CN106299485A - High specific energy lithium-ion-power cell and preparation method thereof - Google Patents

High specific energy lithium-ion-power cell and preparation method thereof Download PDF

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CN106299485A
CN106299485A CN201610913214.7A CN201610913214A CN106299485A CN 106299485 A CN106299485 A CN 106299485A CN 201610913214 A CN201610913214 A CN 201610913214A CN 106299485 A CN106299485 A CN 106299485A
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preparation
prepared
negative
specific energy
pole
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沈晓彦
葛国杰
周建新
赵冲
王兴威
唐琛明
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JIANGSU NEW POWER BATTERY AND MATERIAL ENGINEERING TECHNOLOGY RESEARCH CENTRAL Co Ltd
JIANGSU HIGHSTAR BATTERY MANUFACTURING Co Ltd
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JIANGSU NEW POWER BATTERY AND MATERIAL ENGINEERING TECHNOLOGY RESEARCH CENTRAL Co Ltd
JIANGSU HIGHSTAR BATTERY MANUFACTURING Co Ltd
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Priority to CN201610913214.7A priority Critical patent/CN106299485A/en
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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
    • 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
    • H01M4/362—Composites
    • H01M4/366—Composites as layered products
    • 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
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Composite Materials (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a kind of high specific energy lithium-ion-power cell and preparation method thereof, this preparation method includes: anode sizing agent 1) is coated on the tow sides of plus plate current-collecting body, then dries, rolls, divides bar, film-making with prepared positive plate；2) cathode size is coated on the tow sides of negative current collector, then dries, roll, divide bar, film-making with prepared negative plate；3) positive plate, barrier film, negative plate are made pole group, then pole be assembled in box hat and put end slot rolling；4) inject the electrolyte in box hat, then put lid, gland, sealing are fabricated to battery core；5) grading current is used battery core to carry out pre-chemical conversion with prepared high specific energy lithium-ion-power cell.The high specific energy lithium-ion-power cell prepared by the method is had the specific energy of excellence, cycle life, high/low temperature initial capacity, and this preparation method technique and simply, easily operates and then make it be prone to industrialization.

Description

High specific energy lithium-ion-power cell and preparation method thereof
Technical field
The present invention relates to lithium-ion-power cell, in particular it relates to a kind of high specific energy lithium-ion-power cell and preparation thereof Method.
Background technology
The pure electric automobile product sold on current domestic new-energy automobile market is more and more abundanter, but most pure electricity The course continuation mileage of electrical automobile is all below 200 kilometers, and the course continuation mileage pure electric vehicle more than 300 kilometers cans be counted on one's fingers.In view of dynamic Power battery is in ev industry development key effect, and the most each developed country all pays much attention to high specific energy electrokinetic cell and grinds Send out, and the year two thousand twenty battery specific energy developing goal is set to 250-350Wh/kg.
From lithium-ion-power cell high specific energy, high security and development of material industry present situation, use nickelic ternary NCM811 and NCA be positive electrode be important directions from now on, but urgently improve rapid decay, high rate performance difference etc. problem.This Outer NCA material exist hygroscopic, component is unstable and the application deficiencies such as difficulty is big；And NCM811 material exist high rate performance poor, The subject matter such as capacity attenuation is fast and safety is low is urgently to be resolved hurrily.
In terms of high specific energy batteries negative material, silicium cathode material is with its high theoretical capacity (reaching 4200mAh/g), low cost Industrial hot spot is become etc. advantage.But this kind of material is at the high Volumetric expansion of charge and discharge cycles process so that it is cycle life, times The characteristic such as rate, low temperature is affected.
Summary of the invention
It is an object of the invention to provide a kind of high specific energy lithium-ion-power cell and preparation method thereof, prepared by the method High specific energy lithium-ion-power cell have excellence specific energy, cycle life, high/low temperature initial capacity, and this preparation method Technique simply, easily operates and then makes it be prone to industrialization.
To achieve these goals, the invention provides the preparation method of a kind of high specific energy lithium-ion-power cell, including:
1) anode sizing agent is coated on the tow sides of plus plate current-collecting body, then dries, roll, divide bar, film-making to prepare Positive plate；
2) cathode size is coated on the tow sides of negative current collector, then dries, roll, divide bar, film-making to prepare Negative plate；
3) positive plate, barrier film, negative plate are made pole group, then pole be assembled in box hat and put end slot rolling；
4) inject the electrolyte in box hat, then put lid, gland, sealing are fabricated to battery core；
5) grading current is used battery core to carry out pre-chemical conversion with prepared high specific energy lithium-ion-power cell；
Wherein, anode sizing agent contains positive electrode active materials, conductive agent and binding agent and positive electrode active materials, conductive agent and glues Knot agent weight ratio be 96.0-97.5:0.8-2.0:1.5-2.5, positive electrode active materials be doping vario-property NCM811 material and Meet following condition: gram volume >=205mAh/g, particle diameter distribution D50 is 11-15 μm, tap density >=2.2g/cm3, specific surface Amass as 0.25-0.70m2/g；The cathode size of negative plate contains negative active core-shell material, conductive agent and binding agent and negative electrode active material The weight ratio of material, conductive agent and binding agent is 94.0-97.0:0.4-1.6:2.5-5, and negative active core-shell material is high molecular polymer Surface coated Si-C composite material and meet following condition: gram volume >=800mAh/g, tap density >=0.8g/cm3, compacting Density >=1.2g/cm3, specific surface area≤10m2/g。
Present invention also offers a kind of high specific energy lithium-ion-power cell, this high specific energy lithium-ion-power cell is by above-mentioned Preparation method be prepared from.
By technique scheme, the present invention optimizes modified anode and cathode active materials, the lithium ion of preparation by using Battery specific energy up to 300Wh/kg, cycle life >=1500 time ,-20 DEG C of low temperature discharge capacity >=71% initial capacities, 55 DEG C High temperature discharge capacity >=92% initial capacity.Meanwhile, the present invention by being pre-mixed stirring by powder body material, then mediates, finally Finely dispersed method, can make different materials component mix evenly, shorten incorporation time, improve production efficiency.Additionally, this Invention uses the method that grading current is melted in advance, and the SEI film making pole piece be formed is finer and close, stable.Finally, the work of the present invention Skill is to have carried out excellent improvement on the basis of 18650 cylindrical maturation process, and its technique simply, easily operate, easily realizes industry Change.
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 is battery charging and discharging cyclic curve figure (0.2C charging/1C electric discharge) in detection example 1；
Fig. 2 is battery low temperature discharge curve chart at-20 DEG C in detection example 1；
Fig. 3 is battery high temperature discharge curve chart at 55 DEG C in detection example 1.
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 specific energy lithium-ion-power cell, including:
1) anode sizing agent is coated on the tow sides of plus plate current-collecting body, then dries, roll, divide bar, film-making to prepare Positive plate；
2) cathode size is coated on the tow sides of negative current collector, then dries, roll, divide bar, film-making to prepare Negative plate；
3) positive plate, barrier film, negative plate are made pole group, then pole be assembled in box hat and put end slot rolling；
4) inject the electrolyte in box hat, then put lid, gland, sealing are fabricated to battery core；
5) grading current is used battery core to carry out pre-chemical conversion with prepared high specific energy lithium-ion-power cell；
Wherein, anode sizing agent contains positive electrode active materials, conductive agent and binding agent and positive electrode active materials, conductive agent and glues Knot agent weight ratio be 96.0-97.5:0.8-2.0:1.5-2.5, positive electrode active materials be doping vario-property NCM811 material and Meet following condition: gram volume >=205mAh/g, particle diameter distribution D50 is 11-15 μm, tap density >=2.2g/cm3, specific surface Amass as 0.25-0.70m2/g；The cathode size of negative plate contains negative active core-shell material, conductive agent and binding agent and negative electrode active material The weight ratio of material, conductive agent and binding agent is 94.0-97.0:0.4-1.6:2.5-5, and negative active core-shell material is high molecular polymer Surface coated Si-C composite material and meet following condition: gram volume >=800mAh/g, tap density >=0.8g/cm3, compacting Density >=1.2g/cm3, specific surface area≤10m2/g。
In the anode sizing agent of the present invention, the concrete kind of conductive agent and binding agent can select in wide scope, but It is to make the lithium-ion-power cell prepared have more excellent specific energy, cycle life, high/low temperature initial capacity, preferably Ground, in anode sizing agent, conductive agent at least two in acetylene black, Super-P, CNT, Graphene, binding agent is Polyvinylidene fluoride PVDF.
In the cathode size of the present invention, the concrete kind of conductive agent and binding agent can select in wide scope, but It is to make the lithium-ion-power cell prepared have more excellent specific energy, cycle life, high/low temperature initial capacity, preferably Ground, in cathode size, conductive agent at least two in acetylene black, Super-P, graphite agent KS, binding agent is poly- In acrylic acid PAA and/or butadiene-styrene rubber.
In the present invention, the concrete kind of plus plate current-collecting body and negative current collector can select in wide scope, but In order to make the lithium-ion-power cell prepared have more excellent specific energy, cycle life, high/low temperature initial capacity, it is preferable that Plus plate current-collecting body be thickness be the aluminium foil of 10-16 μm, negative current collector is the Copper Foil of 7-11 μm.
In the present invention, the compaction of positive plate can select in wide scope, but in order to make the lithium ion prepared Electrokinetic cell has more excellent specific energy, cycle life, high/low temperature initial capacity, it is preferable that positive plate meets following condition: Compacted density is 3.3-3.5g/cm3, surface density is 239-242g/cm2。
In the present invention, the compaction of negative plate can select in wide scope, but in order to make the lithium ion prepared Electrokinetic cell has more excellent specific energy, cycle life, high/low temperature initial capacity, it is preferable that negative plate meets following condition: Compacted density is 1.5-1.7g/cm3, surface density is 67.5-71.0g/cm2。
In the present invention, the preparation method of anode sizing agent can select in wide scope, but in order to make the lithium for preparing from Sub-electrokinetic cell has more excellent specific energy, cycle life, high/low temperature initial capacity, it is preferable that in step 1) before, preparation Method also includes:
A, under vacuum, stirs positive electrode active materials, conductive agent and binding agent under the rotating speed of 800-1200RPM 30-60min closes pulp material powder body with prepared positive pole；
B, under the vacuum condition of 20-50 DEG C, organic solvent and positive pole are closed pulp material powder body 1200-1500RPM's Stir 60-90min under rotating speed and close slurry mastic 1 with prepared positive pole；
C, under the vacuum condition of 20-50 DEG C, organic solvent and positive pole are closed the slurry mastic 1 rotating speed at 1200-1500RPM Lower stirring 60-90min closes slurry mastic 2 with prepared positive pole；
D, organic solvent is added in batches to positive pole close slurry mastic 2 in, stir, cross 150 mesh screen cloth to obtain positive pole Slurry；
Wherein, close pulp material powder body relative to the positive pole of 3 weight portions, the organic solvent in step b, step c, step d Total amount is 1.9-2.1 weight portion；The weight ratio of the organic solvent in step b, step c, step d is 50-60:20-30:10-30.
In the present invention, the preparation method of cathode size can select in wide scope, but in order to make the lithium for preparing from Sub-electrokinetic cell has more excellent specific energy, cycle life, high/low temperature initial capacity, it is preferable that in step 2) before, preparation Method also includes:
A, under vacuum, stirs negative active core-shell material, conductive agent and binding agent under the rotating speed of 800-1200RPM 30-60min closes pulp material powder body with prepared negative pole；
B, under the vacuum condition of 20-50 DEG C, deionized water and negative pole are closed pulp material powder body 1200-1500RPM's Stir 60-90min under rotating speed and close slurry mastic 1 with prepared negative pole；
C, under the vacuum condition of 20-50 DEG C, deionized water and negative pole are closed the slurry mastic 1 rotating speed at 1200-1500RPM Lower stirring 60-90min closes slurry mastic 2 with prepared negative pole；
D, deionized water is added in batches to negative pole close slurry mastic 2 in, stir, cross 120 mesh screen cloth to obtain positive pole Slurry；
Wherein, close pulp material powder body relative to the negative pole of 1 weight portion, the deionized water in step b, step c, step d Total amount is 1.2-1.4 weight portion；The weight ratio of the deionized water in step b, step c, step d is 50-60:20-30:10-30.
In the present invention, the concrete kind of electrolyte and barrier film can select in wide scope, but in order to make to prepare Lithium-ion-power cell there is more excellent specific energy, cycle life, high/low temperature initial capacity, it is preferable that electrolyte contains LiPF6Ethylene carbonate (EC), Ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC)；Barrier film is that wet method synchronizes double pottery drawn Barrier film.
In the present invention, the concrete steps of pre-chemical conversion can select in wide scope, but in order to make the lithium ion prepared Electrokinetic cell has more excellent specific energy, cycle life, high/low temperature initial capacity, it is preferable that pre-chemical conversion comprises the following steps:
A, first with the electric current constant-current charge 60-90min of 0.049-0.051C, or blanking voltage is 2.5V；
B, again with the electric current constant-current charge 60-90min of 0.09-0.011C, or blanking voltage is 3.0V；
C, then with the electric current constant-current charge 60-90min of 0.019-0.021C, or blanking voltage is 3.7V；
D, finally with the electric current constant-current charge of 0.49-0.51C to 4.2V, then 4.2V constant voltage is charged to 0.02C.
Present invention also offers a kind of high specific energy lithium-ion-power cell, this high specific energy lithium-ion-power cell is by above-mentioned Preparation method be prepared from.
Hereinafter will be described the present invention by embodiment.
Embodiment 1
1) preparation of positive plate is carried out according to the following steps:
A, weigh following solid raw material by mass fraction ratio: modified NCM811 96.4%, SP 1.0%, Graphene 0.6%, PVDF 5,130 2.0%, and each solid raw material is put in the vacuum drying oven of 120 DEG C, batch mixing 240min, vacuum ≤-0.08MPa；Weigh the organic solvent N-crassitude of mass fraction is above four kinds of raw material quality summations 2/3 again Ketone NMP.
B, modification NCM811, Super-P, Graphene, PVDF 5130 are joined in de-airing mixer, de-airing mixer Rotation 900RPM stirs 60min；It is subsequently added into the organic solvent NMP of 60 weight %, de-airing mixer rotation 1500RPM stirring 90min, whipping temp controls below 50 DEG C；Add the organic solvent NMP of 30 weight %, de-airing mixer rotation 1500RPM stirs 90min, and whipping temp controls below 50 DEG C；Finally will remain the organic solvent NMP of 10 weight %, in batches Adding, the viscosity of debugging slurry, range of viscosities is 3000-6000mPa s.
C, the slurry after debugging viscosity is crossed the sieve of 150 mesh, then the anode sizing agent after sieving is coated on thickness 14 μm The tow sides of aluminium foil, dry, roll, divide bar, film-making, and obtaining compacted density is 3.4g/cm3, surface density is 241g/cm2Just Pole piece.
2) preparation of negative plate is carried out according to the following steps:
A, weigh following solid raw material by mass fraction ratio: modified silicon carbon alloy material 95.0%, Super-P 0.5%, KS 0.5%, PAA 4.0%；Weigh that mass fraction is above four kinds of raw material quality summations again 1.2 times go from Sub-water.
B, modified silicon carbon composite, Super-P, KS, PAA are joined in de-airing mixer, de-airing mixer rotation 900RPM stirs 60min；Being subsequently added into the deionized water of 60 weight %, de-airing mixer rotation 1500RPM stirs 90min, stirs Mix temperature to control below 50 DEG C；Adding the deionized water of 30 weight %, de-airing mixer rotation 1500RPM stirs 90min, Whipping temp controls below 50 DEG C；Finally by remaining the deionized water of 10 weight %, it is dividedly in some parts, the viscosity of debugging slurry, Range of viscosities is 2000-4000mPa s.
C, the slurry after debugging viscosity is crossed the sieve of 120 mesh, then the cathode size after sieving is coated on thickness 9 μm copper The tow sides of paper tinsel, dry, roll, divide bar, film-making, and obtaining compacted density is 1.6g/cm3, surface density is 69.0g/cm2Negative Pole piece.
3) shell fluid injection is entered:
By positive plate according to a length of 708mm, a width of 57.5mm, negative plate is according to a length of 774mm, the battery work of a width of 59mm Skill cut-parts, then according to the mode of positive plate, barrier film, negative plate is wound, load in 18650 box hats, put end slot rolling；Finally Inject electrolyte, some lid, gland, sealing.
4) battery is melted in advance
A, first with the electric current constant-current charge 60-90min of 0.05C, or blanking voltage 2.5V；
B, the electric current constant-current charge 60-90min of use 0.1C, or blanking voltage 3.0V；
C, the electric current constant-current charge 60-90min of use 0.2C, or blanking voltage 3.7V；
D, finally it is charged to 0.02C with the electric current constant-current charge of 0.5C to 4.2V, 4.2V constant voltage.
After being melted in advance, after battery normal temperature shelf 7 days, partial volume, warehouse-in.
Detection example 1
1) being detected by the battery prepared in embodiment 1, result shows battery meter as 3.8Ah, and weight is 46.12g, Specific energy is 304.8Wh/kg.
2) battery prepared in embodiment 1 being carried out charge and discharge cycles detection (0.2C charging/1C electric discharge), result is shown in Fig. 1 (abscissa is cycle-index, and vertical coordinate is capability retention (%)).
3) battery prepared in detection embodiment 1 is at-20 DEG C of low temperature discharge capacity, and result is shown in that Fig. 2 (put for accounting for 1C by abscissa Electricity initial capacity ratio (%), vertical coordinate is voltage (mV)).
4) battery prepared in detection embodiment 1 is at 55 DEG C of high temperature discharge capacity, and with reference to Fig. 3, (abscissa is for accounting for 1C electric discharge Initial capacity ratio (%), vertical coordinate is voltage (mV)).
From 1-3, the battery that the present invention prepares has a following performance: cycle life >=1500 time ,-20 DEG C of low temperature discharges Capacity >=71% initial capacity, 55 DEG C of high temperature discharge capacity >=92% initial capacities.
Embodiment 2
High specific energy lithium-ion-power cell is prepared, except that positive pole closes the group of pulp material according to the method for embodiment 1 Dividing and mass ratio is: modified NCM811 96.0%, SP 1.0%, Graphene 1.0%, PVDF 5,130 2.0%, negative pole closes The component of pulp material and mass ratio be: modified silicon carbon composite 95.0%, SP 0.5%, KS 0.5%, PAA 2.0%, Butadiene-styrene rubber 2.0%；The compacted density of positive plate is 3.37g/cm3, surface density is 240.6g/cm2；The compacted density of negative plate For 1.58g/cm3, surface density is 68.7g/cm2。
Battery prepared by detection display present case meets following performance: battery capacity is 3.8Ah, and weight is 46.70g, than Energy is 301.1Wh/kg.Meanwhile, battery prepared by present case also has following performance: cycle life >=1500 time ,-20 DEG C low Temperature discharge capacity >=71% initial capacity, 55 DEG C of high temperature discharge capacity >=92% initial capacities.
Embodiment 3
High specific energy lithium-ion-power cell is prepared, except that positive pole closes the group of pulp material according to the method for embodiment 1 Divide and mass ratio is: modified NCM811 96.5%, acetylene black 0.5%, CNT 0.5%, Graphene 0.5%, PVDF 5130 2.0%, negative pole closes the component of pulp material and mass ratio is: modified silicon carbon composite 95.5%, acetylene black 0.5%, KS 0.5%, PAA 2.0%, butadiene-styrene rubber 2.0%；The compacted density of positive plate is 3.42g/cm3, surface density is 241.4g/ cm2；The compacted density of negative plate is 1.62g/cm3, surface density is 69.3g/cm2。
Battery prepared by detection display present case meets following performance: battery capacity is 3.8Ah, and weight is 45.80g, than Energy is 307.0Wh/kg.Meanwhile, battery prepared by present case also has following performance: cycle life >=1500 time ,-20 DEG C low Temperature discharge capacity >=71% initial capacity, 55 DEG C of high temperature discharge capacity >=92% initial capacities.
Embodiment 4
High specific energy lithium-ion-power cell is prepared, except that positive pole closes the group of pulp material according to the method for embodiment 1 Divide and mass ratio is: modified NCM811 96.5%, SP 1.0%, CNT 1.0%, PVDF 5,130 2.0%, negative pole Close the component of pulp material and mass ratio is: modified silicon carbon composite 95.3%, acetylene black 0.6%, KS 0.6%, PAA 1.5%, butadiene-styrene rubber 2.5%；The compacted density of positive plate is 3.40g/cm3, surface density is 241.5g/cm2；The pressure of negative plate Real density is 1.61g/cm3, surface density is 69.4g/cm2。
Battery prepared by detection display present case meets following performance: battery capacity is 3.8Ah, and weight is 45.77g, than Energy is 307.2Wh/kg.Meanwhile, battery prepared by present case also has following performance: cycle life >=1500 time ,-20 DEG C low Temperature discharge capacity >=71% initial capacity, 55 DEG C of high temperature discharge capacity >=92% initial capacities.
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 specific energy lithium-ion-power cell, it is characterised in that including:
1) anode sizing agent is coated on the tow sides of plus plate current-collecting body, then dries, roll, divide bar, film-making with prepared positive pole Sheet；
2) cathode size is coated on the tow sides of negative current collector, then dries, roll, divide bar, film-making with prepared negative pole Sheet；
3) positive plate, barrier film, negative plate are made pole group, then described pole be assembled in box hat and put end slot rolling；
4) inject the electrolyte in described box hat, then put lid, gland, sealing are fabricated to battery core；
5) grading current is used described battery core to carry out pre-chemical conversion to prepare described high specific energy lithium-ion-power cell；
Wherein, described anode sizing agent contains positive electrode active materials, conductive agent and binding agent and described positive electrode active materials, conductive agent Being 96.0-97.5:0.8-2.0:1.5-2.5 with the weight ratio of binding agent, described positive electrode active materials is doping vario-property NCM811 material and meet following condition: gram volume >=205mAh/g, particle diameter distribution D50 be 11-15 μm, tap density >= 2.2g/cm3, specific surface area be 0.25-0.70m2/g；The cathode size of described negative plate contain negative active core-shell material, conductive agent and The weight ratio of binding agent and described negative active core-shell material, conductive agent and binding agent is 94.0-97.0:0.4-1.6:2.5-5, described Negative active core-shell material is the surface coated Si-C composite material of high molecular polymer and meets following condition: gram volume >= 800mAh/g, tap density >=0.8g/cm3, compacted density >=1.2g/cm3, specific surface area≤10m2/g。
Preparation method the most according to claim 1, wherein, in described anode sizing agent, described conductive agent selected from acetylene black, At least two in Super-P, CNT, Graphene, described binding agent is polyvinylidene fluoride PVDF.
Preparation method the most according to claim 1, wherein, in described cathode size, described conductive agent selected from acetylene black, At least two in Super-P, graphite agent KS, described binding agent is in polyacrylic acid PAA and/or butadiene-styrene rubber.
Preparation method the most according to claim 1, wherein, described plus plate current-collecting body be thickness be the aluminium foil of 10-16 μm, institute State the Copper Foil that negative current collector is 7-11 μm.
5. according to the preparation method described in any one in claim 1-4, wherein, described positive plate meets following condition: pressure Real density is 3.3-3.5g/cm3, surface density is 239-242g/cm2；
Preferably, described negative plate meets following condition: compacted density is 1.5-1.7g/cm3, surface density is 67.5-71.0g/ cm2。
Preparation method the most according to claim 5, wherein, in step 1) before, described preparation method also includes:
A, under vacuum, stirs described positive electrode active materials, conductive agent and binding agent under the rotating speed of 800-1200RPM 30-60min closes pulp material powder body with prepared positive pole；
B, under the vacuum condition of 20-50 DEG C, organic solvent and described positive pole are closed pulp material powder body 1200-1500RPM's Stir 60-90min under rotating speed and close slurry mastic 1 with prepared positive pole；
C, under the vacuum condition of 20-50 DEG C, organic solvent and described positive pole are closed the slurry mastic 1 rotating speed at 1200-1500RPM Lower stirring 60-90min closes slurry mastic 2 with prepared positive pole；
D, being added in batches by organic solvent and close in slurry mastic 2 to described positive pole, the screen cloth stirring, crossing 150 mesh is described to obtain Anode sizing agent；
Wherein, close pulp material powder body relative to the described positive pole of 3 weight portions, the organic solvent in step b, step c, step d Total amount is 1.9-2.1 weight portion；The weight ratio of the organic solvent in step b, step c, step d is 50-60:20-30:10-30.
Preparation method the most according to claim 5, wherein, in step 2) before, described preparation method also includes:
A, under vacuum, stirs described negative active core-shell material, conductive agent and binding agent under the rotating speed of 800-1200RPM 30-60min closes pulp material powder body with prepared negative pole；
B, under the vacuum condition of 20-50 DEG C, deionized water and described negative pole are closed pulp material powder body 1200-1500RPM's Stir 60-90min under rotating speed and close slurry mastic 1 with prepared negative pole；
C, under the vacuum condition of 20-50 DEG C, deionized water and described negative pole are closed the slurry mastic 1 rotating speed at 1200-1500RPM Lower stirring 60-90min closes slurry mastic 2 with prepared negative pole；
D, being added in batches by deionized water and close in slurry mastic 2 to described negative pole, the screen cloth stirring, crossing 120 mesh is described to obtain Anode sizing agent；
Wherein, close pulp material powder body relative to the described negative pole of 1 weight portion, the deionized water in step b, step c, step d Total amount is 1.2-1.4 weight portion；The weight ratio of the deionized water in step b, step c, step d is 50-60:20-30:10-30.
8. according to the preparation method described in claim 6 or 7, wherein, described electrolyte contains LiPF6Ethylene carbonate (EC), carbon Acid methyl ethyl ester (EMC) and dimethyl carbonate (DMC).
9. according to the preparation method described in claim 6 or 7, wherein, barrier film is that wet method synchronizes double ceramic diaphragm drawn.
10. a high specific energy lithium-ion-power cell, it is characterised in that described high specific energy lithium-ion-power cell is wanted by right The preparation method described in any one is asked in 1-9 to be prepared from.
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