CN104900907A - Preparation method of slurry for lithium ion batteries - Google Patents

Preparation method of slurry for lithium ion batteries Download PDF

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Publication number
CN104900907A
CN104900907A CN201510323020.7A CN201510323020A CN104900907A CN 104900907 A CN104900907 A CN 104900907A CN 201510323020 A CN201510323020 A CN 201510323020A CN 104900907 A CN104900907 A CN 104900907A
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Prior art keywords
lithium ion
preparation
pulp
ion battery
major ingredient
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CN201510323020.7A
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CN104900907B (en
Inventor
周中心
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Contemporary Amperex Technology Co Ltd
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Ningde Contemporary Amperex Technology Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The application relates to a preparation method of slurry for lithium ion batteries. The preparation method comprises the following steps: mixing a main material including an active material and auxiliary materials including both a conductive agent and a binder to obtain a mixed material I; dispersing and extruding the mixed material I to obtain a mixed material II; dispersing the obtained mixed material II to obtain a mixed material III; then under the vacuum condition, adding a solvent into the mixed material III for dispersion to obtain slurry for lithium ion batteries. The preparation method of slurry for the lithium ion batteries is simple and convenient and easy to operate, requires a short stirring time during production, can complete the whole material dispersion process within a relatively short period of time, has a good dispersion effect, in addition, is low in energy consumption, high in production efficiency and low in manufacturing cost during slurry preparation, and can realize mass production.

Description

A kind of preparation method of pulp of lithium ion battery
Technical field
The application belongs to lithium ion battery and manufactures field, especially, relates to a kind of preparation method of pulp of lithium ion battery.
Background technology
Lithium ion battery have lightweight, energy storage is large, power is large, pollution-free, life-span long, self discharge coefficient is little and many outstanding advantages such as Acclimation temperature wide scope, therefore the favor of extremely people, thus become the optimal power supply of mobile device and electric automobile.
Due in lithium ion battery, all adopt by positive plate, negative plate and be isolated in wherein barrier film winding after obtain battery core.Positive plate generally adopts aluminium foil as collector, and then after surface-coated one deck of collector contains the slurry of positive electrode active materials, then oven dry prepares; In addition, negative plate generally adopts Copper Foil as collector, and then after surface-coated one deck of negative plate contains the slurry of negative active core-shell material, then oven dry prepares; Barrier film then adopts microporous membrane, and contains the slurry of pottery in the surface-coated of microporous membrane, then dries and forms.
When manufacturing lithium ion battery, according to technological requirement, need to prepare a large amount of slurry, and most slurry obtains after being all uniformly mixed by various powders and liquid, is also an operation very important in lithium ion battery preparation process.But the above-mentioned operation mentioned but also exists following problem at present:
1, the active material in major ingredient and auxiliary material are uniformly dispersed comparatively difficult;
2, mixing time is long, and energy resource consumption is large;
3, require powerful equipment, inconvenient operation, energy waste is comparatively serious;
4, need a large amount of labour, labour intensity is high, and operating process is very loaded down with trivial details;
5, the equipment of need of production is numerous, and utilization rate of equipment and installations is low;
6, slurry easily produces bubble.
Summary of the invention
In order to solve the problem, the applicant has carried out studying with keen determination, found that: after the major ingredient including positive electrode active materials is mixed with the auxiliary material including binding agent and conductive agent, carry out disperseing, extruding, and then disperse, under vacuum finally, add solvent and disperse, obtain pulp of lithium ion battery, thus complete the application.
The object of the application is the preparation method providing a kind of pulp of lithium ion battery, comprises following four steps:
(1) major ingredient and auxiliary material are mixed, obtain mixed material I, wherein, described major ingredient comprises active material, described active material is positive electrode active materials or negative active core-shell material, described auxiliary material comprises binding agent and conductive agent, and wherein, described positive electrode active materials is one or more in the transition metal oxide of lithium;
(2) the mixed material I obtained in step (1) is carried out disperseing, extruding, obtain mixed material II;
(3) the mixed material II obtained in step (2) is disperseed, obtain mixed material III;
(4) under vacuum conditions, add solvent in the mixed material III obtained in step (3) and disperse, obtain pulp of lithium ion battery.
The preparation method of a kind of pulp of lithium ion battery that the application provides, simple and convenient, be easy to operation, and in process of production, mixing time is few, just can complete the whole dispersion process of material in the short period of time and dispersion effect is good, in addition, stir under the condition of vacuum owing to adopting, not only impel the gas of the micropore be positioned on material particles to discharge completely, and add solvent under vacuum conditions and stir, slurry can not produce bubble.In addition, in the process preparing slurry, energy resource consumption is low, production efficiency is high, and production cost is low, can produce on a large scale.
Accompanying drawing explanation
Fig. 1 is the pulp of lithium ion battery 1 that embodiment obtains #scanning electron microscopic picture;
Fig. 2 is the scanning electron microscopic picture of the longitudinal cross-section of the pole piece 1 that test example obtains;
Fig. 3 is the scanning electron microscopic picture on the surface of the pole piece 2 that test example obtains;
Fig. 4 is the scanning electron microscopic picture of the longitudinal cross-section of the pole piece 2 that test example obtains;
Fig. 5 is the scanning electron microscopic picture on the surface of the pole piece 3 that test example obtains;
Fig. 6 is the scanning electron microscopic picture on the surface of the pole piece 4 that test example obtains;
Fig. 7 is the scanning electron microscopic picture on the surface of the pole piece 5 that test example obtains.
Embodiment
Be described in detail below by the application, the feature of the application and advantage will illustrate along with these and become more clear, clear and definite.
The object of the application is the preparation method providing a kind of pulp of lithium ion battery, comprises following four steps.
Step one, major ingredient and auxiliary material to be mixed, obtain mixed material I.
In above-mentioned steps one, major ingredient comprises active material, and wherein, active material is positive electrode active materials or negative active core-shell material.
According to the application, the not special restriction of concrete kind of positive electrode active materials and negative active core-shell material, can select according to the actual requirements.
In a preferred embodiment, described positive electrode active materials is selected from one or more in the transition metal oxide of lithium.
As the example of the transition metal oxide of lithium, specifically can enumerate: LiNi xmn 1-xo 2, LiCoO 2, LiNiO 2, LiCo 1-(x+y)ni xmn yo 2, LiCo xni 1-xo 2, LiVPO 4, LiMnO 2, Li 2mnO 4, LiFePO 4, wherein, x, y, x+y are all less than 1.
In a preferred embodiment, described negative active core-shell material is selected from one or more in carbon materials.Wherein, the concrete kind of carbon materials is not subject to concrete restriction, can select according to the actual requirements.
As the example of carbon materials, specifically can enumerate: graphite, coke, carbon fiber, carbon black.
In a preferred embodiment, positive electrode active materials is selected from LiNi xmn 1-xo 2, LiCoO 2, LiNiO 2, LiCo 1-(x+y)ni xmn yo 2, LiCo xni 1-xo 2, LiVPO 4, LiMnO 2, Li 2mnO 4, LiFePO 4in one or more, wherein, x, y, x+y are all less than 1.Further, positive electrode active materials is preferably LiCoO 2, LiMnO 2, Li 2mnO 4, LiNiO 2, LiCo 1-(x+y)ni xmn yo 2, LiFePO 4in one or more, further, positive electrode active materials is preferably LiCoO 2, LiMnO 2, LiNiO 2, LiCo 1-(x+y)ni xmn yo 2, LiFePO 4in one or more.
In a preferred embodiment, negative active core-shell material is selected from one or more in graphite, coke, carbon fiber and carbon black.Further, negative active core-shell material be preferably in graphite, coke and carbon black one or more, further, negative active core-shell material is preferably graphite.
In above-mentioned steps one, described auxiliary material comprises binding agent and conductive agent.Wherein, the use kind of binding agent and conductive agent is not subject to special restriction, can select the concrete kind of binding agent and conductive agent according to the actual requirements.
As the example of binding agent, specifically can enumerate, polyvinyl alcohol adhesive, polyurethane adhesive, polyacrylate binder, Kynoar binding agent, acrylonitrile-butadiene rubber binding agent, epoxy adhesive, vinyl acetate resin binding agent, chlorinated rubber binding agent and CMC binding agent.
In a preferred embodiment, described binding agent is selected from one or more in polyurethane adhesive, polyacrylate binder, Kynoar binding agent, acrylonitrile-butadiene rubber binding agent, epoxy adhesive, chlorinated rubber binding agent and CMC binding agent.Further preferably, described binding agent is selected from one or more in polyurethane adhesive, Kynoar binding agent, polyacrylate binder and CMC.Still more preferably, described binding agent is selected from one or more in Kynoar binding agent and CMC binding agent.
As the example of conductive agent, specifically can enumerate, conductive black, superconduction carbon black, acetylene black, carbon nano-tube, carbon dust, carbon fiber and graphite agent KS-6.
In a preferred embodiment, described conductive agent be selected from conductive black, carbon nano-tube, carbon dust, carbon fiber, graphite agent KS-6 one or more, still more preferably, conductive agent be selected from carbon dust, graphite agent KS-6 one or more.
In above-mentioned steps one, the total weight of auxiliary material is 0.5 ~ 20% of the total weight of major ingredient.Especially, the total weight of auxiliary material is preferably 1 ~ 15% of the total weight of major ingredient, and further, the total weight of auxiliary material is preferably 1.5 ~ 8.5% of the total weight of major ingredient, and further, the total weight of auxiliary material is preferably 2.5 ~ 6.5% of the total weight of major ingredient.
When auxiliary material comprises conductive agent and binding agent, the use amount of conductive agent and binding agent can be selected according to actual conditions.
In a preferred embodiment, conductive agent is conductive agent with the ratio of the weight of binding agent: binding agent=(0.5 ~ 10): 1, further, conductive agent is preferably conductive agent with the ratio of the weight of binding agent: binding agent=(0.8 ~ 7.5): 1, further, conductive agent is preferably conductive agent with the ratio of the weight of binding agent: binding agent=(1.2 ~ 5.5): 1, most preferably are conductive agent: binding agent=(1.5 ~ 2.5): 1.
Additive can also be comprised in auxiliary material.Wherein, the kind of additive and consumption are not subject to concrete restriction, can select kind and the consumption of additive according to the actual requirements.In a preferred embodiment, lithium carbonate can be selected as anode additive.
In above-mentioned steps one, major ingredient and auxiliary material hybrid mode are not subject to concrete restriction, as long as major ingredient and auxiliary material are mixed.Especially, pipe-line mixer is selected to mix.
In a preferred embodiment, auxiliary material is mixed, then mix with major ingredient.More particularly, when mixed accessories, add conductive agent successively, binding agent mixes.Select and first add conductive agent, after add binding agent mode when mixing, binding agent carries out predissolve without the need to solvent, not only can greatly reduce mixing time, and can reduce the input of dissolving tank equipment, therefore, greatly reduces energy resource consumption.
In further preferred embodiment, major ingredient joins in major ingredient sending cans, and auxiliary material joins in premixing tank and mixes, especially, in premixing tank, add conductive agent, binding agent successively, then the auxiliary material mixed is mixed with major ingredient in blanking pipe.
Especially, the pressure 1 in major ingredient sending cans is 10 ~ 80KPa.
In a preferred embodiment, the pressure 2 in premixing tank is 1.03 ~ 3 times of pressure 1, and further, pressure 2 is preferably 1.05 ~ 2.5 times of pressure 1, and further, pressure 2 is preferably 1.15 ~ 2 times of pressure 1, most preferably is 1.2 ~ 1.8 times.
In a preferred embodiment, the pressure 3 in blanking pipe is 0.03 ~ 0.18MPa, and further, pressure 3 is preferably 0.05 ~ 0.17MPa, and further, pressure 3 is preferably 0.08 ~ 0.12MPa.
In above-mentioned further preferred embodiment, major ingredient in major ingredient sending cans, under the effect of fluidized gas, enter in blanking pipe by big-diameter pipeline, and the auxiliary material in premixing tank, under the effect of fluidized gas, enter in blanking pipe by small-caliber pipeline, then major ingredient and auxiliary material mix in blanking pipe.Especially, select compressed air as fluidized gas.Major ingredient and auxiliary material adopt aforesaid way to mix, and not only reduce mixer mixing time, and production efficiency are further improved.
In above-mentioned steps one, the not special restriction of temperature when major ingredient and auxiliary material being mixed, can set according to the actual requirements, and especially, major ingredient and auxiliary material are selected at room temperature to mix.
Step 2, the mixed material I obtained in step one is carried out disperseing, extrude, acquisition mixed material II.
In above-mentioned steps two, the mode of dispersion and the speed of dispersion are not subject to concrete restriction, as long as major ingredient and auxiliary material are uniformly dispersed.Especially, select mixer to carry out powerful mechanical dispersion to major ingredient and auxiliary material, reach finely dispersed object.
In further preferred embodiment, when mixed material I being carried out high-speed stirred dispersion, wherein, the wire rate of dispersed with stirring is 10 ~ 28m/s, further, the wire rate of dispersed with stirring is preferably 13 ~ 25m/s, further, the wire rate of dispersed with stirring is preferably 18 ~ 23m/s, most preferably is 22m/s.
In above-mentioned steps two, the not special restriction of jitter time, can select according to the actual requirements.
In a preferred embodiment, jitter time is 0.5 ~ 60 minute, and further, jitter time is preferably 1 ~ 40 minute, and further, jitter time is preferably 1.5 ~ 30 minutes, most preferably is 2 ~ 15 minutes.
In above-mentioned steps two, to the not special restriction of pressure adopted during the extruding of mixed material after dispersion, can select according to the actual requirements.
In a preferred embodiment, the pressure of extruding is 0.1 ~ 10MPa, and further, pressure is preferably 0.3 ~ 8MPa, and further, pressure is preferably 1 ~ 6MPa, most preferably is 2 ~ 4MPa.
In above-mentioned steps two, the mode of extruding is not subject to concrete restriction, can select according to the actual requirements.Especially, presser type paddle is selected repeatedly to extrude the major ingredient mixed and auxiliary material.Mixed material is towards mixer flows in extrusion process, and rise along tank skin, then be extruded and flow downward, be so repeatedly squeezed, finely dispersed auxiliary material tightly can be coated on major ingredient particle surface.Find after deliberation, after the mixed material after dispersion is carried out extrusion process, binding agent and conductive agent can be made to be evenly distributed on major ingredient particle surface, thus promote the chemical property of battery core further, such as cycle life.
In above-mentioned steps two, the time not special restriction of extruding, can select according to the actual requirements.
In a preferred embodiment, extrusion time is 0.5 ~ 60 minute, and further, extrusion time is preferably 1 ~ 45 minute, and further, extrusion time is preferably 2 ~ 25 minutes, most preferably is 2.5 ~ 15 minutes.
In above-mentioned steps two, mixed material I is carried out the not special restriction of temperature when disperseing and extrude, can select according to the actual requirements.Especially, at ambient temperature, major ingredient and auxiliary material are carried out disperseing, extruding.
Step 3, the mixed material II obtained in step 2 to be disperseed, obtain mixed material III.
In above-mentioned steps three, the not special restriction of mode of dispersion, can select according to the actual requirements.Especially, mixer is selected to disperse mixed material II.
In a preferred embodiment, when carrying out dispersed with stirring to mixed material II, stir speed (S.S.) is 3 ~ 20m/s, and further, the speed of stirring is preferably 5 ~ 15m/s, and further, the speed of stirring is preferably 8 ~ 12m/s, most preferably is 10m/s.
In above-mentioned steps three, the not special restriction of jitter time, can select according to the actual requirements.Especially, jitter time is preferably 0.5 ~ 50 minute, and further, jitter time is preferably 1 ~ 30 minute, a nearlyer step, and jitter time is preferably 2 ~ 15 minutes, most preferably is 3 ~ 10 minutes.
In above-mentioned steps three, the not special restriction of temperature when being disperseed by mixed material II, can select according to the actual requirements.Especially, select at room temperature to disperse mixed material II.
In above-mentioned steps three, after being disperseed by the mixed material II obtained in step 2, material carries out natural packing.
Add solvent in step 4, the mixed material III that obtains in step 3 to disperse, obtain pulp of lithium ion battery.
In above-mentioned steps four, described solvent is one or more in water and organic solvent.
In a preferred embodiment, described solvent is one or more in water, heterocycle compound and ketone compounds.
As the example of heterocycle compound, specifically can enumerate: oxolane, pyridine, 1-METHYLPYRROLIDONE and pyrroles.
As the example of ketone compounds, specifically can enumerate: acetone, butanone, pentanone.
In a preferred embodiment, solvent is water, oxolane, 1-METHYLPYRROLIDONE, one or more in acetone, butanone, further, solvent be preferably in water, 1-METHYLPYRROLIDONE and acetone one or more.
Especially, wet concentration deionized water.
In above-mentioned steps four, the not special restriction of addition of described solvent, can select according to the actual requirements.
In a preferred embodiment, the addition of solvent is 10 ~ 90% of the total weight of major ingredient, further, the addition of solvent is preferably 15 ~ 80% of the total weight of major ingredient, further, the addition of solvent is preferably 25 ~ 65% of the total weight of major ingredient, most preferably is 35 ~ 55%.
In a preferred embodiment, under vacuum, add solvent in the mixed material III obtained in step 3 to disperse.
In further preferred embodiment, vacuum degree is-0.095 ~-0.001MPa, especially, vacuum degree is-0.093 ~-0.005MPa, further, vacuum degree is preferably-0.09 ~-0.008MPa, further, vacuum degree is preferably-0.088 ~-0.012MPa, most preferably is-0.085 ~-0.018MPa.
Study discovery through the applicant, stir under the condition of vacuum owing to adopting, not only impel the gas of the micropore be positioned on material particles to discharge completely, and add solvent under vacuum conditions and stir, slurry can not produce bubble.
In addition, in this application, select the addition manner that solvent once adds, not only shorten mixing time, and make the viscosity of mixed material in whole whipping process lower, therefore, instrument power hungry is little, further enhances productivity.
In above-mentioned steps four, the not special restriction of jitter time, can select according to actual conditions, as long as system mixed.Especially, jitter time is 2 ~ 50 minutes, and further, mixing time is preferably 3 ~ 30 minutes, and further, mixing time is preferably 5 ~ 20 minutes, most preferably is 8 ~ 15 minutes.
In a preferred embodiment, when the active material that major ingredient comprises is negative active core-shell material, while adding solvent, can also SBR emulsion be added, wherein, can according to actual conditions, select kind and the addition of SBR emulsion, especially, the addition of SBR emulsion is 1 ~ 10% of the total weight of solvent, most preferably is 2 ~ 3%.
Embodiment
The application is further described below by way of instantiation.But these examples are only exemplary, do not form any restriction to the protection range of the application.
In following embodiment, comparative example and test example, as to the material, reagent and the instrument that use as there is no specified otherwise, then all can obtain from commercial channels.
In the following embodiments: solvent: 1-METHYLPYRROLIDONE (referred to as NMP), binding agent: Kynoar (referred to as PVDF, model is JH-2), CMC (referred to as CMC); Conductive agent: graphite, carbon dust, conductive agent KS-6, carbon nano-tube (CNT).
In following test example, lithium battery diaphragm: the polypropylene barrier film provided by Celgard company, its thickness is 16 microns, and model is A723; Electrolyte: the lithium hexafluoro phosphate (LiPF containing 1.2M 6), solvent is ethylene carbonate: methyl ethyl carbonate: dimethyl carbonate=30: the mixed solvent of 20: 50 (weight ratios); In test example two, with each pole piece form the positive plate of battery and negative plate prepares by conventional method.
Embodiment pulp of lithium ion battery 1 #~ 5 #preparation
(1) major ingredient is joined in major ingredient sending cans, auxiliary material is joined in premixing tank and mixes, then major ingredient and auxiliary material are joined in blanking pipe and mix, obtain mixed material I, wherein, the pressure 3 in the pressure 1 in major ingredient sending cans, the pressure 2 in premixing tank and blanking pipe is set;
(2) the mixed material I obtained in step (1) is disperseed in mixer, and the presser type paddle opening mixer extrudes, obtain mixed material II, wherein, the pressure of jitter time, extruding and extrusion time are set;
(3) the mixed material II obtained in step (2) is disperseed, obtain mixed material III, wherein, jitter time is set;
(4) frequency conversion vacuum equipment is selected to vacuumize system, under vacuum, in the mixed material III obtained in step (3), add solvent and/or emulsion is disperseed, obtain pulp of lithium ion battery, wherein, vacuum degree is set.
In above-mentioned preparation process, the kind of each used material, the addition of each material and corresponding technological parameter are as shown in following table 1.
Table 1
Test example
sem test
one, pulp of lithium ion battery 1 # eSEM
To the pulp of lithium ion battery 1 obtained in embodiment #carry out sem test, result as shown in Figure 1.
In FIG, larger uniform particles distribution, and be dispersed with granule at the surface uniform of larger particle, thus, can be learnt by Fig. 1: the Granular composite of the pulp of lithium ion battery that the application obtains is even, and binding agent and conductive agent are evenly coated on the surface of positive electrode active materials.
two, pole piece ESEM
1, the preparation of pole piece 1 ~ 5
(1) pulp of lithium ion battery of acquisition is coated in the surface of collector, then carries out carrying out drying at 90 DEG C, obtain pulp layer, make the thickness of pulp layer be 12 microns;
(2) the pole collector containing pulp layer dried in step (1) is carried out roll-in and section successively, obtain pole piece.
In above-mentioned preparation process, the specification of used pulp of lithium ion battery, the kind of collector, collector, as shown in Table 2 below.
Table 2
2, sem test is carried out to pole piece 1 ~ 5
Carry out sem test to the pole piece 1 ~ 5 obtained, result is respectively as shown in Fig. 2 ~ 7.
In fig. 2, granule auxiliary material and bulky grain major ingredient are and are uniformly distributed, and thus, can be learnt by Fig. 2: each material dispersion in the pulp layer in pole piece 1 very even.
In Fig. 3,4, granule auxiliary material and bulky grain major ingredient are and are uniformly distributed, and thus, can be learnt by Fig. 3 and Fig. 4: each material dispersion in the pulp layer in pole piece 2 very even.
In Figure 5, granule auxiliary material and bulky grain major ingredient are and are uniformly distributed, and thus, can be learnt by Fig. 5: each material dispersion in the pulp layer in pole piece 3 very even.
In figure 6, granule auxiliary material and bulky grain major ingredient are and are uniformly distributed, and thus, can be learnt by Fig. 6: each material dispersion in the pulp layer in pole piece 4 very even.
In the figure 7, granule auxiliary material, namely carbon nano-tube is imbedded in bulky grain major ingredient, can be learnt by Fig. 7: each material dispersion in the pulp layer in pole piece 5 very even.
Two, the electric cycle performance test of flexible-packed battery
By pole piece 1, pole piece 3, pole piece 5 respectively with negative plate, and pole piece 2, pole piece 4 are assembled into flexible-packed battery 1 ~ 5 by the following method successively with positive plate respectively, then all under the condition of 4.4V, and respectively at normal temperature and 45 DEG C testing flexible battery 1 ~ 5 to circulate the capability retention after 800 times, result is as shown in table 3 below.
On the positive plate and negative plate of composition battery, welding conduction lug, forms naked battery core with lithium battery diaphragm winding, then with after aluminum plastic film encapsulation, injects electrolyte, then carry out changing into aging, obtains the thick flexible-packed battery for 32mm × 82mm × 42mm of length and width.
Table 3
Numbering Room temperature cycles 800 capability retention/% 45 DEG C of circulations, 800 capability retention/%
Flexible-packed battery 1 97 93
Flexible-packed battery 2 95 90
Flexible-packed battery 3 94 91
Flexible-packed battery 4 91 91
Flexible-packed battery 5 93 90
Can be learnt by upper table 3: after the pulp of lithium ion battery that the method provided by the application prepares is prepared into corresponding positive plate or negative plate, significantly improve room temperature cycles 800 capability retentions and 45 DEG C of circulations, 800 capability retentions of battery, the cycle life of battery can be significantly improved.
The announcement of book according to the above description, the application those skilled in the art can also carry out suitable change and amendment to above-mentioned execution mode.Therefore, the application is not limited to embodiment disclosed and described above, also should fall in the protection range of claim of the application some modifications and changes of the application.

Claims (10)

1. a preparation method for pulp of lithium ion battery, is characterized in that, comprises following four steps:
(1) major ingredient and auxiliary material are mixed, obtain mixed material I, wherein, described major ingredient comprises active material, described active material is positive electrode active materials or negative active core-shell material, described auxiliary material comprises binding agent and conductive agent, and wherein, described positive electrode active materials is one or more in the transition metal oxide of lithium;
(2) the mixed material I obtained in step (1) is carried out disperseing, extruding, obtain mixed material II;
(3) the mixed material II obtained in step (2) is disperseed, obtain mixed material III;
(4) under vacuum conditions, add solvent in the mixed material III obtained in step (3) and disperse, obtain pulp of lithium ion battery.
2. the preparation method of pulp of lithium ion battery according to claim 1, is characterized in that, in described step (1), the transition metal oxide of described lithium is LiNi xmn 1-xo 2, LiCoO 2, LiNiO 2, LiCo 1-(x+y)ni xmn yo 2, LiCo xni 1-xo 2, LiVPO 4, LiMnO 2, Li 2mnO 4, LiFePO 4, wherein, x, y, x+y are all less than 1.
3. the preparation method of pulp of lithium ion battery according to claim 1, is characterized in that, in described step (1), the total weight of described auxiliary material is 0.5 ~ 20% of the total weight of major ingredient.
4. the preparation method of pulp of lithium ion battery according to claim 1, it is characterized in that, in described step (1), described major ingredient is joined in major ingredient sending cans, conductive agent in auxiliary material, binding agent are joined in premixing tank successively and mixes, then major ingredient and auxiliary material are joined in blanking pipe and mix.
5. the preparation method of pulp of lithium ion battery according to claim 4, it is characterized in that, pressure 1 in described major ingredient sending cans is 10 ~ 80KPa, and the pressure 2 in described premixing tank is 1.03 ~ 3 times of pressure 1, and the pressure 3 in described blanking pipe is 0.03 ~ 0.18MPa.
6. the preparation method of pulp of lithium ion battery according to claim 1, is characterized in that, in described step (2), jitter time is 0.5 ~ 60 minute, and/or extrusion time is 0.5 ~ 60 minute.
7. the preparation method of pulp of lithium ion battery according to claim 1, is characterized in that, in described step (3), jitter time is preferably 0.5 ~ 50 minute.
8. the preparation method of pulp of lithium ion battery according to claim 1, is characterized in that, in described step (4), solvent is one or more in water, heterocycle compound and ketones solvent.
9. the preparation method of pulp of lithium ion battery according to claim 1, is characterized in that, in described step (4), the addition of solvent is 10 ~ 90% of the total weight of major ingredient.
10. the preparation method of pulp of lithium ion battery according to claim 1, is characterized in that, in described step (4), vacuum degree is-0.095 ~-0.001MPa, and/or jitter time is 2 ~ 50 minutes.
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Publication number Priority date Publication date Assignee Title
WO2018036309A1 (en) * 2016-08-25 2018-03-01 宁德时代新能源科技股份有限公司 Positive electrode additive and preparation method therefor, positive electrode plate and secondary lithium ion battery
CN108807890A (en) * 2018-05-24 2018-11-13 天津工业大学 A kind of ternary nano porous nickel vanadium manganese oxide electrode material and preparation method thereof

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CN101393978A (en) * 2007-09-19 2009-03-25 深圳市比克电池有限公司 Pulp for lithium ionic cell electrode and manufacturing method thereof
CN102569733A (en) * 2010-12-21 2012-07-11 比克国际(天津)有限公司 Preparation method for lithium ion battery slurry, as well as battery slurry and lithium ion battery
CN104466090A (en) * 2014-12-16 2015-03-25 江苏华东锂电技术研究院有限公司 Preparation method of battery slurry

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CN101393978A (en) * 2007-09-19 2009-03-25 深圳市比克电池有限公司 Pulp for lithium ionic cell electrode and manufacturing method thereof
CN102569733A (en) * 2010-12-21 2012-07-11 比克国际(天津)有限公司 Preparation method for lithium ion battery slurry, as well as battery slurry and lithium ion battery
CN104466090A (en) * 2014-12-16 2015-03-25 江苏华东锂电技术研究院有限公司 Preparation method of battery slurry

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018036309A1 (en) * 2016-08-25 2018-03-01 宁德时代新能源科技股份有限公司 Positive electrode additive and preparation method therefor, positive electrode plate and secondary lithium ion battery
US10840501B2 (en) 2016-08-25 2020-11-17 Contemporary Amperex Technology Co., Limited Positive electrode additive and preparation method therefor, positive electrode plate and secondary lithium ion battery
CN108807890A (en) * 2018-05-24 2018-11-13 天津工业大学 A kind of ternary nano porous nickel vanadium manganese oxide electrode material and preparation method thereof

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