li source compound and organic molecule carbon source mix, and obtain mixture, then add deionized water in mixture, stir 2h～4h, obtain dispersion liquid, wherein, the deionized water quality is 5～10 times of mixture quality;
Three, the dispersion liquid that step 2 is obtained is under 50 ℃～100 ℃ conditions in temperature, stir 6h～7h, the control mixing speed is 200r/min～220r/min, obtain the rheological body compound, then be to be dried to constant weight under 80 ℃～90 ℃ conditions with the rheological body compound in temperature, make composite precursor;
Four, then the composite precursor grind into powder that step 3 is obtained gets intermediate product with powder predecomposition in special atmosphere oven, and control predecomposition temperature is 200 ℃～300 ℃, and the predecomposition time is 1h～4h;
Five, it is 300r/min～3000r/min at rotating speed that the intermediate product that step 4 is obtained is put into ball grinder, and temperature is under 50 ℃～200 ℃ conditions, keeps 0.5h～10h, is cooled to room temperature again, obtains the secondary intermediate product, and wherein ratio of grinding media to material is 100～10:1;
Six, the secondary intermediate product that step 5 is obtained is calcined in special atmosphere oven, then is cooled to room temperature and obtains calcined product, and wherein, calcining heat is 550 ℃～750 ℃, and calcination time is 5h～12h;
Seven, the calcined product that step 6 is obtained is pulverized, and adopts 390 orders～400 purpose sieve again, and the powder that obtains is the coated porous structure nano LiFePO 4 material of carbon.
2. the preparation method of the coated porous structure nano LiFePO 4 material of carbon according to claim 1 is characterized in that trivalent iron salt is ferric nitrate in the step 1.
3. the preparation method of the coated porous structure nano LiFePO 4 material of carbon according to claim 2 is characterized in that P source compound is ammonium dihydrogen phosphate or ammonium hydrogen phosphate in the step 1.
4. the preparation method of the coated porous structure nano LiFePO 4 material of carbon according to claim 3 is characterized in that Li source compound in the step 1 is a kind of or wherein several combinations in lithium nitrate, lithium carbonate and the lithium hydroxide.
5. the preparation method of the coated porous structure nano LiFePO 4 material of carbon according to claim 4 is characterized in that organic molecule carbon source in the step 1 be sucrose with glucose is mixture, sucrose or the glucose of 1:2～4 by the ratio of amount of substance.
6. the preparation method of the coated porous structure nano LiFePO 4 material of carbon according to claim 5 is characterized in that the predecomposition temperature is 260 ℃～270 ℃ in the step 4, and the predecomposition time is 2h.
7. the preparation method of the coated porous structure nano LiFePO 4 material of carbon according to claim 6, the rotating speed that it is characterized in that ball grinder in the step 5 is 1000r/min～1500r/min.
8. the preparation method of the coated porous structure nano LiFePO 4 material of carbon according to claim 7 is characterized in that in the step 5 in temperature being under 60 ℃～100 ℃ conditions, keeps 0.6h～1h.
9. the preparation method of the coated porous structure nano LiFePO 4 material of carbon according to claim 7 is characterized in that calcining heat is 650 ℃～660 ℃ in the step 6, and calcination time is 9h.
10. the lithium ion battery take the coated porous structure nano LiFePO 4 material of carbon of claim 1 preparation as positive electrode, it is characterized in that lithium ion battery take the coated porous structure nano LiFePO 4 material of carbon as positive electrode is by positive plate, negative plate, barrier film and aluminum-plastic composite membrane form, described barrier film is between positive plate and negative plate, aluminum-plastic composite membrane is wrapped in positive plate, the periphery of negative plate and barrier film, wherein, positive plate is made by plus plate current-collecting body and anode sizing agent, described anode sizing agent is by mass percentage by the coated porous structure nano LiFePO 4 material of 80%～95% carbon, 2%～10% conductive agent and 3%～10% binding agent Kynoar form, anode sizing agent is evenly distributed on the surface of plus plate current-collecting body, plus plate current-collecting body is aluminium foil, and the coated face density of anode sizing agent in the anode collection surface is 50g/m
2～200g/m
2Negative plate is made by negative current collector and cathode size, cathode size is for being comprised of the active carbon of 75%～96% graphite type material, 1%～15% high-specific surface area and 3%～10% binding agent Kynoar by mass percentage, cathode size is evenly distributed on the surface of negative current collector, negative current collector is Copper Foil, and the coated face density of cathode size in the negative pole currect collecting surface is 20～100g/m
2, graphite type material is the one or more combination in native graphite, Delanium and the carbonaceous mesophase spherules.
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| CN106374096A (en) * | 2016-11-03 | 2017-02-01 | 江西安驰新能源科技有限公司 | Lithium iron phosphate battery with high energy density |
| CN108110226A (en) * | 2017-11-14 | 2018-06-01 | 欣旺达电子股份有限公司 | Lithium ion battery, anode material for lithium-ion batteries and preparation method thereof |
| CN108172813A (en) * | 2018-02-01 | 2018-06-15 | 广东工业大学 | A kind of composite positive pole and preparation method thereof |
| CN111554914A (en) * | 2020-05-29 | 2020-08-18 | 重庆工商大学 | Lithium iron phosphate-sodium vanadium phosphate-carbon composite material and preparation method and application thereof |
| CN114122333A (en) * | 2021-11-25 | 2022-03-01 | 东南大学 | Nano onion carbon composite lithium iron phosphate cathode material and preparation method and application thereof |
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| CN114122333B (en) * | 2021-11-25 | 2023-11-28 | 东南大学 | Nanometer onion carbon composite lithium iron phosphate positive electrode material, preparation method and application thereof |
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