CN109216669A - A kind of preparation method of lithium cell cathode material - Google Patents
A kind of preparation method of lithium cell cathode material Download PDFInfo
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- CN109216669A CN109216669A CN201810875184.4A CN201810875184A CN109216669A CN 109216669 A CN109216669 A CN 109216669A CN 201810875184 A CN201810875184 A CN 201810875184A CN 109216669 A CN109216669 A CN 109216669A
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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
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- 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
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/387—Tin or alloys based on tin
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- H—ELECTRICITY
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- 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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- 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
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
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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
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
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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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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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
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- 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 a kind of preparation methods of lithium cell cathode material, auxiliary intercalator removing graphite powder is combined to obtain graphene powder using supercritical fluid, by gained graphene powder and nanometer glass putty, polyacrylonitrile, ultrasonic mixing obtains graphene, nanometer glass putty, polyacrylonitrile mixture according to a certain percentage, then gained mixture is obtained graphene, nanometer glass putty, polyacrylonitrile composite negative pole material through washing, freeze-drying, calcining.The preparation-obtained lithium cell cathode material stability of the present invention is high, cyclicity is good, and can greatly promote the specific capacity of lithium battery.
Description
Technical field
The present invention relates to a kind of preparation technical fields of lithium cell cathode material, and in particular to a kind of lithium cell cathode material
Preparation method.
Background technique
Graphene is a kind of new material for possessing unique texture and excellent properties, it is monoatomic layer bi-dimensional cellular shape knot
Structure, it is considered to be the basic structural unit of fullerene, carbon nanotube and graphite.Zero dimension fullerene is to bend to football by graphene
What shape obtained, one-dimensional carbon nanotube is crimped by graphene, and the graphite of three-dimensional structure is then considered as graphene sheet layer
Close stack.It has become about the theoretical research of graphene, experiment preparation and application etc. and studies both at home and abroad in recent years
Hot spot.Since graphene has many good characteristics such as high conductivity, high-termal conductivity, high-specific surface area, high intensity and rigidity,
The numerous areas such as energy storage, photoelectric device, chemical catalysis have been widely used, wherein especially prominent in field of lithium ion battery
It cries.Lithium ion battery is the highest secondary cell of specific energy so far, has best comprehensive performance, it has also become portable electric
The first choice of sub- equipment and electrical source of power, especially the latter propose energy density, the power density of lithium ion battery higher
It is required that.The appearance of graphene is that the high performance breakthrough of lithium ion battery brings possibility, to be high capacity, high magnification, longevity
The research of the lithium ion battery material of life starts the research boom of a new round.
A kind of preparation method of lithium cell cathode material, specific method packet are disclosed in prior art CN 106410200A
It includes using sour intercalation expanding method, liquid phase removing prepares graphene, in admixed graphite alkene and nano silica fume, polyacrylonitrile, artificial
Graphite, freeze-drying, sintering, dusting handle to obtain graphene/silicon/c-PAN/ artificial graphite mixing negative electrode material.But in this way
It is larger to there is obtained graphene size in processing, prevent nano silica fume, polyacrylonitrile be from sufficient graphene-doped lamella,
To influence the stability of lithium cell cathode material, the specific capacity of lithium battery is also influenced.
Summary of the invention
In view of the deficienciess of the prior art, technical problem to be solved by the invention is to provide a kind of high stabilities, height
Specific capacity, good cycle, and the preparation method of the lithium cell cathode material of metallic tin volume expansion can be inhibited very well.
In order to solve the above technical problems, the present invention provides a kind of preparation method of lithium cell cathode material, including following step
It is rapid:
Step A, graphene powder is prepared
(1) graphitic source, auxiliary intercalator are added in high-pressure reactor, and stirs and forms mixed liquor；
(2) when temperature reaches preset value in the reactor, it is passed through remover, is pressurized, remover is made to reach supercritical state
Continue stirring under state and carry out flowing 6-12 hours, decompression is deflated, and graphene solution is obtained；
(3) after centrifugation, washing, the freeze-drying graphite weak solution, graphene powder is obtained；
Step B, lithium cell cathode material is prepared
(1) graphene powder and nanometer glass putty, polyacrylonitrile are subjected to ultrasonic mixing, obtain graphene, nanometer tin
Powder, polyacrylonitrile mixture,
(2) mixture is obtained into graphene, nanometer glass putty, polyacrylonitrile Compound Negative through washing, freeze-drying, calcining
Pole material.
As a preference, graphitic source described in step A (1) is molten for the graphite oxide obtained by oxidizer treatment
Liquid, the oxidant are HNO3, H2SO4, HClO4, KMnO4One of, select the graphite solution conduct after oxidation processes
Graphitic source, obtained graphene is smaller, further increases the specific capacity of lithium cell cathode material.
As a preference, auxiliary intercalator described in step A (1) is dimethylformamide, methyl pyrrolidone, ten
One of dialkyl benzene sulfonic acids sodium or lauryl sodium sulfate assist the effect of intercalator to be that it can be reached in remover
When to supercriticality, enter graphite layers together therewith, to promote the removing of graphite, plays the role of assisting intercalation.
Further, the mode that stirring described in step A (1) forms mixed liquor is magnetic agitation, and mixing speed is
100-200r/min。
As a preference, remover described in step A (2) is one of carbon dioxide, methanol or ethyl alcohol.
As a preference, preset value described in step A (2) is 80-300 DEG C.Herein to the selection of temperature, mainly because of stripping
It is different from the difference that agent selects.
Continue stirring described in step A (2) in the case where remover reaches supercriticality and carries out flowing 6h-12h.Faced using super
Boundary's fluid removes dispersed graphite, obtains graphene under the action of assisting intercalation, small less than 6 if flowing time is too short
When, it will cause graphite dispersion incomplete, obtained graphene concentration is also lower；And if splitting time is too long, not
Can further big raising graphite dispersion effect, also will affect the preparation process of entire lithium cell cathode material.By a large amount of
Experiment finds that the mixing time time in 6-12h, can obtain preferable dispersion effect and make the technique stream entirely prepared
Cheng Bubi is too long.
As the further improvement of lithium battery preparation method of the present invention, further comprise the steps of: before step A (3) by A (2)
Gained graphene solution passes through ultrasonic high-speed shearing machine.Its shear time is 10-30min, and the ultrasound high-speed shearing machine surpasses
Acoustical power is 1000-1200W.By graphene solution resulting after supercritical fluid is removed using the work of high-speed shearing machine
With graphite is further dispersed, and final resulting graphene content significantly improves, and the size of graphene is further reduced.
As a preference, ultrasonic mixing technique described in step B (1), ultrasonic time 30-60min, ultrasonic function
Rate is 500-800W.
As a preference, the mass ratio of graphene powder described in step B (1), nanometer glass putty, polyacrylonitrile are as follows:
0.2-0.8:2-8:2-4, the partial size of the nanometer glass putty are 20-60nm.
As a preference, calcine technology described in step B (2) is specially by graphene, nanometer glass putty, polyacrylonitrile
Mixture is placed in the furnace of nitrogen protection, controlled at 400-500 DEG C, calcines 5-10h.
The present invention also provides a kind of lithium ion battery negative electrodes, which is characterized in that including negative current collector and is coated in
The cathode membrane on the negative current collector surface, the cathode membrane include lithium cell cathode material described in any of the above embodiments
Graphene, the nanometer glass putty, polyacrylonitrile composite negative pole material of preparation method preparation.
The beneficial effects of the present invention are:
(1) under the action of assisting intercalator, graphene powder, gained stone are prepared using supercritical fluid as remover
Black alkene content is high；
(2) select the graphite Jing Guo oxidation processes as raw material, obtained graphene size substantially reduces；
(3) after supercritical fluid removing a period of time, gained graphene solution is passed through to the effect of ultrasonic high-speed shearing machine,
So that graphite is further dispersed, graphene content increases, while also improving the utilization rate of graphite.
(4) adding the compound removing graphitic source of high energy shear using supercritical fluid, graphene size obtained further decreases,
With superelevation conductivity, the lithium cell cathode material of more height ratio capacity is further obtained.
(5) nanometer glass putty, polyacrylonitrile and the compound resulting negative electrode material of graphene are selected, while possessing graphene and carbon
Structure, can be very good inhibit metallic tin volume expansion, have superior cycle performance, higher stability and high ratio
Capacity.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is general
Logical technical staff every other embodiment obtained without creative efforts belongs to what the present invention protected
Range.
Embodiment 1 prepares graphene powder
Graphitic source is added in high-pressure reactor, the graphitic source is that 5g graphite powder passes through oxidant H2S04After solution processing
Obtained graphite oxide solution is added 100ml and assists intercalator dimethylformamide, and setting temperature of reactor is 100 DEG C, magnetic force
1h, mixing speed 200r/min are stirred, mixed liquor is formed.
When temperature reaches 100 degrees Celsius, it is passed through remover carbon dioxide, pressurization makes carbon dioxide reach supercritical state
State continues after being stirred to react 12h, and decompression deflates and obtains graphene solution, and the graphene in acquired solution less than 8 layers accounts for after measured
71.6%.
Acquired solution is obtained into graphene powder by drying in centrifugation, washing, freeze drier.
Embodiment 2 prepares graphene powder
Graphitic source is added in high-pressure reactor, the graphitic source is that 5g graphite powder passes through oxidant KMnO4Solution processing
100ml neopelex is added in the graphite oxide solution obtained afterwards, and setting temperature in the kettle is 80 DEG C, magnetic agitation 1h,
Mixing speed is 100r/min, forms mixed liquor.
When temperature reaches 80 degrees Celsius, it is passed through remover carbon dioxide, pressurization makes carbon dioxide reach supercriticality,
Continue after being stirred to react 6h, decompression deflates and obtains graphene solution, and gained graphene solution is passed through ultrasonic high-speed shearing machine, controls
Ultrasonic power processed is 1200W, and shearing took out graphene solution after 30 minutes, is less than 8 layers of graphene in acquired solution after measured
Account for 95.2%.
Acquired solution is obtained into graphene powder by drying in centrifugation, washing, freeze drier.
Embodiment 3 prepares graphene powder with without the graphitic source of oxidation processes
Graphitic source is added in high-pressure reactor, the graphitic source is that 5g graphite powder and deionized water stir the mixing to be formed
Object, is added 100ml neopelex, and setting temperature in the kettle is 100 DEG C, magnetic agitation 1.5h, mixing speed 120r/
Min forms mixed liquor.
When temperature reaches 100 DEG C, it is passed through remover carbon dioxide, pressurization makes carbon dioxide reach supercriticality, after
Continue after being stirred to react 10h, decompression deflates and obtains graphene solution, and gained graphene solution is passed through ultrasonic high-speed shearing machine, controls
Ultrasonic power processed is 1200W, and shearing took out graphene solution after 30 minutes, is less than 8 layers of graphene in acquired solution after measured
Account for 75.8%.
Acquired solution is obtained into graphene powder by drying in centrifugation, washing, freeze drier.
Embodiment 4 prepares graphene powder
Graphitic source is added in high-pressure reactor, the graphitic source is that 10g graphite powder is handled by oxidant nitric acid solution
200ml methyl pyrrolidone is added in the graphite oxide solution obtained afterwards, and setting temperature in the kettle is 240 DEG C, and magnetic agitation 1h is stirred
Mixing speed is 200r/min, forms mixed liquor.
When temperature reaches 240 degrees Celsius, it is passed through remover methanol, pressurization makes methanol reach supercriticality, continues to stir
After mixing reaction 12h, decompression deflates and obtains graphene solution, gained graphene solution is passed through ultrasonic high-speed shearing machine, control is super
Acoustical power is 1200W, and graphene solution is taken out in shearing after twenty minutes, and the graphene in acquired solution less than 8 layers accounts for after measured
89%.
Acquired solution is obtained into graphene powder by drying in centrifugation, washing, freeze drier.
Embodiment 5 prepares graphene powder
Graphitic source is added in high-pressure reactor, the graphitic source 10g graphite powder is to handle by oxidant HClO4 solution
200ml lauryl sodium sulfate is added in the graphite oxide solution obtained afterwards, and setting temperature in the kettle is 300 DEG C, magnetic agitation 1h,
Mixing speed is 200r/min, forms mixed liquor.
When temperature reaches 300 degrees Celsius, it is passed through remover ethyl alcohol, pressurization makes ethyl alcohol reach supercriticality, continues to stir
After mixing reaction 12h, decompression deflates and obtains graphene solution, gained graphene solution is passed through ultrasonic high-speed shearing machine, control is super
Acoustical power is 1200W, and shearing took out graphene solution after 30 minutes, and the graphene in acquired solution less than 8 layers accounts for after measured
92%.
Acquired solution is obtained into graphene powder by drying in centrifugation, washing, freeze drier.
Embodiment 6 prepares lithium cell cathode material with the graphene powder handled without ultrasonic high speed shear
By graphene powder and nanometer glass putty, polyacrylonitrile prepared in embodiment 1 according to mass ratio are as follows: 0.2:6:2
Ratio be added to the container, the nanometer tin powder diameter 90% and the above are 60nm is placed under ultrasonic disruption machine,
Ultrasound 1h obtains graphene, nanometer glass putty, polyacrylonitrile mixture under conditions of power is 500W, and mixture is washed, is cold
It after dry 6h is lyophilized, is placed in the furnace of nitrogen protection, controlled at 400 DEG C, calcines 10h, can be prepared by lithium cell cathode material.
Through testing, when current density is 100mA/g, after 150 circulations, specific capacity 579mA/g.
Embodiment 7 prepares lithium cell cathode material with the graphene obtained without oxidation processes
By graphene powder and nanometer glass putty, polyacrylonitrile prepared in embodiment 3 according to mass ratio are as follows: 0.3:5:3
Ratio be added to the container, the nanometer tin powder diameter 90% and the above are 40nm is placed under ultrasonic disruption machine,
Ultrasound 50min obtains graphene, nanometer glass putty, polyacrylonitrile mixture under conditions of power is 600W.
After being washed by mixture, be freeze-dried 6h, it is placed in the furnace of nitrogen protection, controlled at 470 DEG C, calcining
7h can be prepared by lithium cell cathode material.Through testing, when current density is 100mA/g, after 150 circulations, specific capacity
For 608mA/g.
Embodiment 8 prepares lithium cell cathode material
By graphene powder and nanometer glass putty, polyacrylonitrile prepared in embodiment 2 according to mass ratio are as follows: 0.8:8:4
Ratio be added to the container, the nanometer tin powder diameter 90% and the above are 20nm is placed under ultrasonic disruption machine,
Ultrasound 45min obtains graphene, nanometer glass putty, polyacrylonitrile mixture under conditions of power is 800W.
After being washed by mixture, be freeze-dried 6h, it is placed in the furnace of nitrogen protection, controlled at 500 DEG C, calcining
5h can be prepared by lithium cell cathode material.Through testing, when current density is 100mA/g, after 150 circulations, specific capacity
Still reach 782mA/g.
9 comparative example of embodiment
Lithium cell cathode material is prepared using the graphene that chemical vapour deposition technique obtains, comprising the following steps:
Selection monocrystalline silicon is substrate, in the sputtering chamber that vacuum degree is 5.0 × 10-4,30min copper, nickel is sputtered, in substrate
Surface obtain a layer thickness be 4 μm of corronil films；It is transferred in the reacting furnace of chemical vapor deposition, is passed through helium
Substrate is heated to 400 DEG C by gas in 30min, and control pressure is 10Torr；The pressure/temperature is kept, is passed through into reacting furnace
Hydrogen；The benzene injection into reacting furnace simultaneously, after the completion of benzene injection, stopping is passed through hydrogen；Backward reacting furnace in be passed through helium,
The monocrystal silicon substrate for being deposited with corronil film is rapidly cooled to room temperature, deposition obtains graphene in substrate.After measured
Graphene in gained graphene less than 8 layers only accounts for 49%.
Resulting graphene and nanometer glass putty, polyacrylonitrile will be prepared according to mass ratio are as follows: the ratio of 0.6:7:4, which is added, to be held
In device, the nanometer tin powder diameter 90% and the above are 60nm is placed under ultrasonic disruption machine, is 700W's in power
Under the conditions of ultrasound 40min obtain graphene, nanometer glass putty, polyacrylonitrile mixture.
After being washed by mixture, be freeze-dried 5h, it is placed in the furnace of nitrogen protection, controlled at 500 DEG C, calcining
5h can be prepared by lithium cell cathode material.Through testing, when current density is 100mA/g, after 150 circulations, specific capacity
For 511mA/g.
Embodiment 6-9 experimental result statistics:
The result shows that using the compound removing graphitic source of supercritical fluid plus high energy shear compared to chemical vapour deposition technique,
The cycle performance for the lithium cell cathode material being prepared is high, and specific capacity has been increased to 782mA/g from 511mA/g.Illustrate benefit
It is better than chemical vapour deposition technique with the compound removing graphitic source of supercritical fluid plus high energy shear, gained graphene can be significantly reduced
Size increases the specific capacity of lithium cell cathode material to improve the conductivity of graphene.
Finally, it is stated that in the description of this specification, reference term " embodiment ", " another embodiment ", " other
The description of embodiment " or " first embodiment~X embodiment " etc. means specific spy described in conjunction with this embodiment or example
Sign, structure, material or feature are included at least one embodiment or example of the invention.In the present specification, to above-mentioned
The schematic representation of term may not refer to the same embodiment or example.Moreover, description specific features, structure, material,
Method and step or feature can be combined in any suitable manner in any one or more of the embodiments or examples.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the device that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or device institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or device.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
The above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to preferred embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that, it can modify to technical solution of the present invention
Or equivalent replacement should all cover without departing from the objective and range of technical solution of the present invention in claim of the invention
In range.
Claims (10)
1. a kind of preparation method of lithium cell cathode material, which comprises the following steps:
Step A, graphene powder is prepared
(1) graphitic source, auxiliary intercalator are added in high-pressure reactor, and stirs and forms mixed liquor；
(2) when temperature reaches preset value in the reactor, it is passed through remover, is pressurized, in the case where making remover reach supercriticality
Continue stirring and carry out flowing 6-12 hours, decompression is deflated, and graphene solution is obtained；
(3) after centrifugation, washing, the freeze-drying graphite weak solution, graphene powder is obtained；
Step B, lithium cell cathode material is prepared
(1) graphene powder and nanometer glass putty, polyacrylonitrile are subjected to ultrasonic mixing, obtain graphene, nanometer glass putty, gathers
Acrylonitrile mixture,
(2) mixture is obtained into graphene, nanometer glass putty, polyacrylonitrile composite negative pole material through washing, freeze-drying, calcining
Material.
2. the preparation method of lithium cell cathode material according to claim 1, which is characterized in that described in step A (1)
Graphitic source is the graphite oxide solution obtained by oxidizer treatment, and the oxidant is selected from HNO3, H2SO4, HClO4And KMnO4
One of.
3. the preparation method of lithium cell cathode material according to claim 1, which is characterized in that the auxiliary intercalator
For one of dimethylformamide, methyl pyrrolidone, neopelex or lauryl sodium sulfate；The step
The mode that stirring in rapid A (1) forms mixed liquor is magnetic agitation, mixing speed 100-200r/min.
4. the preparation method of lithium cell cathode material according to claim 1, which is characterized in that the remover is dioxy
Change one of carbon, methanol or ethyl alcohol.
5. the preparation method of lithium cell cathode material according to claim 1, which is characterized in that pre- described in step A (2)
If value is 80-300 DEG C.
6. the preparation method of lithium cell cathode material according to claim 1, which is characterized in that the step A (3) it
Before, it further comprises the steps of:
The graphene solution is passed through into ultrasonic high-speed shearing machine, shear time 10-30min, the ultrasound high-speed shearing machine
Ultrasonic power is 1000-1200W.
7. the preparation method of lithium cell cathode material according to claim 1, which is characterized in that described in step B (1)
Ultrasonic mixing technique, ultrasonic time 30-60min, ultrasonic power 500-800W.
8. the preparation method of lithium cell cathode material according to claim 1, which is characterized in that described in step B (1)
Graphene powder, nanometer glass putty, polyacrylonitrile mass ratio are as follows: the partial size of 0.2-0.8:2-8:2-4, the nanometer glass putty is
20-60nm。
9. the preparation method of lithium cell cathode material according to claim 1, which is characterized in that described in step B (2)
Calcine technology is specially that graphene, nanometer glass putty, polyacrylonitrile mixture are placed in the furnace of nitrogen protection, controlled at
400-500 DEG C, calcine 5-10h.
10. a kind of lithium ion battery negative electrode, which is characterized in that including negative current collector and be coated in the negative current collector
The cathode membrane on surface, the cathode membrane include the preparation of lithium cell cathode material of any of claims 1-9
Graphene, the nanometer glass putty, polyacrylonitrile composite negative pole material of method preparation.
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Cited By (2)
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| WO2021017814A1 (en) * | 2019-07-29 | 2021-02-04 | 宁德时代新能源科技股份有限公司 | Negative electrode active material, preparation method therefor, secondary battery and battery module, battery pack and device associated therewith |
| WO2021017810A1 (en) * | 2019-07-29 | 2021-02-04 | 宁德时代新能源科技股份有限公司 | Negative electrode active material, preparation method therefor, secondary battery and battery module, battery pack and device associated therewith |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021017814A1 (en) * | 2019-07-29 | 2021-02-04 | 宁德时代新能源科技股份有限公司 | Negative electrode active material, preparation method therefor, secondary battery and battery module, battery pack and device associated therewith |
| WO2021017810A1 (en) * | 2019-07-29 | 2021-02-04 | 宁德时代新能源科技股份有限公司 | Negative electrode active material, preparation method therefor, secondary battery and battery module, battery pack and device associated therewith |
| EP3799163A4 (en) * | 2019-07-29 | 2021-08-25 | Contemporary Amperex Technology Co., Limited | Negative electrode active material, preparation method therefor, secondary battery and battery module, battery pack and device associated therewith |
| EP3799164A4 (en) * | 2019-07-29 | 2021-08-25 | Contemporary Amperex Technology Co., Limited | Negative electrode active material, preparation method therefor, secondary battery and battery module, battery pack and device associated therewith |
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