CN105932226A - Drying method of battery pole piece - Google Patents

Drying method of battery pole piece Download PDF

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Publication number
CN105932226A
CN105932226A CN201610334686.7A CN201610334686A CN105932226A CN 105932226 A CN105932226 A CN 105932226A CN 201610334686 A CN201610334686 A CN 201610334686A CN 105932226 A CN105932226 A CN 105932226A
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pole piece
drying means
nmp
coating
drying
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CN201610334686.7A
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CN105932226B (en
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赵丰刚
邹玉刚
郭超
彭宁
刘会会
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Times Shangqi Power Battery Co ltd
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Contemporary Amperex Technology Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • B05D3/0263—After-treatment with IR heaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
    • B05D3/0413—Heating with air
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The application relates to the field of lithium ion batteries, in particular to a drying method of a battery pole piece. At least comprises the following steps: coating slurry with N-methyl pyrrolidone as a solvent on the pole piece, and then drying at 50-81 ℃. The method is based on the saturated vapor pressure principle and the explosion limit theory, and realizes the low-temperature drying process by controlling and controlling the slurry and the coating process parameters, so that the production is in a 100% safety state, the efficiency of an NMP recovery system is improved, and the energy consumption of NMP recovery is greatly reduced.

Description

A kind of drying means of battery pole piece
Technical field
The application relates to field of lithium ion battery, specifically, relates to the drying means of a kind of battery pole piece.
Background technology
Safety is the most important thing of production enterprise.In order to control the risk of explosion being coated with in dry run, Ensure that safety in production, country and manufacturing enterprise all take many measures.
In cell production process, NMP gas concentration is to ensure that safety in production or carries the important of product Reference quantity, in order to detect NMP gas concentration in baking oven in real time, Some Enterprises can install online NMP Gas detection alarm device.Online NMP detector is detection based on principle of catalyst combustion dress Put.By the catalytic action of catalyst, NMP gas, in catalyst surface generation flameless combustion, is released Thermal discharge, causes gas sensor resistance to increase, and resistance amplification and NMP gas concentration are directly proportional.NMP The circuit that detector carries can measure resistance amplification, exports corresponding concentration values.
In cell production process, need NMP recovery system is installed.NMP recovery system is by air intake Mouth, heat sink, air outlet form.Fresh air is constantly delivered to baking oven by NMP recovery system, And take the gaseous mixture in baking oven away, so that NMP gas concentration is less than LEL.Take away Gaseous mixture is lowered the temperature through heat sink, and NMP therein reaches saturated concentration and condenses recovery.Pass through Condensed gas of lowering the temperature is discharged through exhaust outlet.Owing to GB GB50493-2009 specifies, air can Combustion gas bulk concentration is not to be exceeded the 25% of its LEL.Although NMP recovery system can effectively drop NMP gas concentration in low baking oven, but NMP concentration the lowest (≤25%) in the gaseous mixture taken away, The organic efficiency causing NMP recovery system is on the low side.At present, enterprise, in order to guarantee safe production, needs The power of NMP recovery system to be improved so that production cost increases.
Although online NMP gas-monitoring alarm can monitor NMP gas concentration in baking oven in real time. But, due to NMP gas being unevenly distributed in baking oven, NMP gas detection alarm It it is the metering system of a kind of one-point measurement.Some region in baking oven, NMP concentration can exceed that LEL, and detector can not effectively find.Increase NMP detector quantity, it is achieved many Point is measured, although can more fully obtain NMP gas concentration in baking oven, judges for safety in production More reliable data is provided.But, increase NMP detector and cause cost to increase.Meanwhile, Online NMP detector fault rate is high, easily occurs that measured deviation affects enterprise to risk Recognition accuracy.Therefore, lithium ion battery produces and yet suffers from potential security risk.
For defect present in prior art, special the application is proposed.
Summary of the invention
Present invention purpose is to propose the drying means of a kind of battery pole piece.
In order to complete the purpose of the application, the technical scheme of employing is:
The application relates to the drying means of a kind of battery pole piece, at least comprises the following steps: on pole piece Coating solvent be the slurry of N-Methyl pyrrolidone, be then dried, be dried temperature be 50～ 81℃。
Preferably, in dry run, in control baking oven, the gas concentration of N-Methyl pyrrolidone is The 50%～98% of N-Methyl pyrrolidone gas burst least concentration.
Preferably, the solid content in described slurry is 1～100%, preferably 30～100%.
Preferably, the width of described coating is 0.1～1000cm, preferably 30～100cm.
Preferably, the surface density of described coating is 1.0～5.0g/cm2, preferably 2.0～5.0g/cm2。
Preferably, the speed of described coating is 0.1～10m/min, preferably 0.1～2m/min.
Preferably, described dry mode includes at least one in hot air drying or infrared drying.
Preferably, the intake of described hot air drying is 1000～16000m3/ hour, preferably 8000～ 10000m3/ hour.
Preferably, described coating method includes being coated with continuously, being intermittently coated with.
Preferably, described battery pole piece is anode pole piece, containing positive-active material in described anode pole piece Material, conductive additive and adhesive, wherein, described positive electrode active materials selected from cobalt acid lithium, lithium titanate, At least one in nickel cobalt aluminum, mangaic acid reason, nickel-cobalt-manganese ternary material, LiFePO4, described conduction adds Add agent selected from SP, KS-6, acetylene black；Described adhesive is selected from PVDF.
The application at least can reach following beneficial effect:
The application is theoretical based on saturated vapor pressure principle and explosion limit, by control regulation and control slurry and coating Technological parameter, it is achieved that low temperature drying technology, is in 100% safe condition so that producing, and Improve NMP recovery system efficiency, greatly reduce NMP and reclaim energy consumption.
Below in conjunction with specific embodiment, the application is expanded on further.Should be understood that these embodiments are only used In explanation the application rather than restriction scope of the present application.
Detailed description of the invention
Present application relates generally to the drying means of a kind of pole piece.In the preparation process of lithium ion battery, Including slurrying, be coated with, be dried, roll-in, cut, the processing procedure such as winding.The proposition of the application novelty A kind of for N-Methyl pyrrolidone as the low temperature drying method of slurry solvent.Wherein, be dried be Refer to the process of the volatilization of the solvent in wet film in certain heater.
N-Methyl pyrrolidone (NMP) is a kind of colourless transparent liquid.Fusing point-24.4 DEG C, boiling point 204 DEG C, flash-point 95 DEG C, under room temperature, difficult volatilization, has good heat stability and chemical stability. The physical and chemical performance good because of it and be widely used in lithium ion battery industry.At present, with NMP The slurry coating making solvent all uses high temperature drying processes, and baking temperature is up to 100～140 DEG C, this temperature The degree flash temperature (95 DEG C) higher than NMP.Under the conditions of existing high temperature drying processes, in slurry NMP become gas, volatilize in a large number, make NMP gas concentration in air constantly raise.If it is dense Degree exceedes LEL, just has the risk that blast occurs, brings massive losses to enterprise.To this end, enterprise Industry, from the angle of safety in production and according to relevant regulations, defines under the baking temperature of 100～140 DEG C, In drying baker, the concentration of NMP air is not to be exceeded the 25% of its LEL.Although this behave is protected Hindered safety, but due in drying baker the concentration of NMP air relatively low, cause NMP recovery system Organic efficiency is on the low side.
In the technical scheme of the application, calculated by explosion limit principle and saturated vapor pressure principle To optimal baking temperature.
In airtight condition, at a certain temperature, it is in, with solid or liquid, the steam balanced each other to be had Some pressure is referred to as vapour pressure.In airtight condition, at a certain temperature, it is in solid or liquid The pressure that the steam balanced each other is had is referred to as vapour pressure.Same substance has different at different temperatures Vapour pressure, and increase along with the rising of temperature.When gaseous pressure increases, and gas molecule can be converted into Liquid, and when gaseous pressure reduces, and fluid molecule in turn translates into gas.
Combustible (fuel gas, steam and dust) and air (or oxygen) must be certain Uniformly mix in concentration range, form premix gas, meet ignition source and just can explode, this concentration model Enclose referred to as explosion limit, or the explosion ratio limit.Explosion limit principle refers to when combustible gas in air When bulk concentration is too high or too low, mixed gas will not be exploded, only when combustible gas concentration is between certain During one scope, mixed gas its is possible to explode.The minimum of this scope is referred to as LEL (LEL), maximum is referred to as UEL (UEL).
Data (being checked in by data) according to LEL, are calculated the saturated vapor pressure of NMP, Computing formula is:
y≈LEL×Patm
Wherein, PatmRepresent an atmospheric pressure.
The computing formula of the corresponding temperature of the LEL of NMP is:
Y=3.89 × 10-8×x4-2.87×10-6×x3+1.61×10-4×x2-2.50×10-3×x +0.0264
Wherein, x is temperature, and y is saturated vapor pressure.
Being calculated by above-mentioned formula, the temperature that NMP LEL is corresponding is 83.15 DEG C.
The application ensures that baking temperature is less than 83.15 DEG C, wherein, in the drying process that baking temperature refers to, The temperature that moisture membrane surface measurement is arrived.In this application, in order to guarantee safe production further, will be dried Maximum temperature be set in 81 DEG C.
Under this baking temperature, it is only necessary in control baking oven, the gas concentration of N-Methyl pyrrolidone is The 50%～98% of N-Methyl pyrrolidone gas burst least concentration.Temperature strip in the application Under part, when the saturated vapor pressure that NMP partial pressure in baking oven is corresponding higher than design temperature, NMP Gas will condense, and therefore the concentration of NMP gas is not over LEL, thus also will not send out Raw blast.Simultaneously as NMP gas concentration increases so that unit air is taken away the amount of NMP and increased Add, thus improve the organic efficiency of NMP recovery system, reached to reduce NMP cost recovery Purpose.
Under the conditions of room temperature to 140 DEG C, the gas concentration of NMP gas burst lower limit is 1.3%, i.e. Control concentration is 1.3% 50%～the 98% of NMP gas.
Slurry in the application is to be prepared by pulping process, pulping process refer to by active material with The powder body material such as conductive additive, adhesive is uniformly distributed technical process in a solvent；Coating process Refer to be applied on collector base material slurry with certain coating method by coating machine, be that slurry exists The manufacturing process of collection liquid surface film forming.Collector can be aluminium foil, Copper Foil.
In the application close by conservative control slurry solid content, tape running speed, coating width, coated face The mode of degree, and ensure that baking temperature is less than temperature corresponding to NMP gas burst lower limit (83.15 DEG C).
As a kind of improvement of the application preparation method, the solid content in slurry is 1～100%, preferably 30～100%.Solid content refers to the quality of above-mentioned all powder body materials and the ratio of slurry gross mass. The too high slurry that is likely to result in of solid content cannot be extruded；Too low be likely to result in dry insufficient.
As a kind of improvement of the application preparation method, the width of coating is 0.1～1000cm, preferably 30～100cm.Width is the effective width of coating.Coating width is crossed conference and is caused pole piece to be dried not fill Point.
As a kind of improvement of the application preparation method, the surface density of coating is 1.0～5.0g/cm2, Preferably 2.0～5.0g/cm2.Surface density is the quality of dried unit are coating, and too high pole piece is done Dry insufficient, too low, make battery core energy density too low.Face to face during consistent in density, solid content gets over Gao Yue Be conducive to being dried.
As a kind of improvement of the application preparation method, the speed of coating is 0.1～10m/min, excellent Select 0.1～2m/min.Tape running speed refers to the length that base material is passed by the unit interval.Excessive velocities is then It is dried insufficient.
As a kind of improvement of the application preparation method, the mode being dried includes hot air drying or infrared dry At least one in dry.
As a kind of improvement of the application preparation method, the intake of hot air drying be 1000～ 16000m3/ hour, preferably 8000～10000m3/ hour.Intake is supplemented in referring to the unit interval Enter the volume of fresh air in baking oven.
As a kind of improvement of the application preparation method, coating method includes being coated with continuously, being intermittently coated with. Coating apparatus employed in the application includes that extrusion coated equipment, spraying equipment, transfer coated set Standby, spin-coating equipment etc..
As a kind of improvement of the application preparation method, battery pole piece is anode pole piece, in anode pole piece Containing positive electrode active materials, conductive additive and adhesive, wherein, positive electrode active materials is selected from cobalt acid At least one in lithium, lithium titanate, nickel cobalt aluminum, mangaic acid reason, nickel-cobalt-manganese ternary material, LiFePO4, Conductive additive is selected from SP, KS-6, acetylene black；Adhesive is selected from PVDF.
The technique using the application is possible not only to ensure production safety, and NMP can be made to reclaim effect Rate is highly improved, and NMP organic efficiency can reach about 75%.Wherein, NMP reclaims effect Rate reclaims NMP mass and reclaims the ratio of front Theoretical Mass in referring to the set time.That reclaims obtains NMP gas concentration be the NMP gas detection alarm by NMP recovery system air inlet position Device measurement obtains.NMP gas detection equipment use herein is based on principle of catalyst combustion.
Embodiment 1
With positive electrode active material plasmogamy anode sizing agent, its formula is as shown in table 1, and coating method uses extruding Coating apparatus is coated with continuously.The parameter being coated with and be dried and condition are as shown in table 2, wherein, and LEL's Gas concentration is 1.3%.Drying mode is two-sided hot air drying；By NMP gas in coating process Detection alarm detection NMP gas concentration, and calculate NMP organic efficiency.Effect data such as table 4 Shown in.
Table 1: anode pole piece formula
Table 2: the parameter being coated with and being dried
Numbering Baking temperature Gas concentration Solid content Coated face density Coating width Tape running speed
1-1 60℃ 30%LEL 70% 30mg/cm2 60cm 1m/min
1-2 70℃ 58%LEL 50% 20mg/cm2 60cm 1m/min
1-3 75℃ 75%LEL 50% 25mg/cm2 30cm 1m/min
1-4 80℃ 98%LEL 60% 26mg/cm2 60cm 1m/min
1-5 80℃ 98%LEL 70% 26mg/cm2 60cm 1m/min
Comparative example
The slurry (as shown in table 1) using embodiment 1 formula is coated and is dried, and difference is, Drying condition is as shown in table 3, and effect data is as shown in table 4.
Table 3: the parameter being coated with and being dried
Numbering Baking temperature Gas concentration Solid content Coated face density Coating width Tape running speed
D1-1 120℃ 20%LEL 70% 30mg/cm2 60cm 35m/min
D1-2 125℃ 23%LEL 50% 20mg/cm2 60cm 25m/min
D1-3 135℃ 24%LEL 50% 25mg/cm2 30cm 25m/min
D1-4 110℃ 20%LEL 60% 26mg/cm2 60cm 25m/min
D1-5 130℃ 20%LEL 70% 26mg/cm2 60cm 25m/min
Note: in comparative example, specifies according to GB GB50493-2009, combustable gas concentration is less than 20 ± 5%LEL. Reason is temperature when being higher than 82 DEG C, and locally NMP gas concentration may exceed LEL, and risk of explosion is the highest. Therefore for ensureing safety in production, need the strict NMP gas concentration controlled under high temperature in baking oven, be allowed to less than 25%.
Table 4: experimental example and the efficacy parameter of comparative example
Numbering NMP organic efficiency Intake
1-1 70% 9000
1-2 80% 8000
1-3 80% 8500
1-4 60% 9000
1-5 75% 9100
D1-1 40% 13000
D1-2 50% 15000
D1-3 50% 14400
D1-4 45% 16000
D1-5 41% 16050
Embodiment 2
With positive electrode active material plasmogamy anode sizing agent, its formula, as shown in the 1-1 in embodiment 1, is coated with Mode uses the interval coating of extrusion coated equipment.The parameter being coated with and be dried and condition are as shown in table 5, Drying mode is infrared drying.Coating process detects NMP by NMP gas detection alarm Gas concentration, effect data is as shown in table 6.
Table 5: the parameter being coated with and being dried
Numbering Baking temperature Gas concentration Solid content Coated face density Coating width Tape running speed
2-1 60℃ 30%LEL 70% 30mg/cm2 60cm 2m/min
2-2 70℃ 55%LEL 58% 20mg/cm2 40cm 4m/min
2-3 75℃ 75%LEL 50% 25mg/cm2 50cm 6m/min
2-4 80℃ 98%LEL 60% 26mg/cm2 70cm 8m/min
2-5 80℃ 96%LEL 70% 26mg/cm2 100cm 10m/min
D2-1 120℃ 22%LEL 70% 30mg/cm2 60cm 50m/min
D2-2 125℃ 23%LEL 58% 20mg/cm2 40cm 50m/min
D2-3 135℃ 24%LEL 50% 25mg/cm2 50cm 45m/min
D2-4 110℃ 22%LEL 60% 26mg/cm2 70cm 45m/min
D2-5 130℃ 25%LEL 70% 26mg/cm2 100cm 45m/min
Table 6: experimental example and the efficacy parameter of comparative example
Numbering NMP organic efficiency Intake
2-1 70% 9200
2-2 80% 8100
2-3 80% 8800
2-4 60% 9300
2-5 75% 9100
D2-1 48% 14000
D2-2 55% 15500
D2-3 53% 15400
D2-4 50% 16100
D2-5 45% 16250
Although the application is open as above with preferred embodiment, but is not for limiting claim, appoint What those skilled in the art, on the premise of conceiving without departing from the application, can make some possible Variation and amendment, the scope that therefore protection domain of the application should be defined with the application claim It is as the criterion.

Claims (10)

1. the drying means of a battery pole piece, it is characterised in that at least comprise the following steps: at pole piece Upper coating solvent is the slurry of N-Methyl pyrrolidone, is then dried, and the temperature being dried is 50～81 DEG C.
Drying means the most according to claim 1, it is characterised in that in dry run, controls In baking oven, the gas concentration of N-Methyl pyrrolidone is that N-Methyl pyrrolidone gas burst lower limit is dense The 50%～98% of degree.
Drying means the most according to claim 1, it is characterised in that the solid content in described slurry It is 1～100%, preferably 30～100%.
Drying means the most according to claim 1, it is characterised in that the width of described coating be 0.1～ 1000cm, preferably 30～100cm.
Drying means the most according to claim 1, it is characterised in that the surface density of described coating is 1.0～5.0g/cm2, preferably 2.0～5.0g/cm2。
Drying means the most according to claim 1, it is characterised in that the speed of described coating be 0.1～ 10m/min, preferably 0.1～2m/min.
Drying means the most according to claim 1, it is characterised in that described dry mode includes At least one in hot air drying or infrared drying.
Drying means the most according to claim 7, it is characterised in that the air intake of described hot air drying Amount is 1000～16000m3/ hour, preferably 8000～10000m3/ hour.
Drying means the most according to claim 1, it is characterised in that described coating method includes even Continuous coating, interval coating.
Drying means the most according to claim 1, it is characterised in that described battery pole piece is just Pole pole piece, containing positive electrode active materials, conductive additive and adhesive in described anode pole piece, its In, described positive electrode active materials is selected from cobalt acid lithium, lithium titanate, nickel cobalt aluminum, mangaic acid reason, nickel cobalt manganese At least one in ternary material, LiFePO4, described conductive additive selected from SP, KS-6, Acetylene black；Described adhesive is selected from PVDF.
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CN108923090A (en) * 2018-05-29 2018-11-30 深圳市德方纳米科技股份有限公司 A method of carbon-coated lithium iron manganese phosphate anode material is prepared from waste lithium iron phosphate battery recycling
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US9991504B2 (en) 2016-01-18 2018-06-05 Grst International Limited Method of preparing cathode for secondary battery
WO2018130122A1 (en) * 2016-01-18 2018-07-19 Grst International Limited Method of preparing cathode for secondary battery
KR20180091092A (en) * 2016-01-18 2018-08-14 쥐알에스티 인터내셔널 리미티드 Method for manufacturing cathode for secondary battery
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CN108630951A (en) * 2017-03-21 2018-10-09 株式会社斯库林集团 Apparatus for coating and coating method
CN108630951B (en) * 2017-03-21 2021-06-08 株式会社斯库林集团 Coating device and coating method
CN109490467A (en) * 2017-09-13 2019-03-19 河北银隆新能源有限公司 The prior-warning device and method for early warning of NMP concentration over-standard in lithium titanate battery coating process
CN108682853A (en) * 2018-04-24 2018-10-19 江西省金锂科技股份有限公司 The preparation method of LiFePO4 and by its lithium iron phosphate positive material obtained
CN108923090A (en) * 2018-05-29 2018-11-30 深圳市德方纳米科技股份有限公司 A method of carbon-coated lithium iron manganese phosphate anode material is prepared from waste lithium iron phosphate battery recycling

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