CN106356556A - Lithium ion power battery with long service life and preparation method thereof - Google Patents

Lithium ion power battery with long service life and preparation method thereof Download PDF

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Publication number
CN106356556A
CN106356556A CN201611103612.9A CN201611103612A CN106356556A CN 106356556 A CN106356556 A CN 106356556A CN 201611103612 A CN201611103612 A CN 201611103612A CN 106356556 A CN106356556 A CN 106356556A
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lithium
service life
long service
battery
ion
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CN106356556B (en
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黄延新
刘国壮
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Guangxi Zhuo Neng New Energy Technology Co Ltd
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Guangxi Zhuo Neng New Energy 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/362—Composites
    • 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
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
    • H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
    • 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
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
    • 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
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • 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
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • 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 invention discloses a lithium ion power battery with long service life. The lithium ion power battery comprises a cathode plate and an anode plate, wherein the cathode plate comprises a cathode current collector and a cathode paste; the cathode paste is arranged on the surface of the cathode current collector, and comprises the following components of 98.65% to 99.18% of lithium nickel manganese cobalt, 0.02% to 0.05% of single-wall carbon nanotube, and 0.8 to 1.3% of polyvinylidene fluoride; the anode plate comprises an anode current collector and an anode paste; the anode paste is arranged on the surface of the anode current collector, and comprises the following components of 97 to 97.4% of graphene and graphite composite material, 1.3 to 1.5% of sodium carboxymethylcellulose, and 1.3 to 1.5% of butadiene styrene rubber. The lithium ion power battery has the advantages that the safety property is high, the passing rate of puncturing experiment is high, and the thermal stability is improved; the charging and discharging rate is large, the gravimetric specific power is large, the circulating property is excellent, and the service life is long. The invention also discloses a preparation method of the lithium ion power battery with the long service life. The preparation method has the advantages that the process is simple, the efficiency is high, the safety is realized, and the operability is strong.

Description

A kind of lithium-ion-power cell of long service life and preparation method thereof
Technical field
The present invention relates to cell art, more particularly, to a kind of lithium-ion-power cell of long service life and its preparation Method.
Background technology
Lithium-ion-power cell is the novel high-energy battery succeeded in developing in 20th century, because it has energy height, cell voltage The advantages of height, operating temperature range width, storage life are long, has been widely used in military and civilian compact electric apparatus.
For lithium-ion-power cell, positive electrode can select trielement composite material.Ternary composite cathode material is with nickel Salt, cobalt salt, manganese salt are raw material, and the ratio of nickel cobalt manganese can adjust according to actual needs, and ternary material makees the battery of positive pole relatively Higher in cobalt acid lithium battery safety.
But, existing lithium-ion-power cell processing characteristics is unstable.Because the humidity to production environment for the ternary material Have high demands, the phenomenon of retrogradation easily occurs after slurry water suction, leads to coated face density unstable, the conforming product rate of production is less than 90%.Meanwhile, the security performance of existing product and high power charging-discharging cycle performance are poor, are embodied in: real in battery acupuncture In testing, percent of pass is low；The heat stability of battery is poor, is susceptible to thermal diffusion after internal short-circuit, leads to phenomenon on fire from explosion；Battery Cycle performance poor, 1c fills 5c and is lowerd in 1000 weeks；Power-performance is low, battery discharge platform as little as 3.6v, and gravimetric specific power is low To 576wh/kg.
Content of the invention
In order to overcome the deficiencies in the prior art, first purpose of the present invention be to provide a kind of lithium of long service life from Sub- electrokinetic cell, the security performance of this battery is high, and acupuncture experiment percent of pass is high, thermally-stabilised enhancing；And charge-discharge magnification is big, weight Specific power is big, and cycle performance is excellent, life-span length.
Second object of the present invention is to provide a kind of preparation method of the lithium-ion-power cell of long service life, stream Journey is simple, and highly effective and safe is workable.
First, the mesh of the present invention employ the following technical solutions realization:
A kind of lithium-ion-power cell of long service life, including positive plate and negative plate；Described positive plate includes positive pole Collector and the anode sizing agent being arranged on described plus plate current-collecting body surface；Described anode sizing agent by percentage by weight with Lower component is prepared from: nickle cobalt lithium manganate 98.65-99.18%；SWCN 0.02-0.05%；Kynoar 0.8- 1.3%；Described negative plate includes negative current collector and is arranged on the cathode size on described negative current collector surface；Described negative pole slurry Material is prepared from by following components in percentage by weight: Graphene and graphite composite material 97-97.4%；Carboxymethyl is fine The plain sodium 1.3-1.5% of dimension；Butadiene-styrene rubber 1.3-1.5%.
Preferably, in described nickle cobalt lithium manganate, the mass ratio of nickel, cobalt and manganese three is 1:1:1；Described Graphene and stone The theoretical gram volume 400-450mah/g of black composite.
Preferably, in described positive plate, the surface density of described anode sizing agent is 220-250g/, and compacted density is 3.45-3.65g/mm3.
Preferably, in described negative plate, the surface density of described cathode size is 83-95g/, and compacted density is 1.45- 1.6g/mm3.
Preferably, described plus plate current-collecting body is aluminium foil；Described negative current collector is Copper Foil.
Preferably, the thickness of described plus plate current-collecting body is 12-16 μm；The thickness of described negative current collector is 8-10 μm.
Second, the mesh of the present invention employ the following technical solutions realization:
A kind of preparation method of the lithium-ion-power cell of long service life, comprises the following steps:
1) prepare positive plate: three nickle cobalt lithium manganates of formula ratio, SWCN and Kynoar are placed in mixing In machine, after mixing uniformly, add the first solvent, continue mixing, obtain anode sizing agent, then disperseed；Then, after dispersion Anode sizing agent be sprayed on the surface of plus plate current-collecting body, dry, compacting, obtain final product positive plate；
2) prepare negative plate: the Graphene of formula ratio and graphite composite material, sodium carboxymethyl cellulose are placed in mixer In, after mixing uniformly, add the second solvent and butadiene-styrene rubber, continue mixing, obtain cathode size, then disperseed；Then, Cathode size after dispersion is sprayed on the surface of negative current collector, dries, compacting, obtain final product negative plate；
3) core, drying: respectively cutting is carried out to described positive plate and described negative plate, in addition take battery diaphragm, then Positive plate after cutting, negative plate and battery diaphragm are wound into battery core；Then, dry；
4) assembling, fluid injection: the battery core after drying is loaded default housing, is then injected into electrolyte, sealing, obtain semi-finished product Battery；
5) post processing: by semi-finished product battery sequentially pass through activation, chemical conversion, aging for the first time, screening, second burin-in process Afterwards, obtain final product described lithium-ion-power cell.
Preferably, in step 1) in, three nickle cobalt lithium manganates of formula ratio, SWCN and Kynoar are placed in In double planetary mixer, under conditions of revolution speed is for 25r/min, knead 40min；After adding the first solvent, in revolution speed Spend for 48r/min, under conditions of rotational velocity is 1700r/min, kneads 90min, obtain anode sizing agent；Anode sizing agent is placed in Rotating speed is in the high speed dispersor of 3500 ± 500r/min, is dispersed to till viscosity reaches 6000 ± 1000mpa.s；Then, Anode sizing agent after dispersion is sprayed on the surface of plus plate current-collecting body so that the surface density of anode sizing agent is 220-250g/, obtains To semi-finished product positive plate；Then, semi-finished product positive plate is dried to water content≤0.1%, anode sizing agent dehydration forms positive powder Material；Finally, rolling is so that the compacted density of positive mix is 3.45-3.65g/mm3, rod is not glued with pole piece, doubling can not be saturating Light, not dry linting are defined, and obtain final product positive plate；
In step 2) in, the Graphene of formula ratio and graphite composite material, sodium carboxymethyl cellulose are placed in double-planet and mix In conjunction machine, under conditions of revolution speed is for 25r/min, knead 40min；After adding the first solvent and butadiene-styrene rubber, in revolution Speed is 48r/min, under conditions of rotational velocity is 1600r/min, kneads 90min, obtains cathode size；Cathode size is put In rotating speed be 3300 ± 500r/min high speed dispersor in, be dispersed to till viscosity reaches 5000 ± 1000mpa.s；Then, Cathode size after dispersion is sprayed on the surface of negative current collector so that the surface density of cathode size is 83-95g/, obtains To semi-finished product negative plate；Then, semi-finished product negative plate is dried to water content≤0.1%, cathode size dehydration forms negative electrode powder Material；Finally, rolling is so that the compacted density of negative pole powder is 1.45-1.6g/mm3, rod is not glued with pole piece, dry linting is not defined, that is, Obtain negative plate；
In step 3) in, battery core is placed in vacuum oven, circulate operation evacuation, inflated with nitrogen and toast these three steps 13-20h, wherein, temperature during baking is 85 ± 10 DEG C, and pressure is (- 40)-(- 90) mpa, dry to the water content of battery core≤ 200ppm；
In step 4) in, it is 20-25 DEG C in temperature, under conditions of -38 DEG C of dew point, the battery core after drying is loaded default Housing；
In step 5) in, semi-finished product battery is placed in after activation 36h in the environment of temperature is 35-45 DEG C, above arrives formation cabinet On be melted into, after terminating, by battery be placed in temperature be 40 ± 5 DEG C in the environment of aging 5 days, then battery is carried out in voltage Resistance screening, the battery core partial volume list charging voltage of spec battery controls in 3.6-3.9v；Then, in the environment of temperature is 40 ± 5 DEG C Aging 5 days；Finally, screened by matching machine, be grouped according to voltage internal resistance class, by spec battery partial volume, then fqc Battery after outward appearance full inspection is qualified, after oqc full inspection is qualified, shipment.
Preferably, described first solvent and described second solvent are n- methyl pyrrolidone or deionized water.First is molten Agent and the second solvent, during drying, can vapor away.
Preferably, described battery diaphragm is non-woven fabrics battery diaphragm, is had ventilative using the battery diaphragm that non-woven fabrics are made The advantage that degree is high, porosity is high, temperature resistance ability is strong, it is indeformable more than 300 DEG C, do not burn.
Compared to existing technology, the beneficial effects of the present invention is:
(1) lithium-ion-power cell of long service life provided by the present invention, positive pole employs new single wall carbon and receives , as conductive agent, the specific surface area of SWCN is big 5 times than multi-walled carbon nano-tubes and lightweight, and purity is higher, leads for mitron More preferably, more preferably, adding proportion is few, can be reduced to 1/10 usage amount, reduce cost for dispersion processing effect for electrical property；With When, negative pole uses new Graphene and graphite composite material, and (Graphene is inserted by olefinic carbon material by distinctive processing technology Between graphitic carbon interlamellar spacing, can effectively Graphene be combined with graphite-phase), Graphene is attached on graphite so that graphite The high gram volume (400-450mah/g) of alkene and excellent electric conductivity are not fully exerted, and solving Graphene in industry can not The difficult problem effectively using on negative pole.In addition, cancelling the conductive black playing electric action in negative pole, active matter ratio is carried Rise, the reduction of surface density in coating process decreases the usage amount of sbr (butadiene-styrene rubber) binding agent, can preferably strengthen conduction Property, and lift active matter ratio and battery core combination property；Meanwhile, because negative pole employs the olefinic carbon material of Gao Rong, the work of positive pole Property thing employs combination property more preferable nickle cobalt lithium manganate (1:1:1) material, and the safety of battery core, multiplying power and circularly enhancing are arrived New height, combination property requires well beyond national standard.
(2) lithium-ion-power cell of long service life provided by the present invention, can pass through " gb/t 31485-2015 Power accumulator safety requirements used for electric vehicle and test method " related request, comprising: overcharge, overdischarge, short circuit, fall Fall, heat, extruding, acupuncture, sea water immersion, temperature cycles, the safety test requirement such as low pressure；The cycle performance 1c of this battery fills 10c put circulation 1500 weeks, capability retention > 80%, gravimetric specific power low for 2880wh/kg；And current battery 1c fills 5c puts Circulation 1000 weeks, capability retention < 80%, gravimetric specific power low for 576wh/kg.
(3) preparation method of the lithium-ion-power cell of long service life provided by the present invention, flow process is simple, efficiently pacifies Entirely, workable.
Specific embodiment
Below, in conjunction with specific embodiment, the present invention is described further:
Graphene selected by the embodiment of the present invention and graphite composite material (olefinic carbon) can obtain from buying on the market, tool Body is the tq series olefinic carbon from Ningbo Guo Yuan new material Science and Technology Ltd..
A kind of lithium-ion-power cell of long service life, including positive plate and negative plate；Described positive plate includes positive pole Collector and the anode sizing agent being arranged on described plus plate current-collecting body surface；Described anode sizing agent by percentage by weight with Lower component is prepared from: nickle cobalt lithium manganate 98.65-99.18%；SWCN 0.02-0.05%；Kynoar 0.8- 1.3%；Described negative plate includes negative current collector and is arranged on the cathode size on described negative current collector surface；Described negative pole slurry Material is prepared from by following components in percentage by weight: Graphene and graphite composite material 97-97.4%；Carboxymethyl is fine The plain sodium 1.3-1.5% of dimension；Butadiene-styrene rubber 1.3-1.5%.
A kind of preparation method of the lithium-ion-power cell of long service life, comprises the following steps:
1) prepare positive plate: three nickle cobalt lithium manganates of formula ratio, SWCN and Kynoar are placed in mixing In machine, after mixing uniformly, add the first solvent, continue mixing, obtain anode sizing agent, then disperseed；Then, after dispersion Anode sizing agent be sprayed on the surface of plus plate current-collecting body, dry, compacting, obtain final product positive plate；
2) prepare negative plate: the Graphene of formula ratio and graphite composite material, sodium carboxymethyl cellulose are placed in mixer In, after mixing uniformly, add the second solvent and butadiene-styrene rubber, continue mixing, obtain cathode size, then disperseed；Then, Cathode size after dispersion is sprayed on the surface of negative current collector, dries, compacting, obtain final product negative plate；
3) core, drying: respectively cutting is carried out to described positive plate and described negative plate, in addition take battery diaphragm, then Positive plate after cutting, negative plate and battery diaphragm are wound into battery core；Then, dry；
4) assembling, fluid injection: the battery core after drying is loaded default housing, is then injected into electrolyte, sealing, obtain semi-finished product Battery；
5) post processing: by semi-finished product battery sequentially pass through activation, chemical conversion, aging for the first time, screening, second burin-in process Afterwards, obtain final product described lithium-ion-power cell.
Embodiment 1
A kind of lithium-ion-power cell of long service life, is prepared from according to following steps successively:
1) prepare positive plate: in percentage by weight nickle cobalt lithium manganate (nickel cobalt manganese ratio 1:1:1) 98.65%, list Wall carbon nano tube 0.05% and Kynoar (pvdf) 1.3% are placed in double planetary mixer, are 25r/min in revolution speed Under conditions of, make 40min；Be subsequently adding solvent, revolution speed be 48r/min, rotational velocity be 1700r/min condition Under, make 90min, make slurry, then disperseed under the rotating speed of 3500 ± 500r/min with high speed dispersor, until viscosity Reach 6000 ± 1000mpa.s；Then, according to the surface density of 220-250g/, anode sizing agent is coated in thickness with spraying equipment Spend for, on 12-16 μm of aluminium foil, drying, making pole piece (water content≤0.1%)；Then roll, make the compacting of active substance Density is 3.45-3.65g/mm3Positive plate, with pole piece glue rod, doubling be unable to printing opacity, not dry linting be defined；
2) prepare negative plate: in percentage by weight olefinic carbon (Graphene and graphite composite material) 97.4% and carboxylic first Base sodium cellulosate (cmc) 1.3% is placed in double planetary mixer, under conditions of revolution speed is for 25r/min, makes 40min； Be subsequently adding solvent and butadiene-styrene rubber (sbr) 1.3%, revolution speed be 48r/min, rotational velocity be 1600r/min bar Under part, make 90min, make slurry, then disperseed under the rotating speed of 3300 ± 500r/min with high speed dispersor, until viscous Degree reaches 5000 ± 1000mpa.s；Then, according to the surface density of 83-95g/, cathode size is coated in thickness with spraying equipment Spend for, on 8-10 μm of Copper Foil, drying, making pole piece (water content≤0.1%)；Then roll, make the compacted density of active matter For 1.45-1.6g/mm3Negative plate, by pole piece glue rod, not dry linting be defined；
3) core, drying: respectively positive plate and negative plate are carried out cutting according to the specification of default housing, separately take non-woven fabrics Then positive plate after cutting, negative plate and battery diaphragm are wound into battery core by battery diaphragm；Then, put into vacuum oven, lead to Cross evacuation, inflated with nitrogen, constant temperature and pressure baking (85 ± 10 DEG C, -40 to -90mpa) three step circulation 13-20h, by the water in core Part content reduces to≤200ppm；
4) assembling, fluid injection: be 20-25 DEG C in ambient temperature, under conditions of -38 DEG C of dew point, battery core entered housing, then And inject electrolyte, sealing；
5) post processing: battery core is activated after 36h in the environment of temperature is for 35-45 DEG C, on be melted into on formation cabinet, After end, by battery core first aging 5 days in the environment of temperature is 40 ± 5 DEG C, then battery core is carried out with voltage internal resistance screening, qualified Battery core partial volume list charging voltage controls in 3.6-3.9v；Then, aging 5 days in the environment of temperature is 40 ± 5 DEG C, then pass through to join Group machine screening battery core becomes different voltage internal resistance class, finally by qualified battery core partial volume, the battery core after qualified for fqc outward appearance full inspection, Through oqc full inspection, qualified after, shipment.
Performance test is carried out to the lithium-ion-power cell of embodiment 1, method of testing is according to " gb/t 31485-2015 electricity Electrical automobile is with power accumulator safety requirements and test method " carry out.Result shows, the lithium-ion-power cell peace of embodiment 1 Full performance is high, absolutely passes through, heat stability is good in acupuncture experiment；Cycle performance is excellent, and 1c fills 10c to be put more than 1500 weeks, Gravimetric power is reached for 2880wh/kg.
Embodiment 2
Embodiment 2 is with the difference of embodiment 1:
Anode sizing agent is prepared from by following components in percentage by weight: nickle cobalt lithium manganate (nickel cobalt manganese ratio 1: 1:1) 99%, SWCN 0.03%, Kynoar (pvdf) 0.97%；
Cathode size is prepared from by following components in percentage by weight: olefinic carbon (Graphene and graphite composite wood Material) 97%, sodium carboxymethyl cellulose (cmc) 1.5%, butadiene-styrene rubber (sbr) 1.5%.
Performance test is carried out to the lithium-ion-power cell of embodiment 2, method of testing is according to " gb/t 31485-2015 electricity Electrical automobile is with power accumulator safety requirements and test method " carry out.Result shows, the lithium-ion-power cell peace of embodiment 2 Full performance is high, absolutely passes through, heat stability is good in acupuncture experiment；Cycle performance is excellent, and 1c fills 10c to be put more than 1500 weeks, Gravimetric power is reached for 2880wh/kg.
Comparative example 1
Comparative example 1 is with the difference of embodiment 1:
Anode sizing agent is prepared from by following components in percentage by weight: nickle cobalt lithium manganate 95.5%, carbon nanometer Pipe (cnt) 1%, electrically conductive graphite 1.5%, Kynoar (pvdf) 2%；
Cathode size is prepared from by following components in percentage by weight: graphite 95.5%, conductive black 1%, Sodium carboxymethyl cellulose (cmc) 1.5%, butadiene-styrene rubber (sbr) 2%.
Performance test is carried out to the lithium-ion-power cell of comparative example 1, method of testing is according to " gb/t 31485-2015 electricity Electrical automobile is with power accumulator safety requirements and test method " carry out.Result shows, the lithium-ion-power cell of comparative example 1, When can not very pass through in acupuncture experiment, and carry out high rate charge-discharge test, the caloric value of battery core is big, and cycle performance is relatively Difference.
It will be apparent to those skilled in the art that can technical scheme as described above and design, make other various Corresponding change and deformation, and all these change and deformation all should belong to the protection domain of the claims in the present invention Within.

Claims (10)

1. a kind of lithium-ion-power cell of long service life is it is characterised in that include positive plate and negative plate；
Described positive plate includes plus plate current-collecting body and is arranged on the anode sizing agent on described plus plate current-collecting body surface；Described anode sizing agent It is prepared from by following components in percentage by weight: nickle cobalt lithium manganate 98.65-99.18%；SWCN 0.02-0.05%；Kynoar 0.8-1.3%；
Described negative plate includes negative current collector and is arranged on the cathode size on described negative current collector surface；Described cathode size It is prepared from by following components in percentage by weight: Graphene and graphite composite material 97-97.4%；Carboxymethyl cellulose Plain sodium 1.3-1.5%；Butadiene-styrene rubber 1.3-1.5%.
2. the lithium-ion-power cell of long service life according to claim 1 is it is characterised in that in described nickel cobalt mangaic acid In lithium, the mass ratio of nickel, cobalt and manganese three is 1:1:1；Described Graphene and the theoretical gram volume 400- of graphite composite material 450mah/g.
3. the lithium-ion-power cell of long service life according to claim 1 is it is characterised in that in described positive plate In, the surface density of described anode sizing agent is 220-250g/, and compacted density is 3.45-3.65g/mm3.
4. the lithium-ion-power cell of long service life according to claim 1 is it is characterised in that in described negative plate In, the surface density of described cathode size is 83-95g/, and compacted density is 1.45-1.6g/mm3.
5. the lithium-ion-power cell of long service life according to claim 1 is it is characterised in that described plus plate current-collecting body For aluminium foil；Described negative current collector is Copper Foil.
6. the lithium-ion-power cell of long service life according to claim 1 is it is characterised in that described plus plate current-collecting body Thickness be 12-16 μm；The thickness of described negative current collector is 8-10 μm.
7. the preparation method of the lithium-ion-power cell of long service life as described in a kind of any one as claim 1-6, its It is characterised by, comprise the following steps:
1) prepare positive plate: three nickle cobalt lithium manganates of formula ratio, SWCN and Kynoar are placed in mixer, After mixing uniformly, add the first solvent, continue mixing, obtain anode sizing agent, then disperseed；Then, dispersion after just Pole slurry is sprayed on the surface of plus plate current-collecting body, dries, and compacting obtains final product positive plate；
2) prepare negative plate: the Graphene of formula ratio and graphite composite material, sodium carboxymethyl cellulose are placed in mixer, mix After refining uniformly, add the second solvent and butadiene-styrene rubber, continue mixing, obtain cathode size, then disperseed；Then, point Cathode size after dissipating is sprayed on the surface of negative current collector, dries, and compacting obtains final product negative plate；
3) core, drying: respectively cutting is carried out to described positive plate and described negative plate, in addition take battery diaphragm, then will cut out Positive plate after cutting, negative plate and battery diaphragm are wound into battery core；Then, dry；
4) assembling, fluid injection: the battery core after drying is loaded default housing, is then injected into electrolyte, sealing, obtain semi-finished product cell Pond；
5) post processing: by semi-finished product battery sequentially pass through activation, chemical conversion, aging for the first time, screening, after second burin-in process, Obtain final product described lithium-ion-power cell.
8. the preparation method of the lithium-ion-power cell of long service life according to claim 7 is it is characterised in that in step In rapid 1), three nickle cobalt lithium manganates of formula ratio, SWCN and Kynoar are placed in double planetary mixer, in public affairs Under conditions of rotary speed is 25r/min, knead 40min；After adding the first solvent, it is 48r/min in revolution speed, rotational velocity Under conditions of 1700r/min, knead 90min, obtain anode sizing agent；It is 3500 ± 500r/min that anode sizing agent is placed in rotating speed High speed dispersor in, be dispersed to till viscosity reaches 6000 ± 1000mpa.s；Then, the anode sizing agent spraying after dispersion So that the surface density of anode sizing agent is 220-250g/ on the surface of plus plate current-collecting body, obtain semi-finished product positive plate；Then, Semi-finished product positive plate is dried to water content≤0.1%, anode sizing agent dehydration forms positive mix；Finally, rolling is so that positive pole The compacted density of powder is 3.45-3.65g/mm3, obtain final product positive plate；
In step 2) in, the Graphene of formula ratio and graphite composite material, sodium carboxymethyl cellulose are placed in double planetary mixer In, under conditions of revolution speed is for 25r/min, knead 40min；After adding the first solvent and butadiene-styrene rubber, in revolution speed For 48r/min, under conditions of rotational velocity is 1600r/min, kneads 90min, obtain cathode size；Cathode size is placed in and turns In the high speed dispersor for 3300 ± 500r/min for the speed, it is dispersed to till viscosity reaches 5000 ± 1000mpa.s；Then, point Cathode size after dissipating is sprayed on the surface of negative current collector so that the surface density of cathode size is 83-95g/, obtains half Finished product negative plate；Then, semi-finished product negative plate is dried to water content≤0.1%, cathode size dehydration forms negative pole powder；? Afterwards, rolling is so that the compacted density of negative pole powder is 1.45-1.6g/mm3, obtain final product negative plate；
In step 3) in, battery core is placed in vacuum oven, circulate operation evacuation, inflated with nitrogen and toast these three steps 13- 20h, wherein, temperature during baking is 85 ± 10 DEG C, and pressure is (- 40)-(- 90) mpa, dry to the water content of battery core≤ 200ppm；
In step 4) in, it is 20-25 DEG C in temperature, under conditions of -38 DEG C of dew point, the battery core after drying is loaded default shell Body；
In step 5) in, semi-finished product battery is placed in after activation 36h in the environment of temperature is 35-45 DEG C, above arrives formation cabinet enterprising Row chemical conversion, after terminating, battery is placed in aging 5 days in the environment of temperature is 40 ± 5 DEG C, then battery is carried out with voltage internal resistance sieve Choosing, the battery core partial volume list charging voltage of spec battery controls in 3.6-3.9v；Then, aging 5 in the environment of temperature is 40 ± 5 DEG C My god.
9. the preparation method of the lithium-ion-power cell of long service life according to claim 7 is it is characterised in that described First solvent and described second solvent are n- methyl pyrrolidone or deionized water.
10. the preparation method of the lithium-ion-power cell of long service life according to claim 7 is it is characterised in that institute Stating battery diaphragm is non-woven fabrics battery diaphragm.
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