CN108511678A - A kind of preparation method of the anode slice of lithium ion battery of the conductive agent containing multiple elements design - Google Patents
A kind of preparation method of the anode slice of lithium ion battery of the conductive agent containing multiple elements design Download PDFInfo
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- CN108511678A CN108511678A CN201810619387.7A CN201810619387A CN108511678A CN 108511678 A CN108511678 A CN 108511678A CN 201810619387 A CN201810619387 A CN 201810619387A CN 108511678 A CN108511678 A CN 108511678A
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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
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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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0419—Methods of deposition of the material involving spraying
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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
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- H—ELECTRICITY
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- 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
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Abstract
The invention belongs to field of power lithium ion battery technology, and in particular to a kind of preparation method of the anode slice of lithium ion battery of the conductive agent containing multiple elements design, including：(1) PVDF and polar solvent NMP are sequentially added in closing slurry cylinder, graphene powder, graphite powder and nickel powder is added in 40~60min of gluing；Continue gluing, obtains mixed liquor；(2) positive active material is added in mixed liquor and is stirred, polar solvent NMP is added and adjusts slurry viscosity；(3) above-mentioned slurry low speed is homogenized, is uniformly coated on the tow sides of plus plate current-collecting body, using methane as auxiliary gas, aluminium powder sprayed into plus plate current-collecting body surface by the way of supersonic flame spraying, obtains anode pole piece；The present invention is using methane as auxiliary gas, carbon nanotube is formed on the surface of coating using supersonic flame spraying, conductive structure is formed by with the graphene powder and graphite powder of deep layer to be formed at many levels, the Conducting forms of multiple elements design, to greatly improve the electric conductivity of the anode pole piece.
Description
Technical field
The invention belongs to field of power lithium ion battery technology, and in particular to a kind of lithium ion of the conductive agent containing multiple elements design
The preparation method of battery positive pole piece.
Background technology
The development of the considerations of in terms of for environmental protection and resources, internal-combustion engines vehicle are faced with serious environment dirt
Dye and oil crisis.The fundamental way for solving the problems, such as this is to greatly develop electric vehicle, power source-electricity of electric vehicle
Pond is one of the most important Pinch technology for restricting its development.With new-energy automobile field to battery durable mileage requirement increasingly
It improves, is badly in need of improving power lithium-ion battery energy density, it is that raising battery capacity is most direct to improve positive active material ratio
Method, but when activity substance content reaches 95% or more, can have battery pole piece using conventional conductive agent (SP/Ks-6) and add
The shortcomings that work (such as pole piece broken belt when roll-in, cutting), electric conductivity are deteriorated.
From lithium ion battery operation principle it is found that the charge and discharge process of battery, needs the common participation of lithium ion and electronics,
Therefore, the electrode of lithium ion battery must be the mixture of ion and electronics, and electrode reaction also can only occur in electrolyte, conduction
Agent, active material interface.In lithium ion battery, cathode active material is mostly transition metal oxide or transition metal
Phosphate, belongs to semiconductor or insulator mostly, and electric conductivity is very poor, it is necessary to conductive agent be added to improve electric conductivity；Anode graphite
The electric conductivity of material is slightly good, but in multiple charge and discharge process, the expansion and contraction of graphite material so that between graphite particle
Contact reduce, gap increase, some even be detached from collector, become dead active material, be no longer participate in electrode reaction, so
It is also required to that conductive agent is added to be maintained at the stabilization of the electrode material electric conductivity during circulating battery.Existing common conductive agent
There are carbon black, electrically conductive graphite, carbon nanotube and carbon nano-fiber etc..
In existing common conductive agent, the characteristics of conductive black is that grain size is small, and specific surface area is especially big, good conductivity,
It can play the role of imbibition in battery and protect liquid；The grain size of electrically conductive graphite is close to the grain size of positive and negative anodes active material, specific surface area
Moderate, electric conductivity is good, it serves as the node of conductive network in the battery；Carbon nanotube is emerging in recent years conductive agent, it
For general diameter in 5nm or so, length reaches 10-20 μm, and the effect of " conducting wire " can not only be served as in conductive network, simultaneously also
With electric double layer effect, the high-rate characteristics of ultracapacitor are played, good electric conductivity also helps battery charging and discharging
When heat dissipation, reduce the polarization of battery, improve the high temperature performance of battery, extend the service life of battery.However, relative to theoretical ratio
Surface area is 2600m2/ g, heat conductivility are 3000W/ (mK), electron mobility 15000cm2The graphene material of/(Vs)
For material, the electric conductivity of conventional conductive agent is obviously inferior.
Invention content
For the problems of the prior art, the purpose of the present invention is to provide a kind of lithium ions of conductive agent containing multiple elements design
The preparation method of battery positive pole piece is somebody's turn to do the anode slice of lithium ion battery containing multiple elements design conductive agent compared to traditional
The pole piece of Super-P and KS-6 conductive agents has better processability, electric conductivity.
To achieve the goals above, the present invention is achieved by the following scheme：
A kind of preparation method of the anode slice of lithium ion battery of the conductive agent containing multiple elements design, includes the following steps：
(1) close starch cylinder in sequentially add PVDF and polar solvent NMP, it is vacuum state to keep closing slurry cylinder, gluing 40~
Then graphene powder, graphite powder and nickel powder is added in 60min；Continue 1~2h of gluing, obtains mixed liquor；
(2) positive active material is added in above-mentioned mixed liquor and is stirred, polar solvent NMP is then added and adjusts slurry
Expect that viscosity to 6000~8000mPas, should keep closing slurry cylinder being vacuum state in the process；
(3) above-mentioned slurry low speed is homogenized, the tow sides of plus plate current-collecting body is then uniformly coated on, at 100~120 DEG C
At a temperature of toast 10~15s after, using methane as assist gas, aluminium powder is sprayed to by the way of supersonic flame spraying
On the coating on plus plate current-collecting body surface, anode pole piece is obtained.
Preferably, in step (1), the mass fraction that each material in conjunction slurry cylinder is added is：5~10 parts of PVDF, NMP 40~
55 parts, 0.5~3 part of graphene powder, 0.5~2 part of graphite powder, 0.1~0.5 part of nickel powder.
Preferably, in step (2), the additive amount of the positive active material be mixed liquor weight in step (1) 2~
3.5 again.
Preferably, the graphite powder is at least one of natural flake graphite, expanded graphite, highly oriented graphite.
Preferably, in step (3), the plus plate current-collecting body is aluminium foil, and the thickness of the aluminium foil is 10~20 μm.
Preferably, in step (3), the spray parameters of the supersonic flame spraying are, using oxygen as combustion-supporting gas, hydrogen
Gas is as combustion gas, and nitrogen is as powder feeding gas；
The pressure of the oxygen is 15~25bar, and flow is 400~900slpm, and the pressure of hydrogen is 6~8bar, flow
For 30~50slpm, it is 1~3bar to assist the pressure of gases methane, and flow is 5~10slpm, and the pressure of nitrogen is 4~8bar,
Flow is 12~24slpm, and powder feed rate is 10~50g/min, and spray distance is 200~300mm.
Compared with prior art, the present invention has the following technical effects：
The preparation method of anode slice of lithium ion battery provided by the invention passes through a variety of objects with superior electrical conductivity energy
Matter is coated in the surface of plus plate current-collecting body, using methane as auxiliary gas, is sprayed aluminium powder by the way of supersonic flame spraying
It is coated onto on the coating on plus plate current-collecting body surface, which is sprayed on after the coating on plus plate current-collecting body surface to be formed and be etched on coating
Oxide, have certain conductive capability；
Secondly, the methane gas being mingled in supersonic flame generates carbon nanometer under the catalytic action of nickel powder in the coating
Pipe, the carbon nanotube itself have higher intensity, also, since the structure of carbon nanotube and the lamellar structure of graphite are identical,
So further being formed on the surface of plus plate current-collecting body coating after the supersonic flame spraying with good electric property
Carbon nanotube is formed by conductive structure with the graphene powder and graphite powder of deep layer and is formed at many levels, the conduction of multiple elements design
Form, to greatly improve the electric conductivity of the anode pole piece.
Other features and advantages of the present invention will be described in detail in subsequent specific implementation mode.
Specific implementation mode
In order to make the technical means, the creative features, the aims and the efficiencies achieved by the present invention be easy to understand, tie below
Specific embodiment is closed, the present invention is furture elucidated.
The present invention provides a kind of preparation methods of the anode slice of lithium ion battery of conductive agent containing multiple elements design, including with
Lower step：
(1) close starch cylinder in sequentially add PVDF and polar solvent NMP, it is vacuum state to keep closing slurry cylinder, gluing 40~
Then graphene powder, graphite powder and nickel powder is added in 60min；Continue 1~2h of gluing, obtains mixed liquor；
(2) positive active material is added in above-mentioned mixed liquor and is stirred, polar solvent NMP is then added and adjusts slurry
Expect that viscosity to 6000~8000mPas, should keep closing slurry cylinder being vacuum state in the process；
(3) above-mentioned slurry low speed is homogenized, the tow sides of plus plate current-collecting body is then uniformly coated on, at 100~120 DEG C
At a temperature of toast 10~15s after, using methane as assist gas, aluminium powder is sprayed to by the way of supersonic flame spraying
On the coating on plus plate current-collecting body surface, anode pole piece is obtained.
In the present invention, the PVDF is Kynoar, in the present invention function as positive bonding
The solid content of agent, heretofore described PVDF is 5~10%.
In the present invention, the polar solvent NMP, complete entitled N-Methyl pyrrolidone.
In the present invention, the graphene powder is a kind of single layer two-dimension plane structure material that carbon atom is constituted, and is had
Good light transmission, electric conductivity, heat conductivility and mechanical property；The resistivity of graphene only has 10-6Ω cm, than copper or
Silver is lower, is the material of current resistivity minimum；In addition, graphene is also material most thin but most hard at present, therefore, by stone
Black alkene powder is excellent selection, heretofore described Graphene powder as the constituent of lithium ion battery conductive agent is constituted
Body is purchased from the graphene powder of Guizhou Ding Xixi materials High Seience Technology Co., Ltd. production；
The graphite powder is one of good non-metal conductive materials, also, graphite powder also has high temperature resistant, high intensity
The advantages of, superhigh temperature electric arc calcination is even undergone, the weight loss of graphite powder can also ignore, and its coefficient of thermal expansion
Also very little；Also there is graphite powder the characteristic of lubrication, heretofore described graphite powder to be purchased from Chengan County auspicious sign carbon Co., Ltd；
The present invention by will have superior electrical conductivity can the blending of graphene powder and graphite powder together with and coated in just
The positive and negative of pole collector forms coating, then using methane as auxiliary gas, by aluminium by the way of supersonic flame spraying
Powder sprays on the coating on plus plate current-collecting body surface, which, which is sprayed on to be formed after the coating on plus plate current-collecting body surface, is etched in painting
Oxide on layer has certain conductive capability；Secondly, the methane gas being mingled in supersonic flame nickel powder in the coating
Catalytic action under generate carbon nanotube, the carbon nanotube itself has higher intensity, also, due to the structure of carbon nanotube
It is identical as the lamellar structure of graphite, so there is good electric property, further, in anode after the supersonic flame spraying
The surfaces of current collector coatings forms carbon nanotube, with the graphene powder and graphite powder of deep layer be formed by conductive structure formed it is more
Level, the Conducting forms of multiple elements design, to greatly improve the electric conductivity of the anode pole piece.
In the preparation method of anode slice of lithium ion battery provided by the invention, evade in traditional technology using roll-in
Mode carries out compacting operation to the collector that coating is completed, but the coating for using high-speed flow tentatively to dry collection liquid surface
Air pressure is carried out, has equally achieved the purpose that compacting；The problem of avoiding the fringe margin, broken belt, roll banding that occur when roll-in.
Further, according to the present invention, in of the invention, in the step (1), the quality for closing each material in slurry cylinder is added
Number is：10~15 parts of PVDF, 40~55 parts of NMP, 1~5 part of graphene powder, 0.5~2 part of graphite powder, nickel powder 0.1~
0.5 part.
Further, in step (2), the additive amount of the positive active material be mixed liquor weight in step (1) 2~
3.5 again.
In the present invention, the graphite powder is at least one of natural flake graphite, expanded graphite, highly oriented graphite.
According to the present invention, in the step (3), the plus plate current-collecting body is aluminium foil, and the thickness of the aluminium foil is 10
~20 μm.
According to the present invention, in step (3), the spray parameters of the supersonic flame spraying are, using oxygen as combustion-supporting
Gas, hydrogen is as combustion gas, and nitrogen is as powder feeding gas；
The pressure of the oxygen is 15~25bar, and flow is 400~900slpm, and the pressure of hydrogen is 6~8bar, flow
For 30~50slpm, it is 1~3bar to assist the pressure of gases methane, and flow is 5~10slpm, and the pressure of nitrogen is 4~8bar,
Flow is 12~24slpm, and powder feed rate is 80~120g/min, and spray distance is 200~300mm.
The anode pole piece of lithium ion battery provided by the invention, including plus plate current-collecting body and positioned at the plus plate current-collecting body just
The positive electrode coating on anti-two sides；
The positive electrode coating includes positive active material, multiple elements design conductive agent, positive electrode binder and solvent.
The positive active material is selected from NCM523/LMFP, NCM622/LMFP, NCM523, NCM622 and NCM111
One or more of mixture.
Below by way of specific embodiment to the lithium ionic cell positive pole of the conductive agent provided by the invention containing multiple elements design
The preparation method of piece is described further.
Embodiment 1
A kind of anode slice of lithium ion battery, including plus plate current-collecting body and positioned at the plus plate current-collecting body tow sides just
Pole material coating；
The plus plate current-collecting body is the aluminium foil that thickness is 20 μm；
The positive electrode coating includes positive active material, multiple elements design conductive agent, positive electrode binder and solvent；
The positive active material is NCM523/LMFP composite positive poles；
The preparation method of the anode slice of lithium ion battery includes the following steps：
(1) 12 parts of PVDF and 45 part of polar solvent NMP are sequentially added in closing slurry cylinder, keep closing slurry cylinder being vacuum state,
Then 3 parts of graphene powders, 1 part of graphite powder and 0.3 part of nickel powder is added in gluing 50min；Continue gluing 2h, obtains mixed liquor；
(2) positive active material of 2.5 times of weight of above-mentioned mixed liquor is added in above-mentioned mixed liquor and is stirred, then
Polar solvent NMP is added and adjusts slurry viscosity to 7000mPas, should keep closing slurry cylinder in the process being vacuum state；
(3) above-mentioned slurry low speed is homogenized, the tow sides of plus plate current-collecting body is then uniformly coated on, in 110 DEG C of temperature
After the lower baking 15s of degree, using methane as auxiliary gas, aluminium powder is sprayed into anode collection by the way of supersonic flame spraying
On the coating in body surface face, anode pole piece is obtained；
The spray parameters of the supersonic flame spraying are that, using oxygen as combustion-supporting gas, hydrogen is made as combustion gas, nitrogen
For powder feeding gas；
The pressure of the oxygen is 20bar, flow 600slpm, and the pressure of hydrogen is 7bar, flow 40slpm, auxiliary
It is 2bar to help the pressure of gases methane, flow 8slpm, and the pressure of nitrogen is 6bar, flow 15slpm, and powder feed rate is
30g/min, spray distance 250mm.
Embodiment 2
A kind of anode slice of lithium ion battery, including plus plate current-collecting body and positioned at the plus plate current-collecting body tow sides just
Pole material coating；
The plus plate current-collecting body is the aluminium foil that thickness is 20 μm；
The positive electrode coating includes positive active material, multiple elements design conductive agent, positive electrode binder and solvent；
The positive active material is NCM523/LMFP composite positive poles；
The preparation method of the anode slice of lithium ion battery includes the following steps：
(1) 10 parts of PVDF and 40 part of polar solvent NMP are sequentially added in closing slurry cylinder, keep closing slurry cylinder being vacuum state,
Then 1 part of graphene powder, 0.5 part of graphite powder and 0.1 part of nickel powder is added in gluing 40min；Continue gluing 1h, obtains mixed liquor；
(2) positive active material of 2 times of weight of above-mentioned mixed liquor is added in above-mentioned mixed liquor and is stirred, then added
Enter polar solvent NMP and adjust slurry viscosity to 6000mPas, should keep closing slurry cylinder in the process being vacuum state；
(3) above-mentioned slurry low speed is homogenized, the tow sides of plus plate current-collecting body is then uniformly coated on, in 100 DEG C of temperature
After the lower baking 15s of degree, using methane as auxiliary gas, aluminium powder is sprayed into anode collection by the way of supersonic flame spraying
On the coating in body surface face, anode pole piece is obtained；
The spray parameters of the supersonic flame spraying are that, using oxygen as combustion-supporting gas, hydrogen is made as combustion gas, nitrogen
For powder feeding gas；
The pressure of the oxygen is 20bar, flow 600slpm, and the pressure of hydrogen is 7bar, flow 40slpm, auxiliary
It is 2bar to help the pressure of gases methane, flow 8slpm, and the pressure of nitrogen is 6bar, flow 15slpm, and powder feed rate is
30g/min, spray distance 250mm.
Embodiment 3
A kind of anode slice of lithium ion battery, including plus plate current-collecting body and positioned at the plus plate current-collecting body tow sides just
Pole material coating；
The plus plate current-collecting body is the aluminium foil that thickness is 20 μm；
The positive electrode coating includes positive active material, multiple elements design conductive agent, positive electrode binder and solvent；
The positive active material is NCM523/LMFP composite positive poles；
The preparation method of the anode slice of lithium ion battery includes the following steps：
(1) 15 parts of PVDF and 55 part of polar solvent NMP are sequentially added in closing slurry cylinder, keep closing slurry cylinder being vacuum state,
Then 5 parts of graphene powders, 2 parts of graphite powders and 0.5 part of nickel powder is added in gluing 50min；Continue gluing 2h, obtains mixed liquor；
(2) positive active material of 3.5 times of weight of above-mentioned mixed liquor is added in above-mentioned mixed liquor and is stirred, then
Polar solvent NMP is added and adjusts slurry viscosity to 8000mPas, should keep closing slurry cylinder in the process being vacuum state；
(3) above-mentioned slurry low speed is homogenized, the tow sides of plus plate current-collecting body is then uniformly coated on, in 120 DEG C of temperature
After the lower baking 10s of degree, using methane as auxiliary gas, aluminium powder is sprayed into anode collection by the way of supersonic flame spraying
On the coating in body surface face, anode pole piece is obtained；
The spray parameters of the supersonic flame spraying are that, using oxygen as combustion-supporting gas, hydrogen is made as combustion gas, nitrogen
For powder feeding gas；
The pressure of the oxygen is 20bar, flow 600slpm, and the pressure of hydrogen is 7bar, flow 40slpm, auxiliary
It is 2bar to help the pressure of gases methane, flow 8slpm, and the pressure of nitrogen is 6bar, flow 15slpm, and powder feed rate is
30g/min, spray distance 250mm.
Embodiment 4
The present embodiment and the anode slice of lithium ion battery of embodiment 1 and preparation method thereof are essentially identical, unlike, it adopts
Positive active material is NCM622/LMFP composite materials.
Embodiment 5
The present embodiment and the anode slice of lithium ion battery of embodiment 1 and preparation method thereof are essentially identical, unlike, it adopts
Positive active material is NCM523.
Embodiment 6
The present embodiment and the anode slice of lithium ion battery of embodiment 1 and preparation method thereof are essentially identical, unlike, it adopts
Positive active material is NCM622.
Embodiment 7
The present embodiment and the anode slice of lithium ion battery of embodiment 1 and preparation method thereof are essentially identical, unlike, it adopts
Positive active material is NCM111.
Comparative example 1
The present embodiment and the anode slice of lithium ion battery of embodiment 1 and preparation method thereof are essentially identical, unlike,
In the step of described preparation method (1), nickel powder is not added, remaining is constant.Specifically：
The preparation method of the anode slice of lithium ion battery includes the following steps：
(1) 12 parts of PVDF and 45 part of polar solvent NMP are sequentially added in closing slurry cylinder, keep closing slurry cylinder being vacuum state,
Then 3 parts of graphene powders and 1 part of graphite powder is added in gluing 50min；Continue gluing 2h, obtains mixed liquor；
(2) positive active material of 2.5 times of weight of above-mentioned mixed liquor is added in above-mentioned mixed liquor and is stirred, then
Polar solvent NMP is added and adjusts slurry viscosity to 7000mPas, should keep closing slurry cylinder in the process being vacuum state；
(3) above-mentioned slurry low speed is homogenized, the tow sides of plus plate current-collecting body is then uniformly coated on, in 110 DEG C of temperature
After the lower baking 15s of degree, using methane as auxiliary gas, aluminium powder is sprayed into anode collection by the way of supersonic flame spraying
On the coating in body surface face, anode pole piece is obtained；
The spray parameters of the supersonic flame spraying are that, using oxygen as combustion-supporting gas, hydrogen is made as combustion gas, nitrogen
For powder feeding gas；
The pressure of the oxygen is 20bar, flow 600slpm, and the pressure of hydrogen is 7bar, flow 40slpm, auxiliary
It is 2bar to help the pressure of gases methane, flow 8slpm, and the pressure of nitrogen is 6bar, flow 15slpm, and powder feed rate is
30g/min, spray distance 250mm.
Comparative example 2
The present embodiment and the anode slice of lithium ion battery of embodiment 1 and preparation method thereof are essentially identical, unlike,
In the step of described preparation method (1), graphene powder is not added, remaining is constant.Specifically：
The preparation method of the anode slice of lithium ion battery includes the following steps：
(1) 12 parts of PVDF and 45 part of polar solvent NMP are sequentially added in closing slurry cylinder, keep closing slurry cylinder being vacuum state,
Then 1 part of graphite powder and 0.3 part of nickel powder is added in gluing 50min；Continue gluing 2h, obtains mixed liquor；
(2) positive active material of 2.5 times of weight of above-mentioned mixed liquor is added in above-mentioned mixed liquor and is stirred, then
Polar solvent NMP is added and adjusts slurry viscosity to 7000mPas, should keep closing slurry cylinder in the process being vacuum state；
(3) above-mentioned slurry low speed is homogenized, the tow sides of plus plate current-collecting body is then uniformly coated on, in 110 DEG C of temperature
After the lower baking 15s of degree, using methane as auxiliary gas, aluminium powder is sprayed into anode collection by the way of supersonic flame spraying
On the coating in body surface face, anode pole piece is obtained；
The spray parameters of the supersonic flame spraying are that, using oxygen as combustion-supporting gas, hydrogen is made as combustion gas, nitrogen
For powder feeding gas；
The pressure of the oxygen is 20bar, flow 600slpm, and the pressure of hydrogen is 7bar, flow 40slpm, auxiliary
It is 2bar to help the pressure of gases methane, flow 8slpm, and the pressure of nitrogen is 6bar, flow 15slpm, and powder feed rate is
30g/min, spray distance 250mm.
Comparative example 3
The present embodiment and the anode slice of lithium ion battery of embodiment 1 and preparation method thereof are essentially identical, unlike,
In the step of described preparation method (1), graphite powder is not added, remaining is constant.Specifically：
The preparation method of the anode slice of lithium ion battery includes the following steps：
(1) 12 parts of PVDF and 45 part of polar solvent NMP are sequentially added in closing slurry cylinder, keep closing slurry cylinder being vacuum state,
Then 3 parts of graphene powders and 0.3 part of nickel powder is added in gluing 50min；Continue gluing 2h, obtains mixed liquor；
(2) positive active material of 2.5 times of weight of above-mentioned mixed liquor is added in above-mentioned mixed liquor and is stirred, then
Polar solvent NMP is added and adjusts slurry viscosity to 7000mPas, should keep closing slurry cylinder in the process being vacuum state；
(3) above-mentioned slurry low speed is homogenized, the tow sides of plus plate current-collecting body is then uniformly coated on, in 110 DEG C of temperature
After the lower baking 15s of degree, using methane as auxiliary gas, aluminium powder is sprayed into anode collection by the way of supersonic flame spraying
On the coating in body surface face, anode pole piece is obtained；
The spray parameters of the supersonic flame spraying are that, using oxygen as combustion-supporting gas, hydrogen is made as combustion gas, nitrogen
For powder feeding gas；
The pressure of the oxygen is 20bar, flow 600slpm, and the pressure of hydrogen is 7bar, flow 40slpm, auxiliary
It is 2bar to help the pressure of gases methane, flow 8slpm, and the pressure of nitrogen is 6bar, flow 15slpm, and powder feed rate is
30g/min, spray distance 250mm.
Dependence test：
1, the anode pole piece being prepared in embodiment is fixed using peel strength special adhesive tape, tests the stripping of pole piece
Intensity, tester stretch, and the length for removing anode pole piece is 50mm, and the peel strength of test is recorded in table 1.
2, using the resistivity for the anode pole piece being prepared in four probe method testing example, test result is recorded
In table 1.
Table 1：
Can be seen that anode slice of lithium ion battery provided by the invention in conjunction with above-mentioned test data has excellent processing
Performance and electric conductivity.
The basic principles and main features and the features of the present invention of the present invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement is both fallen in the range of claimed invention.The scope of protection of present invention is by appended claims
And its equivalent thereof.
Claims (6)
1. a kind of preparation method of the anode slice of lithium ion battery of conductive agent containing multiple elements design, it is characterised in that：Including following
Step：
(1) close starch cylinder in sequentially add PVDF and polar solvent NMP, it is vacuum state to keep closing slurry cylinder, gluing 40~
Then graphene powder, graphite powder and nickel powder is added in 60min；Continue 1~2h of gluing, obtains mixed liquor；
(2) positive active material is added in above-mentioned mixed liquor and is stirred, it is viscous that polar solvent NMP adjusting slurries are then added
Degree should keep closing slurry cylinder being vacuum state in the process to 6000~8000mPas；
(3) above-mentioned slurry low speed is homogenized, the tow sides of plus plate current-collecting body is then uniformly coated on, in 100~120 DEG C of temperature
After 10~15s of the lower baking of degree, using methane as auxiliary gas, aluminium powder is sprayed into anode by the way of supersonic flame spraying
On the coating of collection liquid surface, anode pole piece is obtained.
2. the preparation method of the anode slice of lithium ion battery of the conductive agent according to claim 1 containing multiple elements design, special
Sign is：In step (1), the mass fraction that each material in conjunction slurry cylinder is added is：5~10 parts of PVDF, 40~55 parts of NMP, stone
0.5~3 part of black alkene powder, 0.5~2 part of graphite powder, 0.1~0.5 part of nickel powder.
3. the preparation method of the anode slice of lithium ion battery of the conductive agent according to claim 2 containing multiple elements design, special
Sign is：In step (2), the additive amount of the positive active material is 2~3.5 times of mixed liquor weight in step (1).
4. the preparation method of the anode slice of lithium ion battery of the conductive agent according to claim 1 containing multiple elements design, special
Sign is：The graphite powder is at least one of natural flake graphite, expanded graphite, highly oriented graphite.
5. the preparation method of the anode slice of lithium ion battery of the conductive agent according to claim 1 containing multiple elements design, special
Sign is：In step (3), the plus plate current-collecting body is aluminium foil, and the thickness of the aluminium foil is 10~20 μm.
6. the preparation method of the anode slice of lithium ion battery of the conductive agent according to claim 1 containing multiple elements design, special
Sign is：In step (3), the spray parameters of the supersonic flame spraying are that, using oxygen as combustion-supporting gas, hydrogen is as combustion
Gas, nitrogen is as powder feeding gas；
The pressure of the oxygen is 15~25bar, and flow is 400~900slpm, and the pressure of hydrogen is 6~8bar, flow 30
~50slpm, it is 1~3bar to assist the pressure of gases methane, and flow is 5~10slpm, and the pressure of nitrogen is 4~8bar, flow
For 12~24slpm, powder feed rate is 10~50g/min, and spray distance is 200~300mm.
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| CN106299243A (en) * | 2016-08-25 | 2017-01-04 | 合肥国轩高科动力能源有限公司 | Lithium ion battery positive pole piece containing composite conductive agent |
| CN108028355A (en) * | 2015-11-30 | 2018-05-11 | 株式会社Lg化学 | Anode of secondary cell and the secondary cell for including it |
| CN108054425A (en) * | 2017-12-09 | 2018-05-18 | 珠海聚碳复合材料有限公司 | A kind of preparation method of new high magnification ternary nickel cobalt aluminum electrokinetic cell |
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