CN105406039B - A kind of silicon-carbon cathode slurry and preparation method thereof - Google Patents
A kind of silicon-carbon cathode slurry and preparation method thereof Download PDFInfo
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- CN105406039B CN105406039B CN201510737797.8A CN201510737797A CN105406039B CN 105406039 B CN105406039 B CN 105406039B CN 201510737797 A CN201510737797 A CN 201510737797A CN 105406039 B CN105406039 B CN 105406039B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
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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
- H01M4/38—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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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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 present invention relates to a kind of silicon-carbon cathode slurry and preparation method thereof, belong to technical field of lithium ion.The silicon-carbon cathode pulp components include the water-based binders for electrodes of acrylonitrile multi-component copolymer LA types, carbon black Super p conductive agents, single armed CNT suspension emulsion, silicon-carbon/CNT composite negative pole material and deionized water.The cathode size preparation method is（1）The acrylonitrile water-based binders for electrodes of multi-component copolymer LA types is added in planetary mixer with deionized water and stirred, and prepares binder solution stand for standby use；（2）Carbon black Super p conductive agents powders are put into wet ball-milling in planetary ball mill with single armed CNT suspension emulsion；（3）The two kinds of conductive agents mixed are put into planetary mixer with silicon-carbon/CNT composite negative pole material and carry out thick material stirring；（4）Add binder solution to mix, be eventually adding deionized water stirring and adjusting cathode size viscosity, slurry sieving.
Description
Technical field
The invention belongs to technical field of lithium batteries, is specifically related to a kind of silicon-carbon cathode slurry and preparation method thereof.
Background technology
Lithium ion battery energy density is big, has extended cycle life, and high rate performance and has a safety feature, green, turns into main
Want energy products.With the rapid development of electronics technology, electronics and power product increasingly minimizes and lightweight, lithium-ion electric
Pond performance requirement more and more higher, the especially requirement of lithium ion battery energy density, while performance is not influenceed, lithium from
Sub- battery request has higher energy density.People are while by constantly seeking and improving positive electrode specific capacity also continuous
Seek and improve cathode specific capacity to improve lithium ion battery energy density.
Graphite negative electrodes material due to intrinsic advantages such as preferable cycle performances, most widely being applied, but
Graphite negative electrodes material lithium storage content is relatively low, and intercalation potential, close to lithium metal current potential, high magnification charging is difficult and safety be present
Hidden danger.For silicon-carbon composite cathode material as the late comer of lithium ion battery negative material, lithium storage content is higher, but electric conductivity and
Cycle performance is relatively poor, and predominantly silicon carbon material has bulk effect under the conditions of high level deintercalation, causes charge and discharge process
Middle material and collector come off, and influence the cycle performance of battery, so prepared by rational conductive agent and binding agent and slurry
Technique is most important to silicon-carbon cathode material cycle performance.
The content of the invention
It is an object of the invention to provide a kind of silicon-carbon cathode slurry and preparation method thereof, technical problems to be solved are to find
Rational cathode conductive agent and binding agent, and blank preparation technicses, improve the cycle performance of silicon-carbon cathode material.
The present invention is realized by following technical proposals.
A kind of silicon-carbon cathode slurry and preparation method thereof, it is characterized in that：A kind of silicon-carbon cathode pulp components include acrylonitrile
The water-based binders for electrodes of multi-component copolymer LA types, carbon black Super-p conductive agents, single armed CNT suspension emulsion, silicon-carbon/carbon nanometer
Pipe composite negative pole material and deionized water.
A kind of silicon-carbon cathode slurry and preparation method thereof, it is characterized in that：A kind of silicon-carbon cathode slurry preparation method it is specific
Step is：
（1）The acrylonitrile water-based binders for electrodes of multi-component copolymer LA types is added in planetary mixer with deionized water and stirred, and is made
Standby binder solution stand for standby use；
（2）It is wet that carbon black Super-p conductive agents powder with single armed CNT suspension emulsion is put into ball milling in planetary ball mill
It is mixed；
（3）The two kinds of conductive agents mixed are put into planetary mixer and carried out with silicon-carbon/CNT composite negative pole material
Thick material stirring；
（4）Add binder solution to mix, be eventually adding deionized water stirring and adjusting cathode size viscosity, slurry mistake
150 ~ 200 mesh sieves.
A kind of above-mentioned silicon-carbon cathode slurry preparation method, it is characterised in that：Step（1）Described acrylonitrile multi-component copolymer
The water-based binders for electrodes of LA types is with deionized water with mass ratio 1:2 ~ 3 add, 1 ~ 2h of mixing time.
A kind of above-mentioned silicon-carbon cathode slurry preparation method, it is characterised in that：Step（2）Described carbon black Super-p is led
Electric agent powder is with single armed CNT suspension emulsion with mass ratio 1:55 ~ 56 add, 1 ~ 2h of mixing time.
A kind of above-mentioned silicon-carbon cathode slurry preparation method, it is characterised in that：Step（3）Described mix two kinds are led
Electric agent is with silicon-carbon/CNT composite negative pole material with mass ratio 1:1.8 ~ 1.9 add, 1 ~ 2h of mixing time.
A kind of above-mentioned silicon-carbon cathode slurry preparation method, it is characterised in that：Step（4）The binding agent of described addition is molten
Liquid is with silicon-carbon/CNT composite negative pole material with mass ratio 1:1.3 ~ 1.4 add, 2 ~ 3h of mixing time, cathode size viscosity
Adjust to 2000 ~ 6000mpa.s.
Advantages of the present invention is with effect：
Silicon-carbon cathode active material uses silicon-carbon/CNT composite negative pole material, and conductive agent is mixed using carbon black Super-p
Enter part carbon nanotube conducting agent, carbon nanotube conducting agent and the carbon structure phase of silicon-carbon/CNT composite negative pole material outer layer
Seemingly, both readily available preferably connections, add tightness degrees of negative material, improve negative material compacted density and
Electric conductivity, be advantageous to the cycle performance lifting of battery.
Conductive agent uses acrylonitrile multi-component copolymer using carbon black Super-p incorporation part carbon nanotube conducting agent, binding agent
Aqueous dispersions, carbon nanotube conducting agent and acrylonitrile multi-component copolymer aqueous dispersions binding agent have preferable ductility, Ke Yicheng
By the expansion repeatedly of silicon-carbon composite cathode material volume with shrinking, be advantageous to improve the cycle performance of material.
Conductive agent is beaten with silicon-carbon/CNT composite negative pole material is thick again after carrying out ball milling using ball mill, finally and glue
Dispersion soln mixes.The thick mixing uniformity beaten the frictional force that can increase between material granule, improve material of mixing material,
Finally mixed with binder solution, reduce the destruction to colloform texture, be advantageous to the processing characteristics of slurry.
Brief description of the drawings
Fig. 1 is that cathode size prepares 20Ah-3.2V soft-package battery cycle performance curve maps in embodiment.
Embodiment
The present invention uses following technical scheme：Silicon-carbon cathode pulp components include the water-based electrode of acrylonitrile multi-component copolymer LA types
Binding agent, carbon black Super-p conductive agents, single armed CNT suspension emulsion, silicon-carbon/CNT composite negative pole material and go from
Sub- water.
By the acrylonitrile water-based binders for electrodes of multi-component copolymer LA types of solid content 15.0 ± 0.2% and deionized water with quality
Than 1：2 ~ 3 add 1 ~ 2h of stirring in planetary mixer, and 10 ~ 20r/min of revolution speed, rotational velocity is 500 ~ 800r/min, system
Standby binder solution stand for standby use.
By the single armed CNT suspension emulsion of carbon black Super-p conductive agents powder and solid content 0.2 ± 0.01% with quality
Than 1：55 ~ 56 are put into wet ball-milling in planetary ball mill, 10 ~ 30r/min of revolution speed, 50 ~ 80r/min of rotational velocity, ball milling
1 ~ 2h of time.
By mix two kinds of conductive agents and silicon-carbon/CNT composite negative pole material with mass ratio 1：1.8 ~ 1.9 are put into
Carrying out thick material stirring, 10 ~ 15r/min of revolution speed in planetary mixer, rotational velocity is 500 ~ 800r/min, mixing time 1 ~
2h。
Add binder solution mixing, binder solution and the silicon-carbon/CNT composite negative pole material of addition
Mass ratio is 1：1.3 ~ 1.4,10 ~ 20r/min of revolution speed, rotational velocity are 600 ~ 1000r/min, 2 ~ 3h of mixing time, most
Deionized water stirring and adjusting cathode size viscosity is added afterwards to 2000 ~ 7000mpa.s, solid content 40 ~ 50%.Slurry crosses 150 ~ 200
Mesh sieve.
Embodiment
By the water-based binders for electrodes LA133 of acrylonitrile multi-component copolymer LA types of solid content 15.0 ± 0.2%（Chengdu mattress it is happy
Power Technology Co., Ltd.）25 ± 0.005kg mixes with 62.5 ± 0.005kg of deionized water adds planetary mixer（Guangzhou is red
Transport mixing apparatus Co., Ltd HY-DLH (100L)）Middle stirring 1 ~ 2h, 10 ~ 20r/min of revolution speed, rotational velocity is 500 ~
800r/min, prepare binder solution stand for standby use.
By 1 ± 0.005kg carbon black Super-p conductive agent powders（Shanghai Hui Pu industrial chemicals Co., Ltd）With 55 ±
The single armed CNT suspension emulsion of 0.005kg solid contents 0.2 ± 0.01%（European OCSiAl company's Ts UBALL SWCNT）It is average
Mixing is put into planetary ball mill（Changsha meter Qi experimental instruments and equipment limiteds MITR-QM-QX-100L）In four alumina balls grinding jars
Wet ball-milling, alumina balls diameter 3mm, ball 50 ± 0.1kg of gross mass, revolution speed 20r/min, rotational velocity 60r/min, ball
Consume time 2h.
Take the two kinds of conductive agents and 96 ± 0.005kg silicon-carbons/CNT composite negative pole material that 50.9 ± 0.005kg is mixed
Material mixing is put into planetary mixer（Guangzhou good luck mixing apparatus Co., Ltd HY-DLH (200L)）It is middle to carry out thick material stirring, revolution
Speed 15r/min, rotational velocity 500r/min, mixing time 1h.
Add the mixing of 70 ± 0.005kg binder solutions, revolution speed 20r/min, rotational velocity 1000r/
Min, mixing time 3h, 0.490 ± 0.005kg deionized waters stirring and adjusting cathode size viscosity is eventually adding to 6500mpa.s,
Solid content 46%, slurry cross 150 mesh sieves, obtain cathode size.
20Ah-3.2V soft bag lithium ionic cells are prepared using cathode size matching iron phosphate lithium positive pole active material to survey
Examination, battery weight specific capacity reach 160 ~ 162Wh/kg, and 20Ah-3.2V lithiums are prepared using graphite negative electrodes material compared with traditional handicraft
Ion battery gravimetric specific energy at least improves 5%, and 1C charge and discharges cycle life is kept for more than 2000 times, and cycle performance curve is such as
Shown in Fig. 1.
Technical scheme is described in detail embodiment described above, it should be understood that it is described above only
For the specific embodiment of the present invention, it is not intended to limit the invention, all any modifications made in the spirit of the present invention
With improve etc., should be included in the scope of the protection.
Claims (6)
1. a kind of silicon-carbon cathode slurry, it is characterized in that, component includes：The water-based binders for electrodes of acrylonitrile multi-component copolymer LA types, charcoal
Black Super-p conductive agents, single armed CNT suspension emulsion, silicon-carbon/CNT composite negative pole material and deionized water.
2. a kind of preparation method of silicon-carbon cathode slurry, it is characterized in that, comprise the concrete steps that：
（1）The acrylonitrile water-based binders for electrodes of multi-component copolymer LA types is added in planetary mixer with deionized water and stirred, and is prepared viscous
Tie agent solution stand for standby use；
（2）Carbon black Super-p conductive agents powder is put into wet ball-milling in planetary ball mill with single armed CNT suspension emulsion；
（3）The two kinds of conductive agents mixed are put into planetary mixer with silicon-carbon/CNT composite negative pole material and carry out thick material
Stirring；
（4）Adding binder solution to mix, be eventually adding deionized water stirring and adjusting cathode size viscosity, slurry crosses 150 ~
200 mesh sieves.
3. the preparation method as described in claim 2, it is characterised in that：Step（1）Described acrylonitrile multi-component copolymer LA types
Water-based binders for electrodes is with deionized water with mass ratio 1:2 ~ 3 add, 1 ~ 2h of mixing time.
4. the preparation method as described in claim 2, it is characterised in that：Step（2）Described carbon black Super-p conductive agent powder
Body is with single armed CNT suspension emulsion with mass ratio 1:55 ~ 56 add, 1 ~ 2h of mixing time.
5. the preparation method as described in claim 2, it is characterised in that：Step（3）Described mix two kinds of conductive agents with
Silicon-carbon/CNT composite negative pole material is with mass ratio 1:1.8 ~ 1.9 add, 1 ~ 2h of mixing time.
6. the preparation method as described in claim 2, it is characterised in that：Step（4）The binder solution and silicon of described addition
Carbon/CNT composite negative pole material is with mass ratio 1:1.3 ~ 1.4 add, 2 ~ 3h of mixing time, the regulation of cathode size viscosity
To 2000 ~ 6000mpa.s.
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| KR102036471B1 (en) * | 2016-04-28 | 2019-10-25 | 가부시키가이샤 인비젼 에이이에스씨 재팬 | Nonaqueous electrolyte secondary battery |
| CN106560940A (en) * | 2016-08-17 | 2017-04-12 | 深圳市优特利电源有限公司 | High volume capacity silicon carbon negative electrode and preparation method thereof, and lithium ion battery |
| CN106560943A (en) * | 2016-08-17 | 2017-04-12 | 深圳市优特利电源有限公司 | Silicon-carbon negative electrode and preparation method thereof, and lithium ion battery |
| CN108321340A (en) * | 2018-02-06 | 2018-07-24 | 北京国能电池科技股份有限公司 | The stirring means of ceramic slurry |
| CN109686979B (en) * | 2018-12-12 | 2021-07-06 | 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 |
| CN110190249A (en) * | 2019-04-19 | 2019-08-30 | 合肥国轩高科动力能源有限公司 | A kind of conjunction paste-making method of silicon-carbon cathode |
| CN112133911A (en) * | 2020-10-09 | 2020-12-25 | 浙江锋锂新能源科技有限公司 | Lithium ion battery cathode slurry and preparation method thereof |
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| CN102683034B (en) * | 2012-04-28 | 2015-03-25 | 中国科学院电工研究所 | Method for preparing super capacitor electrode plate |
| CN102903896B (en) * | 2012-10-22 | 2015-07-29 | 深圳清华大学研究院 | For the silicon-carbon composite cathode material of lithium ion battery, its preparation method and application |
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