CN110190258A - Aqueous composite mortar of Si-C composite material and preparation method thereof, lithium ion battery - Google Patents
Aqueous composite mortar of Si-C composite material and preparation method thereof, lithium ion battery Download PDFInfo
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- CN110190258A CN110190258A CN201910492163.9A CN201910492163A CN110190258A CN 110190258 A CN110190258 A CN 110190258A CN 201910492163 A CN201910492163 A CN 201910492163A CN 110190258 A CN110190258 A CN 110190258A
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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
- 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
- H01M4/364—Composites as mixtures
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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
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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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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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
Abstract
The invention discloses aqueous composite mortars of a kind of Si-C composite material and preparation method thereof, lithium ion battery.It includes the following steps: that Si-C composite material and SP, which are 1. carried out dry powder, stirs to obtain material A；2. material A, water and CMC colloid, which are carried out infiltration, stirs to obtain slurry, solid content is 40~45%；3. after slurry, SBR emulsion and PAA lotion are carried out moderate-speed mixer, deaeration is stood；4. adjusting viscosity is 2000~3000mPas.Aqueous compound binding agent slurry of the invention takes water as a solvent, it is uniformly dispersed, the time of secondary agitation is shortened in its preparation process, binder distributing homogeneity on pole piece can be effectively improved, the effective decomposition for inhibiting electrolyte in cyclic process, more uniform SEI film is formed, coulombic efficiency is high for the first time for thus obtained lithium ion battery, good cycle.
Description
Technical field
The present invention relates to aqueous composite mortars of a kind of Si-C composite material and preparation method thereof, lithium ion battery.
Background technique
In recent years, as increasingly reducing for fossil energy is increasingly serious with environmental problem, lithium ion battery is in electronic vapour
The application of vehicle and energy storage field has been to be concerned by more and more people.Due to lithium ion battery relative to other type cells have compared with
High energy density and power density, it is considered to be current most promising electrical energy storage device.However, existing lithium-ion electric
The energy density and power density in pond are still relatively low, and the following electric car and energy storage system has not yet been reached in safety and cycle life
The requirement of system application.
Graphite negative electrodes material has been widely used in lithium since it is with high cycle efficieny and good cycle performance
The production of ion battery.But its lithium storage content is lower, theoretical specific capacity 372mAh/g, and intercalation potential is electric close to lithium metal
Position, in high power charging-discharging, there are still security risks, therefore develop heat of the novel anode material as the current research field
Point, the research of high-capacity cathode material at present is concentrated mainly on Si, Sn, Sb, Al and Pb etc. can be with the gold of Li electrochemically alloying
Belong to, the amount of the reversible embedding de- Li of such alloy anode is far longer than graphite, such as the theoretical specific capacity of silicon (Si) base negative electrode material
Up to 4200mAh/g, along with the advantages such as its low intercalation potential, low cost are generally considered next-generation negative electrode of lithium ion battery
Material.
The theoretical specific capacity (4200mAh/g) of silicon (Si) base negative electrode material is high, embedding de- lithium platform is convenient, is a kind of ideal
Lithium ion battery high-capacity cathode material.However, in charge and discharge process, i.e., during removal lithium embedded, the volume of silicon materials
It changes greatly (volume expansion is up to 400%), internal stress caused by violent volume change, is easy to cause silicon particle rupture point
Change, so that silicon particle and conductive network is taken off lithium (electrode dusting is peeled off), internal resistance increases, and causes reversible capacity to be decayed rapidly, cyclicity
It can sharp fall.
In lithium ion battery, binder be influence electrode structure stability an important factor for one of.According to decentralized medium
Property, lithium ion battery binder can be divided into using organic solvent as the oiliness binder of dispersing agent and using water as the water of dispersing agent
Property binder.
CN102916190A discloses a kind of aqueous slurry for battery electrode, such as public affairs in the 12nd section of the 4th row of specification
It opens, PVDF can be used for water-based slurry, thus in the chemistry and electrochemistry advantage that keep PVDF.In the 13rd~16 section of specification
Open, mainly by PVDF in aqueous binders use, enables PVDF in aqueous solvent by some ameliorative ways
Lower use, and some advantages of aqueous binders can be inherited, not disclosing slurry group becomes the technology of PAA+SBR+CMC
Scheme.According to common sense in the field it is found that usually under the conditions of aqueous solvent (referring generally to deionized water), PVDF is not dissolved simultaneously, should
It is used using PAA or SBR as the solvent of PVDF in patent application, PVDF is used as laminated dose (disclosing in such as the 13rd section) and makes
With, and general silica-base material (SiOx and graphite composite material) usually only uses aqueous solvent.And it does not disclose SBR cream
Liquid is preparing slurry technique, if it in mixing time longer process, there is demulsifying phenomenon, i.e. too long its of mixing time glues
Property decline, cannot be used well as the effect of binder.
Summary of the invention
The present invention is poor, the Bu Nengying that overcomes SBR emulsion self-strength in the prior art practical the technical issues of solving
The defect of Si matrix based material for high volume expansion provides a kind of aqueous composite mortar of Si-C composite material and its preparation
Method, lithium ion battery.Aqueous compound binding agent slurry of the invention takes water as a solvent, and is uniformly dispersed, contracts in preparation process
The short time of secondary agitation, it can be effectively improved binder distributing homogeneity on pole piece, it is effective to inhibit in cyclic process
The decomposition of electrolyte forms more uniform SEI film, and coulombic efficiency is high for the first time for thus obtained lithium ion battery, cycle performance
It is good.
The present invention solves above-mentioned technical problem by the following technical programs.
The present invention provides a kind of preparation methods of the aqueous composite mortar of Si-C composite material comprising following step:
1) Si-C composite material and conductive black (SP) are subjected to dry powder stirring, obtain material A；
2) material A, water and sodium carboxymethylcellulose colloid are subjected to infiltration stirring, obtain slurry, the solid content of the slurry
It is 40~45%；
3) after the slurry, SBR emulsion (SBR) and polyacrylate emulsion (PAA) being carried out moderate-speed mixer, deaeration,
It stands；
4) adjusting viscosity is 2000~3000mPas.
In the present invention, preferably, the raw material of the aqueous composite mortar of the Si-C composite material is than water by following components
Composition: Si-C composite material, conductive black, sodium carboxymethylcellulose, butadiene-styrene rubber and polyacrylic acid.
In step 1), the Si-C composite material is generally powdered.The type of the Si-C composite material can be ability
Domain is conventional.Currently, commercialized Si-C composite material will mainly aoxidize sub- silicon and nano-silicon respectively with the compound gained of graphite.It is logical
The silicon materials that addition mass fraction is 5%~10% are crossed, the reversible capacity of gained Si-C composite material is up to 450-650mAh/
G, coulombic efficiency, cycle performance, in terms of can partially meet application requirement, in consumer electronics and electric car etc.
It is gradually applied in field.In the present invention, the capacity of the Si-C composite material is generally 450~650mAh/g.
In step 1), the conductive black can be the conductive black of this field conventional commercial.
In step 1), the operation of the dry powder stirring and condition can be conventional for this field, generally stirred using planet rotor
Machine carries out.The revolution speed of the dry powder stirring is preferably 1800~2200r/min, such as 2000r/min.The dry powder stirs
The time mixed is preferably 25~35min, is more preferably 30min.
In step 2), the sodium carboxymethylcellulose colloid is generally sodium carboxymethylcellulose powder and is dissolved in the water to be formed
Colloid.The concentration of the sodium carboxymethylcellulose colloid can be conventional for this field, and preferably 2~5%.
In step 2), the operation of the infiltration stirring and condition can be conventional for this field, generally stirred using planet rotor
Machine carries out.The revolution speed of the infiltration stirring is preferably 500~2000r/min, such as 500r/min, 1000r/min,
1500r/min or 2000r/min.The time of the infiltration stirring is preferably 10~30min, such as 20min.
In step 2), the water can be water commonly used in the art, generally deionized water.The dosage of the water is general
It is determined according to the solid content of slurry.According to common sense in the field it is found that the solid content=(Si-C composite material+conduction charcoal
Black+sodium carboxymethylcellulose+binder)/(Si-C composite material+conductive black+sodium carboxymethylcellulose+binder+deionization
Water).
In step 3), preferably, after the SBR emulsion and polyacrylate emulsion are premixed again with the slurry
Material mixing.The operation of the premix and condition can be conventional for this field.
In step 3), the SBR emulsion can be this field conventional commercial product.The SBR emulsion is consolidated
Content can be conventional for this field, such as 40~60%.In a certain embodiment, the solid content of SBR emulsion can be 50%.
In step 3), the polyacrylate emulsion can be this field conventional commercial product.The polyacrylate emulsion is consolidated
Content can be conventional for this field, such as 20~40%.In a certain embodiment, the solid content of polyacrylate emulsion can be 30%.
In step 3), if SBR emulsion mixing time is longer, there is demulsifying phenomenon, i.e. too long its of mixing time glues
Property decline, cannot use well as binder.Only within the scope of the above-mentioned special process of the present invention, SBR cream just can guarantee
Liquid plays its effect, just can solve technical problem of the invention.
In step 3), the operation of the moderate-speed mixer and condition can be conventional for this field.The revolution speed of the moderate-speed mixer
Spend preferably 900~1300rpm, more preferably 1000~1200rpm.The time of the moderate-speed mixer preferably 3~5min.If stirring
Overlong time is mixed, binder viscosity can decline, and subsequent coating can not carry out, and there is pole piece phenomenons.
In the present invention, the Si-C composite material, the conductive black, the sodium carboxymethylcellulose, the butylbenzene rubber
Glue SBR, the polyacrylic acid PAA mass ratio can be conventional for this field, preferably (85~93): (2~5): (2~4): (2
~4): (2~4).
In the present invention, when the capacity of the Si-C composite material is 650mAh/g, the Si-C composite material described is led
Electric carbon black, the sodium carboxymethylcellulose, the butadiene-styrene rubber, the polyacrylic acid mass ratio be preferably 85: 5: 4: 3:
3。
In the present invention, when the capacity of the Si-C composite material is 450mAh/g, the Si-C composite material described is led
Electric carbon black, the sodium carboxymethylcellulose, the butadiene-styrene rubber, the polyacrylic acid mass ratio can be 93: 2: 2: 1.5:
1.5。
In step 3), the operation of the deaeration and condition can be conventional for this field.The revolution speed of the deaeration is generally
1000~1200r/min, inclined heated plate are generally 1~2min.
In step 3), the operation of the standing and condition can be conventional for this field.The time of the standing is generally 1~
5min, preferably 2min.
In step 4), according to common sense in the field, water regulation system viscosity is generally used.
In step 4), according to common sense in the field, after generally having adjusted system viscosity, vacuum is stood, after bubble removing coating be
It can.
The present invention also provides the aqueous composite mortars of one kind Si-C composite material as made from above-mentioned preparation method.
It is aqueous compound that above-mentioned Si-C composite material is coated with the present invention also provides a kind of lithium ion battery, in negative electrode tab
Slurry.
On the basis of common knowledge of the art, above-mentioned each optimum condition, can any combination to get each preferable reality of the present invention
Example.
The reagents and materials used in the present invention are commercially available.
The positive effect of the present invention is that:
The preparation method of the aqueous composite mortar of Si-C composite material of the present invention is easy, and preparation total time is 45min or so, behaviour
Make convenient controllable, it can be achieved that industrial applications produce；Gained slurry good dispersion.The slurry can be effectively improved adhesive particle
The distributing homogeneity in pole piece can be used for the biggish silicon-carbon cathode system of volume change, restrained effectively electrode material de-
Volumetric expansion in process of intercalation reduces the decomposition of electrolyte, improves in cyclic process pole piece during removal lithium embedded
The stability of the SEI film formed in volume expansion；The cycle performance of lithium ion battery as made from the slurry is good, for the first time coulombic efficiency
It is high.
Detailed description of the invention
Fig. 1 is first charge-discharge curve graph of the slurry under 0.5C multiplying power made from embodiment 1.
Fig. 2 is first charge-discharge curve graph of the slurry under 0.5C multiplying power made from comparative example 1.
Fig. 3 is first charge-discharge curve graph of the slurry under 0.5C multiplying power made from comparative example 2.
Fig. 4 is that the cycle performance using battery made from embodiment 1,1~2 gained slurry of comparative example under 0.5C multiplying power is surveyed
Try curve graph.
Fig. 5 is that the cycle performance using battery made from embodiment 2,3 gained slurry of comparative example under 0.5C multiplying power is tested
Curve graph.
Specific embodiment
The present invention is further illustrated below by the mode of embodiment, but does not therefore limit the present invention to the reality
It applies among a range.In the following examples, the experimental methods for specific conditions are not specified, according to conventional methods and conditions, or according to quotient
The selection of product specification.
Raw material Si-C composite material used by Examples 1 to 3 and comparative example 1,2 will mainly aoxidize sub- silicon and nano-silicon
Respectively with the compound acquisition of graphite, by addition mass fraction be 5%~10% silicon materials, the reversible appearance of Si-C composite material
It measures up to 450-650mAh/g.Above-mentioned raw materials Si-C composite material can be by commercially available.
Embodiment 1
The preparation of the aqueous composite mortar of Si-C composite material:
1) take powdered Si-C composite material (650mAh/g) 1.7g, conductive black 0.1g using planet rotor blender
It carries out dry powder and stirs 30min；Wherein, revolution speed 2000r/min；
2) to through deionized water 1.3g and sodium carboxymethylcellulose colloid 1.6g is added in step (1) mixed dry powder
(content 5%), the infiltration stirring 20min in planet rotor blender obtain uniform just road slurry, control total solid and contain
Amount ratio is 45% or so；Wherein, the revolution speed for infiltrating stirring is 1500r/min；
3) SBR emulsion 0.12g (content 50%) and polypropylene are continuously added into the slurry after infiltrated stirring
The mixed emulsion of yogurt liquid 0.2g (content 30%) carries out middling speed short time mixing and the deaeration 2min (revolution speed of deaeration
For 1000-1200r/min), 2min is stood；During middling speed short time mixing, revolution speed 1200r/min, time 5min；
Si-C composite material, conductive black, sodium carboxymethylcellulose, styrene butadiene rubber sbr, polyacrylic acid PAA mass ratio
For 85:5:4:3:3；
4) slurry after middling speed short time mixing being adjusted into its viscosity to 2000~3000mPas, vacuum standing, gas removal steeps,
Coating.
Embodiment 2
The preparation of the aqueous composite mortar of Si-C composite material:
1) powdered Si-C composite material (capacity 450mAh/g) 3.72g, conductive black 0.08g is taken to turn using planet
Sub- blender carries out dry powder and stirs 25min；Wherein, revolution speed 2200r/min；
2) to through deionized water and sodium carboxymethylcellulose colloid 1.6g (content are added in step (1) mixed dry powder
For 5%), the infiltration stirring 30min in planet rotor blender obtains uniform just road slurry, controls total solid content ratio
Example is 45% or so；Wherein, the revolution speed for infiltrating stirring is 1000r/min；
3) SBR emulsion 0.12g (content 60%) and polypropylene are continuously added into the slurry after infiltrated stirring
The mixed emulsion of yogurt liquid 0.2g (content 30%) carries out middling speed short time mixing and the deaeration 1min (revolution speed of deaeration
For 1000-1200r/min), 1min is stood；During middling speed short time mixing, revolution speed 1200r/min, time 5min；
Si-C composite material, conductive black, sodium carboxymethylcellulose, styrene butadiene rubber sbr, polyacrylic acid PAA mass ratio
For 93:2:2:1.5:1.5.
4) slurry after middling speed short time mixing being adjusted into its viscosity to 2000~3000mPas, vacuum standing, gas removal steeps,
Coating.
Comparative example 1
The preparation of the aqueous composite mortar of Si-C composite material:
1) take powdered Si-C composite material (capacity 650mAh/g) 1.7g, conductive black 0.1g using planet rotor
Blender carries out dry powder and stirs 30min；Wherein, revolution speed 2000r/min；
2) to through deionized water 1.3g and sodium carboxymethylcellulose colloid 1.6g is added in step (1) mixed dry powder
(content 5%), the infiltration stirring 20min in planet rotor blender obtain uniform just road slurry, control solid content ratio
Example is 45% or so；Wherein, the revolution speed for infiltrating stirring is 1500r/min；
3) it is continuously added into the slurry after infiltrated stirring SBR emulsion 0.24g (content 50%), in progress
Fast short time mixing and deaeration 2min (revolution speed of deaeration is 1200r/min), stand 2min；Middling speed short time mixing process
In, revolve 1200r/min, time 5min；
4) slurry after middling speed short time mixing being adjusted into its viscosity to 2000~3000mPas, vacuum standing, gas removal steeps,
Coating.
Comparative example 2
1) take powdered Si-C composite material (capacity 650mAh/g) 1.7g, conductive black 0.1g using planet rotor
Blender carries out dry powder and stirs 30min；Wherein, revolution speed 2000r/min；
2) to through deionized water 1.3g and sodium carboxymethylcellulose colloid 1.6g is added in step (1) mixed dry powder
(content 5%), the infiltration stirring 20min in planet rotor blender obtain uniform just road slurry, control solid content ratio
Example is 45% or so；Wherein, the revolution speed for infiltrating stirring is 1500r/min；
3) polyacrylate emulsion 0.4g (content 30%) is continuously added into the slurry after infiltrated stirring carries out middling speed
Short time mixing and deaeration 2min (revolution speed of deaeration is 1200r/min), stand 2min；During middling speed short time mixing,
Revolve 1200r/min, time 5min；
4) slurry after middling speed short time mixing is adjusted into its viscosity to 2000-3000mPas, vacuum standing, gas removal bubble applies
Cloth.
Comparative example 3
The preparation of the aqueous composite mortar of Si-C composite material:
1) powdered Si-C composite material (capacity 450mAh/g) 3.72g, conductive black 0.08g is taken to turn using planet
Sub- blender carries out dry powder and stirs 35min；Wherein, revolution speed 1800r/min；
2) to through deionized water and sodium carboxymethylcellulose colloid 1.6g (content are added in step (1) mixed dry powder
For 5%), the infiltration stirring 10min in planet rotor blender obtains uniform just road slurry, controls total solid content ratio
Example is 45% or so；Wherein, the revolution speed for infiltrating stirring is 2000r/min；
3) it is continuously added into the slurry after infiltrated stirring SBR emulsion 0.24g (content 50%), in progress
Fast short time mixing and deaeration 2min (revolution speed of deaeration is 1000-1200r/min), stand 2min；Middling speed short time mixing
In the process, revolution speed 1000r/min, time 3min；
Si-C composite material, conductive black, sodium carboxymethylcellulose, styrene butadiene rubber sbr mass ratio be 93:2:2:3.
4) slurry after middling speed short time mixing being adjusted into its viscosity to 2000~3000mPas, vacuum standing, gas removal steeps,
Coating.
Effect example
By the electrochemistry of Si-C composite material composite binder cell size made from Examples 1 to 2, comparative example 1~3
Energy test process is as follows:
Cell size prepared by embodiment 1 is coated on copper foil of affluxion body.With 1.0mol/L LiPF6/ EC+DMC (body
Product than 1:1)+VC+FEC (1%:10%) be electrolyte, Li piece be cathode, the U.S. produce Cellgard-2400 type polypropylene screen be
Diaphragm is assembled into CR2032 type button cell in the glove box full of argon gas.Then in Wuhan City, blue electric electronics share is limited
To material progress cycle performance of battery test is prepared on the CT2001A type battery test system of company's production, with the multiplying power of 0.5C
Button type battery carries out charge and discharge.
Cell size prepared by embodiment 2, comparative example 1~3 is according to method preparation CR2032 type button electricity as shown above
Pond and corresponding test.
Fig. 1 is first charge-discharge curve graph of the slurry under 0.5C multiplying power made from embodiment 1.As shown in Figure 1, it puts for the first time
Capacitance is 843mAh/g, and initial charge capacity is 695.9mAh/g, first charge discharge efficiency 82.5%.Electricity obtained by embodiment 1
The discharge capacity for the first time of the battery performance of pond slurry is obviously improved, while coulombic efficiency improves for the first time.
Fig. 2 is first charge-discharge curve graph of the slurry under 0.5C multiplying power made from comparative example 1.As shown in Figure 2, it puts for the first time
Capacitance is 805mAh/g, and initial charge capacity is 679.5mAh/g, first charge discharge efficiency 84%.
Fig. 3 is first charge-discharge curve graph of the slurry under 0.5C multiplying power made from comparative example 2.From the figure 3, it may be seen that putting for the first time
Capacitance is 827.4mAh/g, and initial charge capacity is 683.2mAh/g, first charge discharge efficiency 82%.
Fig. 4 is that the cycle performance using battery made from embodiment 1,1~2 gained slurry of comparative example under 0.5C multiplying power is surveyed
Try curve graph.As shown in Figure 4, cell size obtained by embodiment 1 can be effectively improved the cycle performance of battery.
Fig. 5 is that the cycle performance using battery made from embodiment 2,3 gained slurry of comparative example under 0.5C multiplying power is tested
Curve graph.As shown in Figure 5, cell size obtained by embodiment 2 can be effectively improved the cycle performance of battery.
The electrochemical data of Examples 1 to 2,1~3 resulting materials of comparative example under 0.5C multiplying power is enumerated such as table 1.
Table 1
Claims (10)
1. a kind of preparation method of the aqueous composite mortar of Si-C composite material, which is characterized in that it includes the following steps:
1) Si-C composite material and conductive black are subjected to dry powder stirring, obtain material A；
2) material A, water and sodium carboxymethylcellulose colloid are subjected to infiltration stirring, obtain slurry, the solid content of the slurry is 40
~45%；
3) after the slurry, SBR emulsion and polyacrylate emulsion being carried out moderate-speed mixer, deaeration is stood；
4) adjusting viscosity is 2000~3000mPas.
2. the preparation method of the aqueous composite mortar of Si-C composite material as described in claim 1, which is characterized in that the silicon-carbon
It is grouped as than water by following groups in the raw material of the aqueous composite mortar of composite material: Si-C composite material, conductive black, carboxylic first
Base sodium cellulosate, butadiene-styrene rubber and polyacrylic acid.
3. the preparation method of the aqueous composite mortar of Si-C composite material as described in claim 1, which is characterized in that the silicon-carbon
The capacity of composite material is 450~650mAh/g；
And/or in step 1), the revolution speed of the dry powder stirring is 1800~2200r/min, such as 2000r/min；It is described
The time of dry powder stirring is 25~35min, such as 30min.
4. the preparation method of the aqueous composite mortar of Si-C composite material as described in claim 1, which is characterized in that step 2)
In, the concentration of the sodium carboxymethylcellulose colloid is 2~5%；
And/or in step 2), the revolution speed of the infiltration stirring is 500~2000r/min；
And/or in step 2), the time of the infiltration stirring is 10~30min.
5. the preparation method of the aqueous composite mortar of Si-C composite material as claimed in claim 4, which is characterized in that step 2)
In, revolution speed 500r/min, 1000r/min, 1500r/min or 2000r/min of the infiltration stirring；
And/or in step 2), the time of the infiltration stirring is 20min.
6. the preparation method of the aqueous composite mortar of Si-C composite material as described in claim 1, which is characterized in that step 3)
In, it is mixed again with the slurry after the SBR emulsion and polyacrylate emulsion are premixed；
And/or in step 3), the solid content of the SBR emulsion is 40~60%；
And/or in step 3), the solid content of the polyacrylate emulsion is 20~40%；
And/or in step 3), the revolution speed of the moderate-speed mixer is 900~1300rpm；
And/or in step 3), the time of the moderate-speed mixer is 3~5min.
7. the preparation method of the aqueous composite mortar of Si-C composite material as claimed in claim 6, which is characterized in that step 3)
In, the solid content of the SBR emulsion is 50%；
And/or in step 3), the solid content of the polyacrylate emulsion is 30%；
And/or in step 3), the revolution speed of the moderate-speed mixer is 1000~1200rpm.
8. the preparation method of the aqueous composite mortar of Si-C composite material as described in claim 1, which is characterized in that the silicon-carbon
Composite material, the conductive black, the sodium carboxymethylcellulose, the butadiene-styrene rubber, the polyacrylic acid mass ratio be
(85~93): (2~5): (2~4): (2~4): (2~4)；
When the capacity of the Si-C composite material is 650mAh/g, the Si-C composite material, the conductive black, the carboxylic
Sodium carboxymethylcellulose pyce, the butadiene-styrene rubber, the polyacrylic acid mass ratio be 85:5:4: 3:3 or 93:2:2:1.5:1.5；
When the capacity of the Si-C composite material is 450mAh/g, the Si-C composite material, the conductive black, the carboxylic
Sodium carboxymethylcellulose pyce, the butadiene-styrene rubber, the polyacrylic acid mass ratio be 93:2:2:4:2.
9. the aqueous composite mortar of Si-C composite material made from a kind of preparation method as described in any one of claims 1 to 8.
10. a kind of lithium ion battery, the aqueous composite mortar of Si-C composite material as claimed in claim 9 is coated in negative electrode tab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910492163.9A CN110190258B (en) | 2019-06-06 | 2019-06-06 | Silicon-carbon composite material water-based composite slurry, preparation method thereof and lithium ion battery |
Applications Claiming Priority (1)
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