CN106328902A - High-capacity lithium-ion power battery for electromobiles and preparation method thereof - Google Patents
High-capacity lithium-ion power battery for electromobiles and preparation method thereof Download PDFInfo
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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
- 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
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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
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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
- H01M10/058—Construction or manufacture
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/386—Silicon or alloys based on silicon
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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
- 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
- H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
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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
- 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
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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
- 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
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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- 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
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a high-capacity lithium-ion power battery for electromobiles and a preparation method thereof. The method comprises the following steps: 1) adding PVDF (polyvinylidene fluoride) 5130 into NMP (N-methylpyrrolidone), stirring to obtain positive pole glue, adding graphene into the positive pole glue, adding a positive pole active substance, adding NMP to regulate the solid content and viscosity, screening, taking out the screened material, spreading the screened material on the front and back surfaces of aluminum foil, and carrying out drying, rolling, stripping and tabletting to obtain the positive pole tablets; 2) adding CMC (carboxymethyl cellulose) and Super P into NMP, stirring to obtain negative pole glue, adding a negative pole active substance into the negative pole glue, adding SBR (styrene butadiene rubber) and NMP to regulate the solid content and viscosity, screening, taking the screened material, and finally, spreading the screened material on the front and back surfaces of copper foil to obtain negative pole tablets; 3) assembling the battery; and 4) carrying out formation. The high-capacity lithium-ion power battery for electromobiles has the advantages of excellent energy density, long service life, high cycle performance and high safety.
Description
Technical field
The present invention relates to lithium-ion-power cell, in particular it relates to a kind of high power capacity lithium ion power used for electric vehicle electricity
Pond and preparation method thereof.
Background technology
Along with China's oil external dependence degree uprises year by year, the situation is tense for energy security, and haze weather takes place frequently, orthodox car
Industrial sustainable development faces the energy and environment challenge, and development new-energy automobile has become whole world common recognition.Current pure electric automobile
Main 18650 lithium-ion-power cells or the LiFePO4 rectangular cell etc. of using, relative 18650 vehicle lithium-ion power batteries,
There is the shortcomings such as energy density is on the low side in LiFePO4 rectangular cell, although and present stage 18650 vehicle lithium-ion power battery energy
Metric density has reached about 200Wh/kg, but battery also exists some problems, example in electric automobile actual application
As:
1, present stage 18650 vehicle lithium-ion power battery energy density reaches about 200Wh/kg, battery in groups after energy
Metric density is reduced to about 170Wh/kg, and for the high mileage that existing electric automobile manufacturer is pursued, energy density is on the low side.
2, after present stage 18650 vehicle lithium-ion power battery circulates 1000 times, inside battery polarization increases, interior resistive
Greatly, there is loss in electrolyte and positive and negative pole material, cause battery to reduce, and the discharge capacity of cell reduces.
Summary of the invention
It is an object of the invention to provide a kind of high power capacity lithium ion power battery used for electromobile and preparation method thereof, pass through
The method prepare high power capacity lithium ion power battery used for electromobile have excellence energy density, long-life cycle performance and
Safety, and this preparation method operation is simple, it is simple to promote.
To achieve these goals, the invention provides a kind of high power capacity lithium ion used for electric vehicle to move
The preparation method of power battery, including:
1) PVDF 5130 is added in NMP (N-Methyl pyrrolidone) and stir with prepared positive pole glue, then Graphene is added
Enter to positive pole glue, be subsequently added into positive active material (modified model NCA), be subsequently adding NMP regulation solid content and viscosity, mistake
Sieve takes and sifts out material, finally spreads upon that the positive and negative of aluminium foil carrying out is dried, rolled, point bar, film-making to be to obtain positive pole by sifting out material
Sheet；
2) CMC, Super P addition NMP will stir with prepared negative pole glue, then (silicon-carbon is combined by negative electrode active material
Material) enter to negative pole glue, it is subsequently added into SBR and NMP regulation solid content and viscosity, then sieves to take and sift out material, finally will
Sift out material and spread upon that the positive and negative of Copper Foil carrying out is dried, rolled, point bar, film-making to be to obtain negative plate；
3) ceramic diaphragm, positive plate and negative plate wound, dress shell, slot rolling, toast, inject electrolyte and seal to obtain
Assemble；
4) assemble is melted into obtain high power capacity lithium ion power battery used for electromobile；
Wherein, positive active material is to first pass through LiOH, NCA ternary precursor to form composite wood with KCl sintering and sintering
Material, then mixes composite with NCA tertiary cathode material；Negative electrode active material be by by Bacterial cellulose, receive
Meter level silicon is scattered in Polyethylene Glycol, then filters and takes filter cake calcining and form；It is melted into and meets following condition: first room temperature (15-
30 DEG C) stand 20-26h, then the electric current charging 100-140min with 0.04-0.06C, then stand 8-12min, then at 40-
Toasting 48-52h at 50 DEG C, last room temperature stands 10-14h.
Present invention also offers a kind of high power capacity lithium ion power battery used for electromobile, this high power capacity lithium used for electric vehicle
Ion battery is prepared by above-mentioned preparation method.
By technique scheme, approach and the problem principle of solution that the present invention passes through are as follows:
1) positive electrode is optimized: current conventional lithium ion power battery anode material uses nickle cobalt lithium manganate, and this material is used
Vehicle lithium-ion power battery in below 3000mAh has good cycle performance, processing characteristics, cost advantage and safety
Can, but there is certain shortcoming, such as processing characteristics for more than 3000mAh vehicle lithium-ion power battery in nickle cobalt lithium manganate
Difference (positive pole coating difficulty baking, positive pole rolls easy part etc.), cycle performance is poor.And the present invention is situated between with fused salt by conventional NCA
The positive active material that matter method grating is prepared has the advantages such as high gram volume, high-pressure solid, long circulation life, is a kind of good
High Energy Density Materials.
2) negative material is optimized: the vehicle lithium-ion power battery negative material of current conventional below 3000mAh uses stone
Ink system material, this material has good processing characteristics, cost advantage and cycle performance, but due to graphite material self gram
Capacity is on the low side, is compacted little so that existing ordinary graphite system cannot meet more than 3000mAh vehicle lithium-ion power battery
Demand.And the Si-C composite material that the present invention provides has high gram volume, high-pressure solid, the characteristic of long circulation life, meet existing
The development trend of stage high-energy-density vehicle lithium-ion power battery, therefore this project uses Si-C composite material as negative pole
Material.
The high power capacity lithium ion used for electric vehicle present invention being prepared by the optimization of positive electrode and negative material
Electrokinetic cell has the advantage that 1) energy density height: high power capacity lithium ion power battery used for electromobile prepared by the present invention
Energy density reaches 260Wh/kg, 0.2C discharge capacity and reaches 3790mAh, 1C discharge capacity and reach 3620mAh, and the energy content of battery is close
Spend more conventional 18650 vehicle lithium-ion power batteries to have a distinct increment.2) long-life cycle performance is high: Gao Rong prepared by the present invention
Amount lithium ion power battery used for electromobile, 0.33C charging 1C electric discharge, circulates 2000 times, capability retention >=80%.
3) product safety performance is high: high power capacity lithium ion power battery used for electromobile prepared by the present invention, fully charged after
Can short circuit, heavily rush, shake, fall etc. under test condition the most on fire, do not explode.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, with following tool
Body embodiment is used for explaining the present invention together, but is not intended that limitation of the present invention.In the accompanying drawings:
Fig. 1 detects high power capacity lithium ion power battery used for electromobile that embodiment in example 11 the prepares bar at 0.2C and 1C
Discharge curve is carried out under part；
Fig. 2 detects the high power capacity lithium ion power battery used for electromobile cycle performance curve that in example 1, embodiment 1 prepares
Figure.
Detailed description of the invention
Hereinafter the detailed description of the invention of the present invention is described in detail.It should be appreciated that described herein specifically
Embodiment is merely to illustrate and explains the present invention, is not limited to the present invention.
The invention provides the preparation method of a kind of high power capacity lithium ion power battery used for electromobile, including:
1) PVDF 5130 is added in NMP (N-Methyl pyrrolidone) and stir with prepared positive pole glue, then Graphene is added
Enter to positive pole glue, be subsequently added into positive active material (modified model NCA), be subsequently adding NMP regulation solid content and viscosity, mistake
Sieve takes and sifts out material, finally spreads upon that the positive and negative of aluminium foil carrying out is dried, rolled, point bar, film-making to be to obtain positive pole by sifting out material
Sheet；
2) CMC, Super P addition NMP will stir with prepared negative pole glue, then (silicon-carbon is combined by negative electrode active material
Material) enter to negative pole glue, it is subsequently added into SBR and NMP regulation solid content and viscosity, then sieves to take and sift out material, finally will
Sift out material and spread upon that the positive and negative of Copper Foil carrying out is dried, rolled, point bar, film-making to be to obtain negative plate；
3) ceramic diaphragm, positive plate and negative plate wound, dress shell, slot rolling, toast, inject electrolyte and seal to obtain
Assemble；
4) assemble is melted into obtain high power capacity lithium ion power battery used for electromobile；
Wherein, positive active material is to first pass through LiOH, NCA ternary precursor to form composite wood with KCl sintering and sintering
Material, then mixes composite with NCA tertiary cathode material；Negative electrode active material be by by Bacterial cellulose, receive
Meter level silicon is scattered in Polyethylene Glycol, then filters and takes filter cake calcining and form；It is melted into and meets following condition: first room temperature (15-
30 DEG C) stand 20-26h, then the electric current charging 100-140min with 0.04-0.06C, then stand 8-12min, then at 40-
Toasting 48-52h at 50 DEG C, last room temperature stands 10-14h.
Step 1 in the present invention) in, the consumption of each material can select in wide scope, but in order to make to prepare
High power capacity lithium ion power battery used for electromobile has more excellent energy density, long-life cycle performance and safety, excellent
Selection of land, in step 1) in, on the basis of the gross weight of PVDF 5130, positive active material and Graphene, positive active material
Consumption is 94-97 weight %, and the consumption of PVDF5130 is 1-3 weight %, and the consumption of Graphene is 1-3 weight %.
Step 2 in the present invention) in, the consumption of each material can select in wide scope, but in order to make to prepare
High power capacity lithium ion power battery used for electromobile has more excellent energy density, long-life cycle performance and safety, excellent
Selection of land, in step 2) in, by negative electrode active material, CMC, SBR, Super P gross weight on the basis of, the use of negative electrode active material
Amount is 93-97 weight %, and the consumption of CMC is 1-3 weight %, and the consumption of SBR is 1.5-3 weight %, and the consumption of Super P is 0-
3 weight %.
Step 1 in the present invention) in, the mixing time in each stage can select in wide scope, but in order to make system
The high power capacity lithium ion power battery used for electromobile obtained has more excellent energy density, long-life cycle performance and safety
Property, it is preferable that in step 1) in, it is 1-2h that PVDF 5130 adds the mixing time after NMP, and Graphene adds to positive pole glue
After mixing time be 1-2h, it is 2-3h that system adds the mixing time after positive active material.
Step 1 in the present invention) in, the mesh number of sieves can select in wide scope, but in order to make to prepare
High power capacity lithium ion power battery used for electromobile has more excellent energy density, long-life cycle performance and safety, excellent
Selection of land, the mesh number of sieves is 200 mesh.
Step 2 in the present invention) in, the mixing time in each stage can select in wide scope, but in order to make system
The high power capacity lithium ion power battery used for electromobile obtained has more excellent energy density, long-life cycle performance and safety
Property, it is preferable that in step 2) in, C, Super P is added the mixing time after NMP is 1-2h, negative electrode active material is entered to
Mixing time after negative pole glue is 4-6h, and being subsequently added into the mixing time after SBR and NMP is 0.5-1.5h.
Step 2 in the present invention) in, the mesh number of sieves can select in wide scope, but in order to make to prepare
High power capacity lithium ion power battery used for electromobile has more excellent energy density, long-life cycle performance and safety, excellent
Selection of land, the mesh number of sieves is 200 mesh.
Meanwhile, in the present invention, the preparation process of positive active material can select in wide scope, but in order to make
The high power capacity lithium ion power battery used for electromobile prepared has more excellent energy density, long-life cycle performance and safety
Property, it is preferable that in step 1) before, preparation method also includes:
A, LiOH, NCA ternary precursor is mixed with KCl, sinter the most for the first time, broken to be sintered for the first time
Thing；
B, carry out first sinter washing, be dried, then carry out double sintering, broken to obtain double sintering thing；
C, carry out mixing to obtain positive active material with double sintering thing by NCA tertiary cathode material.
In the preparation method of above-mentioned positive active material, the consumption of each material can select in wide scope, but
Be make the high power capacity lithium ion power battery used for electromobile prepared have more excellent energy density, long-life cycle performance and
Safety, it is preferable that in step a, the weight ratio of LiOH Yu NCA is 1:2.9-3.1；In step c, NCA tertiary cathode material
Material and double sintering thing weight ratio are 1: 0.9-1.1；
In the preparation method of above-mentioned positive active material, sintering condition can select in wide scope, but makes
The high power capacity lithium ion power battery used for electromobile prepared has more excellent energy density, long-life cycle performance and safety
Property, it is preferable that the temperature of first sintering is 950-1150 DEG C, and the temperature of double sintering is 800-900 DEG C.
Meanwhile, in the present invention, the preparation process of negative electrode active material can select in wide scope, but in order to make
The high power capacity lithium ion power battery used for electromobile prepared has more excellent energy density, long-life cycle performance and safety
Property, it is preferable that in step 2) before, preparation method also includes:
A, by Bacterial cellulose stirring prepare Bacterial cellulose slurry, then nano silicone is divided with Bacterial cellulose slurry
Dissipate in Polyethylene Glycol；
B, mixture filters and takes filter cake carry out calcining to obtain negative electrode active material under conditions of N/H mixed atmosphere
Matter.
In the preparation method of above-mentioned negative electrode active material, dispersion condition can select in wide scope, but makes
The high power capacity lithium ion power battery used for electromobile prepared has more excellent energy density, long-life cycle performance and safety
Property, it is preferable that in step a, dispersion uses the mode of stirring to carry out and mixing time is 14-18h；
Finally, in the preparation method of above-mentioned negative electrode active material, calcination condition can select in wide scope, but
Be make the high power capacity lithium ion power battery used for electromobile prepared have more excellent energy density, long-life cycle performance and
Safety, it is preferable that in stepb, calcining meets following condition: calcining heat is 1350-1450 DEG C, and calcination time is 10-
14h。
Present invention also offers a kind of high power capacity lithium ion power battery used for electromobile, this high power capacity lithium used for electric vehicle
Ion battery is prepared by above-mentioned preparation method.
Hereinafter will be described the present invention by embodiment.
Preparation example 1
The preparation of positive active material (modified model NCA):
1) by after LiOH and NCA ternary precursor mix homogeneously with the ratio of 1:3 and KCl three-dimensional blender tank mix with
To mixture.
2) omnipotent disintegrating machine is used to carry out after above-mentioned compound being sintered at 1000 DEG C, cooled down broken to be burnt for the first time
Knot thing
3) with the first sinter of distilled water wash, filtration；Products obtained therefrom will be filtered dry in exsiccator, then at 850 DEG C
Lower double sintering also uses omnipotent disintegrating machine to carry out crushing to obtain double sintering thing；
4) conventional NCA tertiary cathode material and double sintering thing (are used tertiary cathode material prepared by fused-salt medium method
Material) prepare positive active material according to mass ratio mix homogeneously in the mixed machine of three-dimensional cone of 1:1.
Preparation example 2
The preparation of negative electrode active material (Si-C composite material):
1) take Bacterial cellulose and prepare Bacterial cellulose slurry in the stirring of reaction vessels high speed；
2) Bacterial cellulose slurry and nano silicone are scattered in Polyethylene Glycol, high-speed stirred 16h, filter afterwards, filter
Cake Polyethylene Glycol washs；
3) filter cake after washing is transferred to tube furnace, at 1400 DEG C, calcines 12h under N/H gaseous mixture atmosphere obtain silicon-carbon
Composite.
Embodiment 1
1) (under conditions of not including solvent, in positive plate, each material mass percentage ratio is as follows: positive pole material in the preparation of positive plate
Material 94%, PVDF5130 3%, Graphene 3%): PVDF5130 is added in appropriate NMP, high-speed stirred 1.5h, prepare glue；
The glue that will prepare adds Graphene, high-speed stirred 1.5h；Add positive electrode (modified model NCA) high-speed stirred 2.5h；
Add solvent NMP regulation solid content and viscosity；After stirring cross 200 mesh sieves then by anode sizing agent uniform application at aluminium foil
Positive and negative carrying out is dried, is rolled, the positive plate of band specific dimensions lug is made in point operation such as bar, film-making.
2) (under conditions of not including solvent, in negative plate, each material mass percentage ratio is as follows: negative pole is lived in the preparation of negative plate
Property material 93%, Super P 2%, CMC2.5%, SBR2.5%): CMC is added in appropriate NMP, high-speed stirred 1.5h, system
Obtain glue；Add negative electrode active material (Si-C composite material), high-speed stirred 5h；Add SBR high-speed stirred 1h；Add solvent
NMP regulation solid content and viscosity；After stirring cross 200 mesh sieves then by cathode size uniform application Copper Foil positive and negative also
Carry out drying, roll, the negative plate of band specific dimensions lug is made in point operation such as bar, film-making.
3) battery assembling: above-mentioned positive and negative plate and ceramic diaphragm are wound on Full-automatic machine, dress shell, slot rolling, 80
Inject electrolyte 5.4g by vacuum liquid injecting machine after moisture≤150ppm after DEG C baking 24h, and seal.
4) Battery formation: carry out preliminary filling after the battery normal temperature shelf 24h after sealing, battery is charged with 0.05C electric current
2h, after standing 10min, is placed on battery 50h in 45 DEG C of baking ovens, normal temperature shelf 12h after taking-up, is formed surely on negative plate surface
Fixed SEI film, finally makees the test of discharge and recharge partial volume.
The lithium ion power battery used for electromobile performance that the present embodiment prepares is as follows: 0.2C discharge capacity reaches
3790mAh, 1C discharge capacity reaches 3620mAh.At normal temperatures this battery is carried out 0.33C constant current 0.02C constant voltage to 4.2V, 1C
Constant-current discharge, to 2.5V, circulates 2000 times, and capability retention is 80%.After fully charged can in short circuit, heavily rush, shake, fall
Under test condition the most on fire, do not explode.
Embodiment 2
Carry out preparing lithium ion power battery used for electromobile according to the method for embodiment 1, except that: do not include molten
Under conditions of agent, in positive plate, each material mass percentage ratio is as follows: positive electrode 96%, PVDF5130 2%, Graphene 2%；
Under conditions of not including solvent, in negative plate, each material mass percentage ratio is as follows: negative electrode active material 96%, CMC1.5%,
SBR2.5%.
The lithium ion power battery used for electromobile performance that the present embodiment prepares is as follows: 0.2C discharge capacity reaches
3810mAh, 1C discharge capacity reaches 3630mAh.At normal temperatures this battery is carried out 0.33C constant current 0.02C constant voltage to 4.2V, 1C
Constant-current discharge, to 2.5V, circulates 2000 times, capability retention >=80%.After fully charged can in short circuit, heavily rush, shake, fall
Under test condition the most on fire, do not explode.
Embodiment 3
Carry out preparing lithium ion power battery used for electromobile according to the method for embodiment 1, except that: do not include molten
Under conditions of agent, in positive plate, each material mass percentage ratio is as follows: positive electrode 96%, PVDF5130 2.5%, Graphene
1.5%；Under conditions of not including solvent, in negative plate, each material mass percentage ratio is as follows: negative electrode active material 97%,
CMC1.5%, SBR1.5%.
The lithium ion power battery used for electromobile performance that the present embodiment prepares is as follows: 0.2C discharge capacity reaches
3800mAh, 1C discharge capacity reaches 3630mAh.At normal temperatures this battery is carried out 0.33C constant current 0.02C constant voltage to 4.2V, 1C
Constant-current discharge, to 2.5V, circulates 2000 times, capability retention >=80%.After fully charged can in short circuit, heavily rush, shake, fall
Under test condition the most on fire, do not explode.
Detection example 1
The high power capacity lithium ion power battery used for electromobile that embodiment 1 prepares is put under conditions of 0.2C and 1C
Electro-detection, wherein, testing conditions is: battery to 4.2V, shelves 60min, with 1C constant-current discharge with 1C constant current 0.02C constant-voltage charge
To 2.5V.Concrete outcome is shown in Fig. 1, as seen from the figure, 0.2C discharge capacity be 3790mAh, 1C discharge capacity be 3620mAh.
The high power capacity lithium ion power battery used for electromobile prepared embodiment 2-3 in the same manner is examined
Surveying, result shows that the testing result of the high power capacity lithium ion power battery used for electromobile prepared with embodiment 1 keeps one substantially
Cause.
Detection example 2
The high power capacity lithium ion power battery used for electromobile cycle performance detection that embodiment 1 is prepared, wherein, detector bar
Part is: battery to 4.2V with 0.33C constant current 0.02C constant-voltage charge, is shelved 60min, with 1C constant-current discharge to 2.5V, shelved
60min.Repeat above step, until the discharge capacity of circulation is termination less than life-span during 80% initial capacity.Concrete outcome
Seeing Fig. 2, as seen from the figure, circulating battery 2000 times, capability retention is 80%.
The high power capacity lithium ion power battery used for electromobile prepared embodiment 2-3 in the same manner is examined
Surveying, result shows that the testing result of the high power capacity lithium ion power battery used for electromobile prepared with embodiment 1 keeps one substantially
Cause.
The preferred embodiment of the present invention described in detail above, but, the present invention is not limited in above-mentioned embodiment
Detail, in the technology concept of the present invention, technical scheme can be carried out multiple simple variant, this
A little simple variant belong to protection scope of the present invention.
It is further to note that each the concrete technical characteristic described in above-mentioned detailed description of the invention, at not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to various can
The compound mode of energy illustrates the most separately.
Additionally, combination in any can also be carried out between the various different embodiment of the present invention, as long as it is without prejudice to this
The thought of invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. the preparation method of a high power capacity lithium ion power battery used for electromobile, it is characterised in that including:
1) PVDF 5130 is added in NMP (N-Methyl pyrrolidone) and stir with prepared positive pole glue, then Graphene is added extremely
In described positive pole glue, it is subsequently added into positive active material (modified model NCA), is subsequently adding NMP regulation solid content and viscosity, mistake
Sieve takes and sifts out material, finally the described material that sifts out is spread upon the positive and negative of aluminium foil carrying out is dried, rolled, point bar, film-making to be to obtain
Positive plate；
2) will CMC, Super P addition NMP stir with prepared negative pole glue, then by negative electrode active material (Si-C composite material)
Enter to described negative pole glue, be subsequently added into SBR and NMP regulation solid content and viscosity, then sieve to take and sift out material, finally by institute
State and sift out material and spread upon that the positive and negative of Copper Foil carrying out is dried, rolled, point bar, film-making to be to obtain negative plate；
3) ceramic diaphragm, described positive plate and negative plate wound, dress shell, slot rolling, toast, inject electrolyte and seal to obtain
Assemble；
4) described assemble is melted into obtain described high power capacity lithium ion power battery used for electromobile；
Wherein, described positive active material is to first pass through LiOH, NCA ternary precursor to form composite wood with KCl sintering and sintering
Material, then mixes described composite with NCA tertiary cathode material；Described negative electrode active material is by antibacterial is fine
Dimension element, nano silicone are scattered in Polyethylene Glycol, then filter and take filter cake calcining and form；Described chemical conversion meets following condition:
First room temperature (15-30 DEG C) stands 20-26h, then the electric current charging 100-140min with 0.04-0.06C, then stands 8-
12min, then toasts 48-52h at 40-50 DEG C, and last room temperature stands 10-14h.
Preparation method the most according to claim 1, wherein, in step 1) in, with described PVDF 5130, positive electrode active material
On the basis of the gross weight of matter and Graphene, the consumption of described positive active material is 94-97 weight %, the use of described PVDF5130
Amount is 1-3 weight %, and the consumption of described Graphene is 1-3 weight %.
Preparation method the most according to claim 1, wherein, in step 2) in, with described negative electrode active material, CMC, SBR,
On the basis of the gross weight of Super P, the consumption of described negative electrode active material is 93-97 weight %, and the consumption of described CMC is 1-3
Weight %, the consumption of described SBR is 1.5-3 weight %, and the consumption of described Super P is 0-3 weight %.
4. according to the preparation method described in any one in claim 1-3, wherein, in step 1) in, described PVDF 5130 adds
Entering the mixing time after NMP is 1-2h, and the mixing time that described Graphene adds to described positive pole glue is 1-2h, and system adds
Entering the mixing time after described positive active material is 2-3h；
Preferably, the mesh number of sieves is 200 mesh.
5. according to the preparation method described in any one in claim 1-3, wherein, in step 2) in, by described C, Super P
Adding the mixing time after NMP is 1-2h, and the mixing time entered by described negative electrode active material to described negative pole glue is 4-
6h, being subsequently added into the mixing time after SBR and NMP is 0.5-1.5h；
Preferably, the mesh number of sieves is 200 mesh.
6. according to the preparation method described in any one in claim 1-3, wherein, in step 1) before, described preparation method
Also include:
A, LiOH, NCA ternary precursor is mixed with KCl, sinter the most for the first time, broken to obtain first sinter；
B, carry out described first sinter washing, be dried, then carry out double sintering, broken to obtain double sintering thing；
C, carry out mixing to obtain described positive active material with described double sintering thing by NCA tertiary cathode material.
Preparation method the most according to claim 6, wherein, in step a, the weight ratio of described LiOH Yu NCA is 1:
2.9-3.1；In step c, described NCA tertiary cathode material and double sintering thing weight ratio are 1:0.9-1.1；
Preferably, the temperature of described first sintering is 950-1150 DEG C, and the temperature of described double sintering is 800-900 DEG C.
8. according to the preparation method described in any one in claim 1-3, wherein, in step 2) before, described preparation method
Also include:
A, by Bacterial cellulose stirring prepare Bacterial cellulose slurry, then nano silicone is divided with described Bacterial cellulose slurry
Dissipate in Polyethylene Glycol；
B, mixture filters and takes filter cake carry out calcining to obtain described negative electrode active material under conditions of N/H mixed atmosphere
Matter.
Preparation method the most according to claim 8, wherein, in step a, described dispersion use stirring mode carry out and
Mixing time is 14-18h；
Preferably, in stepb, described calcining meets following condition: calcining heat is 1350-1450 DEG C, and calcination time is 10-
14h。
10. a high power capacity lithium ion power battery used for electromobile, it is characterised in that described high power capacity lithium used for electric vehicle from
Sub-electrokinetic cell is prepared by the preparation method described in any one in claim 1-9.
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