CN109830658A - A kind of negative electrode slurry, preparation method and lithium ion battery - Google Patents
A kind of negative electrode slurry, preparation method and lithium ion battery Download PDFInfo
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- CN109830658A CN109830658A CN201910034375.2A CN201910034375A CN109830658A CN 109830658 A CN109830658 A CN 109830658A CN 201910034375 A CN201910034375 A CN 201910034375A CN 109830658 A CN109830658 A CN 109830658A
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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 present invention relates to a kind of negative electrode slurry and preparation methods.The negative electrode slurry, in parts by weight, the negative electrode slurry include: 100 parts by weight of negative electrode active carbon material；0.5~2 parts by weight of conductive agent；1~5 parts by weight of urea；0.5~2 parts by weight of binder；1~1.5 parts by weight of thickener；With 110~125 parts by weight of water.Negative electrode slurry of the invention can be applied on thinner collector substrate, and not influence coating efficiency, therefore while reducing the weight of substrate, moreover it is possible to coating efficiency be improved, it is possible thereby to be applied to industrial production.
Description
Technical field
The present invention relates to field of lithium ion battery, in particular to a kind of negative electrode slurry and preparation method.
Background technique
With under the demand of market Energy density gradually promoted, reduce single battery core weight, the thinner copper foil of use
Substrate has been necessary means.
In the case where at present in the industry using thickness no more than 10 μm of copper foil base materials, in cathode coating baking process, water
Divide evaporation generally by certain temperature, the wind speed drying of certain frequency.Since copper foil thermal conductivity itself is good, water evaporation rate compared with
Fastly, and can be more preferable compared with inter-coat area close to blank space thermal conductivity, edge pole piece often occurs dry and cracked.If using thinner
Copper foil base material, then when temperature is slightly higher in an oven, wind frequency is slightly larger, pole piece is easier to crack in baking process.Based on
Upper reason, cathode foil thickness used at present stop at 8 μm.If necessary to be coated on thinner copper foil base material, then
Drying effect can only be realized by reducing temperature, wind frequency and coating speed, and this efficiency is very low, can not carry out industry
Change.
It is therefore desirable to provide a kind of negative electrode slurry can not only be coated on thinner copper foil, but also keep coating can be with simultaneously
Efficiently and reliably carry out.
Summary of the invention
In view of this, the main purpose of the present invention is to provide one kind to be efficiently coated on thin copper foil base material
Preferable negative electrode slurry of effect and preparation method thereof simultaneously.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
According to the first aspect of the invention, the present invention provides a kind of negative electrode slurries, in parts by weight, the negative electrode slurry
Include:
According to a kind of embodiment, the parts by weight of the urea are preferably 2~3 parts by weight.
According to a kind of embodiment, the thickener is sodium carboxymethylcellulose, and the conductive agent is selected from Super-P, carbon
At least one of nanotube, Ks-6, the negative electrode active carbon material are graphite or the graphite for mixing silicon carbon material, the bonding
Agent is polyacrylic acid or butadiene-styrene rubber.Preferably, the conductive agent is Super-P.
The negative electrode active carbon material can be graphite；Or the graphite mixed with certain proportion silicon carbon material, for example,
With graphite poidometer, mixed with the carbon silicon materials of 20wt% or less (such as 5~20wt%).
According to a kind of embodiment, when using graphite as negative electrode active material, the binder is preferably butadiene-styrene rubber.
According to another embodiment, when using the graphite mixed with carbon silicon materials as negative electrode active material, the bonding
Agent is preferably polyacrylic acid.
According to the second aspect of the invention, the present invention provides the systems of the negative electrode slurry described according to a first aspect of the present invention
Preparation Method, comprising:
A) water of the thickener of 1~1.5 parts by weight and 100 parts by weight is mixed to get the first mixture；
B) conductive agent of the negative electrode active carbon material of 100 parts by weight and 0.5~2 parts by weight is mixed to get the second mixing
Object；
C) the first mixture, second mixture and 6~10 weight for preparing step a) described in 40~60 parts by weight
The water of part is mixed to get third mixture；
D) the step a) is added into third mixture and prepares remaining first mixture, 6~10 parts by weight
The urea of water and 1~5 parts by weight obtains the 4th mixture；
E) binder of 1.5~2.5 parts by weight, the 4th mixture are mixed to get negative electrode slurry.
According to a kind of embodiment, the parts by weight of the urea are preferably 2~3 parts by weight.
The thickener, conductive agent, negative electrode active carbon material, binder are as defined above.
According to a kind of embodiment, step a)~e) in mixing carried out using mechanical stirring or high speed disperser.
When using mechanical stirring, stirring rate can be 10~30rpm.When using high speed disperser, high speed dispersion head
Revolving speed can be 500rpm~2500rpm.Those skilled in the art select suitable agitating mode according to specific needs and stir
Mix degree.
It according to the third aspect of the invention we, include negative electrode collector and the negative electrode slurry in gold the present invention provides one kind
Belong to the cathode of the coating formed on foil.
The metal foil is usually copper foil, is also possible to other suitable metal foils.
According to the fourth aspect of the invention, the present invention provides it is a kind of include the lithium ion battery formed by the cathode.
Negative electrode slurry of the invention is coating the properties such as viscosity and the uniformity of slurry by the way that a certain amount of urea is added
Middle holding is stablized, it is thus possible to is coated on thinner collector substrate in the case where not reducing coating efficiency, without drawing
It plays the cracking of coating or causes collector substrate damage.
Therefore, negative electrode slurry of the invention makes it possible the use of thinner collector under original coating processes, and
Due to reducing the weight and thickness of substrate, to improve battery energy density, the weight for alleviating battery reduces battery
Volume.
Detailed description of the invention
Fig. 1 is the viscosity test results of test case 1；
Fig. 2 is the photo after the negative electrode slurry coating of embodiment preparation in test case 3；
Fig. 3 is the photo after the negative electrode slurry coating of comparative example preparation in test case 3；
Fig. 4 is 100 times of microphoto after the negative electrode slurry coating of embodiment preparation in test case 3；
Fig. 5 is 100 times of microphoto after the negative electrode slurry coating of comparative example preparation in test case 3；
Fig. 6 is the peel strength result in test case 4 after negative electrode slurry coating.
Specific embodiment
The present invention is further described in detail below with reference to the accompanying drawings and embodiments.It should be appreciated that mentioned herein
Embodiment is only used to explain the present invention, is not intended to limit the present invention.In addition, embodiment provided below is for implementing
Section Example of the invention, rather than provide and implement whole embodiments of the invention, in the absence of conflict, the present invention is implemented
Example record technical solution can mode in any combination implement.
It should be noted that term involved in this paper " first second third the 4th " be only to distinguish similar pair
As not representing the particular sorted for object, it is possible to understand that ground, " first second third the 4th " can in the case where permission
To exchange specific sequence or precedence or carry out simultaneously so that embodiments of the present invention described herein can in addition to
Sequence other than those of being described herein is implemented.
Such as in the method for preparing negative electrode slurry of the invention, step a) and step b) can in any order or simultaneously into
Row.Specific sequence and deformation scheme are that those skilled in the art are confirmable according to actual needs.
Embodiment
The preparation of negative electrode slurry (addition urea)
Step 1) mixes 0.75kg sodium carboxymethylcellulose and 50kg deionized water, carries out first into 60L adhesive supplier
Gluing, the specific method is as follows: being firstly added 50kg deionized water, 0.75kg sodium carboxymethylcellulose is added, in the revolution of 25rpm
Under mixing speed, under the dispersion revolving speed of 2100rpm, stir 180 minutes；
Step 2) mixes 50kg graphite and 0.5kg Super-P, and the specific method is as follows: adding first into 100L agitator tank
Enter 20kg graphite, add Super-P, is stirred 20 minutes under the revolution mixing speed of 20rpm；Then, it is added remaining
30kg graphite stirs 20 minutes under the revolution mixing speed of 20rpm.
Step 3) takes mixture obtained in 30kg step 1) to be added into mixture made from step 2), adds
4.8kg deionized water under the dispersion revolving speed of 800rpm, stirs 60 minutes under the revolution mixing speed of 25rpm.
Mixture obtained in 20.75kg step 1) is added into mixture made from step 3) step 4), then plus
Enter the deionized water of 3.2kg, while addition 1.2kg urea is added, under the revolution mixing speed of 25rpm, in point of 1200rpm
It dissipates under revolving speed, stirs 90 minutes.
The butadiene-styrene rubber of 1kg parts by weight is added into mixture made from step 4) step 5), stirs in the revolution of 25rpm
It mixes under speed, under the dispersion revolving speed of 1000rpm, stirs 60 minutes, negative electrode slurry is made.
Comparative example
The preparation of negative electrode slurry (not adding urea)
Other than not using urea in 1 step 4) of embodiment, negative electrode slurry is prepared in a manner of with embodiment 1.
Test case 1
Viscosity test
0h, 2h, the viscosity test for 24 hours, after 48h are carried out to the negative electrode slurry of the preparation of embodiment and comparative example respectively.
As a result as shown in Fig. 1.
The result shows that viscosity when adding 24 hours, 48 hours of the negative electrode slurry of urea preparation is basicly stable.
Test case 2
Stability test
Solid content after carrying out 48h to the negative electrode slurry of the preparation of embodiment and comparative example respectively is tested.
As a result as shown in table 1 below:
| Solid content variation | Remarks | |
| Embodiment | 0.35% | Add urea |
| Comparative example | 0.2% | Do not add urea |
The result shows that solid content when addition urea and 48 hours of not urea-containing negative electrode slurry is in 1%, i.e.,
Do not occur particle agglomeration phenomenon.
Test case 3
Cracking situation is estimated after being coated with negative electrode slurry
The negative electrode slurry of the preparation of embodiment and comparative example is coated on 6 μ m-thick copper foil base materials respectively, from head to
Four section oven temperatures of tail are respectively at 88 DEG C, 95 DEG C, 95 DEG C, 92 DEG C, are respectively 26Hz, 29Hz, 32Hz, 30Hz in wind frequency
Under, single side coated weight 110g/m2, under conditions of coating speed is 7m/min and 5m/min, observe its situation that cracks；After shutdown,
To tape transport is stopped in baking oven in above-mentioned 2 kinds of negative electrode slurry coating process, 10min baking is carried out according to above-mentioned oven conditions, is seen
Examine its situation that cracks.
The result that cracks is as shown in table 2 below:
It is shown in the negative electrode slurry of embodiment and comparative example with the photo that the rate of 5m/min is coated with the cathode to be formed
In Fig. 2 and Fig. 3, the microphoto (100 times of amplification) of the coating of embodiment and comparative example is shown in Fig. 4 and Fig. 5.
The cathode light that the negative electrode slurry prepared in the above embodiments shown in Fig. 2 it can be seen from Fig. 2 and Fig. 3 coats
Cunning is seamless, the cathode limbus drum side cracking that the negative electrode slurry prepared in comparative example shown in Fig. 3 coats.By Fig. 4 and Fig. 5
As can be seen that the slurry for being not added with the comparative example preparation of urea occurs obviously cracking after application.
Test case 4
Peel test force after coating negative electrode slurry
The negative electrode slurry of the preparation of embodiment and comparative example is coated on 6 μ m-thick copper foil base materials respectively, from head to
Four section oven temperatures of tail are respectively at 88 DEG C, 95 DEG C, 95 DEG C, 92 DEG C, are respectively 26Hz, 29Hz, 32Hz, 30Hz in wind frequency
Under, single side coated weight 110g/m2, coating speed 5m/min, after the completion of coating, to cathode pole piece carry out peeling force survey
Examination, as a result as shown in Fig. 6.
The result shows that the peel strength of the negative electrode slurry of addition urea preparation is apparently higher than the cathode for not adding urea preparation
The peel strength of slurry.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.
Claims (9)
1. a kind of negative electrode slurry, in parts by weight, the negative electrode slurry includes:
2. negative electrode slurry according to claim 1, wherein the thickener is sodium carboxymethylcellulose, the conductive agent
Selected from least one of Super-P, carbon nanotube, Ks-6, the negative electrode active carbon material is graphite or incorporation silicon carbon material
Graphite, the binder be polyacrylic acid or butadiene-styrene rubber.
3. a kind of method for preparing negative electrode slurry, wherein the described method comprises the following steps:
A) water of the thickener of 1~1.5 parts by weight and 100 parts by weight is mixed to get the first mixture；
B) conductive agent of the negative electrode active carbon material of 100 parts by weight and 0.5~2 parts by weight is mixed to get the second mixture；
C) by the first mixture of the preparation of step a) described in 40~60 parts by weight, second mixture and 6~10 parts by weight
Water is mixed to get third mixture；
D) remaining first mixture of the step a) preparation, the water of 6~10 parts by weight are added into third mixture
With the urea of 1~5 parts by weight, the 4th mixture is obtained；
E) binder of 1.5~2.5 parts by weight and the 4th mixture are mixed to get the negative electrode slurry.
4. the conductive agent is selected from according to the method described in claim 3, wherein, the thickener is sodium carboxymethylcellulose
At least one of Super-P, carbon nanotube, Ks-6, the negative electrode active carbon material are graphite or the stone for mixing silicon carbon material
Ink, the binder are polyacrylic acid or butadiene-styrene rubber.
5. the method according to claim 3 or 4, wherein step a)~e) in mixing use mechanical stirring or height
Fast disperser carries out.
6. a kind of cathode, the cathode include negative electrode collector and by negative electrode slurry according to claim 1 or 2 described
The coating formed in metal foil.
7. cathode according to claim 6, wherein the negative electrode collector is the metal foil with 5~10 μ m thicks.
8. cathode according to claim 7, wherein the metal foil is copper foil.
9. a kind of lithium battery, the lithium battery includes the cathode according to any one of claim 6~8.
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Cited By (1)
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| CN110854367A (en) * | 2019-11-21 | 2020-02-28 | 陕西煤业化工技术研究院有限责任公司 | Silicon-carbon anode material slurry and preparation method thereof |
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