CN103854880A - Graphene electrode sheet and preparation method and application thereof - Google Patents
Graphene electrode sheet and preparation method and application thereof Download PDFInfo
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- CN103854880A CN103854880A CN201210504643.0A CN201210504643A CN103854880A CN 103854880 A CN103854880 A CN 103854880A CN 201210504643 A CN201210504643 A CN 201210504643A CN 103854880 A CN103854880 A CN 103854880A
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Abstract
The invention belongs to the field of electrochemical materials, and discloses a graphene electrode sheet and a preparation method and an application thereof. The method comprises the following steps: graphite oxide is added into water, and suspension liquid is formed after ultrasonic treatment; the suspension liquid is spin-coated on a current collector and dried so that a precursor electrode sheet is obtained; and the precursor electrode sheet is arranged under a laser emitter, and the precursor electrode sheet is repeatedly irradiated by infrared light so that the graphene electrode sheet is obtained. According to the prepared graphene electrode sheet, after the graphene electrode sheet is used as a positive electrode of a lithium-ion capacitor, energy density can be 113-136wh/kg which surpasses energy density of 60-80wh/kg of a nickel-metal hydride battery so that energy density of 113-136wh/kg of a lithium-ion battery is reached.
Description
Technical field
The present invention relates to electrochemical material field, relate in particular to a kind of Graphene electrodes sheet and its preparation method and application.
Background technology
The nineties in 20th century, the exploitation to electric automobile and the demand to pulse power supply, stimulated the research of people to electrochemical capacitor.The specific energy of electrochemical capacitor is still lower at present, and the specific power of battery is lower, and people are just attempting to address this problem from two aspects: use combined by battery and ultracapacitor by (1), while normally work, provide required power by battery; When starting or needing heavy-current discharge, provided by capacitor, can improve on the one hand the bad shortcoming of cryogenic property of battery; Can solve the application scenario of the pulse current higher for power requirement, as GSM, GPRS etc.Capacitor and battery are combined use and can be extended the life of a cell, but this will increase the annex of battery, disagree with the developing direction such as short and small frivolous of current energy device.(2) utilize the principle of electrochemical capacitor and battery, exploitation mixed capacitor is as new energy storage unit.
Nineteen ninety Giner company has released the so-called fake capacitance device that metal oxide containing precious metals is electrode material or has claimed pseudo-capacitance device (Pseudo-capacitor).For further improving the specific energy of electrochemical capacitor, nineteen ninety-five, D.A.Evans etc. have proposed ideal polarized electrode and faraday's reaction electrode to combine the concept (Electrochemical Hybrid Capacitor, EHC or be called Hybrid capacitor) that forms mixed capacitor.1997, ESMA company disclosed the concept of NiOOH/AC mixed capacitor, had disclosed the new technology of accumulator material and electrochemical capacitor combination of materials.Calendar year 2001, G.G.Amatucci has reported the Li of organic system lithium ion battery material and active carbon combination
4ti
5o
12/ AC electrochemical mixed capacitor is another milestone of electrochemical mixed capacitor development.
The hybrid super capacitor of research mainly adopts the activated carbon of high-specific surface area as positive electrode at present, graphite or Li
4ti
5o
12as negative pole, form electric double layer anodal with the surface of electrolyte, the capacity of positive electrode has determined the capacity of whole system, because the capacity of anodal electric double layer is less, the capacity that has limited the whole system of ultracapacitor improves, and the positive pole of therefore preparing high power capacity is the key that the energy density of lithium-ion capacitor improves.
Summary of the invention
The Graphene electrodes sheet that provides a kind of energy density high is provided problem to be solved by this invention.
Technical scheme of the present invention is as follows:
A preparation method for Graphene electrodes sheet, comprises the steps:
Graphite oxide is added to the water, ultrasonic 1 ~ 5h, the suspension that formation concentration is 0.1 ~ 10mg/ml;
Suspension is spin-coated on collector, dry, obtain presoma electrode slice;
Presoma electrode slice is placed under generating laser, and employing wavelength is that the infrared light under 760 ~ 1200nm irradiates presoma electrode slice repeatedly, obtains Graphene electrodes sheet.
The preparation method of described Graphene electrodes sheet, wherein, described collector is aluminium foil, nickel screen, stainless steel substrates, titanium foil or goldleaf.
The preparation method of described Graphene electrodes sheet, wherein, in the time that suspension is spin-coated on collector, need to spin coating repeatedly after drying and volatilizing solvent, dry, and the thickness of controlling presoma electrode slice is 20 ~ 200um.
The Graphene electrodes sheet that the present invention also provides a kind of said method to make.
The present invention also provides the positive pole of above-mentioned Graphene electrodes sheet for lithium-ion capacitor.
Graphene electrodes sheet prepared by the present invention, be used as after the positive pole of lithium-ion capacitor, its energy density can reach 113 ~ 136wh/kg, 103.8wh/kg compared with document (Journal of Power Sources 177 (2008) 643-651) report has had raising, exceed the energy density 60 ~ 80wh/kg of Ni-MH battery, reached the energy density 113 ~ 136wh/kg of lithium ion battery.
Accompanying drawing explanation
Fig. 1 is preparation technology's flow chart of Graphene electrodes sheet of the present invention.
Embodiment
The preparation method of Graphene electrodes sheet provided by the invention, as shown in Figure 1, comprises the steps:
(1) graphite oxide is added to the water, ultrasonic 1 ~ 5h forms the suspension that concentration is 0.1 ~ 10mg/ml;
(2) suspension is spin-coated on collector, drying and volatilizing solvent, repeats spin coating, drying steps repeatedly, obtains the thickness 20 ~ 200um of presoma electrode slice;
(3) the presoma electrode slice obtaining is placed under generating laser, employing wavelength is that the infrared light under 760 ~ 1200nm irradiates presoma electrode slice surface repeatedly, until presoma electrode slice surface color becomes black completely from golden yellow, now, stop irradiating, obtain Graphene electrodes sheet.
In above-mentioned steps (2), collector can be selected aluminium foil, nickel screen, stainless steel substrates, titanium foil, goldleaf etc.
The present invention is the moment high-energy producing based on laser, by Infrared irradiation on the graphene oxide on presoma electrode slice surface, oxygen-containing functional group is reduced, Graphene well can be peeled off, one step has realized the preparation of the preparation of Graphene and electrode slice, simplified production technology, be prepared into electrode slice does not need to add conductive agent and binding agent conductivity can reach 15S/cm left and right simultaneously yet, can use as electrode slice completely.
Graphene electrodes sheet prepared by the present invention, be used as after the positive pole of lithium-ion capacitor, its energy density can reach 113 ~ 136wh/kg, 103.8wh/kg compared with document (Journal ofPower Sources 177 (2008) 643651) report has had raising, exceed the energy density 60 ~ 80wh/kg of Ni-MH battery, reached the energy density 113 ~ 136wh/kg of lithium ion battery.
The above-mentioned Graphene electrodes sheet making can be used for ultracapacitor, lithium ion battery, lithium-ion capacitor
Deng energy storage device.Below introduce the preparation method of lithium-ion capacitor:
1, lithium-ion capacitor positive pole
Directly select the Graphene electrodes sheet of preparing as positive pole above;
2, lithium-ion capacitor negative pole
First, select commercial li-ion cell negative electrode material (graphite, soft carbon, hard charcoal, silicon/carbon, Graphene etc.) as negative active core-shell material,
Secondly, the ratio that is 85:5:10 according to mass ratio, active material, Kynoar binding agent and conductive agent acetylene black are mixed, obtain slurry;
Finally, slurry is coated on Copper Foil, drying, roll film, trimming processing, make super capacitor anode sheet.
3, the assembling of ultracapacitor
The whole assembling process of lithium-ion capacitor all carries out in the glove box of anhydrous and oxygen-free, first at one of the surface label of negative plate and the equal-sized lithium sheet of pole piece,
By positive plate, barrier film, negative plate in order stack of laminations dress up battery core, then use battery housing seal battery core, in battery container, inject electrolyte by the liquid injection port being arranged on battery container subsequently, sealing liquid injection port, obtains lithium-ion capacitor.
The concentration of electrolyte is generally 1mol/L, and the solute in electrolyte is LiPF
6, LiBF
4, LiTFSI (LiN (SO
2cF
3)
2), LiFSI (LiN (SO
2f)
2), solvent is one or more mixing in dimethyl carbonate, diethyl carbonate, propene carbonate, ethylene carbonate, acetonitrile.
Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in further detail.
(1) graphite oxide is added to the water, ultrasonic 1h forms the suspension that concentration is 0.1mg/ml;
(2) suspension is spin-coated on aluminium foil, drying and volatilizing solvent, repeats spin coating, drying steps repeatedly, and the thickness of controlling presoma electrode slice is 20um;
(3) the presoma electrode slice obtaining is placed under generating laser, employing wavelength is that the infrared light under 760nm irradiates repeatedly on presoma electrode slice surface, until presoma electrode slice surface color China ink becomes black completely from golden yellow, obtains Graphene electrodes sheet.
(1) graphite oxide is added to the water, ultrasonic 5h forms the suspension that concentration is 10mg/ml;
(2) suspension is spin-coated on nickel screen, drying and volatilizing solvent, repeats spin coating, drying steps repeatedly, and the thickness of controlling presoma electrode slice is 200um;
(3) the presoma electrode slice obtaining is placed under generating laser, employing wavelength is that the infrared light under 1200nm irradiates repeatedly on presoma electrode slice surface, until presoma electrode slice surface color China ink becomes black completely from golden yellow, obtain Graphene electrodes sheet.
(1) graphite oxide is added to the water, ultrasonic 2h forms the suspension that concentration is 1mg/ml;
(2) suspension is spin-coated on stainless steel substrates, drying and volatilizing solvent, repeats spin coating, drying steps repeatedly, and the thickness of controlling presoma electrode slice is 50um;
(3) the presoma electrode slice obtaining is placed under generating laser, employing wavelength is that the infrared light under 785nm irradiates repeatedly on presoma electrode slice surface, until presoma electrode slice surface color China ink becomes black completely from golden yellow, obtains Graphene electrodes sheet.
Embodiment 4
(1) graphite oxide is added to the water, ultrasonic 3h forms the suspension that concentration is 2mg/ml;
(2) suspension is spin-coated on titanium foil, drying and volatilizing solvent, repeats spin coating, drying steps repeatedly, and the thickness of controlling presoma electrode slice is 100um;
(3) the presoma electrode slice obtaining is placed under generating laser, employing wavelength is that the infrared light under 800nm irradiates repeatedly on presoma electrode slice surface, until presoma electrode slice surface color China ink becomes black completely from golden yellow, obtains Graphene electrodes sheet.
Embodiment 5
(1) graphite oxide is added to the water, ultrasonic 4h forms the suspension that concentration is 5mg/ml;
(2) suspension is spin-coated on goldleaf, drying and volatilizing solvent, repeats spin coating, drying steps repeatedly, and the thickness of controlling presoma electrode slice is 150um;
(3) the presoma electrode slice obtaining is placed under generating laser, employing wavelength is that the infrared light under 100nm irradiates repeatedly on presoma electrode slice surface, until presoma electrode slice surface color China ink becomes black completely from golden yellow, obtains Graphene electrodes sheet.
Embodiment 6
1, lithium-ion capacitor positive pole
Directly select Graphene electrodes sheet prepared by embodiment 1 as positive pole;
2, lithium-ion capacitor negative pole
First, select commercial li-ion cell negative electrode material graphite as negative active core-shell material,
Secondly, the ratio that is 85:5:10 according to mass ratio, graphite, Kynoar binding agent and conductive agent acetylene black are mixed, obtain slurry;
Finally, slurry is coated on Copper Foil, drying, roll film, trimming processing, make super capacitor anode sheet.
3, the assembling of ultracapacitor
The whole assembling process of lithium-ion capacitor all carries out in the glove box of anhydrous and oxygen-free, first at one of the surface label of negative plate and the equal-sized lithium sheet of pole piece,
By positive plate, barrier film, negative plate in order stack of laminations dress up battery core, then use battery housing seal battery core, subsequently by being arranged on liquid injection port on battery container toward the LiPF that injects 1mol/L in battery container
6/ dimethyl carbonate electrolyte, sealing liquid injection port, obtains lithium ion battery.
Embodiment 7 ~ 10 is with the difference of embodiment 6: positive pole is respectively the prepared Graphene electrodes sheet out of embodiment 2 ~ 5, and negative active core-shell material adopts respectively soft carbon, hard charcoal, silicon/carbon, Graphene, and electrolyte is respectively the LiBF of 1mol/L
4the LiTFSI/ propene carbonate electrolyte of/diethyl carbonate electrolyte, 1mol/L, the LiFSI/ ethylene carbonate of 1mol/L, the LiPF of 1mol/L
6/ acetonitrile electrolyte.
The result that table 1 carries out conductivity test for the electrode slice of embodiment 1 ~ 5 preparation.
Table 1
| ? | |
|
|
Embodiment 4 | Embodiment 5 |
| Conductivity s/cm | 15.2 | 14.3 | 15.6 | 14.8 | 14.6 |
As shown in Table 1, Graphene electrodes sheet prepared by the present invention, in the situation that not adding conductive agent, just can reach 14.3 ~ 15.6s/cm, with respect to the conductivity (0.1 ~ 1s/cm) of activated carbon electrodes, have greatly and improved, can meet the requirement discharging and recharging under large multiplying power.
Table 2 carries out charge-discharge test result for embodiment 6 ~ 10 under 1C electric current.
Table 2
| ? | Embodiment 6 | Embodiment 7 | Embodiment 8 | Embodiment 9 | Embodiment 10 |
| Energy density wh/kg | 113 | 123 | 121 | 136 | 132 |
As shown in Table 2, when the Graphene electrodes sheet that adopts the present invention to prepare is prepared into lithium-ion capacitor, its energy density can reach 113 ~ 136wh/kg, 103.8wh/kg compared with bibliographical information has had raising, exceed the energy density 60 ~ 80wh/kg of Ni-MH battery, reached the energy density 113 ~ 136wh/kg of lithium ion battery.
Should be understood that, the above-mentioned statement for preferred embodiment of the present invention is comparatively detailed, can not therefore think the restriction to scope of patent protection of the present invention, and scope of patent protection of the present invention should be as the criterion with claims.
Claims (5)
1. a preparation method for Graphene electrodes sheet, is characterized in that, comprises the steps:
Graphite oxide is added to the water, ultrasonic 1 ~ 5h, the suspension that formation concentration is 0.1 ~ 10mg/ml;
Suspension is spin-coated on collector, dry, obtain presoma electrode slice;
Presoma electrode slice is placed under generating laser, and employing wavelength is that the infrared light under 760 ~ 1200nm irradiates presoma electrode slice repeatedly, obtains Graphene electrodes sheet.
2. the preparation method of Graphene electrodes sheet according to claim 1, is characterized in that, described collector is aluminium foil, nickel screen, stainless steel substrates, titanium foil or goldleaf.
3. the preparation method of Graphene electrodes sheet according to claim 1, is characterized in that, in the time that suspension is spin-coated on collector, need to spin coating repeatedly after drying and volatilizing solvent, dry, and the thickness of controlling presoma electrode slice is 20 ~ 200um.
4. a Graphene electrodes sheet, is characterized in that, it is made by any described method of claim 1 ~ 3.
5. described in claim 4, Graphene electrodes sheet is used to the positive pole of lithium-ion capacitor.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104252974A (en) * | 2014-09-18 | 2014-12-31 | 电子科技大学 | Method for manufacturing composite film material |
| CN104810163A (en) * | 2014-07-18 | 2015-07-29 | 纳米新能源（唐山）有限责任公司 | Graphene supercapacitor and preparation method thereof, and energy storage system |
| CN104916459A (en) * | 2015-06-29 | 2015-09-16 | 东华大学 | Preparation method of highly-oriented graphene film for supercapacitor |
| CN106784596A (en) * | 2016-11-18 | 2017-05-31 | 杭州电子科技大学 | One kind prepares binder free Graphene/SnO using laser irradiation original position2The method of combination electrode |
| CN109671572A (en) * | 2018-07-27 | 2019-04-23 | 纳智源科技（唐山）有限责任公司 | Electrode, supercapacitor and preparation method thereof |
| CN114068878A (en) * | 2020-07-30 | 2022-02-18 | 通用汽车环球科技运作有限责任公司 | Formulation and fabrication of thick cathodes |
| CN114349511A (en) * | 2022-01-18 | 2022-04-15 | 南京工业大学 | Method for rapidly preparing high-conductivity graphene electromagnetic shielding film |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810163A (en) * | 2014-07-18 | 2015-07-29 | 纳米新能源（唐山）有限责任公司 | Graphene supercapacitor and preparation method thereof, and energy storage system |
| CN104810163B (en) * | 2014-07-18 | 2017-08-08 | 纳米新能源（唐山）有限责任公司 | Preparation method, graphene ultracapacitor and the energy-storage system of graphene ultracapacitor |
| CN104252974A (en) * | 2014-09-18 | 2014-12-31 | 电子科技大学 | Method for manufacturing composite film material |
| CN104916459A (en) * | 2015-06-29 | 2015-09-16 | 东华大学 | Preparation method of highly-oriented graphene film for supercapacitor |
| CN104916459B (en) * | 2015-06-29 | 2018-01-02 | 东华大学 | A kind of preparation method of the highly oriented graphene film of ultracapacitor |
| CN106784596A (en) * | 2016-11-18 | 2017-05-31 | 杭州电子科技大学 | One kind prepares binder free Graphene/SnO using laser irradiation original position2The method of combination electrode |
| CN109671572A (en) * | 2018-07-27 | 2019-04-23 | 纳智源科技（唐山）有限责任公司 | Electrode, supercapacitor and preparation method thereof |
| CN114068878A (en) * | 2020-07-30 | 2022-02-18 | 通用汽车环球科技运作有限责任公司 | Formulation and fabrication of thick cathodes |
| CN114349511A (en) * | 2022-01-18 | 2022-04-15 | 南京工业大学 | Method for rapidly preparing high-conductivity graphene electromagnetic shielding film |
| CN114349511B (en) * | 2022-01-18 | 2022-11-22 | 南京工业大学 | Method for rapidly preparing high-conductivity graphene electromagnetic shielding film |
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Application publication date: 20140611 |