CN104134785A - Preparation method of binder-free negative electrode material of lithium ion battery - Google Patents
Preparation method of binder-free negative electrode material of lithium ion battery Download PDFInfo
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- CN104134785A CN104134785A CN201410390926.6A CN201410390926A CN104134785A CN 104134785 A CN104134785 A CN 104134785A CN 201410390926 A CN201410390926 A CN 201410390926A CN 104134785 A CN104134785 A CN 104134785A
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- lithium ion
- ion battery
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- graphite
- arc discharge
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 26
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000007773 negative electrode material Substances 0.000 title abstract 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 88
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 72
- 239000010439 graphite Substances 0.000 claims abstract description 72
- 239000011230 binding agent Substances 0.000 claims abstract description 11
- 238000007599 discharging Methods 0.000 claims abstract description 11
- 238000010891 electric arc Methods 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 18
- 230000008021 deposition Effects 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 abstract description 36
- 239000007772 electrode material Substances 0.000 abstract description 25
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 5
- 239000002086 nanomaterial Substances 0.000 abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 2
- 239000011889 copper foil Substances 0.000 abstract description 2
- 238000009776 industrial production Methods 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 1
- 239000002131 composite material Substances 0.000 abstract 1
- 150000001875 compounds Chemical class 0.000 abstract 1
- 230000001351 cycling effect Effects 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 abstract 1
- 239000011888 foil Substances 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 12
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 12
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 11
- 229910052744 lithium Inorganic materials 0.000 description 11
- 238000001241 arc-discharge method Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 229910013870 LiPF 6 Inorganic materials 0.000 description 6
- 229910052786 argon Inorganic materials 0.000 description 6
- 230000004888 barrier function Effects 0.000 description 6
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 6
- 239000003792 electrolyte Substances 0.000 description 6
- 230000003068 static effect Effects 0.000 description 6
- 239000002048 multi walled nanotube Substances 0.000 description 4
- 239000002006 petroleum coke Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000002041 carbon nanotube Substances 0.000 description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007770 graphite material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002931 mesocarbon microbead Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 241000446313 Lamella Species 0.000 description 1
- 229910018095 Ni-MH Inorganic materials 0.000 description 1
- 229910018477 Ni—MH Inorganic materials 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002079 cooperative effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002389 environmental scanning electron microscopy Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002847 impedance measurement Methods 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 239000002071 nanotube Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/364—Composites as mixtures
-
- 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 preparation method of a binder-free negative electrode material of a lithium ion battery, belonging to the technical field of nano material preparation process. The electrode material, which is based on a multi-walled carbon nanotube-graphite flake layer composite structure, has a special structure, dispenses with a binder with high-molecular compounds and a metal copper foil or aluminum foil current collector, is high in conductivity and specific capacity, and shows favorable charging/discharging cycling performance. The preparation method provided by the invention is simple in operation and low in cost, and at the same time, the process of producing a lithium ion battery electrode by the negative electrode material is simple and is easy to control and suitable for industrial production.
Description
Technical field
The invention belongs to battery power field, be specifically related to the preparation method of lithium ion battery negative material of multi-walled carbon nano-tubes-graphite flake layer mixed structure of a kind of binder free and collector.
Background technology
Compare with traditional nickel-cadmium cell, Ni-MH battery, lithium ion battery has that open circuit voltage is high, can force density large, memory-less effect, long service life, of low pollution and the advantage such as self-discharge rate is little.Since nineteen ninety, Sony adopted petroleum coke as lithium ion battery negative, carbonaceous negative material just gets more and more people's extensive concerning.Carbonaceous material has that specific capacity is high, electrode potential is low (is less than 1.0 V
vs.li
+/ Li), have extended cycle life, cycle efficieny high (being greater than 95%) and the advantage such as cost is lower.The more carbonaceous material of research has graphite, MCMB, petroleum coke and carbon nanomaterial etc. at present.Wherein, graphite has good layer structure, there is good voltage platform, but its specific capacity only has 372 mAh/g, in this external charge and discharge process, graphite layers is larger apart from changing, make lithium and organic solvent jointly insert graphite layers, easily cause graphite linings to peel off, reduce graphite material life-span, the as seen lithium ion battery negative material of its far from ideal; MCMB has large embedding lithium capacity, but the high cost of manufacture that makes of heat treatment temperature is high, and has the shortcomings such as electrode potential is too high, voltage delay, cannot commercial applications; Petroleum coke has amorphous state, but can cause volumetric expansion during its embedding lithium, reduces battery life; Nanotube and nano particle in carbon nanomaterial are nano-scale, their clearance space is also Nano grade, can provide a large amount of embedded spaces for lithium ion, make it have good embedding lithium characteristic, the charge/discharge capacity and the cycle life that are conducive to lithium ion battery, but there is voltage delay and the shortcoming such as charge and discharge potential platform is not obvious in it.
Although there is at present the non-carbon class negative material much with development prospect to be likely applied to commercial lithium-ion batteries field, but still be faced with lot of challenges, therefore,, in recent industrial applications, the raising of performance of lithium ion battery will depend on the development and perfection of carbon negative pole material.This wherein combines two kinds of carbon negative pole materials and forms the material with carbon element of new structure, be not both component brings out the best in each other in performance, can produce cooperative effect, thereby make its combination property obviously be better than one-component, make it be expected to become the desirable negative material of lithium ion battery of new generation.
Summary of the invention
Deficiency in view of above-mentioned existing investigative technique, the invention provides a kind of preparation method of binder free lithium ion battery negative material, after the heat treatment of round pie multi-walled carbon nano-tubes-graphite flake layer mixed structure material that the method is prepared with arc discharge method in air atmosphere, directly as lithium ion battery negative.
Technical scheme of the present invention is as follows:
A preparation method for binder free lithium ion battery negative material, comprises the following steps:
A. by different horizontal or vertical being placed in arc discharge chamber of two pure graphite rods of diameter, the little graphite rod of diameter is as anode, and the large graphite rod of diameter is as negative electrode;
B. switch on power, yin, yang graphite electrode has contacted arc discharge, and adjusting discharging current is 60 ~ 100A, keeps current constant;
C. arc discharge, after 2 ~ 5 minutes, has formed a cylinder at negative electrode graphite rod surface deposition, takes out cylinder, is cut to the thin slice that thickness is about 1 ~ 2 millimeter; Wherein the diameter of cylinder is determined by the diameter of graphite anode rod, and thickness thickens with the increase of discharge time;
D. by thin slice heat treatment a period of time in air atmosphere, obtain lithium ion battery negative material.
Described heat treatment temperature is 700 ~ 800 degrees Celsius.
Described heat treatment temperature is 750 degrees Celsius.
Described heat treatment time is 15 ~ 30 minutes.
Described discharging current is 80A.
Thin slice after heat treatment, directly as lithium ion battery negative material, is assembled into button cell in inert-atmosphere glove box, and it is carried out to performance test.
The present invention has following beneficial effect:
Preparation method's technique of the present invention is simple, and production cost is low, and the lithium ion battery negative material that the method makes due to oxidation, increases the hole of mixed structure material in heat treatment process, is conducive to increase specific area, increases electrode capacity; Meanwhile, avoid using the binding agent of macromolecular compound composition and the collector of metal copper foil or aluminium foil, be conducive to reduce the resistance in removal lithium embedded process, therefore there is higher conductance and specific capacity, and good charge-discharge performance.The material assembling lithium ion cell electrode operation that the inventive method makes is simple, and process is easily controlled, and is applicable to industrial production.
Accompanying drawing explanation
Fig. 1 is ESEM (SEM) figure to round pie multi-walled carbon nano-tubes-graphite flake layer mixed structure electrode material internal structure in embodiment 5.Wherein, the carbon cylinder (a) being parallel to each other; (b) surface topography of mixed structure electrode material, can see that the orthogonal array that carbon cylinder is parallel to each other comes together; (c) the wire carbon nano-tube between carbon cylinder; (d) high-purity multi-walled carbon nano-tubes between carbon cylinder; (e) pattern of carbon cylinder inside, is comprised of multi-walled carbon nano-tubes and a large amount of graphite particle; (f) the hard shell of mixed structure electrode material that " shale " shape graphite forms.
Fig. 2 for by Fig. 1 provide round pie multi-walled carbon nano-tubes-graphite flake layer mixed structure electrode material plane plan structure schematic diagram.Mixed structure electrode material presents nucleocapsid structure, by the material of two kinds of different-shapes, formed, in the middle of soft region and the hard region of shell.Black region in the middle of a large amount of carbon nano-tube is present in, graphite material forms hard shell.
Fig. 3 is for providing the vertical section structural representation of round pie multi-walled carbon nano-tubes-graphite flake layer mixed structure electrode material by Fig. 1.
Fig. 4 is the AC impedance figure of round pie multi-walled carbon nano-tubes-graphite flake layer mixed structure electrode material in embodiment 5.AC impedance curve is comprised of the semicircle of a high frequency region and the line segment of low frequency range, the intercept of high frequency section on real axis is the all-in resistance of electrode material, be 4.5 ohm, illustrate that multi-walled carbon nano-tubes-graphite flake layer mixed structure is conducive to reduce the electric transmission resistance of electrode material.
Fig. 5 is round pie multi-walled carbon nano-tubes-graphite flake layer mixed structure electrode material cycle performance under 25,50 and 100 mA/g current strength respectively in embodiment 5.Can find out, the volume change Amplitude Ratio that circulation precontract is 20 times is larger, tends towards stability for approximately 20 times later, and the capacity under 25,50 and 100 mA/g current strength is about respectively 500,350 and 110 mAh/g.
In figure, 1 for being piled up the rigid shell of the structure that is similar to " shale " shape forming by lamellar graphite lamella; 2 is carbon cylinder, and 3 is the multi-walled carbon nano-tubes of carbon cylinder inside, and 4 is the multi-walled carbon nano-tubes between carbon cylinder, and 5 is graphite particle.
Embodiment
Below by preferred specific embodiment, the invention will be further described.
What in an embodiment of the present invention, multi-walled carbon nano-tubes-graphite flake layer mixed structure electrode material is carried out to the employing of scanning electron microscopy phenetic analysis is Zeiss, Germany (Zeiss) ∑ IGMA/VP type field emission scanning electron microscope.
In an embodiment of the present invention, the ac impedance measurement of multi-walled carbon nano-tubes-graphite flake layer mixed structure electrode material is adopted to the CHI660D type electrochemical workstation of Shanghai Chen Hua Instrument Ltd., cycle performance test adopts the blue electric CT2001A type LAND battery test system in Wuhan.
embodiment 1
By diameter, be respectively horizontal or vertical being placed in arc discharge chamber of two pure graphite rods of 8,10 millimeters, the little graphite rod of diameter is as anode, and the large graphite rod of diameter is as negative electrode; Switch on power, yin, yang graphite electrode has contacted arc discharge, regulates 60 A of discharging current, keeps current constant; After arc discharge 5 minutes, at negative electrode graphite rod surface deposition, formed a cylinder (being round pie multi-walled carbon nano-tubes-graphite flake layer mixed structure electrode material), thickness prepared by arc discharge method is about 3 ~ 5 millimeters of round pie multi-walled carbon nano-tubes-graphite flake layer mixed structure electrode materials, and to cut into thickness be the thin slice of 1 ~ 2 millimeter, then in air atmosphere in 700 degrees Celsius of heat treatments 15 minutes.In the glove box of high-purity argon inert atmosphere, assembling CR 2016 button cells, wherein, is lithium sheet to electrode, and electrolyte is 1mol/L LiPF
6ethylene carbonate (EC) and dimethyl carbonate (DMC) solution (EC:DEC=1:2), barrier film is Celgard 2500.By static 12 hours of the battery assembling, in order to test.
embodiment 2
By diameter, be respectively horizontal or vertical being placed in arc discharge chamber of two pure graphite rods of 8,10 millimeters, the little graphite rod of diameter is as anode, and the large graphite rod of diameter is as negative electrode; Switch on power, yin, yang graphite electrode has contacted arc discharge, regulates 80 A of discharging current, keeps current constant; After arc discharge 3 minutes, at negative electrode graphite rod surface deposition, formed a cylinder (being round pie multi-walled carbon nano-tubes-graphite flake layer mixed structure electrode material), thickness prepared by arc discharge method is about 3 ~ 5 millimeters of round pie multi-walled carbon nano-tubes-graphite flake layer mixed structure electrode materials, and to cut into thickness be the thin slice of 1 ~ 2 millimeter, then in air atmosphere in 750 degrees Celsius of heat treatments 15 minutes.In the glove box of high-purity argon inert atmosphere, assembling CR 2016 button cells, wherein, is lithium sheet to electrode, and electrolyte is 1mol/L LiPF
6ethylene carbonate (EC) and dimethyl carbonate (DMC) solution (EC:DEC=1:2), barrier film is Celgard 2500.By static 12 hours of the battery assembling, in order to test.
embodiment 3
By diameter, be respectively horizontal or vertical being placed in arc discharge chamber of two pure graphite rods of 8,10 millimeters, the little graphite rod of diameter is as anode, and the large graphite rod of diameter is as negative electrode; Switch on power, yin, yang graphite electrode has contacted arc discharge, regulates 100 A of discharging current, keeps current constant; After arc discharge 2 minutes, at negative electrode graphite rod surface deposition, formed a cylinder (being round pie multi-walled carbon nano-tubes-graphite flake layer mixed structure electrode material), thickness prepared by arc discharge method is about 3 ~ 5 millimeters of round pie multi-walled carbon nano-tubes-graphite flake layer mixed structure electrode materials, and to cut into thickness be the thin slice of 1 ~ 2 millimeter, then in air atmosphere in 800 degrees Celsius of heat treatments 15 minutes.In the glove box of high-purity argon inert atmosphere, assembling CR 2016 button cells, wherein, is lithium sheet to electrode, and electrolyte is 1mol/L LiPF
6ethylene carbonate (EC) and dimethyl carbonate (DMC) solution (EC:DEC=1:2), barrier film is Celgard 2500.By static 12 hours of the battery assembling, in order to test.
embodiment 4
By diameter, be respectively horizontal or vertical being placed in arc discharge chamber of two pure graphite rods of 8,10 millimeters, the little graphite rod of diameter is as anode, and the large graphite rod of diameter is as negative electrode; Switch on power, yin, yang graphite electrode has contacted arc discharge, regulates 60 A of discharging current, keeps current constant; After arc discharge 5 minutes, at negative electrode graphite rod surface deposition, formed a cylinder (being round pie multi-walled carbon nano-tubes-graphite flake layer mixed structure electrode material), thickness prepared by arc discharge method is about 3 ~ 5 millimeters of round pie multi-walled carbon nano-tubes-graphite flake layer mixed structure electrode materials, and to cut into thickness be the thin slice of 1 ~ 2 millimeter, then in air atmosphere in 700 degrees Celsius of heat treatments 30 minutes.In the glove box of high-purity argon inert atmosphere, assembling CR 2016 button cells, wherein, is lithium sheet to electrode, and electrolyte is 1mol/L LiPF
6ethylene carbonate (EC) and dimethyl carbonate (DMC) solution (EC:DEC=1:2), barrier film is Celgard 2500.By static 12 hours of the battery assembling, in order to test.
embodiment 5
By diameter, be respectively horizontal or vertical being placed in arc discharge chamber of two pure graphite rods of 8,10 millimeters, the little graphite rod of diameter is as anode, and the large graphite rod of diameter is as negative electrode; Switch on power, yin, yang graphite electrode has contacted arc discharge, regulates 80 A of discharging current, keeps current constant; After arc discharge 3 minutes, at negative electrode graphite rod surface deposition, formed a cylinder (being round pie multi-walled carbon nano-tubes-graphite flake layer mixed structure electrode material), thickness prepared by arc discharge method is about 3 ~ 5 millimeters of round pie multi-walled carbon nano-tubes-graphite flake layer mixed structure electrode materials, and to cut into thickness be the thin slice of 1 ~ 2 millimeter, then in air atmosphere in 750 degrees Celsius of heat treatments 30 minutes.In the glove box of high-purity argon inert atmosphere, assembling CR 2016 button cells, wherein, is lithium sheet to electrode, and electrolyte is 1mol/L LiPF
6ethylene carbonate (EC) and dimethyl carbonate (DMC) solution (EC:DEC=1:2), barrier film is Celgard 2500.By static 12 hours of the battery assembling, in order to test.
embodiment 6
By diameter, be respectively horizontal or vertical being placed in arc discharge chamber of two pure graphite rods of 8,10 millimeters, the little graphite rod of diameter is as anode, and the large graphite rod of diameter is as negative electrode; Switch on power, yin, yang graphite electrode has contacted arc discharge, regulates 100 A of discharging current, keeps current constant; After arc discharge 2 minutes, at negative electrode graphite rod surface deposition, formed a cylinder (being round pie multi-walled carbon nano-tubes-graphite flake layer mixed structure electrode material), thickness prepared by arc discharge method is about 3 ~ 5 millimeters of round pie multi-walled carbon nano-tubes-graphite flake layer mixed structure electrode materials, and to cut into thickness be the thin slice of 1 ~ 2 millimeter, then in air atmosphere in 800 degrees Celsius of heat treatments 30 minutes.In the glove box of high-purity argon inert atmosphere, assembling CR 2016 button cells, wherein, is lithium sheet to electrode, and electrolyte is 1mol/L LiPF
6ethylene carbonate (EC) and dimethyl carbonate (DMC) solution (EC:DEC=1:2), barrier film is Celgard 2500.By static 12 hours of the battery assembling, in order to test.
More than describe preferred embodiment of the present invention in detail.The ordinary skill that should be appreciated that this area just can design according to the present invention be made many modifications and variations without creative work.Therefore, all technical staff in the art, all should be in by the determined protection range of the claims in the present invention book under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (5)
1. a preparation method for binder free lithium ion battery negative material, is characterized in that, comprises the following steps:
A. by different horizontal or vertical being placed in arc discharge chamber of two pure graphite rods of diameter, the little graphite rod of diameter is as anode, and the large graphite rod of diameter is as negative electrode;
B. switch on power, yin, yang graphite electrode has contacted arc discharge, and adjusting discharging current is 60 ~ 100A, keeps current constant;
C. arc discharge, after 2 ~ 5 minutes, has formed a cylinder at negative electrode graphite rod surface deposition, takes out cylinder, is cut to the thin slice that thickness is about 1 ~ 2 millimeter;
D. by thin slice heat treatment a period of time in air atmosphere, obtain lithium ion battery negative material.
2. the preparation method of binder free lithium ion battery negative material according to claim 1, is characterized in that: described heat treatment temperature is 700 ~ 800 degrees Celsius.
3. the preparation method of binder free lithium ion battery negative material according to claim 2, is characterized in that: described heat treatment temperature is 750 degrees Celsius.
4. the preparation method of binder free lithium ion battery negative material according to claim 1, is characterized in that: described heat treatment time is 15 ~ 30 minutes.
5. the preparation method of binder free lithium ion battery negative material according to claim 1, is characterized in that: described discharging current is 80A.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111081992A (en) * | 2019-10-12 | 2020-04-28 | 开封大学 | Preparation method of binder-free lithium ion battery negative electrode material |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100497244B1 (en) * | 2002-12-27 | 2005-06-28 | 삼성에스디아이 주식회사 | Negative active material for lithium secondary battery and method of preparing same |
| CN1747218A (en) * | 2004-09-03 | 2006-03-15 | 香港科技大学 | The lithium ion battery of incorporating carbon nanostructure materials |
| JP2008095163A (en) * | 2006-10-16 | 2008-04-24 | Osaka Univ | Method of forming nanometal particle and method of forming nanometal thin film, and method of controlling size of nanometal particle |
| CN102730666A (en) * | 2011-04-15 | 2012-10-17 | 上海大学 | Method for preparing carbon nano-wires |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100497244B1 (en) * | 2002-12-27 | 2005-06-28 | 삼성에스디아이 주식회사 | Negative active material for lithium secondary battery and method of preparing same |
| CN1747218A (en) * | 2004-09-03 | 2006-03-15 | 香港科技大学 | The lithium ion battery of incorporating carbon nanostructure materials |
| JP2008095163A (en) * | 2006-10-16 | 2008-04-24 | Osaka Univ | Method of forming nanometal particle and method of forming nanometal thin film, and method of controlling size of nanometal particle |
| CN102730666A (en) * | 2011-04-15 | 2012-10-17 | 上海大学 | Method for preparing carbon nano-wires |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111081992A (en) * | 2019-10-12 | 2020-04-28 | 开封大学 | Preparation method of binder-free lithium ion battery negative electrode material |
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