CN1990144A - Preparing process for positive electrode active material/carbon composite material of Li-ion battery - Google Patents
Preparing process for positive electrode active material/carbon composite material of Li-ion battery Download PDFInfo
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- CN1990144A CN1990144A CNA2005101352278A CN200510135227A CN1990144A CN 1990144 A CN1990144 A CN 1990144A CN A2005101352278 A CNA2005101352278 A CN A2005101352278A CN 200510135227 A CN200510135227 A CN 200510135227A CN 1990144 A CN1990144 A CN 1990144A
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Abstract
A preparing method of lithium-ion battery positive active material / carbon composite material, the method includes: dissolving the carbon coated materials into solvent to getting the carbon coated materials solvent, then mixing and adglutinating the carbon coated materials solvent and the lithium-ion battery positive active material, said carbon coated materials are chosen on or more from sucrose, glucose, starch, lactose, sorbitol, maltose, phenolic resin, furfural resin, urea formaldehyde resin, polyvinyl alcohol, dene PTFE, polyacrylamide, water-soluble epoxide resin, said solvent is chosen one or more of water, acetone, ethanol and carbinol, said agglutination is processed in inert atmosphere. The quality and specific capacity of the lithium-ion battery complex positive material prepared through the method in the invention is higher, the multiplying power battery charging capability is good, it can be used to button, cylindrical and square lithium ion batteries widely.
Description
Technical field
The invention relates to a kind of preparation method of lithium ion secondary battery anode material, especially about a kind of preparation method of active substance of lithium ion battery anode/carbon composite.
Background technology
Characteristics such as lithium ion battery has high-energy, long-life, lowly pollutes, in light weight, life-span length, memoryless property, portable electric appts such as mobile phone, notebook computer, camera have 80% use lithium rechargeable battery approximately at present.
Lithium ion battery mainly comprises battery container, electrode pole piece and electrolyte, described electrode pole piece comprises positive pole, negative pole and the barrier film that anodal, negative pole are separated, described positive pole comprises collector body and attached to the positive electrode on the collector body, described positive electrode comprises positive active material, conductive agent, adhesive and other various additives.The positive active material that is used for lithium ion battery mainly comprises LiCoO at present
2, LiNiO
2, LiMn
2O
4And LiNi
1/3Co
1/3Mn
1/3O
2Described conductive agent mainly contains acetylene black, carbon black, electrically conductive graphite etc.A basic demand of lithium ion cell positive is exactly that positive active material and conductive agent will mix.But, thereby be difficult to conductive agent is evenly spread in the positive active material because the conductive agent granularity is little, specific area is big.
It is the lithium secondary battery of positive active material that CN 1416189A discloses with the composite material covered with nano surface, this battery is characterised in that described positive electrode active material powder is through Nanosurface coating modification processing, clad material is one or more in semimetal, oxide or the salts substances, the average thickness of clad is the 0.5-200 nanometer, and particle diameter is the 0.1-200 nanometer.The purpose of this invention is in order to carry out surface coating processing by particle or electrode surface to anode material for lithium-ion batteries in the prior art; active material and electrolyte in the surface coating layer are separated; change positive electrode particle surface local distribution of charges state; thereby change the surface physics and the chemical characteristic of positive electrode active materials, to improve the cycle performance of positive electrode.
Summary of the invention
The objective of the invention is to take into account simultaneously the shortcoming of specific capacity and multiplying power discharging property, a kind of preparation method who has simultaneously than the active substance of lithium ion battery anode/carbon composite of height ratio capacity and good multiplying power discharging property is provided for the positive electrode that overcomes prior art for preparing.
The inventor discovers, although the described method of CN 1416189A is to adopt the finished product positive electrode active material powder to carry out surface coating modification, mention that also semi-metallic comprises material with carbon element, concrete grammar comprises material with carbon element is dissolved in the appropriate solvent, to join in the above-mentioned solution through the active material powder of certain surface preparation then, with the solution roasting, clad material is decomposed then, obtain the composite material covered with nano surface positive active material.But do not provide concrete material with carbon element and so-called suitable solvent in the whole specification of this application, even and do not provide the method for operating and the condition of coating in an embodiment yet, experimental result only provides charge-discharge performance.After reading above-mentioned application, those skilled in the art do not know that still this solution that adopts which kind of material with carbon element to be dissolved in to obtain in which kind of solvent carries out the surface to positive electrode active material powder and coats, just can obtain all preferable positive electrode of cycle performance and specific capacity, especially more can not learn how to obtain specific capacity and all preferable positive electrode of multiplying power discharging property.
The inventor is surprised to find that, by being dissolved into, phenolic resins obtains transparent solution in the acetone, then finished product lithium oxygen plus plate active material is mixed with above-mentioned solution, sintering behind the ball milling, obtain the lithium oxygen plus plate active material that carbon coats, up to 128mAh, specific capacity restrains up to 151mAh/ up to 149mAh, 2C discharge capacity up to 151mAh, 1C discharge capacity to contain the positive electrode 0.5C discharge capacity of this positive active material.Trace it to its cause, mainly be because carbon all is coated on the positive active material surface in active substance of lithium ion battery anode/carbon composite that the present invention obtains, and do not enter in the lattice of positive active material, thereby make positive electrode have higher specific capacity and multiplying power discharging property.
The invention provides a kind of preparation method of active substance of lithium ion battery anode/carbon composite, this method comprises carbon encapsulated material is dissolved in the solvent, obtain carbon encapsulated material solution, then carbon encapsulated material solution is mixed with active substance of lithium ion battery anode, sintering, wherein, described carbon encapsulated material is selected from sucrose, glucose, starch, lactose, sorbose, maltose, polyvinyl alcohol, inclined to one side polytetrafluoroethylene (PTFE), polyacrylamide, water-soluble epoxy resin, phenolic resins, furfural resin, in the Lauxite one or more, described solvent is selected from water, acetone, ethanol, in the methyl alcohol one or more, described sintering carries out in inert atmosphere.
The preparation method of active substance of lithium ion battery anode/carbon composite of the present invention is applicable to various active substance of lithium ion battery anode.When adopting phenolic resins as carbon encapsulated material, up to 128mAh, specific capacity restrains up to 151mAh/ the lithium oxygen plus plate active material/carbon composite 0.5C discharge capacity that makes with method provided by the invention up to 149mAh, 2C discharge capacity up to 151mAh, 1C discharge capacity; When adopting polyacrylamide as carbon encapsulated material, up to 129mAh, specific capacity restrains up to 160mAh/ the Li-Ni-Mn-Co-O/carbon composite 0.5C discharge capacity that makes with method provided by the invention up to 157mAh, 2C discharge capacity up to 160mAh, 1C discharge capacity; When adopting furfural resin as carbon encapsulated material, up to 122mAh, specific capacity restrains up to 137mAh/ the lithium manganese oxygen/carbon composite 0.5C discharge capacity that makes with method provided by the invention up to 136mAh, 2C discharge capacity up to 137mAh, 1C discharge capacity.And method provided by the invention is simple to operate, and raw material is easy to get, and is easy to large-scale production.Quality of materials specific capacity height, rate charge-discharge performance with this method preparation are good, can be widely used in button, cylindrical and square lithium ion battery.
Description of drawings
Fig. 1 is the LiCoO of the embodiment of the invention 1 preparation
2The XRD figure spectrum of/carbon composite;
Fig. 2 is the LiCoO of the embodiment of the invention 1 preparation
2The multiplying power discharging curve map of/carbon composite;
Fig. 3 is the LiNi of the embodiment of the invention 2 preparations
1/3Mn
/ 13Co
1/3O
2The XRD figure spectrum of/carbon composite;
Fig. 4 is the LiNi of the embodiment of the invention 2 preparations
1/3Mn
/ 13Co
1/3O
2The multiplying power discharging curve map of/carbon composite;
Fig. 5 is the LiMn of the embodiment of the invention 3 preparations
2O
4The XRD figure spectrum of/carbon composite;
Fig. 6 is the LiMn of the embodiment of the invention 3 preparations
2O
4The multiplying power discharging curve map of/carbon composite;
Fig. 7 is the LiCoO of the embodiment of the invention 4 preparations
2The multiplying power discharging curve map of/carbon composite;
Fig. 8 is the LiCoO of the embodiment of the invention 5 preparations
2The multiplying power discharging curve map of/carbon composite;
Fig. 9 is the LiCoO of the embodiment of the invention 6 preparations
2The multiplying power discharging curve map of/carbon composite;
Figure 10 is LiCoO
2The multiplying power discharging curve map;
Figure 11 is the weight-loss curve figure of sucrose.
The specific embodiment
The invention provides a kind of preparation method of active substance of lithium ion battery anode/carbon composite, this method comprises carbon encapsulated material is dissolved in the solvent, obtain carbon encapsulated material solution, then carbon encapsulated material solution is mixed with active substance of lithium ion battery anode, sintering, wherein, described carbon encapsulated material is selected from sucrose, glucose, starch, lactose, sorbose, maltose, polyvinyl alcohol, inclined to one side polytetrafluoroethylene (PTFE), polyacrylamide, water-soluble epoxy resin, phenolic resins, furfural resin, in the Lauxite one or more, described solvent is selected from water, acetone, ethanol, in the methyl alcohol one or more, described sintering carries out in inert atmosphere.
The present invention to phenolic resins, furfural resin, Lauxite, polyvinyl alcohol, partially the molecular weight of polytetrafluoroethylene (PTFE), polyacrylamide, water-soluble epoxy resin there is no particular limitation, the above-mentioned resin of various molecular weight all can be realized purpose of the present invention.Under the preferable case, the number-average molecular weight of described resin is 400-4000.
In order to make carbon encapsulated material be attached to the active substance of lithium ion battery anode surface equably, described in the present invention carbon encapsulated material is dissolved into and preferably makes carbon encapsulated material in solvent, form the carbon encapsulated material solution of homogeneous in the solvent.For this reason, when described carbon encapsulated material be sucrose, glucose, starch, lactose, sorbose, maltose, polyvinyl alcohol, partially during one or more in polytetrafluoroethylene (PTFE), polyacrylamide, the water-soluble epoxy resin, described solvent is preferably water, can save cost so on the one hand, minimizing can reach required dissolubility again simultaneously to the pollution of environment.When described carbon encapsulated material was phenolic resins, furfural resin, Lauxite organic high molecular compound, described solvent was preferably organic solvent, and described organic solvent can be acetone, ethanol, methyl alcohol or their mixture.
The present invention has no particular limits the addition of carbon encapsulated material and solvent, as long as can form the solution of homogeneous.Under the preferable case, the total amount of sucrose, glucose, starch, lactose, sorbose, maltose, polyvinyl alcohol, inclined to one side polytetrafluoroethylene (PTFE), polyacrylamide, water-soluble epoxy resin is weight ratio 1: 1-50 with the ratio of the addition of deionized water, and the total amount of described phenolic resins, furfural resin, Lauxite is weight ratio 1: 1-50 with the ratio of the addition of organic solvent.
Can adopt conventional mode described carbon encapsulated material to be dissolved into the solution that obtains homogeneous in the solvent.For example, the mode accelerate dissolution that can adopt heating, stirs is fully dissolved carbon encapsulated material.
Active substance of lithium ion battery anode of the present invention can be the positive active material of various lithium ion batteries, as lithium cobalt oxygen, lithium manganese oxygen, lithium nickel oxygen, Li-Ni-Mn-Co-O (LiNi
xMn
yCo
1-x-yO
2, 0.05≤x in the formula≤0.8,0.1≤y≤0.4, x+y≤1).Preferred particle diameter of the present invention is the above-mentioned positive electrode active material powder of 5-20 micron.
Described inert atmosphere is meant not the gas that reacts with positive active material, carbon encapsulated material, as group 0 element gas in the nitrogen and the periodic table of elements.Described inert atmosphere is in order to make carbon encapsulated material pyrolysis at high temperature produce carbon simple substance, rather than carbide.
The mixing ratio of described carbon encapsulated material solution and active substance of lithium ion battery anode so that in the active substance of lithium ion battery anode/carbon composite that makes carbon content reach required carbon covering amount and be as the criterion.Because among the present invention, be specific capacity and multiplying power discharging property at the positive active material coated with carbon in order to increase positive electrode, carbon serves as the function of conductive agent in positive electrode, and therefore, the carbon covering amount can be the addition of conductive agent in the conventional positive electrode.Under the preferable case, the carbon covering amount is the 0.01-3 weight % of active substance of lithium ion battery anode weight.Because the carbon that method provided by the present invention is the pyrolysis by carbon encapsulated material (being the carbon precursor) sucrose, glucose, starch, lactose, sorbose, maltose, phenolic resins, furfural resin, Lauxite to be produced is as the carbon source of active substance of lithium ion battery anode/carbon composite, so the addition of carbon encapsulated material sucrose, glucose, starch, lactose, sorbose, maltose, phenolic resins, furfural resin, Lauxite is a benchmark with required carbon covering amount.Under the preferable case, carbon encapsulated material is 10-50 with the charge weight ratio of battery positive electrode active material: 100.
Can calculate the carbon covering amount in various manners, for example can adopt difference assay, the weight of positive active material/carbon composite of obtaining behind the sintering is deducted the weight of finished product positive active material (raw material), and the difference of the two is the amount of the carbon that increases in the positive active material/carbon composite that obtains.The also amount of the carbon that increases in the positive active material/carbon composite that can calculate according to the addition of the weight-loss ratio of carbon encapsulated material and clad material.Weight-loss ratio can obtain according to the weight-loss curve of carbon encapsulated material.Because the weight-loss curve of material and the physical state of this material are irrelevant, weight-loss curve when also to be the weight-loss curve of carbon encapsulated material when pure state with carbon encapsulated material and positive active material form mixture is the same, therefore can obtain weight-loss ratio according to the weight-loss curve of pure state carbon encapsulated material, can obtain the carbon encapsulated material addition with required covering amount divided by weight-loss ratio then.For example, weight-loss curve is as shown in figure 11 under nitrogen atmosphere for sucrose.As can be seen from Figure 11, the weight-loss ratio of 700 ℃ of following sucrose is 5.3%, is 1 weight % if make the carbon covering amount of 100 gram positive active materials behind 700 ℃ of following sintering, then needs to add 18.9 gram sucrose.
The following describes the weight that increases behind the positive active material sintering and be the carbon covering amount, rather than the carbon covering amount with enter carbon amount sum in the positive active material.In XRD figure, go out the peak owing to be coated on the carbon on positive active material surface, therefore,, can prove and contain carbon coated if this peak is arranged in the XRD figure in 2 θ=26.14.If carbon is not all to be coated on the positive active material surface, partly or entirely enter in the positive active material lattice but have, the Li in the positive active material and other metallic element going out peak position (i.e. 2 θ values) and can change in XRD figure then, for example, LiCoO
2In 2 θ values be that to move to 19.04,2 θ values be that 45.28 peak moves to 45.34 for 18.96 peak; LiNi
1/3Mn
1/3Co
1/3O
2In 2 θ values be that to move to 18.78,2 θ values be that 44.46 peak moves to 44.56 for 18.68 peak; LiMn
2O
4In 2 θ values be that to move to 18.86,2 θ values be that 44.26 (above X ray is Cu/K α 1) are moved at 44.14 peak for 18.78 peak.If 2 θ values do not change, then provable carbon all is coated on the positive active material surface, and does not enter in the lattice of positive active material.
Because it is feedstock production active substance of lithium ion battery anode/carbon composite that the present invention adopts the finished product positive active material, therefore described sintering only needs carbonaceous organic material pyrolysis generation carbon is got final product, reduce requirement thus, and described sintering only needs one-stage sintering to get final product to sintering temperature.Under the preferable case, the temperature of described sintering is 300-1000 ℃, and more preferably 600-1000 ℃, sintering time is 1-10 hour.
Can directly the solution that contains carbonaceous organic material, active substance of lithium ion battery anode be carried out sintering, carry out sintering after also can earlier the solvent in the solution being removed again.Preferred described sintering carries out after the partial solvent removing at least in the specific embodiment of the invention.Therefore, method provided by the invention comprises also that preferably carbon encapsulated material solution is mixed the back with active substance of lithium ion battery anode remove the step of desolvating.Can in all sorts of ways to remove and desolvate, for example can the natural evaporation solvent, heating, drying solvent or spray-drying remove and desolvate.The removal amount of solvent is not so that liquid splash takes place in solution in sintering process be as the criterion.Because the volatility of water is poor, therefore preferably in the aqueous solution that makes, add right amount alcohol, with the removal of accelerated solvent water.On the other hand, alcohol still is a kind of good dispersant, and positive active material is dispersed in the aqueous solution of carbonaceous organic material better.The addition of alcohol is preferably the 1-50 weight % of aqueous solvent weight.
In order to make carbon can be evenly distributed in the active substance of lithium ion battery anode surface, under the preferable case, method provided by the invention also comprises carbon encapsulated material solution and the step of grinding after active substance of lithium ion battery anode mixes.The concrete operations of described grinding have been conventionally known to one of skill in the art, do not repeat them here.Described grinding was generally carried out before removing solvent.The time of grinding is preferably 1-10 hour.
The following examples will the invention will be further described.
Embodiment 1
Present embodiment is used to illustrate the preparation method of active substance of lithium ion battery anode/carbon composite provided by the invention.
19 gram phenolic resins are dissolved in the acetone, then with 100 gram LiCoO
2(particle diameter is the 5.2-14.6 micron) mixes, ball milling 2 hours, the mixing that obtains remove desolvate the back under nitrogen protection in 800 ℃ of sintering 6 hours, promptly get LiCoO
2/ carbon composite.Fig. 1 is this LiCoO
2The XRD figure spectrum of/carbon composite, the peak at 2 θ=26.14 places among the figure is the characteristic peak of carbon, the product of this explanation preparation is LiCoO
2With the mixture of carbon, the peak of 2 θ=18.96 and 2 θ=45.28 illustrates that then carbon does not enter among the lattice, but is coated on LiCoO
2The surface.LiCoO
2The covering amount of surface carbon is LiCoO
21 weight % of positive active material.
Embodiment 2
Present embodiment is used to illustrate the preparation method of active substance of lithium ion battery anode/carbon composite provided by the invention.
11 gram polyacrylamides are dissolved in the alcohol, then with 100 gram LiNi
1/3Mn
1/3Co
1/3O
2(particle diameter is the 5.6-13.8 micron) mixes, ball milling 2 hours, the mixing that obtains remove desolvate the back under nitrogen protection in 800 ℃ of sintering 2 hours, promptly get LiNi
1/3Mn
1/3Co
1/3O
2/ carbon composite.Fig. 3 is this LiNi
1/3Mn
1/3Co
1/3O
2The XRD figure spectrum of/carbon composite, the peak at 2 θ=26.14 places among the figure is the characteristic peak of carbon, the product of this explanation preparation is LiNi
1/3Mn
1/3Co
1/3O
2With the mixture of carbon, the peak of 2 θ=18.68 and 2 θ=44.46 illustrates that then carbon does not enter LiNi
1/3Mn
1/3Co
1/3O
2In the lattice, but be coated on LiNi
1/3Mn
1/3Co
1/3O
2The surface.Wherein the covering amount of carbon is LiNi
1/3Mn
1/3Co
1/3O
20.5 weight % of positive active material.
Present embodiment is used to illustrate the preparation method of active substance of lithium ion battery anode/carbon composite provided by the invention.
21 gram furfural resins are dissolved in the methyl alcohol, then with 100 gram LiMn
2O
4(particle diameter is the 5.6-14.2 micron) mixes, ball milling 2 hours, the mixing that obtains remove desolvate the back under nitrogen protection in 800 ℃ of sintering 2 hours, promptly get LiMn
2O
4/ carbon composite.Fig. 5 is this LiMn
2O
4The XRD figure spectrum of/carbon composite, the peak at 2 θ=26.14 places among the figure is the characteristic peak of carbon, the product of this explanation preparation is LiNi
1/3Mn
1/3Co
1/3O
2With the mixture of carbon, the peak of 2 θ=18.78 and 2 θ=44.14 illustrates that then carbon does not enter LiMn
2O
4In the lattice, but be coated on LiMn
2O
4The surface.Wherein the covering amount of carbon is LiMn
2O
41 weight % of positive active material.
Embodiment 4
Present embodiment is used to illustrate the preparation method of active substance of lithium ion battery anode/carbon composite provided by the invention.
20 gram phenolic resins and 20 gram Lauxites are dissolved in the acetone, then with 100 gram LiCoO
2(particle diameter is the 5.2-14.6 micron) mixes, ball milling 2 hours, the mixing that obtains remove desolvate the back under nitrogen protection in 800 ℃ of sintering 3 hours, promptly get LiCoO
2/ carbon composite, wherein the covering amount of carbon is LiCoO
22 weight % of positive active material.
Embodiment 5
Present embodiment is used to illustrate the preparation method of active substance of lithium ion battery anode/carbon composite provided by the invention.
In 10 gram sucrose dissolved deionized waters, then with 100 gram LiCoO
2(particle diameter is the 5.2-14.6 micron), 10 gram alcohol mix, ball milling 3 hours, after the mixture that obtains oven dry removes and desolvates, in 800 ℃ of sintering 6 hours, promptly obtain LiCoO under nitrogen protection
2/ carbon composite, wherein the covering amount of carbon is LiCoO
20.5 weight % of positive active material.
Embodiment 6
Present embodiment is used to illustrate the preparation method of active substance of lithium ion battery anode/carbon composite provided by the invention.
11 gram glucose stirring and dissolving in deionized water, are restrained LiCoO with 100 then
2(particle diameter is the 5.6-13.8 micron) and 5 gram alcohol mix, ball milling 2 hours, and after the mixture that obtains oven dry removed and desolvates, 700 ℃ of sintering were 2 hours under nitrogen protection, promptly get LiCoO
2/ carbon composite, wherein the covering amount of carbon is LiCoO
21 weight % of positive active material.
Performance test
Get positive active material and LiCoO that 1 gram embodiment 1-6 makes respectively
2(with the LiCoO among the embodiment 1
2Raw material is identical) and 0.8 gram N-N dimethyl pyrrolidone (Kynoar that contains 12 weight %) be coated on the aluminium foil after mixing, in being full of the glove box of argon gas, with the lithium sheet is negative pole, Celgard 2700 (producer is Celgard) diaphragm paper, the LiPF of 1 mol
6For electrolyte (EC+DMC+DEC (volume ratio 1: 1: 1) is a solvent), be assembled into battery.Above-mentioned battery is discharged and recharged between the 2.8-4.2 volt, and the multiplying power discharging curve is respectively shown in Fig. 2,4,6,7,8,9,10.In the multiplying power discharging curve map, be followed successively by 0.5C, 1C and 2C discharge curve from top to bottom.
As can be seen from Figure 2, the LiCoO that makes of embodiment 1
2The 0.5C discharge capacity of/carbon composite reaches 151mAh, and the 1C discharge capacity reaches 149mAh, and the 2C discharge capacity has also reached 128mAh, and reversible specific capacity is the 151mAh/ gram.
As can be seen from Figure 4, the LiNi that makes of embodiment 2
1/3Mn
1/3Co
1/3O
2The 0.5C discharge capacity of/carbon composite reaches 160mAh, and the 1C discharge capacity reaches 157mAh, and the 2C discharge capacity has also reached 129mAh, and reversible specific capacity is the 160mAh/ gram.
As can be seen from Figure 6, the LiMn that makes of embodiment 3
2O
4The 0.5C discharge capacity of/carbon composite reaches 137mAh, and the 1C discharge capacity reaches 136mAh, and the 2C discharge capacity has also reached 122mAh, and reversible specific capacity is the 137mAh/ gram.
As can be seen from Figure 7, the LiCoO that makes of embodiment 4
2The 0.5C discharge capacity of/carbon composite reaches 158mAh, and the 1C discharge capacity reaches 151mAh, and the 2C discharge capacity has also reached 125mAh, and reversible specific capacity is the 158mAh/ gram.
As can be seen from Figure 8, the LiCoO that makes of embodiment 5
2The 0.5C discharge capacity of/carbon composite is 138mAh, and the 1C discharge capacity is 136mAh, and the 2C discharge capacity is 104mAh, and reversible specific capacity is the 138mAh/ gram.
As can be seen from Figure 9, the LiCoO that makes of embodiment 6
2The 0.5C discharge capacity of/carbon composite is 138mAh, and the 1C discharge capacity is 136mAh, and the 2C discharge capacity is 92mAh, and reversible specific capacity is the 138mAh/ gram.
As can be seen from Figure 10, pure LiCoO
2The 0.5C discharge capacity only be 133mAh, the 1C discharge capacity only is 129mAh, the 2C discharge capacity only is 88mAh, reversible specific capacity is a 133mAh/ gram.
Claims (10)
1, a kind of preparation method of active substance of lithium ion battery anode/carbon composite, this method comprises carbon encapsulated material is dissolved in the solvent, obtain carbon encapsulated material solution, then carbon encapsulated material solution is mixed with active substance of lithium ion battery anode, sintering, it is characterized in that, described carbon encapsulated material is selected from sucrose, glucose, starch, lactose, sorbose, maltose, phenolic resins, furfural resin, Lauxite, polyvinyl alcohol, inclined to one side polytetrafluoroethylene (PTFE), polyacrylamide, in the water-soluble epoxy resin one or more, described solvent is selected from water, acetone, ethanol, in the methyl alcohol one or more, described sintering carries out in inert atmosphere.
2, method according to claim 1, wherein, described carbon encapsulated material is 10-50 with the charge weight ratio of active substance of lithium ion battery anode: 100.
3, method according to claim 1 and 2, wherein, described carbon encapsulated material is selected from one or more in sucrose, glucose, starch, lactose, sorbose, maltose, polyvinyl alcohol, inclined to one side polytetrafluoroethylene (PTFE), polyacrylamide, the water-soluble epoxy resin, and described solvent is a water.
4, method according to claim 1 and 2, wherein, described carbon encapsulated material is selected from one or more in phenolic resins, furfural resin, the Lauxite, and described solvent is selected from one or more in acetone, ethanol, the methyl alcohol.
5, method according to claim 1, wherein, described active substance of lithium ion battery anode is selected from lithium cobalt oxygen, lithium manganese oxygen, lithium nickel oxygen, Li-Ni-Mn-Co-O.
6, method according to claim 5, wherein, the particle diameter of described active substance of lithium ion battery anode is the 5-20 micron.
7, method according to claim 1, wherein, described inert atmosphere is nitrogen, argon gas or their mist.
8, method according to claim 1, wherein, this method also comprises removes the step of desolvating, and this step is carried out before sintering.
9, according to claim 1 or 8 described methods, wherein, this method also comprises mixes the step that grind the back with carbon encapsulated material solution with active substance of lithium ion battery anode.
10, according to claim 1 or 8 described methods, wherein, the temperature of described sintering is 600-1000 ℃, and sintering time is 1-10 hour.
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| CNB2005101352278A CN100515617C (en) | 2005-12-27 | 2005-12-27 | Preparing process for positive electrode active material/carbon composite material of Li-ion battery |
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| CN102237515A (en) * | 2010-04-20 | 2011-11-09 | 深圳市比克电池有限公司 | Lithium ion battery, active cathode material and preparation methods thereof |
| CN102544514A (en) * | 2012-02-15 | 2012-07-04 | 东莞市迈科科技有限公司 | Surface-carbon-modified cathode material of lithium ion battery and method for preparing surface-carbon-modified cathode material |
| CN102931397A (en) * | 2012-11-01 | 2013-02-13 | 彩虹集团公司 | Manufacturing method of carbon coated modified lithium cobaltate anode material |
| US20130320270A1 (en) * | 2012-06-05 | 2013-12-05 | National Taiwan University Of Science And Technology | Carbon/active compound composite material and the manufacturing method thereof |
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| CN104245829A (en) * | 2012-04-27 | 2014-12-24 | 日本合成化学工业株式会社 | Resin composition and use therefor |
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