CN102034980A - Lithium iron phosphate-aluminum-carbon composite cathode material and preparation method thereof - Google Patents

Lithium iron phosphate-aluminum-carbon composite cathode material and preparation method thereof Download PDF

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CN102034980A
CN102034980A CN2010105525830A CN201010552583A CN102034980A CN 102034980 A CN102034980 A CN 102034980A CN 2010105525830 A CN2010105525830 A CN 2010105525830A CN 201010552583 A CN201010552583 A CN 201010552583A CN 102034980 A CN102034980 A CN 102034980A
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iron phosphate
lithium iron
lifepo4
carbon composite
aluminum
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CN102034980B (en
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陈威
王志兴
彭文杰
李旭
袁荣忠
唐朝辉
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BASF Shanshan Battery Materials Co Ltd
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HUNAN SHANSHAN NEW MATERIAL CO Ltd
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Abstract

The invention discloses a lithium iron phosphate-aluminum-carbon composite cathode material and a preparation method thereof. The lithium iron phosphate-aluminum-carbon composite cathode material is prepared by uniformly coating a conductive layer formed by aluminum elementary substance and carbon composite particles on the surface of lithium iron phosphate or lithium iron phosphate lattice doped with a metal ions, wherein the aluminum elementary substance accounts for 0.1 to 10 percent of the weight of the composite material; and the carbon composite particles account for 0.1 to 10 percent of the composite material. In the invention, the coating of the aluminum elementary substance and carbon composite particles effectively improves the conductivity of the lithium iron phosphate material. The lithium iron phosphate-aluminum-carbon composite cathode material has the characteristics of high conductivity, high low-temperature performance, high crystallinity, fine particle size, high comprehensive performance and the like. The method adopts the high-temperature fusion coating of the semi-finished lithium iron phosphate product according to the low fusion point (660.4 DEG C) characteristic of metal aluminum, simplifies a lithium iron phosphate coating process, reduces cost by coating with metal aluminum and carbon, and is suitable for industrial production.

Description

Lithium iron phosphate aluminum carbon composite anode material and preparation method thereof
Technical field
A kind of lithium ion power battery cathode material and preparation method thereof especially relates to a kind of lithium iron phosphate aluminum carbon composite anode material and preparation method thereof.
Background technology
Lithium iron phosphate positive material is one of power battery anode material of at present tool potentiality.But the lithium ion chemical diffusion coefficient and the electronic conductivity of LiFePO4 are too low, have caused the theoretical capacity of material not discharged to greatest extent, thereby have limited the practical application of LiFePO 4 material.In order to improve the conductivity of LiFePO4, at present LiFePO4 is carried out in the method for modification, adopt the method for coated with conductive agent to mainly contain carbon coating, the coating of novel conductive material or metallic cover several method.As the disclosed lithium iron phosphate preparation method of Chinese patent CN101494288A be with carbon source be divided into two the step join in the presoma, and add the micromolecule carbon source earlier, after add organic high molecular polymer carbon source, because organic carbon is difficult to obtain the coating layer of high conduction performance under the not high situation of carburizing temperature, therefore, the carbon of this kind method coating is not best conductive agent; The described LiFePO4 of Chinese patent publication number CN101162776A is to be matrix with the lithium iron phosphate, matrix is coated with carbon nano-material particulate, nano metal or/and the nano-metal-oxide conductive layer forms particulate, the metal that this invention is added, metal oxide all enters into LiFePO4 with ionic species lattice make the part doping metals to play adverse effect to the performance of LiFePO 4 material.It is the LiFePO4 of surperficial clad nano Cu that CN101339988A discloses with the LiFePO4 electrode material, but because anodal current potential height, cause the easy oxidation of nanometer copper that coats, should thereby cause lithium ion and cupric oxide generation embedding lithium to be sent out, material property is had a negative impact, thereby be not suitable for the business-like application of LiFePO4.
Summary of the invention
The object of the present invention is to provide a kind of lithium iron phosphate aluminum carbon composite anode material and preparation method thereof, to realize improving by a relatively large margin the conductivity of LiFePO4, significantly improve the cryogenic property of LiFePO4, and technology is simple, with low cost, be suitable for suitability for industrialized production.
Lithium iron phosphate aluminum carbon composite anode material of the present invention is the conductive layer that the coated with uniform that is doped with the LiFePO4 of metal ion in LiFePO4 or lattice has aluminium simple substance and carbon composite particles to constitute, and described aluminium simple substance accounts for 0.1～10% of composite material percentage by weight; Described carbon composite particles accounts for 0.1～10% of composite material percentage by weight.
The doping of metal ion is 0～5% of Li or a Fe molar fraction in the described LiFePO4 that is doped with metal ion.
Described aluminium simple substance is one or more in nanometer aluminium powder, trickle aluminium powder, high pure spherical aluminium powder, flake aluminum, the aluminum paste; Described carbon composite particles is compound by organic carbon source, and described organic carbon source is one or more in glucose, sucrose, tartaric acid, urea, citric acid, gluconic acid, cellobiose, polyethylene glycol, polyvinyl alcohol, POLYPROPYLENE GLYCOL, soluble starch, phenolic resins, the epoxy resin.
Described metal ion is metal oxide or slaine, and they are in titanium oxide, magnesium oxide, cobalt oxide, aluminium oxide, chromium oxide, manganese dioxide, mangano-manganic oxide, niobium pentaoxide, yittrium oxide, magnesium hydroxide, magnesium carbonate, dolomol, the magnesium dihydrogen phosphate one or more.
Preparation method of the present invention may further comprise the steps:
1) lithium salts, divalent iron salt, microcosmic salt are joined in dispersant or the organic carbon source solvent according to stoichiometric proportion, adopt wet ball grinding 0.5～48 hour to slurry; Wherein the amount of dispersant is to decide according to the slurry viscosity that mixing apparatus requires, and the organic carbon source addition is 0.1～10wt% for the theoretical phosphorus content of final generation LiFePO4;
2) with after the step 1) gained pulp separation, drying is 5～20 hours in drier, obtains moisture content and is less than or equal to 0.5% dried mixture;
3) with step 2) products therefrom, to put into reacting furnace 250～800 ℃ of following constant temperature under inert atmosphere protection and handled 4～30 hours, material is natural cooling in stove, obtains that carbon coats or the LiFePO4 semi-finished product of carbon coated not;
4) the LiFePO4 semi-finished product of step 3) gained are weighed; 0.1～10% the aluminium simple substance that adds the semi-finished product weight fraction; The LiFePO4 semi-finished product of carbon coated are not joined in the organic carbon source solvent, and the organic carbon source addition is 0.1～10wt% for making the theoretical phosphorus content of final generation LiFePO4; Coat semi-finished product for carbon and then join in dispersant or the organic carbon source solvent, wherein the addition of dispersant is decided according to the slurry viscosity that mixing apparatus requires; The organic carbon source addition is 0.1～10wt% for making the theoretical phosphorus content of final generation LiFePO4, and organic carbon source interpolation total amount is no more than making the theoretical phosphorus content of final generation LiFePO4 is 10wt%; Adopt wet ball grinding 0.5～48 hour to slurry;
5) step 4) gained slurry ball material is separated after, moist or in drier, be dried to absolutely dry or leather hard;
6) products therefrom in the step 5) is put into reacting furnace; Under inert atmosphere protection, handled 4～30 hours in 660～900 ℃ of following constant temperature;
7) material natural cooling in stove carries out pulverization process to product, finally obtains the lithium iron phosphate aluminum carbon composite anode material.
0～5% metal oxide or the slaine that comprise Li or Fe molar fraction in the described step (1).
Described dispersant is water, absolute ethyl alcohol or acetone.
Method of the present invention can also realize by the following method: may further comprise the steps:
1) lithium salts, trivalent iron salt, microcosmic salt are joined in the organic carbon source solvent according to stoichiometric proportion, the organic carbon source addition was 0.1～10wt% for making the theoretical phosphorus content of final generation LiFePO4 to the employing wet ball grinding to slurry in 0.5～48 hour;
2) with after the step 1) gained pulp separation, drying is 5～20 hours in drier, obtains moisture content and is less than or equal to 0.5% dried mixture;
3) with step 2) products therefrom, to put into reacting furnace 250～800 ℃ of following constant temperature under inert atmosphere protection and handled 4～30 hours, material is natural cooling in stove, obtains the LiFePO4 semi-finished product that carbon coats;
4) step 3) gained LiFePO4 semi-finished product are weighed, add 0.1～10% aluminium simple substance of semi-finished product weight fraction; Join in dispersant or the organic carbon source solvent, wherein the addition of dispersant is to decide according to the slurry viscosity that mixing apparatus requires, the organic carbon source addition is 0.1～10wt% for making the theoretical phosphorus content of final generation LiFePO4, and twice organic carbon source adds total amount and be no more than that to make the theoretical phosphorus content of final generation LiFePO4 be 10wt%; Adopt wet ball grinding 0.5～48 hour to slurry;
5) with after the step 4) gained pulp separation, moist, or in drier, be dried to absolutely dry or leather hard all can, obtain mixture;
6) with products therefrom in the step 5), to put into reacting furnace 660～900 ℃ of following constant temperature under inert atmosphere protection and handled 4～30 hours, material is natural cooling in stove, and product is carried out pulverization process, finally obtains the lithium iron phosphate aluminum carbon composite anode material.
0～5% metal oxide or the slaine that comprise Li or Fe molar fraction in the described step (1).
The equipment of described wet ball grinding is vertical ball mill, micronizer, wet method mixer, bedroom ball mill, circulating ultra-fine mill, the many ball mills of ultra-fine sand mill, high-speed mixer; Used mill is situated between and is Al 2O 3Ball ZrO 2Ball, agate ball or stainless steel ball, sphere diameter are 0.1～30mm.
Preparation method's of the present invention constant temperature is handled and is adopted tube furnace, push-plate type tunnel cave, bell jar stove, rotary furnace, steel band stove, meshbeltfurnace, vacuum furnace sealed type or gas circulation formula kiln, chamber type electric resistance furnace;
Beneficial effect of the present invention: the present invention utilizes the superior characteristics of electric conductivity under metallic aluminium good conductivity, the low temperature, by the coating of pure aluminum and carbon composite particles, has improved the conductivity of LiFePO 4 material effectively.The LiFePO that is synthesized 4/ Al/C composite positive pole has and conducts electricity very well, and cryogenic property is superior, the material better crystallinity degree, and particle is tiny, characteristics such as good combination property.Preparation method of the present invention is according to the characteristics of metallic aluminium fusing point lower (660.4 ℃), the LiFePO4 semi-finished product are at high temperature carried out fusion to coat, simplified the cladding process of LiFePO4, and it is with low cost to adopt metallic aluminium and carbon to coat, and is suitable for suitability for industrialized production.
Description of drawings
Fig. 1 is the X ray diffracting spectrum of lithium iron phosphate aluminum carbon composite anode material among the embodiment 1;
Fig. 2 is the electron scanning micrograph of embodiment 1 lithium iron phosphate aluminum carbon composite anode material;
Fig. 3 is the discharge curve of embodiment 1 lithium iron phosphate aluminum carbon composite anode material.Its charge-discharge magnification is 0.1C/0.1C and 0.2C/1C, and voltage range is 2.5～4.1V, in 25 ℃ of normal temperature, low temperature-20 ℃ test down.
Embodiment
Embodiment 1:
With 19.85g lithium carbonate (Li 2CO 3), 100g ferric phosphate (FePO 42H 2O), 6.19g phenolic resins joins in the middle of the absolute ethyl alcohol of 130g.Adopted the horizontal ball mill ball milling 1 hour.
After the ball material separates, put into air dry oven dry 6 hours.Get the part dried material and put into tube furnace and carry out sintering, charge into argon gas, at 550 ℃ of following constant temperature 6h.With the stove cooling, be cooled to room temperature then.Obtain the LiFePO4 semi-finished product.Take by weighing weight of material, add the high pure spherical aluminium powder, join in the absolute ethyl alcohol, adopted the horizontal ball mill ball milling 0.5 hour according to 0.5% the amount that takes by weighing weight.Pellet is put into air dry oven and is dried to leather hard after separating.The gained material is put into tube furnace carry out sintering, charge into argon gas, 750 ℃ of following constant temperature 20 hours.Material cools to room temperature with the furnace.The product of coming out of the stove is ground with mortar, and the Dmax of control product is less than 100 μ m.Obtained LiFePO 4/ Al/C composite positive pole.
The material X ray diffracting spectrum that present embodiment obtains as shown in Figure 1, changes the target X-ray diffractometer with Japanese Rigaku D/max2550VB+18kW and carries out material phase analysis, and analysis condition is: CuK α radiation, 40kV, 300mA, go on foot wide 0.02 °, with LiFePO 4Standard diagram (JCPDS No.40-1499) compare, be the LiFePO 4 material of pure phase olivine-type structure.Adopt the Ma Erwen laser particle size analyzer to record this material and be normal distribution, D50 is 2.6 μ m.
The scanning of materials electron micrograph that present embodiment obtains as shown in Figure 2, adopts the surface topography of JSM-5600LV ESEM observation sample under 20kV of JEOL company, and multiplication factor is 5000 times.As can be seen from the figure synthetic material a crystal grain is nanoscale, and size evenly.
The electrochemical property test of material is tested in accordance with the following methods, with LiFePO 4/ Al/C composite material, conductive black and binding agent (PVDF) are pressed mass ratio and are mixed at 8: 1: 1, with the aluminium foil is that matrix is prepared into positive plate, with positive plate and negative plate (lithium sheet), (concentration is the LiPF6/EC+EMC+DMC of 1mol/L to electrolyte, volume ratio is 1: 1: 1) and barrier film (Celgard 2300 PP/PE/PP) in being full of the glove box of argon gas, be assembled into CR2430 type button cell, after battery leaves standstill 10h, test with the Neware-TC52 battery test system, test condition is: carry out 0.1C and discharge and recharge once (cell activation) under normal temperature (25 ℃), 0.1C is full of under normal temperature (25 ℃) then.The battery that will be full of electricity takes off, and is placed in the constant temperature-20 ℃ and leaves standstill 45min; Then, 0.1C multiplying power discharging in-20 ℃ of cryogenic boxes.Button cell is taken out again, leave standstill 45min at normal temperature (25 ℃), carry out 0.2C charging 1C discharge, 0.2C is full of under normal temperature (25 ℃) then.The battery that will be full of electricity takes off, and is placed on constant temperature-20 and ℃ leaves standstill 45min; Then, 1C multiplying power discharging in-20 ℃ of cryogenic boxes.Material specific discharge capacity under normal temperature 0.1C discharge-rate is 148.9mAh/g, and the 0.1C discharge capacity can reach 113mAh/g under the low temperature, and low temperature/normal temperature is 75.9%; Illustrate that this material has good cryogenic property.
Embodiment 2:
With 168g lithium carbonate (Li 2CO 3), 800g ferrous oxalate (FeC 2O 42H 2O), 522g ammonium dihydrogen phosphate (NH 4H 2PO 4), 3.6g magnesium oxide (MgO) joins in the middle of the absolute ethyl alcohol of 900g, adopts the vertical ball mill ball milling 10 hours.After the ball material separates, put into vacuum drying chamber dry 9 hours.Get dried material and put into chamber type electric resistance furnace and carry out sintering, charge into nitrogen, at 450 ℃ of following constant temperature 10h.With the stove cooling, be cooled to room temperature then.Obtain the LiFePO4 semi-finished product.Take by weighing weight of material,, join remaining carbon and be in 3% the D/W, adopted the vertical ball mill ball milling 4 hours according to 1% the amount nanometer aluminium powder that takes by weighing weight.The ball material separates, and putting into vacuum drying chamber, to be dried to material absolutely dry.The gained material is put into chamber type electric resistance furnace carry out sintering, charge into nitrogen, at 800 ℃ of following constant temperature 15h.Material cools to room temperature with the furnace.Adopt horizontal ball mill to pulverize to the product of coming out of the stove, control product granularity has the LiFePO that magnesium ion mixes thereby make 4/ Al/C composite material.
Embodiment 3:
With 1733g lithium dihydrogen phosphate (LiH 2PO 4), 3000g ferrous oxalate (FeC 2O 42H 2O), 13.7g manganese dioxide (MnO 2), the 44g polyvinyl alcohol, join in the water of 3500g, adopt ultra-fine sand mill to mix 28 hours.After the ball material separates, put into air dry oven dry 20 hours.Get dried material and put into rotary furnace and carry out sintering, charge into nitrogen, 650 ℃ of following constant temperature 30 hours.With the stove cooling, be cooled to room temperature then.Obtain the LiFePO4 semi-finished product.Take by weighing weight of material, get, join remaining carbon and be in 1.5% the epoxy resin acetone soln, adopted ultra-fine sand mill ball milling 40 hours according to 5% the trickle aluminium powder of amount that takes by weighing weight.The ball material separates.The gained slurry is put into rotary furnace carry out sintering, charge into nitrogen, at 700 ℃ of following constant temperature 30h.Material cools to room temperature with the furnace.Adopt airslide disintegrating mill to pulverize to the product of coming out of the stove, control product granularity, thus make LiFePO with manganese ion doping 4/ Al/C composite material.
Embodiment 4:
With 600g lithium hydroxide (LiOHH 2O), 2570g ferrous oxalate (FeC 2O 42H 2O), 1886g diammonium hydrogen phosphate ((NH 4) 2HPO 4), joining in the 7Kg deionized water, ball milling is 30 hours in the wet method mixer.After the ball material separates, put into air dry oven dry 12 hours.Get dried material and put in the bell jar stove, adopt the argon gas atmosphere protection, 350 ℃ of following constant temperature 25 hours.Naturally cool to room temperature then, obtain the LiFePO4 semi-finished product.Take by weighing weight of material, get, join the carbon dope amount and be in 8% the citric acid solution, adopted wet method mixer ball milling 37 hours according to 7% the flake aluminum that takes by weighing weight.Obtain slurry and put into air dry oven dry 10 hours.The material that drying is good is put into bell jar stove sintering, adopts the argon gas atmosphere protection, under 780 ℃, and constant temperature 10 hours.Material cools off with stove.Adopt twin rollers to pulverize to the material of coming out of the stove, thereby obtain LiFePO 4/ Al/C composite material.
Embodiment 5:
With 15000g lithium dihydrogen phosphate (LiH 2PO 4), 1730g di-iron trioxide (Fe 2O 3), 288g magnesium hydroxide (Mg (OH) 2), 1730g starch joins in the suitable quantity of water, adopts high-speed mixer to carry out batch mixing, mixed 25 hours; Then the material that mixes is put in the meshbeltfurnace of nitrogen atmosphere protection, under 150 ℃ with drying materials 46 hours.The material that drying is good continues to put in the meshbeltfurnace of nitrogen atmosphere protection, and 750 ℃ of following constant temperature 15 hours, material cooled off with stove, obtains the LiFePO4 semi-finished product.Products therefrom is weighed, get according to 3% the aluminum paste that takes by weighing weight and join in the middle of an amount of absolute ethyl alcohol dispersant, adopted the high-speed mixer batch mixing 25 hours; With mixed material, put in the meshbeltfurnace of nitrogen atmosphere protection, under 730 ℃, constant temperature 25 hours.Adopt ball mill to pulverize to the material of coming out of the stove, control product granularity, thus make LiFePO with Mg ion doping 4/ Al/C composite material.
Embodiment 6:
With 2000g lithium dihydrogen phosphate (LiH 2PO 4), 2058g iron hydroxide (Fe (OH) 3), 70g niobium pentaoxide (Nb 2O 5), 100g sucrose, join in the 9Kg deionized water, ball milling is 12 hours in circulating ultra-fine mill, the medium of use is the zirconia ball of diameter 1mm.Adopt in the vacuum drier dry 15 hours then.The material that drying is good continues to put in the nitrogen atmosphere protection push-plate type tunnel cave, 750 ℃ of following constant temperature 20 hours, and material cools off with stove, obtains the LiFePO4 semi-finished product.Products therefrom is weighed, and getting and joining an amount of carbon dope amount according to 2% the nanometer aluminium powder that takes by weighing weight is in 4% aqueous tartaric acid solution, adopts the high-speed mixer batch mixing 19 hours; With mixed material, put in the nitrogen atmosphere protection push-plate type tunnel cave, under 750 ℃, constant temperature 6 hours.Adopt airslide disintegrating mill to pulverize to the material of coming out of the stove, thereby make LiFePO with Nb ion doping 4/ Al/C composite material.
Embodiment recited above is described embodiments of the present invention; under the prerequisite that does not break away from design concept of the present invention; various modification and improvement that technical research personnel in this area make technical scheme of the present invention all should fall into protection scope of the present invention.

Claims (9)

1. lithium iron phosphate aluminum carbon composite anode material, it is characterized in that, be the conductive layer that has aluminium simple substance and carbon composite particles to constitute in LiFePO4 or the LiFePO4 lattice coated with uniform that is doped with metal ion, described aluminium simple substance accounts for 0.1～10% of composite material percentage by weight; Described carbon composite particles accounts for 0.1～10% of composite material percentage by weight.
2. a kind of lithium iron phosphate aluminum carbon composite anode material according to claim 1 is characterized in that, the doping of metal ion is 0～5% of Li or a Fe molar fraction in the described LiFePO4 that is doped with metal ion.
3. a kind of lithium iron phosphate aluminum carbon composite anode material according to claim 1 is characterized in that, described aluminium simple substance is one or more in nanometer aluminium powder, trickle aluminium powder, high pure spherical aluminium powder, flake aluminum, the aluminum paste.
4. a kind of lithium iron phosphate aluminum carbon composite anode material according to claim 1, it is characterized in that, described carbon composite particles is compound by organic carbon source, and described organic carbon source is one or more in glucose, sucrose, tartaric acid, urea, citric acid, gluconic acid, cellobiose, polyethylene glycol, polyvinyl alcohol, POLYPROPYLENE GLYCOL, soluble starch, phenolic resins, the epoxy resin.
5. a kind of lithium iron phosphate aluminum carbon composite anode material according to claim 1 is characterized in that described dispersant is water, absolute ethyl alcohol, acetone.
6. the preparation method of a lithium iron phosphate aluminum carbon composite anode material is characterized in that, may further comprise the steps:
1) lithium salts, divalent iron salt, microcosmic salt are joined in dispersant or the organic carbon source solvent according to stoichiometric proportion, adopt wet ball grinding 0.5～48 hour to slurry; Wherein the amount of dispersant is to decide according to the slurry viscosity that mixing apparatus requires, and the organic carbon source addition is 0.1～10wt% for the theoretical phosphorus content of final generation LiFePO4;
2) with after the step 1) gained pulp separation, drying is 5～20 hours in drier, obtains moisture content and is less than or equal to 0.5% dried mixture;
3) with step 2) products therefrom, to put into reacting furnace 250～800 ℃ of following constant temperature under inert atmosphere protection and handled 4～30 hours, material is natural cooling in stove, obtains that carbon coats or the LiFePO4 semi-finished product of carbon coated not;
4) the LiFePO4 semi-finished product of step 3) gained are weighed; 0.1～10% the aluminium simple substance that adds the semi-finished product weight fraction; The LiFePO4 semi-finished product of carbon coated are not joined in the organic carbon source solvent, and the organic carbon source addition is 0.1～10wt% for making the theoretical phosphorus content of final generation LiFePO4; Coat semi-finished product for carbon and then join in dispersant or the organic carbon source solvent, wherein the addition of dispersant is decided according to the slurry viscosity that mixing apparatus requires; The organic carbon source addition is 0.1～10wt% for making the theoretical phosphorus content of final generation LiFePO4, and organic carbon source interpolation total amount is no more than making the theoretical phosphorus content of final generation LiFePO4 is 10wt%; Adopt wet ball grinding 0.5～48 hour to slurry;
5) step 4) gained slurry ball material is separated after, moist or in drier, be dried to absolutely dry or leather hard;
6) products therefrom in the step 5) is put into reacting furnace; Under inert atmosphere protection, handled 4～30 hours in 660～900 ℃ of following constant temperature;
7) material natural cooling in stove carries out pulverization process to product, finally obtains the lithium iron phosphate aluminum carbon composite anode material.
7. the preparation method of lithium iron phosphate aluminum carbon composite anode material according to claim 2 is characterized in that, comprises the metal oxide or the slaine of Li or Fe molar fraction 0～5% in the described step (1).
8. the preparation method of a lithium iron phosphate aluminum carbon composite anode material is characterized in that, may further comprise the steps:
1) lithium salts, trivalent iron salt, microcosmic salt are joined in the organic carbon source solvent according to stoichiometric proportion, the organic carbon source addition was 0.1～10wt% for making the theoretical phosphorus content of final generation LiFePO4 to the employing wet ball grinding to slurry in 0.5～48 hour;
2) with after the step 1) gained pulp separation, drying is 5～20 hours in drier, obtains moisture content and is less than or equal to 0.5% dried mixture;
3) with step 2) products therefrom, to put into reacting furnace 250～800 ℃ of following constant temperature under inert atmosphere protection and handled 4～30 hours, material is natural cooling in stove, obtains the LiFePO4 semi-finished product that carbon coats;
4) step 3) gained LiFePO4 semi-finished product are weighed, add 0.1～10% aluminium simple substance of semi-finished product weight fraction; Join in dispersant or the organic carbon source solvent, wherein the addition of dispersant is to decide according to the slurry viscosity that mixing apparatus requires, the organic carbon source addition is 0.1～10wt% for making the theoretical phosphorus content of final generation LiFePO4, and twice organic carbon source adds total amount and be no more than that to make the theoretical phosphorus content of final generation LiFePO4 be 10wt%; Adopt wet ball grinding 0.5～48 hour to slurry;
5) with after the step 4) gained pulp separation, moist, or in drier, be dried to absolutely dry or leather hard all can, obtain mixture;
6) with products therefrom in the step 5), to put into reacting furnace 660～900 ℃ of following constant temperature under inert atmosphere protection and handled 4～30 hours, material is natural cooling in stove, and product is carried out pulverization process, finally obtains the lithium iron phosphate aluminum carbon composite anode material.
9. the preparation method of lithium iron phosphate aluminum carbon composite anode material according to claim 7 is characterized in that, comprises the metal oxide or the slaine of Li or Fe molar fraction 0～5% in the described step (1).
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CN103904325A (en) * 2014-03-21 2014-07-02 天津大学 High-multiplying-power type lithium iron phosphate/carbon composite material and preparation method thereof
CN105702961A (en) * 2014-11-27 2016-06-22 比亚迪股份有限公司 Positive pole material and lithium ion battery
CN105938899A (en) * 2016-06-01 2016-09-14 中南大学 Preparation method and application of cathode material of fast ion conductor coated modified lithium ion battery
CN106450289A (en) * 2016-08-17 2017-02-22 中信大锰矿业有限责任公司大新锰矿分公司 High-voltage lithium cobalt oxide positive electrode material and preparation method therefor
CN111403695A (en) * 2019-11-11 2020-07-10 余姚市鑫和电池材料有限公司 Preparation method of carbon-aluminum-coated lithium iron phosphate positive electrode material

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CN101179124A (en) * 2007-08-24 2008-05-14 郑州德朗能电池有限公司 Method for producing high performance lithium ion battery anode material LiFePO4/C
CN101162776A (en) * 2007-10-26 2008-04-16 深圳市贝特瑞新能源材料股份有限公司 Lithium iron phosphate suitable for high multiplying power electrokinetic cell and method for producing the same
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CN102299327B (en) * 2011-08-05 2014-03-12 陕西科技大学 Preparation method for lithium-aluminum doped carbon cladded lithium iron phosphate anode material
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