CN104638254A - Self-assembly method for laminar SiO2@C/G lithium ion battery cathode material - Google Patents
Self-assembly method for laminar SiO2@C/G lithium ion battery cathode material Download PDFInfo
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- CN104638254A CN104638254A CN201510037907.XA CN201510037907A CN104638254A CN 104638254 A CN104638254 A CN 104638254A CN 201510037907 A CN201510037907 A CN 201510037907A CN 104638254 A CN104638254 A CN 104638254A
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- lithium ion
- sio2
- ion battery
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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 self-assembly method for a laminar SiO2@C/G lithium ion battery cathode material, belongs to the technology category of new material preparation and belongs to the technical field of intersection of a carbon material and a new energy source material. The self-assembly method has the characteristic that silica sol, graphene and graphite lamellae are self-assembled into the laminar SiO2@C/G lithium ion battery cathode material in the processes of ultrasound treatment, hydro-thermal treatment and subsequent heat treatment. Graphene has a good two-dimensional lamellar structure and excellent conductivity, a carbon network which is distributed between the graphene lamellae and has continuously inlaid SiO2 nano-particles is conductive and can ensure that SiO2 is closely connected with graphene, and a formed SiO2@C/G three-dimensional conductive network significantly solves the problems that SiO2 is poor in conductivity and is easily expanded during charging and discharging. SiO2@C/G has a series of advantages of wide-quantity and low-cost raw materials, simple preparation method, good shape, stable structure, high discharge capacity, strong conductivity, good cycling performance and the like, and is a lithium ion secondary battery cathode material with wide application prospects.
Description
Technical field
The invention belongs to carbon material and lithium ion battery material technical field, relate to a kind of high performance lithium ionic cell cathode material and self-assembling method thereof.
Background technology
Along with the fast development of World Economics and continuing to increase of demand for energy, a large amount of consumption of fossil fuel and the problem of environmental pollution brought become current mankind global problem in the urgent need to address, seek high-performance, low cost, sustainable and eco-friendly new forms of energy system become current urgent problem.Lithium ion battery is with its high theoretical specific capacity, the high open advantage such as voltage and memory-less effect, with storage battery phase specific volume is less, cycle life is longer, security performance is better, be thus widely used in mancarried electronic aid, electric automobile and other sustainable energy storage devices.But the negative pole that the lithium ion battery in current business uses is graphite material, lower (the 372mAh g of its theoretical capacity
-1), be difficult to meet the growing and required high power capacity requirement of battery.
Develop of fine quality, safety, inexpensive, eco-friendly new type lithium ion battery is most important to its large area industrial applications.How to realize high power capacity, lithium ion battery that high-power and long-life has concurrently, depend on the structural design of its each core component.The raising of electrode material performance is most important for the raising of lithium ion battery overall performance, and the quality of its performance directly has influence on the performance of lithium ion battery.
SiO
2be the most important compound of silicon, be widespread in nature have crystallization and amorphous two kinds, be referred to as silica, the main component of normal sands and SiO
2.Due to its stable in properties, cheap, ratio capacitance is high, is a kind of potential high-quality ion cathode material lithium.But, SiO
2during as lithium ion battery negative material, in charge and discharge process, there is the problem of Volumetric expansion and poorly conductive, limit SiO to a great extent
2capacity boost and cyclical stability.
Graphene is paid close attention to widely because having superior conductance, larger specific area, high chemical stability and good pliability.As two-dimentional lamellar structure, can naturally curl into many hollow structures, as by Graphene by stable connected mode and SiO
2nano-particles reinforcement, is expected to improve the conductivity of electrode material, improves the problem because of the electrode material volumetric expansion of Lithium-ion embeding-deviate to cause in charge and discharge process, thus promotes the overall performance of battery.
Summary of the invention
1. a stratiform SiO
2@C/G lithium ion battery negative material self-assembling method, by SiO
2the direct ultrasonic Homogeneous phase mixing of colloidal sol, sucrose, graphite oxide, obtains the SiO of layered self-packaging through hydro-thermal and subsequent high temperature process
2@C/G compound.It is characterized in that its step prepared and process conditions as follows:
(1) SiO is taken according to a certain percentage
2colloidal sol and sucrose, be dissolved in deionized water, stirs, ultrasonicly make the transparent micro-blueness of solution;
(2) take a certain amount of graphite oxide, add in the micro-blue solution in step (1), ultrasonic disperse certain hour, obtains mixed solution;
(3) mixed liquor in (2) is placed in water heating kettle, 10 ~ 15h is reacted at 180 ~ 200 DEG C, naturally cool to room temperature, with product is dry after deionized water, absolute ethyl alcohol filtering and washing, dried product is placed in high temperature furnace, in nitrogen atmosphere, be warming up to uniform temperature and keep certain hour at such a temperature, obtaining the SiO of layered self-packaging
2@C/G compound.
2. stratiform SiO according to claim 1
2@C/G lithium ion battery negative material self-assembling method, the SiO in step (1)
2sol size is 14-18nm, is undefined structure.SiO
2the mass ratio of colloidal sol and sucrose is 0.15 ~ 0.90.
3. stratiform SiO according to claim 1
2@C/G lithium ion battery negative material self-assembling method, the graphite oxide described in step (2) adopts the Hummers method improved to obtain, and the mass ratio of graphite oxide and sucrose is 0.01 ~ 0.06, and ultrasonic time is 2 ~ 4h.
4. stratiform SiO according to claim 1
2@C/G lithium ion battery negative material self-assembling method, the final temperature described in step (3) is 600 ~ 800 DEG C, and insulation 2 ~ 3h, heating rate is 5 ~ 10 DEG C of min
-1.
Accompanying drawing explanation
Fig. 1 is the infrared spectrogram of example 1 in the present invention, comparative example 1, comparative example 2 gained sample and graphene oxide (GO).
Fig. 2 is the SiO in the present invention in example 1
2@C/G SEM schemes (a), and scale is 3 μm; TEM schemes (b).C/G SEM in comparative example 1 schemes (c), and scale is 3 μm; SiO in comparative example 2
2sEM figure (d), scale is 5 μm.
Fig. 3 is the cycle performance curve of example 1 in the present invention, example 2, example 3, comparative example 1, comparative example 2 gained sample.
Embodiment
Embodiment 1:
Take 7.5g silica hydrosol, 20g sucrose, measure 291ml deionized water and add, stir, ultrasonic disperse, makes the transparent micro-indigo plant of its above-mentioned solution.Take 0.3g graphite oxide (GO), ultrasonic disperse is in above-mentioned solution.Above-mentioned solution is placed in water heating kettle, at 190 DEG C, keeps 2h, naturally cool to room temperature, by product deionized water in still and ethanol washes clean, dry at 60 DEG C.Dried product is placed in tube furnace, under nitrogen atmosphere, with 5 DEG C of min
-1heating rate be warming up to 600 DEG C, insulation 2h, obtain 600-SiO
2@C/G compound.
Embodiment 2:
Take 7.5g silica hydrosol, 20g sucrose, measure 291ml deionized water and add, stir, ultrasonic disperse, makes the transparent micro-indigo plant of its above-mentioned solution.Take 0.3g graphite oxide (GO), ultrasonic disperse is in above-mentioned solution.Above-mentioned solution is placed in water heating kettle, at 190 DEG C, keeps 2h, naturally cool to room temperature, by product deionized water in still and ethanol washes clean, dry at 60 DEG C.Dried product is placed in tube furnace, under nitrogen atmosphere, with 5 DEG C of min
-1heating rate be warming up to 700 DEG C, insulation 2h, obtain 700-SiO
2@C/G compound.
Embodiment 3:
Take 7.5g silica hydrosol, 20g sucrose, measure 291ml deionized water and add, stir, ultrasonic disperse, makes the transparent micro-indigo plant of its above-mentioned solution.Take 0.3g graphite oxide (GO), ultrasonic disperse is in above-mentioned solution.Above-mentioned solution is placed in water heating kettle, at 190 DEG C, keeps 2h, naturally cool to room temperature, by product deionized water in still and ethanol washes clean, dry at 60 DEG C.Dried product is placed in tube furnace, under nitrogen atmosphere, with 5 DEG C of min
-1heating rate be warming up to 800 DEG C, insulation 2h, obtain 800-SiO
2@C/G compound.
Comparative example 1:
Take 20g sucrose, measure 300ml deionized water and add, stir, ultrasonic disperse, makes its solution transparent.Take 0.3g graphite oxide, ultrasonic disperse is in above-mentioned solution.Above-mentioned solution is placed in water heating kettle, at 190 DEG C, keeps 2h, naturally cool to room temperature, by product deionized water in still and ethanol washes clean, dry at 60 DEG C.Dried product is placed in tube furnace, under nitrogen atmosphere, with 5 DEG C of min
-1heating rate be warming up to 700 DEG C, insulation 2h, obtain C/G compound.
Comparative example 2:
Take 7.5g silica hydrosol, 20g sucrose, measure 291ml deionized water and add, stir, ultrasonic disperse, makes the transparent micro-indigo plant of its above-mentioned solution.Take 0.3g graphite oxide, ultrasonic disperse is in above-mentioned solution.Above-mentioned solution is placed in water heating kettle, at 190 DEG C, keeps 2h, naturally cool to room temperature, by product deionized water in still and ethanol washes clean, dry at 60 DEG C.Dried product is placed in Muffle furnace, under air atmosphere, with 5 DEG C of min
-1heating rate be warming up to 700 DEG C, insulation 2h, obtain pure SiO
2.
Claims (4)
1. a stratiform SiO
2@C/G lithium ion battery negative material self-assembling method, by SiO
2the direct ultrasonic Homogeneous phase mixing of colloidal sol, sucrose, graphite oxide, obtains the SiO of layered self-packaging through hydro-thermal and subsequent high temperature process
2@C/G compound.It is characterized in that its step prepared and process conditions as follows:
(1) SiO is taken according to a certain percentage
2colloidal sol and sucrose, be dissolved in deionized water, stirs, ultrasonicly make the transparent micro-blueness of solution;
(2) take a certain amount of graphite oxide, add in the micro-blue solution in step (1), ultrasonic disperse certain hour, obtains mixed solution;
(3) mixed liquor in (2) is placed in water heating kettle, 10 ~ 15h is reacted at 180 ~ 200 DEG C, naturally cool to room temperature, with product is dry after deionized water, absolute ethyl alcohol filtering and washing, dried product is placed in high temperature furnace, in nitrogen atmosphere, be warming up to uniform temperature and keep certain hour at such a temperature, obtaining the SiO of layered self-packaging
2@C/G compound.
2. stratiform SiO according to claim 1
2@C/G lithium ion battery negative material self-assembling method, the SiO in step (1)
2sol size is 14-18nm, is undefined structure.SiO
2the mass ratio of colloidal sol and sucrose is 0.15 ~ 0.90.
3. stratiform SiO according to claim 1
2@C/G lithium ion battery negative material self-assembling method, the graphite oxide described in step (2) adopts the Hummers method improved to obtain, and the mass ratio of graphite oxide and sucrose is 0.01 ~ 0.06, and ultrasonic time is 2 ~ 4h.
4. stratiform SiO according to claim 1
2@C/G lithium ion battery negative material self-assembling method, the final temperature described in step (3) is 600 ~ 800 DEG C, and insulation 2 ~ 3h, heating rate is 5 ~ 10 DEG C of min
-1.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104941584A (en) * | 2015-07-06 | 2015-09-30 | 河北工业大学 | SiO2/C composite material for adsorbing heavy metal ions in water body and application thereof |
| CN110034291A (en) * | 2019-04-26 | 2019-07-19 | 蜂巢能源科技有限公司 | Silicon-carbon cathode material and preparation method thereof, battery |
| CN112777591A (en) * | 2021-01-15 | 2021-05-11 | 无锡东恒新能源科技有限公司 | Preparation method of lithium battery negative electrode material |
-
2015
- 2015-01-26 CN CN201510037907.XA patent/CN104638254A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104941584A (en) * | 2015-07-06 | 2015-09-30 | 河北工业大学 | SiO2/C composite material for adsorbing heavy metal ions in water body and application thereof |
| CN110034291A (en) * | 2019-04-26 | 2019-07-19 | 蜂巢能源科技有限公司 | Silicon-carbon cathode material and preparation method thereof, battery |
| CN112777591A (en) * | 2021-01-15 | 2021-05-11 | 无锡东恒新能源科技有限公司 | Preparation method of lithium battery negative electrode material |
| CN112777591B (en) * | 2021-01-15 | 2022-02-22 | 无锡东恒新能源科技有限公司 | Preparation method of lithium battery negative electrode material |
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