CN106920955A - A kind of carbon point base silicon dioxide composite material and its application in electrode of lithium cell - Google Patents
A kind of carbon point base silicon dioxide composite material and its application in electrode of lithium cell Download PDFInfo
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- CN106920955A CN106920955A CN201710092604.7A CN201710092604A CN106920955A CN 106920955 A CN106920955 A CN 106920955A CN 201710092604 A CN201710092604 A CN 201710092604A CN 106920955 A CN106920955 A CN 106920955A
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- H—ELECTRICITY
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
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- 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
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- 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
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Abstract
The invention discloses a kind of carbon point base silicon dioxide composite material, it includes nano-scale carbon point and silicon dioxide nanosphere, wherein silicon dioxide nanosphere constitutes a network structure, carbon point is interspersed between in a network, the average grain diameter of the silicon dioxide nanosphere is between 10nm to 20nm, the average grain diameter of carbon point between 2nm to 6nm, the invention also discloses the application of the carbon point base silicon dioxide composite material in lithium battery is prepared.A kind of carbon point base silicon dioxide composite material disclosed by the invention and its application in electrode of lithium cell, belong to lithium battery preparation field.Carbon point base silicon dioxide composite material of the invention can reduce silica side reaction in the battery, this material is had specific capacity and more preferable cyclical stability higher.
Description
【Technical field】
The present invention relates to a kind of carbon point base silicon dioxide composite material, belong to silicon dioxide composite material field.The present invention
It is related to a kind of application of carbon point base silicon dioxide composite material in lithium battery is prepared, belongs to field of lithium.
【Background technology】
Maximum challenge is cleaning, reproducible energy substitution non-renewable energy resources in the range of the world today.By can be again
The raw energy, such as wind energy, tide energy, solar energy, the electric energy for obtaining is our main energy sources to be utilized following.These electric energy
Many modes that are stored with, thermal energy storage, such as storage heater can be converted into；Potential energy storage, such as waterpower can be converted into
Generate electricity；Chemical energy storage, such as battery can be converted into.In these energy storage modes, maximally effective is exactly battery storage.Mesh
Before for, lithium ion battery is, using most, to use battery widest in area.
In 20 th century laters, as lithium battery comes out, the advantage of lithium metal is set gradually to be presented in face of people.Lithium battery can
To bear big discharge-rate and specific capacity relatively higher, this battery is set to be quickly become computer, clock and watch, mobile phone, automobile etc.
The indispensable energy.But lithium battery has obvious shortcoming, lithium is separated out and grown up with dendritic crystal, in its charge and discharge process,
Extremely big Volume Changes cause the rapid cyclical stability of alloy electrode capacity attenuation poor, easily trigger safety problem.In order to avoid
This problem, there is two kinds of settling modes：Modified negative material, improves electrolyte prescription.Wherein, first way result in lithium from
The appearance of sub- battery, is not metal simple-substance due to lithium ion, fundamentally solves safety problem caused by branch crystallization.But
It is that this mode can cause the potential of negative pole to raise, and the increase of the potential of positive electrode is limited.Therefore many scholars open
Begin to explore new, suitable negative material.Whether transition metal oxide battery, or transient metal sulfide battery,
Have than larger progress under the probing into of global Study on Li-ion batteries scholar in past ten years.But to nonmetallic lithium battery
The research of electrode is not also a lot, and particularly the specific capacity of silica is very big in non-metal electrode, but its following in battery
To the destruction of the structure of battery than larger during ring, the cyclical stability of battery is too poor.Current nano level silica negative pole
Material, such as nanometer silica line, nano cubic, can be significantly greatly increased the stability of battery.Pure nano silicon is made
During for cell negative electrode material, physical agglomeration, physical chemistry corrosion and other side reactions are susceptible to, prepared by conventional method
Nano silicon has that dispersion is difficult.
【The content of the invention】
The present invention seeks to overcome the deficiencies in the prior art, there is provided a kind of carbon point base silicon dioxide composite material, the carbon
With silica as backing material, silicon dioxide nanosphere constitutes network structure to point base silicon dioxide composite material, and carbon is brought out into the open
It is inserted in wherein, such structural benefit resides in reduced silica side reaction in the battery, there is this material higher
Specific capacity and more preferable cyclical stability.
Present invention also offers a kind of preparation method of carbon point base silicon dioxide composite material, the preparation method uses two steps
Method synthesizes, i.e. hydro-thermal method and calcination method.By synthesizing the silicon dioxide nanosphere with chain radicals, Ran Hou at room temperature
Calcined at 400 DEG C, carbochain is condensed into carbon point, finally gives carbon point base silicon dioxide composite material.
Present invention also offers a kind of application of carbon point base silicon dioxide composite material in lithium battery is prepared.
The present invention is achieved by the following technical solutions：
A kind of carbon point base silicon dioxide composite material, it is characterised in that：Include nano-scale carbon point and silica nanometer
Microballoon, wherein silicon dioxide nanosphere constitute a network structure, in a network between be interspersed with carbon point, the silica is received
Between 10nm to 20nm, the average grain diameter of carbon point is between 2nm to 6nm for the average grain diameter of meter Wei Qiu.
Wherein, the silicon dioxide nanosphere be by deionized water, ammoniacal liquor, 3- aminopropyls-trimethoxy silane and
Tetraethyl orthosilicate is obtained under absolute ethyl alcohol environment.
Further, the silicon dioxide nanosphere can be obtained carbon point base silica composite wood after high-temperature calcination
Material.Wherein, the high-temperature calcination time is 2 hours, and temperature is 400 DEG C.
Deionized water, ammoniacal liquor, the addition ratio of 3- aminopropyls-trimethoxy silane, tetraethyl orthosilicate and absolute ethyl alcohol
It is 6~7：2：0.1~1.2：2~8：50.The hybrid reaction is carried out under room temperature environment, and the reaction time is 10 hours.
The carbon point base silicon dioxide composite material can launch the fluorescence of blue, green or red under ultraviolet light,
Its specific surface area is up to 389.18m2/ g, specific capacity is between 250mAh/g to 410mAh/g.
A kind of preparation method of carbon point base silicon dioxide composite material, comprises the following steps：
1) silicon dioxide nanosphere is prepared：By deionized water, ammoniacal liquor, 3- aminopropyls-trimethoxy silane, positive silicic acid four
Ethyl ester is added in absolute ethyl alcohol, room temperature reaction 10 hours, and with absolute ethyl alcohol eccentric cleaning three times, drying to obtain silica is received
Meter Wei Qiu；
2) carbon point base silicon dioxide composite material is prepared：By step 1) in the silicon dioxide nanosphere that obtains be placed in 400
Calcined 2 hours at DEG C, be for three times to obtain carbon point base silicon dioxide composite material with ethanol eccentric cleaning after being cooled to room temperature.
Further, the deionized water, ammoniacal liquor, 3- aminopropyls-trimethoxy silane, tetraethyl orthosilicate and anhydrous second
The mass ratio of alcohol is 6~7：2：0.1~1.2：2~8：50.
Application of a kind of carbon point base silicon dioxide composite material in lithium battery is prepared, it is characterised in that including following step
Suddenly：
1) conductive black, crosslinking agent PVDF, carbon point base silicon dioxide composite material is first taken to be added in nmp solvent and mix
Uniformly, mixed solution is obtained；
2) mixed solution is evenly coated in above aluminium foil again and is placed in being dried in vacuum drying chamber, obtain lithium battery electrode plate
First finished product；
3) strip and then by aluminium foil is cut into, lithium battery electrode plate finished product is obtained.
Wherein crosslinking agent PVDF is Kynoar, and NMP is the pyrrolidones of 1- methyl -2, also known as 1-METHYLPYRROLIDONE.
In above-mentioned application, it is preferable that the conductive black, crosslinking agent PVDF, carbon point base silicon dioxide composite material
Mass ratio is 2：1：7.
Further, step 1) in each component hybrid mode be ultrasonic wave mixing, the time be 2 hours.
Further, step 2) in drying temperature be 100 DEG C, the time be 12 hours.
Compared with prior art, the present invention has the following advantages：
1. carbon point base silicon dioxide composite material of the present invention reduces silica reunion, corrosion in the battery
Deng side reaction so that lithium battery stability prepared by the material is high, and after being recycled for multiple times, special capacity fade is smaller；
2. carbon point base silicon dioxide composite material of the present invention with traditional electrode material compared to can be in ultraviolet light
Excite the fluorescence of lower aobvious different colours；
3. preparation method step of the present invention is succinct, easily operation, short preparation period, gained high yield rate.
【Brief description of the drawings】
Fig. 1 is the preparation process schematic diagram of carbon point base silicon dioxide composite material of the present invention；
Fig. 2A and 2B are the transmission electron microscope pictures of carbon point base silicon dioxide composite material of the present invention, and wherein 2A is low
Transmission electron microscope picture under resolution ratio, 2B is the transmission electron microscope picture under high-resolution；
Fig. 3 is the fluorescence spectrum picture of carbon point base silicon dioxide composite material of the present invention；
Fig. 4 A, 4B and 4C are the charge and discharge electrographs that carbon point base silicon dioxide composite material of the present invention is made lithium battery,
Wherein 4A is the charge and discharge electrograph of embodiment 2, and 4B is the charge and discharge electrograph of embodiment 5, and 4C is the charge and discharge electrograph of embodiment 8.
【Specific embodiment】
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as additionally, technical characteristic involved in invention described below each implementation method
Not constituting conflict each other can just be mutually combined.
Carbon point base silicon dioxide composite material of the present invention includes nano-scale carbon point and silicon dioxide nanosphere, described
Silicon dioxide nanosphere constitutes a network structure, and the nano-scale carbon point is interspersed in the middle of network, and the silica is received
The average grain diameter of meter Wei Qiu is between 10nm to 20nm, and the average grain diameter of the nano-scale carbon point is described between 2nm to 6nm
Composite can launch the fluorescence of blue, green or red under ultraviolet light.The carbon point base silicon dioxide composite material
Specific surface area reaches 389.18m2/ g, specific capacity is between 250mAh/g to 410mAh/g.
The preparation method of carbon point base silicon dioxide composite material of the present invention, as shown in figure 1, it includes following step
Suddenly：
1) silicon dioxide nanosphere is prepared：By a certain amount of deionized water, ammoniacal liquor, silane coupler 3- aminopropyls-three
Methoxy silane, tetraethyl orthosilicate bonus point are clipped in 50mL absolute ethyl alcohols, room temperature reaction 10 hours, then with absolute ethyl alcohol from
The heart is cleaned three times, and 50 DEG C of dryings obtain silicon dioxide nanosphere；
2) carbon point base silicon dioxide composite material is prepared：By step 1) in the silicon dioxide nanosphere that obtains be placed in 400
Calcined 2 hours at DEG C, be for three times to obtain carbon point base silicon dioxide composite material with ethanol eccentric cleaning after being cooled to room temperature.
The mass ratio of the deionized water, ammoniacal liquor, silane coupler, tetraethyl orthosilicate and absolute ethyl alcohol is 6~7：2：
0.1~1.2：2~8：50.
Application of the carbon point base silicon dioxide composite material of the present invention in lithium battery is prepared, comprises the following steps：
1) a certain amount of conductive black, crosslinking agent PVDF, carbon point base silicon dioxide composite material are first taken and is added to 0.5mL's
It is in nmp solvent and in fact dispersed with ultrasonic mixing 2 hours, obtain mixed solution；
2) mixed solution is evenly coated in above aluminium foil again and is placed in vacuum drying chamber 100 DEG C of dryings 12 hours, obtained
The first finished product of lithium battery electrode plate；
3) strip and then by aluminium foil is cut into, lithium battery electrode plate finished product is obtained.
Wherein, conductive black, crosslinking agent PVDF, the addition ratio of carbon point base silicon dioxide composite material are 2：1：7.
The electrode slice that will be prepared is positioned over above egative film in vacuum glove box, and electrolyte is added dropwise is brought into close contact barrier film
On electrode slice, then lithium piece is positioned over diaphragms, nickel foam is then placed in lithium piece upper strata and electrode slice and lithium piece exist
Pressed in battery tight.
The conductive black, crosslinking agent PVDF, the mass ratio of carbon point base silicon dioxide composite material are 1~2：1~2：6~
8。
Carbon point base silicon dioxide composite material of the present invention is in preparation process because of silane coupler 3- aminopropyls-three
The consumption of methoxy silane is different, and its missile fluorescence color under ultraviolet light is also different, in addition silica nanometer
The average grain diameter of microballoon is also different because of the addition of its presoma tetraethyl orthosilicate.
Elaborated with reference to embodiment：(such as table 1)
Table 1：Unit/mL
Embodiment 1
Prepare the blue-fluorescence carbon point base silicon dioxide composite material of the average grain diameter in 10nm of silicon dioxide nanosphere
1) silicon dioxide nanosphere is prepared：By 6ml deionized waters, 2ml ammoniacal liquor, 0.1ml silane coupler 3- ammonia third
Base-trimethoxy silane, 2ml tetraethyl orthosilicate bonus point are clipped in 50ml absolute ethyl alcohols, room temperature reaction 10 hours, then with nothing
Water-ethanol eccentric cleaning three times, 50 DEG C of dryings, obtains silicon dioxide nanosphere；
2) carbon point base silicon dioxide composite material is prepared：By step 1) in the silicon dioxide nanosphere that obtains be placed in 400
Calcined 2 hours at DEG C, after being cooled to room temperature, with ethanol eccentric cleaning three times, carbon point base silicon dioxide composite material is obtained.The carbon
Point base silicon dioxide composite material can launch faint blue-fluorescence under ultraviolet light, under high resolution electron microscope (HREM)
The average grain diameter of its silicon dioxide nanosphere is measured for 10nm, the average grain diameter of nano-scale carbon point is in 2nm.
Embodiment 2
Prepare the blue-fluorescence carbon point base silicon dioxide composite material of the average grain diameter in 15nm of silicon dioxide nanosphere
1) silicon dioxide nanosphere is prepared：By 6ml deionized waters, 2ml ammoniacal liquor, 0.17ml silane coupler 3- ammonia third
Base-trimethoxy silane, 5ml tetraethyl orthosilicate bonus point are clipped in 50ml absolute ethyl alcohols, room temperature reaction 10 hours, then with nothing
Water-ethanol eccentric cleaning three times, 50 DEG C of dryings, obtains silicon dioxide nanosphere；
2) carbon point base silicon dioxide composite material is prepared：By step 1) in the silicon dioxide nanosphere that obtains be placed in 400
Calcined 2 hours at DEG C, after being cooled to room temperature, with ethanol eccentric cleaning three times, carbon point base silicon dioxide composite material is obtained.The carbon
Point base silicon dioxide composite material can launch stronger blue-fluorescence under ultraviolet light, under high resolution electron microscope (HREM)
The average grain diameter of its silicon dioxide nanosphere is measured for 15nm, the average grain diameter of nano-scale carbon point is in 3nm.
Embodiment 3
Prepare the blue-fluorescence carbon point base silicon dioxide composite material of the average grain diameter in 20nm of silicon dioxide nanosphere
1) silicon dioxide nanosphere is prepared：By 6ml deionized waters, 2ml ammoniacal liquor, 0.28ml silane coupler 3- ammonia third
Base-trimethoxy silane, 8ml tetraethyl orthosilicate bonus point are clipped in 50ml absolute ethyl alcohols, room temperature reaction 10 hours, then with nothing
Water-ethanol eccentric cleaning three times, 50 DEG C of dryings, obtains silicon dioxide nanosphere；
2) carbon point base silicon dioxide composite material is prepared：By step 1) in the silicon dioxide nanosphere that obtains be placed in 400
Calcined 2 hours at DEG C, after being cooled to room temperature, with ethanol eccentric cleaning three times, carbon point base silicon dioxide composite material is obtained.The carbon
Point base silicon dioxide composite material can launch weaker blue-fluorescence under ultraviolet light, under high resolution electron microscope (HREM)
The average grain diameter of its silicon dioxide nanosphere is measured for 20nm, the average grain diameter of nano-scale carbon point is in 3nm.
Embodiment 4
Prepare the green fluorescent carbon dots base silicon dioxide composite material of the average grain diameter in 10nm of silicon dioxide nanosphere
1) silicon dioxide nanosphere is prepared：By 6ml deionized waters, 2ml ammoniacal liquor, 0.4ml silane coupler 3- aminopropyls-
Trimethoxy silane, 2ml tetraethyl orthosilicate bonus point are clipped in 50ml absolute ethyl alcohols, room temperature reaction 10 hours, then with anhydrous
Ethanol eccentric cleaning three times, 50 DEG C of dryings, obtains silicon dioxide nanosphere；
2) carbon point base silicon dioxide composite material is prepared：By step 1) in the silicon dioxide nanosphere that obtains be placed in 400
Calcined 2 hours at DEG C, after being cooled to room temperature, with ethanol eccentric cleaning three times, carbon point base silicon dioxide composite material is obtained.Should
Carbon point base silicon dioxide composite material can launch faint green fluorescence under ultraviolet light, in high resolution electron microscope (HREM)
Under measure the average grain diameter of its silicon dioxide nanosphere for 10nm, the average grain diameter of nano-scale carbon point is in 4nm.
Embodiment 5
Prepare the green fluorescent carbon dots base silicon dioxide composite material of the average grain diameter in 15nm of silicon dioxide nanosphere
1) silicon dioxide nanosphere is prepared：By 7ml deionized waters, 2ml ammoniacal liquor, 0.65ml silane coupler 3- ammonia third
Base-trimethoxy silane, 5ml tetraethyl orthosilicate bonus point are clipped in 50ml absolute ethyl alcohols, room temperature reaction 10 hours, then with nothing
Water-ethanol eccentric cleaning three times, 50 DEG C of dryings, obtains silicon dioxide nanosphere；
2) carbon point base silicon dioxide composite material is prepared：By step 1) in the silicon dioxide nanosphere that obtains be placed in 400
Calcined 2 hours at DEG C, after being cooled to room temperature, with ethanol eccentric cleaning three times, carbon point base silicon dioxide composite material is obtained.The carbon
Point base silicon dioxide composite material can launch stronger green fluorescence under ultraviolet light, under high resolution electron microscope (HREM)
The average grain diameter of its silicon dioxide nanosphere is measured for 15nm, the average grain diameter of nano-scale carbon point is in 4nm.
Embodiment 6
Prepare the green fluorescent carbon dots base silicon dioxide composite material of the average grain diameter in 20nm of silicon dioxide nanosphere
1) silicon dioxide nanosphere is prepared：By 7ml deionized waters, 2ml ammoniacal liquor, 0.8ml silane coupler 3- aminopropyls-
Trimethoxy silane, 8ml tetraethyl orthosilicate bonus point are clipped in 50ml absolute ethyl alcohols, room temperature reaction 10 hours, then with anhydrous
Ethanol eccentric cleaning three times, 50 DEG C of dryings, obtains silicon dioxide nanosphere；
2) carbon point base silicon dioxide composite material is prepared：By step 1) in the silicon dioxide nanosphere that obtains be placed in 400
Calcined 2 hours at DEG C, after being cooled to room temperature, with ethanol eccentric cleaning three times, carbon point base silicon dioxide composite material is obtained.The carbon
Point base silicon dioxide composite material can launch weaker green fluorescence under ultraviolet light, under high resolution electron microscope (HREM)
The average grain diameter of its silicon dioxide nanosphere is measured for 20nm, the average grain diameter of nano-scale carbon point is in 5nm.
Embodiment 7
Prepare the red fluorescence carbon point base silicon dioxide composite material of the average grain diameter in 10nm of silicon dioxide nanosphere
1) silicon dioxide nanosphere is prepared：By 7ml deionized waters, 2ml ammoniacal liquor, 0.9ml silane coupler 3- aminopropyls-
Trimethoxy silane, 2ml tetraethyl orthosilicate bonus point are clipped in 50ml absolute ethyl alcohols, room temperature reaction 10 hours, then with anhydrous
Ethanol eccentric cleaning three times, 50 DEG C of dryings, obtains silicon dioxide nanosphere；
2) carbon point base silicon dioxide composite material is prepared：By step 1) in the silicon dioxide nanosphere that obtains be placed in 400
Calcined 2 hours at DEG C, after being cooled to room temperature, with ethanol eccentric cleaning three times, carbon point base silicon dioxide composite material is obtained.The carbon
Point base silicon dioxide composite material can launch faint red fluorescence under ultraviolet light, under high resolution electron microscope (HREM)
The average grain diameter of its silicon dioxide nanosphere is measured for 10nm, the average grain diameter of nano-scale carbon point is in 5nm.
Embodiment 8
Prepare the red fluorescence carbon point base silicon dioxide composite material of the average grain diameter in 15nm of silicon dioxide nanosphere
1) silicon dioxide nanosphere is prepared：By 7ml deionized waters, 2ml ammoniacal liquor, 1.09ml silane coupler 3- ammonia third
Base-trimethoxy silane, 5ml tetraethyl orthosilicate bonus point are clipped in 50ml absolute ethyl alcohols, room temperature reaction 10 hours, then with nothing
Water-ethanol eccentric cleaning three times, 50 DEG C of dryings, obtains silicon dioxide nanosphere；
2) carbon point base silicon dioxide composite material is prepared：By step 1) in the silicon dioxide nanosphere that obtains be placed in 400
Calcined 2 hours at DEG C, after being cooled to room temperature, with ethanol eccentric cleaning three times, carbon point base silicon dioxide composite material is obtained.The carbon
Point base silicon dioxide composite material can launch stronger red fluorescence under ultraviolet light, under high resolution electron microscope (HREM)
The average grain diameter of its silicon dioxide nanosphere is measured for 15nm, the average grain diameter of nano-scale carbon point is in 6nm.
Embodiment 9
Prepare the red fluorescence carbon point base silicon dioxide composite material of the average grain diameter in 20nm of silicon dioxide nanosphere
1) silicon dioxide nanosphere is prepared：By 7ml deionized waters, 2ml ammoniacal liquor, 1.2ml silane coupler 3- aminopropyls-
Trimethoxy silane, 8ml tetraethyl orthosilicate bonus point are clipped in 50ml absolute ethyl alcohols, room temperature reaction 10 hours, then with anhydrous
Ethanol eccentric cleaning three times, 50 DEG C of dryings, obtains silicon dioxide nanosphere；
2) carbon point base silicon dioxide composite material is prepared：By step 1) in the silicon dioxide nanosphere that obtains be placed in 400
Calcined 2 hours at DEG C, after being cooled to room temperature, with ethanol eccentric cleaning three times, carbon point base silicon dioxide composite material is obtained.The carbon
Point base silicon dioxide composite material can launch weaker red fluorescence under ultraviolet light, in high resolution electron microscope (HREM)
Under measure the average grain diameter of its silicon dioxide nanosphere for 20nm, the average grain diameter of nano-scale carbon point is in 6nm.
As shown in Fig. 2A, 2B and 3, Fig. 2A, 2B are carbon point base silicon dioxide composite material obtained in above-described embodiment 2 in height
With the transmission electron microscope picture (wherein Fig. 2A is low resolution, and Fig. 2 B are high-resolution) under low resolution, Fig. 3 is above-described embodiment
1,2,3 respectively obtained carbon point base silicon dioxide composite material blue spectrum picture, wherein curve a are sent under ultraviolet light
Embodiment 1 is represented, curve b represents embodiment 3, and curve c represents embodiment 2.
Carbon point base silicon dioxide composite material of the present invention mainly for the preparation of lithium battery electrode slice, by above-mentioned reality
Example 2 is applied, obtained carbon point base silicon dioxide composite material is respectively intended to prepare the electrode slice of lithium battery in 5,8, is finally made lithium
Battery simultaneously detects its charge-discharge performance.
As shown in Fig. 4 A, 4B and 4C, wherein Fig. 4 A are with carbon point base silicon dioxide composite material obtained in above-described embodiment 2
The charge and discharge electrograph of the lithium battery of preparation, its inner curve a is represented and is filled (put) electricity first, and curve b represents the 10th time and fills (put) electricity, curve
C represents the 30th time and fills (put) electricity, and curve d represents the 50th time and fills (put) electricity, and curve e represents the 70th time and fills (put) electricity, and curve f is represented
Fill (put) electricity 100th time；Fig. 4 B are the lithium battery prepared with carbon point base silicon dioxide composite material obtained in above-described embodiment 5
Charge and discharge electrograph；Fig. 4 C are the discharge and recharge of the lithium battery prepared with carbon point base silicon dioxide composite material obtained in above-described embodiment 8
Figure.
Be can be seen that by Fig. 4 A, 4B and 4C, electrode slice is prepared into carbon point base silicon dioxide composite material of the present invention
And be applied in lithium battery, obtained lithium battery good stability, by after repeatedly circulation, the decay of specific capacity is smaller.
Claims (10)
1. a kind of carbon point base silicon dioxide composite material, it is characterised in that：Include nano-scale carbon point and silica nanometer is micro-
Ball, wherein silicon dioxide nanosphere constitute a network structure, in a network between be interspersed with carbon point, the silica nanometer
Between 10nm to 20nm, the average grain diameter of carbon point is between 2nm to 6nm for the average grain diameter of microballoon.
2. carbon point base silicon dioxide composite material according to claim 1, it is characterised in that the silica nanometer is micro-
Ball is made under absolute ethyl alcohol environment by deionized water, ammoniacal liquor, 3- aminopropyls-trimethoxy silane and tetraethyl orthosilicate
.
3. carbon point base silicon dioxide composite material according to claim 2, it is characterised in that the silica nanometer is micro-
Carbon point base silicon dioxide composite material can be obtained after ball warp high-temperature calcination.
4. carbon point base silicon dioxide composite material according to claim 3, it is characterised in that the high-temperature calcination time is 2 small
When, temperature is 400 DEG C.
5. carbon point base silicon dioxide composite material according to claim 2, it is characterised in that deionized water, ammoniacal liquor, 3- ammonia
The addition ratio of propyl-trimethoxysilane, tetraethyl orthosilicate and absolute ethyl alcohol is 6~7：2：0.1~1.2：2~8：50.
6. carbon point base silicon dioxide composite material according to claim 5, it is characterised in that hybrid reaction is in room temperature environment
Under carry out, the reaction time be 10 hours.
7. a kind of application of the carbon point base silicon dioxide composite material described in claim 1 in lithium battery is prepared, its feature exists
In comprising the following steps：
1) conductive black, crosslinking agent PVDF, carbon point base silicon dioxide composite material is first taken to be added in nmp solvent and mix
It is even, obtain mixed solution；
2) mixed solution is evenly coated in above aluminium foil again and is placed in being dried in vacuum drying chamber, obtain lithium battery electrode plate just into
Product；
3) strip and then by aluminium foil is cut into, lithium battery electrode plate finished product is obtained.
8. application of the carbon point base silicon dioxide composite material according to claim 7 in lithium battery is prepared, its feature exists
In conductive black, crosslinking agent PVDF, carbon point base silicon dioxide composite material addition ratio be 2：1：7.
9. application of the carbon point base silicon dioxide composite material according to claim 7 in lithium battery is prepared, its feature exists
In step 1) in each component hybrid mode be ultrasonic wave mixing, the time be 2 hours.
10. application of the carbon point base silicon dioxide composite material according to claim 7 in lithium battery is prepared, its feature exists
In step 2) in drying temperature be 100 DEG C, the time be 12 hours.
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| CN110611089A (en) * | 2019-08-30 | 2019-12-24 | 广东新凌嘉新能源股份有限公司 | Improved silicon-based negative electrode material of lithium ion battery |
| CN111603570A (en) * | 2020-07-06 | 2020-09-01 | 南京工业大学 | Carbon-point-modified hollow copolymer nano particle, preparation method and application thereof, drug delivery system and application thereof |
| CN111603570B (en) * | 2020-07-06 | 2021-04-30 | 南京工业大学 | Carbon-point-modified hollow copolymer nano particle, preparation method and application thereof, drug delivery system and application thereof |
| CN113003701A (en) * | 2021-02-08 | 2021-06-22 | 哈尔滨工业大学 | Lead-zinc mine tailing pond wastewater deep purification device with electric coupling biological filter |
| CN113462378A (en) * | 2021-06-29 | 2021-10-01 | 山西大同大学 | Phosphorescent silica/carbon nano composite and preparation method and application thereof |
| CN113462378B (en) * | 2021-06-29 | 2024-04-09 | 山西大同大学 | Phosphorescent silica/carbon nano-composite and preparation method and application thereof |
| CN114570350A (en) * | 2022-03-07 | 2022-06-03 | 华北电力大学 | Carbon dot/silicon dioxide composite material, preparation method and application thereof |
| CN114570350B (en) * | 2022-03-07 | 2022-09-06 | 华北电力大学 | Carbon dot/silicon dioxide composite material, preparation method and application thereof |
| CN115975637A (en) * | 2023-01-06 | 2023-04-18 | 浙江大学 | High-temperature stable carbon nanodot @ silicon dioxide composite material and preparation method and application thereof |
| CN115975637B (en) * | 2023-01-06 | 2024-04-09 | 浙江大学 | Carbon nano dot@silicon dioxide composite material stable at high temperature and preparation method and application thereof |
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