CN109473648A - A kind of Silicon-carbon composite material for lithium ion battery and preparation method thereof - Google Patents
A kind of Silicon-carbon composite material for lithium ion battery and preparation method thereof Download PDFInfo
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- CN109473648A CN109473648A CN201811303288.4A CN201811303288A CN109473648A CN 109473648 A CN109473648 A CN 109473648A CN 201811303288 A CN201811303288 A CN 201811303288A CN 109473648 A CN109473648 A CN 109473648A
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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
- H01M4/366—Composites as layered products
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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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- 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
- H01M4/62—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
- 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
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a kind of Silicon-carbon composite material for lithium ion battery, it is made of presoma kernel and modified high-molecular clad, presoma kernel includes that nano silica fume, cracking carbon source and graphite powder are made, modified high-molecular clad is made of covering, and covering includes ethyl cellulose or Kynoar；It can inhibit the volume expansion of nano-silicon carbon dust, effectively so as to improve the cycle performance and capacity of lithium ion battery.The present invention provides a kind of preparation methods of Silicon-carbon composite material for lithium ion battery simultaneously, simple, efficient, have obtained a kind of Silicon-carbon composite material for lithium ion battery with excellent service performance.
Description
Technical field
The present invention relates to technical field of lithium ion, more particularly to a kind of surface coating modification polymeric membrane
Silicon-carbon composite material for lithium ion battery and preparation method thereof
Background technique
The theoretical lithium storage content of silicon is more than 10 times of graphite material capacity, but silicon in charge and discharge process with lithium ion
Insertion with abjection generate be more than 300% volume change, so that it is fallen off from copper foil current collector；The volume of simultaneous silicon
Expansion and contraction, the SEI film that surface is formed can constantly rupture and consume active material, the new SEI for forming electrolyte
Film persistent loop is destroyed, and battery capacity is caused to decay rapidly, and the poor circulation of battery and capacity is caused to reduce.Silicon simultaneously
It there is no electric conductivity, be unfavorable for the performance of lithium storage content.By be by silicon materials nanosizing and Composite commonly can be with
Effectively solves the problems, such as that silica-base material cycle life decays rapidly method, uses nano silica fume at present and graphite is compound prepares silicon-carbon
Composite negative pole material is common method, can improve the gentle solution volume expansion of electric conductivity of silicon materials.
But graphite and nano silica fume compound tense are used, due to the volume change of nano silica fume in charge and discharge process, easily
It loses and contacts with graphite, to be unfavorable for playing capacity, so how to further increase nano silica fume and graphite is compound later
Silicon-carbon composite cathode material chemical property is urgent problem,
Summary of the invention
In view of this, the present invention provides a kind of Silicon-carbon composite material for lithium ion battery and preparation method thereof, preparation side
Method is simple, efficient, and a kind of obtained Silicon-carbon composite material for lithium ion battery is coated with modified high-molecular film, Ke Yiyou on surface
Effect inhibits the volume expansion of nano-silicon carbon dust, so as to improve the cycle performance and capacity of lithium ion battery.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of Silicon-carbon composite material for lithium ion battery, which is characterized in that coated by presoma kernel and modified high-molecular
Layer composition, the presoma kernel include nano silica fume, cracking carbon source and graphite powder be made, the modified high-molecular clad by
Covering is made, and the covering includes ethyl cellulose or Kynoar.
The beneficial effect of above-mentioned optimal technical scheme is: a kind of lithium ion battery silicon-carbon composite wood disclosed by the invention
Material can reduce charge and discharge by coating one layer of modified high-molecular film with obdurability on silicon-carbon composite cathode material surface
The volume expansion of nano silica fume particle in the process so that nano silica fume particle be avoided to fall off from graphite particle, and then can mention
The first charge discharge efficiency and cyclical stability of high silicon-carbon composite negative pole material；Wherein nano silica fume can be closely adhered to by cracking carbon source
The stability of Si-C composite material is improved on graphite particle surface.
Preferably, it is grouped as by the group of following parts by weight: 98%~90% presoma kernel and 2%~10% modified high score
Attached bag coating.
Preferably, include following weight percentage components in the presoma kernel: the content of 10% nano silica fume,
5% cracking carbon source and 85% graphite.
Preferably, the cracking carbon source includes citric acid, glucose or sucrose.
The invention also discloses a kind of preparation methods of Silicon-carbon composite material for lithium ion battery, which is characterized in that specific
Using following steps:
(1) nano silica fume, cracking carbon source, stone are weighed according to a kind of Silicon-carbon composite material for lithium ion battery as described above
Ink powder and covering, it is spare；
(2) it prepares presoma kernel: presoma kernel is prepared by nano silica fume, cracking carbon source and graphite powder；
(3) it prepares modified high-molecular clad: covering is coated in the above-mentioned presoma core surface being prepared
To modified high-molecular clad, a kind of lithium ion battery carbon-silicon composite material can be prepared.
The beneficial effect of above-mentioned optimal technical scheme is: preparation method process disclosed by the invention is simple, first prepares forerunner
Then internal core directly forms modified high-molecular film in presoma core surface, it is multiple that lithium ion battery silicon-carbon can be obtained
Condensation material simplifies process flow, so as to improve working efficiency.
Preferably, the step (2) specifically comprises the following steps:
(A) by step (1) nano silica fume and cracking carbon source be added to deionized water and the in the mixed solvent of alcohol into
Row ultrasonic treatment, the suspension that can be obtained；
(B) suspension that step (A) obtains is stirred, graphite powder is then added, being uniformly mixed can be obtained slurry；
(C) slurry that step (B) obtains is dried, is then added to vacuum carburization furnace and carries out carbonization treatment
Obtain presoma kernel.
The beneficial effect of above-mentioned optimal technical scheme is: the present invention first passes through ultrasonic treatment for nano silica fume and cracking carbon source
It is evenly dispersed in the mixed solvent, the suspension uniform properties that make, stabilization；Then graphite powder is added after stirring, it can
To improve the uniformity of slurry, nano silica fume is reduced in the reunion on graphite particle surface；Vacuum carburization is carried out after drying to be made
Carbon source carbonization is cracked, the stability of presoma kernel is improved.
Preferably, the in the mixed solvent deionized water and the volume ratio of alcohol are 50:50~90:10.
Preferably, speed of agitator is 1000~2000r/min in the step (B), mixing time is 0.5~1h.
Preferably, drying mode is spray drying, freeze-drying or drying in the step (C)；Carbonization treatment be
Under vacuum condition, with 600-1000 DEG C of temperature carbonization treatment 2-5h.
Preferably, the step (3) specifically comprises the following steps:
A, the covering in step (1) is dissolved in organic solvent, the presoma kernel in step (2) is then added,
It stirs evenly and mixed system can be obtained；
B, by mixed system heat drying while stirring, continue to be heated to covering melting, add into deionized water
Finally a kind of Silicon-carbon composite material for lithium ion battery can be obtained by drying in chilling.
The beneficial effect of above-mentioned optimal technical scheme is: it is molten that covering is dissolved formation mixing by the present invention in organic solvent
Liquid keeps covered effect more uniform so as to realize cladding under the conditions of liquid；In addition, the present invention is after covering melting
It may be implemented to stablize cladding, so that surface coated macromolecule is sharply shunk raising cladding stability using chilling, and can be with
Improve performance, enhances toughness.
Preferably, in the step A content of covering in the solution be 0.8~4wt.%, speed of agitator be 100~
200r/min, mixing time are 0.5~1h；The organic solvent includes alcohol, acetone, dimethyl acetamide or N- methylpyrrole
Alkanone.
Preferably, being heated to 170~310 DEG C in the step B melts covering.
It can be seen via above technical scheme that compared with prior art, the present disclosure provides a kind of lithium ion batteries
It can by coating one layer of modified high-molecular film with obdurability on silicon-carbon composite cathode material surface with Si-C composite material
To reduce the volume expansion of nano silica fume particle in charge and discharge process, so that nano silica fume particle be avoided to take off from graphite particle
It falls, and then the first charge discharge efficiency and cyclical stability of silicon-carbon composite cathode material can be improved；Also disclose a kind of lithium-ion electric
The preparation method of pond Si-C composite material, preparation flow is simple, high production efficiency.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the silicon-carbon composite cathode material SEM shape appearance figure that the embodiment of the present invention 1 is prepared；
Fig. 2 is the silicon-carbon composite cathode material SEM shape appearance figure that comparative example 1 of the present invention is prepared；
Fig. 3 is that negative electrode tab is made in Si-C composite material made from 1-4 of the embodiment of the present invention, comparative example 1, is then assembled into
The obtained capacity retention ratio curve graph tested after 2032 button cells.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a kind of Silicon-carbon composite material for lithium ion battery, by presoma kernel and modified high score
Attached bag coating composition, presoma kernel include that nano silica fume, cracking carbon source and graphite powder are made, and modified high-molecular clad is by wrapping
It covers agent to be made, covering includes ethyl cellulose or Kynoar.
Wherein the parts by weight of each component are as follows: 98%~90% presoma kernel and 2%~10% modified high-molecular
Clad.
It wherein, include following weight percentage components in presoma kernel: the content of 10% nano silica fume, 5% cracking
Carbon source and 85% graphite.
Wherein, cracking carbon source includes citric acid, glucose or sucrose.
It is specific using such as the embodiment of the invention also discloses a kind of preparation method of Silicon-carbon composite material for lithium ion battery
Lower step:
(1) nano silica fume, cracking carbon source, stone are weighed according to a kind of Silicon-carbon composite material for lithium ion battery as described above
Ink powder and covering, it is spare；
(2) presoma kernel is prepared
(A) by step (1) nano silica fume and cracking carbon source be added to deionized water and the in the mixed solvent of alcohol into
Row ultrasonic treatment, the suspension that can be obtained；In the mixed solvent deionized water and the volume ratio of alcohol are 50:50~90:10
(B) suspension for obtaining step (A) stirs 0.5~1h under 1000~2000r/min revolving speed, and stone is then added
Ink powder, being uniformly mixed can be obtained slurry；
(C) slurry that step (B) obtains is dried, is then added into vacuum carburization furnace, under vacuum conditions, with
600-1000 DEG C of temperature carbonization treatment 2-5h, can be obtained presoma kernel.
(3) modified high-molecular clad is prepared
A, the covering in step (1) is dissolved in organic solvent, obtaining cladding agent content is the molten of 0.8~4wt.%
Then liquid is added the presoma kernel in step (2), 0.5~1h is stirred under 100~200r/min revolving speed, can be obtained mixed
Zoarium system；
B, by mixed system heat drying while stirring, continue to be heated to 170~310 DEG C to melt covering, add
Finally a kind of Silicon-carbon composite material for lithium ion battery can be obtained by drying in the chilling into deionized water.
For further optimisation technique scheme, in the step (C) drying mode be spray drying, freeze-drying or
Drying.
For further optimisation technique scheme, covering exists in the step A, and speed of agitator is；The organic solvent
Including alcohol, acetone, dimethyl acetamide or N-Methyl pyrrolidone.
Embodiment 1
The embodiment of the present invention 1 discloses a kind of Silicon-carbon composite material for lithium ion battery, by 98% presoma kernel and 2%
Modified high-molecular clad composition, presoma kernel are made of 10% nano silica fume, 5% cracking carbon source and 85% graphite powder, change
Property polymeric PTC materials layer is made of ethyl cellulose.
The embodiment of the present invention 1 also discloses a kind of preparation method of Silicon-carbon composite material for lithium ion battery, specific to use
Following steps:
(1) nano silica fume, cracking carbon source, stone are weighed according to a kind of Silicon-carbon composite material for lithium ion battery as described above
Ink powder and covering, it is spare；
(2) presoma kernel is prepared
(A) in the mixed solvent to deionized water and alcohol, shape is added with cracking carbon source in the nano silica fume in step (1)
It at the mixed solution comprising 4wt.% nano silica fume, 2wt.% citric acid, is then ultrasonically treated, the suspension that can be obtained
Liquid；In the mixed solvent deionized water and the volume ratio of alcohol are 90:10；
(B) suspension that step (A) obtains is stirred into 1h under 1000r/min revolving speed, graphite powder is then added, mixing is equal
The even slurry that the graphite powder containing 34wt.% can be obtained；
(C) slurry that step (B) obtains is spray-dried, is then added into vacuum carburization furnace, in vacuum condition
Under, with 600 DEG C of temperature carbonization treatment 5h, presoma kernel can be obtained.
(3) modified high-molecular clad is prepared
A, ethyl cellulose is dissolved in alcohol, obtain cellulose content be 0.8wt.% solution, then plus
Enter presoma kernel, stirs 1h under 100r/min revolving speed, mixed system can be obtained；
B, by mixed system heat drying while stirring, continue to be heated to 170 DEG C to melt covering, add to go from
Finally a kind of Silicon-carbon composite material for lithium ion battery can be obtained by drying in chilling in sub- water.
Embodiment 2
The embodiment of the present invention 2 discloses a kind of Silicon-carbon composite material for lithium ion battery, by 98wt.% presoma kernel and
2wt.% modified high-molecular clad composition, presoma kernel is by 10% nano silica fume, 5% cracking carbon source and 85% graphite powder system
At modified high-molecular clad is made of Kynoar.
The embodiment of the present invention 2 also discloses a kind of preparation method of Silicon-carbon composite material for lithium ion battery, specific to use
Following steps:
(1) nano silica fume, cracking carbon source, stone are weighed according to a kind of Silicon-carbon composite material for lithium ion battery as described above
Ink powder and covering, it is spare；
(2) presoma kernel is prepared
(A) in the mixed solvent to deionized water and alcohol, shape is added with cracking carbon source in the nano silica fume in step (1)
It at the mixed solution comprising 4wt.% nano silica fume, 2wt.% citric acid, is then ultrasonically treated, the suspension that can be obtained
Liquid；In the mixed solvent deionized water and the volume ratio of alcohol are 90:10；
(B) suspension that step (A) obtains is stirred into 0.5h under 2000r/min revolving speed, graphite powder is then added, mixed
The slurry of the graphite powder containing 34wt.% uniformly can be obtained；
(C) slurry that step (B) obtains is spray-dried, is then added into vacuum carburization furnace, in vacuum condition
Under, with 1000 DEG C of temperature carbonization treatment 2h, presoma kernel can be obtained.
(3) modified high-molecular clad is prepared
A, presoma kernel and 10% Kynoar, spare in the step of weighing 90% (2)；By Kynoar two
It is dissolved in methylacetamide, obtains the solution that Kynoar content is 4wt.%, presoma kernel is then added, in 200r/
0.5h is stirred under min revolving speed, mixed system can be obtained；
B, by mixed system heat drying while stirring, continue to be heated to 250 DEG C to melt covering, add to go from
Finally a kind of Silicon-carbon composite material for lithium ion battery can be obtained by drying in chilling in sub- water.
Embodiment 3
The embodiment of the present invention 3 discloses a kind of Silicon-carbon composite material for lithium ion battery, by 95% presoma kernel and 5%
Modified high-molecular clad composition, presoma kernel are made of 10% nano silica fume, 5% cracking carbon source and 85% graphite powder, change
Property polymeric PTC materials layer is made of Kynoar.
The embodiment of the present invention 3 also discloses a kind of preparation method of Silicon-carbon composite material for lithium ion battery, specific to use
Following steps:
(1) nano silica fume, cracking carbon source, stone are weighed according to a kind of Silicon-carbon composite material for lithium ion battery as described above
Ink powder and covering, it is spare；
(2) presoma kernel is prepared
(A) in the mixed solvent to deionized water and alcohol, shape is added with cracking carbon source in the nano silica fume in step (1)
It at the mixed solution comprising 4wt.% nano silica fume, 2wt.% citric acid, is then ultrasonically treated, the suspension that can be obtained
Liquid；In the mixed solvent deionized water and the volume ratio of alcohol are 90:10；
(B) suspension that step (A) obtains is stirred into 0.5h under 2000r/min revolving speed, graphite powder is then added, mixed
The slurry of the graphite powder containing 34wt.% uniformly can be obtained；
(C) slurry that step (B) obtains is spray-dried, is then added into vacuum carburization furnace, in vacuum condition
Under, with 1000 DEG C of temperature carbonization treatment 2h, presoma kernel can be obtained.
(3) modified high-molecular clad is prepared
A, Kynoar is dissolved in dimethyl acetamide, obtains the solution that Kynoar content is 2wt.%,
Then presoma kernel is added, stirs 0.5h under 150r/min revolving speed, mixed system can be obtained；
B, by mixed system heat drying while stirring, continue to be heated to 300 DEG C to melt covering, add to go from
Finally a kind of Silicon-carbon composite material for lithium ion battery can be obtained by drying in chilling in sub- water.
Embodiment 4
The embodiment of the present invention 4 discloses a kind of Silicon-carbon composite material for lithium ion battery, by 98% presoma kernel and 2%
Modified high-molecular clad composition, presoma kernel are made of 10% nano silica fume, 5% cracking carbon source and 85% graphite powder, change
Property polymeric PTC materials layer is made of Kynoar.
The embodiment of the present invention 4 also discloses a kind of preparation method of Silicon-carbon composite material for lithium ion battery, specific to use
Following steps:
(1) nano silica fume, cracking carbon source, stone are weighed according to a kind of Silicon-carbon composite material for lithium ion battery as described above
Ink powder and covering, it is spare；
(2) presoma kernel is prepared
(A) in the mixed solvent to deionized water and alcohol, shape is added with cracking carbon source in the nano silica fume in step (1)
It at the mixed solution comprising 4wt.% nano silica fume, 2wt.% citric acid, is then ultrasonically treated, the suspension that can be obtained
Liquid；In the mixed solvent deionized water and the volume ratio of alcohol are 90:10；
(B) suspension that step (A) obtains is stirred into 0.5h under 2000r/min revolving speed, graphite powder is then added, mixed
The slurry of the graphite powder containing 34wt.% uniformly can be obtained；
(C) slurry that step (B) obtains is spray-dried, is then added into vacuum carburization furnace, in vacuum condition
Under, with 1000 DEG C of temperature carbonization treatment 2h, presoma kernel can be obtained.
(3) modified high-molecular clad is prepared
A, Kynoar is dissolved in dimethyl acetamide, obtaining Kynoar content is the molten of 0.8wt.%
Then liquid is added presoma kernel, stirs 0.5h under 200r/min revolving speed, mixed system can be obtained；
B, by mixed system heat drying while stirring, continue to be heated to 250 DEG C to melt covering, add to go from
Finally a kind of Silicon-carbon composite material for lithium ion battery can be obtained by drying in chilling in sub- water.
Comparative example 1
The presoma kernel that 1 step of Example (2) is prepared is assembled into 2032 button cell test loop service life, material
Expect that performance data is as shown in table 1, capacity retention ratio curve is as shown in Figure 3.
By preparation of silicon carbon composite materials made from the present embodiment at negative electrode tab, it was assembled into for 2032 button cell test loop longevity
Life, material characteristic data is as shown in table 1, and capacity retention ratio curve is as shown in Figure 3.The test method of cycle performance of battery are as follows: first
Be discharged to 0.01v with the current density of 100mA/g, then put with the electric current of 10mA/g to 0.005v, stand 3min, then with
The current density of 100mA/g charges to 1.5v, as a loop test cycle performance.
Table 1
Can obviously be learnt by the data in above-mentioned table 1: the lithium ion battery that the embodiment of the present invention 1~4 is prepared is used
Si-C composite material can significantly improve the reversible capacity for the first time of lithium ion battery, first charge discharge efficiency, while lithium ion can be improved
The circulating and reversible capacity and conservation rate of battery improve the recycling performance of lithium ion battery.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of Silicon-carbon composite material for lithium ion battery, which is characterized in that by presoma kernel and modified high-molecular clad
Composition, the presoma kernel include that nano silica fume, cracking carbon source and graphite powder are made, and the modified high-molecular clad is by wrapping
It covers agent to be made, the covering includes ethyl cellulose or Kynoar.
2. a kind of Silicon-carbon composite material for lithium ion battery according to claim 1, which is characterized in that by following parts by weight
Group be grouped as: 98%~90% presoma kernel and 2%~10% modified high-molecular clad.
3. a kind of preparation method of Silicon-carbon composite material for lithium ion battery, which is characterized in that specifically use following steps:
(1) a kind of Silicon-carbon composite material for lithium ion battery described in any one weighs nano-silicon according to claim 1~2
Powder, cracking carbon source, graphite powder and covering, it is spare；
(2) it prepares presoma kernel: presoma kernel is prepared by nano silica fume, cracking carbon source and graphite powder；
(3) it prepares modified high-molecular clad: covering being coated in the above-mentioned presoma core surface being prepared and is changed
Property polymeric PTC materials layer, can be prepared a kind of lithium ion battery carbon-silicon composite material.
4. a kind of preparation method of Silicon-carbon composite material for lithium ion battery according to claim 3, which is characterized in that institute
Step (2) is stated to specifically comprise the following steps:
(A) nano silica fume in step (1) is added with cracking carbon source to the in the mixed solvent of deionized water and alcohol and is surpassed
Sonication, the suspension that can be obtained；
(B) suspension that step (A) obtains is stirred, graphite powder is then added, being uniformly mixed can be obtained slurry；
(C) slurry that step (B) obtains is dried, is then added to vacuum carburization furnace and carries out carbonization treatment, can be obtained
Presoma kernel.
5. a kind of preparation method of Silicon-carbon composite material for lithium ion battery according to claim 4, which is characterized in that institute
The volume ratio for stating in the mixed solvent deionized water and alcohol is 50:50~90:10, the quality hundred of nano silica fume in the suspension
Divide ratio 4%.
6. a kind of preparation method of Silicon-carbon composite material for lithium ion battery according to claim 4, which is characterized in that institute
State in step (B) that speed of agitator is 1000~2000r/min, mixing time is 0.5~1h.
7. a kind of preparation method of Silicon-carbon composite material for lithium ion battery according to claim 4, which is characterized in that institute
Drying mode in step (C) is stated to be spray drying, be freeze-dried or dry；Carbonization treatment is under vacuum conditions, with 600-
1000 DEG C of temperature carbonization treatment 2-5h.
8. a kind of preparation method of Silicon-carbon composite material for lithium ion battery according to claim 3, which is characterized in that institute
Step (3) is stated to specifically comprise the following steps:
A, the covering in step (1) is dissolved in organic solvent, the presoma kernel in step (2), stirring is then added
Mixed system uniformly can be obtained；
B, by mixed system heat drying while stirring, continue to be heated to covering melting, add into deionized water chilling,
A kind of Silicon-carbon composite material for lithium ion battery finally can be obtained by drying.
9. a kind of preparation method of Silicon-carbon composite material for lithium ion battery according to claim 8, which is characterized in that institute
Stating the content of covering in the solution in step A is 0.8~4wt.%, and speed of agitator is 100~200r/min, and mixing time is
0.5~1h；The organic solvent includes alcohol, acetone, dimethyl acetamide or N-Methyl pyrrolidone.
10. a kind of lithium ion battery carbon-silicon composite material according to claim 8, which is characterized in that in the step B
Being heated to 170~310 DEG C melts covering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811303288.4A CN109473648B (en) | 2018-11-02 | 2018-11-02 | Silicon-carbon composite material for lithium ion battery and preparation method thereof |
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|---|---|---|---|
| CN201811303288.4A CN109473648B (en) | 2018-11-02 | 2018-11-02 | Silicon-carbon composite material for lithium ion battery and preparation method thereof |
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| CN109473648A true CN109473648A (en) | 2019-03-15 |
| CN109473648B CN109473648B (en) | 2022-09-02 |
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