CN102412397A - Co3O4 nano lamellar material and preparation method and application thereof - Google Patents

Co3O4 nano lamellar material and preparation method and application thereof Download PDF

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CN102412397A
CN102412397A CN2011103197910A CN201110319791A CN102412397A CN 102412397 A CN102412397 A CN 102412397A CN 2011103197910 A CN2011103197910 A CN 2011103197910A CN 201110319791 A CN201110319791 A CN 201110319791A CN 102412397 A CN102412397 A CN 102412397A
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nano
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cobalt
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刘艳
武英
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Shanghai Institute of Technology
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Abstract

The invention discloses a Co3O4 nano lamellar material and a preparation method and application thereof. The preparation method comprises the following steps of: mixing cobalt salt, a surfactant, a precipitator and deioned water in stoichiometric ratio; transferring the mixed solution into a reaction kettle and carrying out hydro-thermal reaction for 17.5-18.5 hours at 115-125 DEG C; and then washing and drying to obtain a powdery mixed precursor; and carrying out heat treatment on the powdery mixed precursor in air to finally obtain the Co3O4 nano lamellar material. The prepared Co3O4 material is of a regular nano lamellar structure, and can be applied to the negative electrode of a chargeable lithium ion battery so as to improve the storage capacity of lithium.

Description

A kind of Co 3O 4The nano-sheet material
Technical field
The present invention relates to a kind of Co that is used for lithium ion battery negative material 3O 4Nano-sheet material and preparation method thereof.
Technical background
In recent ten years, oneself is widely used in the mobile electronic terminal apparatus field to lithium ion battery with its high-performance advantage.Co 3O 4Because of advantages such as height ratio capacity receive certain concern [1].Researchers are to Co 3O 4The electrode material structure nanoization is improved its storage lithium performance, and proposes special construction more specific area can be provided, and providing is enough to the fine passage of embedding and the contact-making surface of electrolyte/electrode of taking off of lithium ion, thereby promotes the carrying out [2] of electrochemical reaction.
At present, Wan group [3] has made Co 3O 4Micro nano structure, Korea S Sun group [4] has prepared microspheroidal Co through citric acid as complexing agent ultrasonic pyrolysis spray-on process 3O 4Structural material.Just research is reported at present; Special construction has that good electricity is led, surface and architectural characteristic; When shortening the taking off of lithium ion/embedding response path, it can improve the multiplying power property of lithium ion battery, and the pattern of particle, size have far-reaching influence to chemical property.But problems such as the reunion of the particle of this material in charge and discharge process, structural stability difference have caused shortcomings such as the irreversible first inefficiency, cyclical stability difference of this material.Research and develop a general difficult problem that is faced in order to solve this, and the present invention provides a kind of Co just in order to address this problem 3O 4The nano-sheet material provides a kind of this kind preparation methods simultaneously.Our this invention just is directed against in the preparation and research of special appearance nano structure electrode material, and emphasis is considered Co 3O 4The size of material and nano-sheet pattern influence electrochemical behavior, and then solve Co 3O 4The reunion of the particle of material in charge and discharge process, the problem of structural stability difference.
List of references
[1]?P.?Poizot,?S.?Laruelle,?S.?Grugeon,?L.?Dupont,?J.?M.?Tarascon,?Nature?407?(2000)?496.
[2]?G.?Binotto,?D.?Larcher,?A.S.?Prakash,?R.H.?Urbina,?M.S.?Hegde,?J.M.?Tarascon,?Chem.?Mater.,?19?(2007)?3032.
[3]?A.M.?Cao,?J.S.?Hu,?H.P.?Liang,?W.G?Song,?L.J.?Wan,?X.L.?He,?X.G.?Gao,?S.H.?Xia,?J.?Phys.?Chem.?B?110?(2006)?15858.
[4]?S.W.?Oh,?H.J.?Bang,?Y.K.?Sun,?J.?Power?Sources?173?(2007)?502.
Summary of the invention
One of the object of the invention provides a kind of Co of even grain size 3O 4The nano-sheet material.
Two of the object of the invention provides the Co of above-mentioned a kind of even grain size 3O 4The nano-sheet preparation methods.
Three of the object of the invention provides the Co of above-mentioned a kind of even grain size 3O 4The nano-sheet material is used for the application process of the negative material of lithium ion battery.
Technical scheme of the present invention
A kind of Co 3 O 4 The nano-sheet preparation methods
A kind of Co 3O 4The nano-sheet preparation methods, this method comprises the steps:
(1), with cobalt salt, surfactant, precipitation reagent mix with water the back stir 30
Figure 369018DEST_PATH_IMAGE001
60min; Carry out hydro-thermal reaction in the autoclave with whole mixed solution immigration inner liner polytetrafluoroethylene; The control hydrothermal temperature be 115
Figure 414335DEST_PATH_IMAGE001
125 ℃; Be preferably 120 ℃; Time be 17.5
Figure 871861DEST_PATH_IMAGE001
18.5h; Be preferably 18h, get reactant liquor;
Wherein said cobalt salt is a kind of in cobalt nitrate, cobalt acetate, cobalt carbonate or the cobalt oxalate, is preferably cobalt nitrate;
Said surfactant is cetyl trimethyl ammonia bromide (CTAB);
Described precipitation reagent is urea (H 2NCONH 2);
Wherein the mixing ratio of cobalt salt, surfactant, precipitation reagent and water is calculated in molar ratio; Be cobalt salt: surfactant: precipitation reagent: water is 1:2:3:266.67 355.56; The mixing ratio of cobalt salt, surfactant, precipitation reagent and water is calculated in molar ratio, i.e. cobalt salt: surfactant: precipitation reagent: water is preferably 1:2:3:333.33;
The filling degree of autoclave be 60
Figure 508695DEST_PATH_IMAGE001
80%, be preferably 75%;
(2), washing and oven dry obtain the powder-mixed presoma;
Carry out the reactant liquor of step (1) gained centrifugal; Centrifugal process control centrifugal rotational speed be 3000
Figure 838046DEST_PATH_IMAGE001
3500r/min; Time be 20
Figure 771367DEST_PATH_IMAGE001
30min; Oven dry after solid content behind gained centrifugal successively respectively washs 3 times with deionized water and absolute ethyl alcohol, the powder-mixed presoma;
The deionized water that wherein each washing is used and the amount of absolute ethyl alcohol are by reactant liquor: the volume ratio of deionized water is 1:50, and by reactant liquor: the volume ratio of absolute ethyl alcohol is 1:1.5;
Wherein bake out temperature be controlled to be 60
Figure 502562DEST_PATH_IMAGE001
90 ℃, be preferably 70 ℃;
(3), with the heat treatment under air atmosphere of powder-mixed presoma, Co 3O 4The nano-sheet material
Is 290 with the powder-mixed presoma of step (2) gained in temperature
Figure 761505DEST_PATH_IMAGE001
Under 310 ℃ of conditions, be preferably 300 ℃ and heat-treat 3h, promptly get a kind of Co 3O 4The nano-sheet material.
A kind of Co 3 O 4 The nano-sheet material
Above-mentioned a kind of Co 3O 4The Co of nano-sheet preparation methods gained 3O 4The nano-sheet material, this material is at 40 and 60 mA g -1Under the different charge-discharge mechanisms, the capability retention behind charge and discharge cycles 30 circles has embodied electrochemical stability and cycle life preferably more than 84%.
A kind of Co 3 O 4 The nano-sheet material is as the application of the negative material of chargeable lithium ion battery
A kind of Co 3O 4The nano-sheet material is used for the chargeable lithium ion battery negative material, i.e. cobaltosic oxide electrode negative material, as be used for lithium hexafluoro phosphate, lithium perchlorate, hexafluoroarsenate lithium and three fluorocarbons sulfonic acid lithium (LiPF 6, LiClO 4, LiAsF 6And CF 3SO 3Li) etc. be in the electrolytical chargeable lithium ion battery.
Above-mentioned a kind of Co 3O 4The conduct of nano-sheet material The negative material of chargeable lithium ion batteryBe the preparation method of cobaltosic oxide electrode negative material, adopt the coating method preparation, its concrete steps are following:
Is cobaltosic oxide nano flaky material, acetylene black and binding agent that polyvinylidene fluoride (PVDF) is the cobaltosic oxide nano flaky material by mass ratio: acetylene black: binding agent is 80:15:5; Nano-sheet material, acetylene black and binding agent are mixed and be dissolved in the N-methyl pyrrolidone (NMP); Be coated on the nickel screen collector of handling (diameter is 11 millimeters); In 100 ℃ in vacuum, baking 12h, the negative material that promptly gets chargeable lithium ion battery is a cobaltosic oxide electrode negative material.
With above-mentioned gained cobaltosic oxide electrode negative material is negative pole, and metal lithium sheet is anodal, and polypropylene (PP) is as the barrier film between the both positive and negative polarity, 1 M LiPF 6And ethylene carbonate (EC) and diethyl carbonate (DEC) mixed liquor of 50:50 (w/w) are electrolyte; In the glove box of argon shield, be assembled into battery, under Land battery test system (the blue electric Electronics Co., Ltd. in Wuhan provides), carry out the constant current charge-discharge test.Voltage range is 0.01 3.0 V Vs.Li/Li +
Beneficial effect of the present invention
The present invention is employed in cobaltosic oxide electrode material building-up process and in presoma, adds surfactant cetyl trimethyl ammonia bromide (CTAB) and the precipitation reagent urea (H that different chemical measures ratio 2NCONH 2), it is fully mixed with presoma, after heat treatment obtain the technical scheme of described electrode material.Adopt urea that OH is provided in this patent Ion.Urea is a kind of alkalescent material, its nontoxic, stable, nonionic, and the compound of good water solubility.In hydrothermal reaction process, urea can slowly release OH Ion promotes Co (II) nucleation, crystallization, deposition.Cetyl trimethyl ammonia bromide (CTAB) serves as soft template as surfactant in course of reaction, be used at absorption and dispersion nucleus.
The Co that adopts the present invention to prepare 3O 4Material has regular nano surface lamellar structure, can guarantee that electrolyte fully permeates on the one hand, and the contact-making surface of increase can provide more electroactive point, guarantees that lithium ion better embeds/deviate from electrochemical behavior; On the other hand, this special construction has increased specific area, has improved the lithium storage capacity.This structure shortens e -And Li +Conducting path, thereby improve multiplying power property.Be that cobalt salt, surfactant, precipitation reagent, water are respectively the Co that the 1:2:3:333.33 hydro thermal method makes in molar ratio 3O 4Electrode material is at 40 and 60 mA
Figure 838549DEST_PATH_IMAGE002
g -1Under the different charge-discharge mechanisms, the capability retention behind charge and discharge cycles 30 circles is more than 84%, embodied preferably all characteristics such as even easy batch process of electrochemical stability and cycle life, nanoparticle size.
Description of drawings
The Co of Fig. 1, embodiment 1 gained 3O 4The SEM figure of material;
The Co of Fig. 2, embodiment 2 gained 3O 4The SEM figure of material;
The Co of Fig. 3, embodiment 3 gained 3O 4The SEM figure of material;
The Co of Fig. 4, embodiment 4 gained 3O 4The SEM figure of material;
The Co of Fig. 5, embodiment 1 gained 3O 4The cycle life figure of material discharge process under the different electric current density;
The Co of Fig. 6, embodiment 2 gained 3O 4The cycle life figure of material discharge process under the different electric current density;
The Co of Fig. 7, embodiment 3 gained 3O 4The cycle life figure of material discharge process under the different electric current density;
The Co of Fig. 8, embodiment 4 gained 3O 4The cycle life figure of material discharge process under the different electric current density;
The Co of Fig. 9, embodiment 1 gained 3O 4The cycle life figure of material charging process under the different electric current density;
The Co of Figure 10, embodiment 2 gained 3O 4The cycle life figure of material charging process under the different electric current density;
The Co of Figure 11, embodiment 3 gained 3O 4The cycle life figure of material charging process under the different electric current density;
The Co of Figure 12, embodiment 4 gained 3O 4The cycle life figure of material charging process under the different electric current density.
Embodiment
Below through embodiment and combine accompanying drawing that the present invention is further set forth, but do not limit the present invention.
Embodiment 1
Get 3.63g cobalt nitrate (Co (NO 3) 2
Figure 2814DEST_PATH_IMAGE002
6H 2O, analyze pure, chemical reagents corporation of traditional Chinese medicines group), 2.25g urea (H 2NCONH 2, analyze pure, Shanghai hundred million chemical reagent Co., Ltds of a specified duration), 9.11g cetyl trimethyl ammonia bromide (CTAB, analyze pure, Shanghai chemical reagents corporation) join in the 60ml deionized water Co (NO wherein 3) 2: CTAB:H 2NCONH 2: the mol ratio of water is 1:2:3:266.67, and whole adition process is carried out under magnetic agitation (81-2 type, Shanghai Si Le Instr Ltd.).After stirring 40min, whole mixed solution is moved in the autoclave (100ml is just believing instrument plant) of inner liner polytetrafluoroethylene, the filling degree is 60%, and (115 ℃) react 17.5h at a certain temperature, and natural cooling gets reactant liquor then;
With above-mentioned reactant liquor centrifugation; The control centrifugal rotational speed is 3300r/min; Time is 20min, and the solid content behind gained centrifugal successively respectively washs 3 times with deionized water and absolute ethyl alcohol, uses 1000ml deionized water and 30ml absolute ethyl alcohol (to analyze pure respectively at every turn; Shanghai development chemical industry one factory), wash back oven dry under 60 ℃ and obtained the powder-mixed presoma;
With the powder-mixed presoma under air atmosphere, 290 ℃ of heat treatment 3h, final Co 3O 4Material.
The Co of gained 3O 4The SEM of material (Leo 1430 VP, German LEO company) figure is as shown in Figure 1, as can be seen from Figure 1 the Co of gained 3O 4Material presents laminated structure, and the granule agglomeration appears in part sheet surface.
Embodiment 2
Get 3.63 g cobalt nitrate (Co (NO 3) 2
Figure 306756DEST_PATH_IMAGE002
6H 2O, analyze pure, chemical reagents corporation of traditional Chinese medicines group), 2.25 g urea (H 2NCONH 2, analyze pure, Shanghai hundred million chemical reagent Co., Ltds of a specified duration), 9.11 g cetyl trimethyl ammonia bromides (CTAB, analyze pure, Shanghai chemical reagents corporation) join in the 75 ml deionized waters Co (NO 3) 2: CTAB:H 2NCONH 2: the mol ratio of water is 1:2:3:333.33, and whole adition process is carried out under magnetic agitation (81-2 type, Shanghai Si Le Instr Ltd.).After stirring 60min, whole mixed solution is moved in the autoclave (100ml is just believing instrument plant) of inner liner polytetrafluoroethylene, the filling degree is 75%, and (120 ℃) react 18h at a certain temperature, and natural cooling gets reactant liquor then.
With above-mentioned reactant liquor centrifugation; The control centrifugal rotational speed is 3500r/min; Time is 30min, and the solid content behind gained centrifugal successively respectively washs 3 times with deionized water and absolute ethyl alcohol, uses 1250ml deionized water and 37.5ml absolute ethyl alcohol (to analyze pure respectively at every turn; Shanghai development chemical industry one factory), under 70 ℃, dry after washing is accomplished and obtain the powder-mixed presoma;
With the powder-mixed presoma under air atmosphere, 300 ℃ of heat treatment 3h, final Co 3O 4Material.
The Co of gained 3O 4The SEM of material (Leo 1430 VP, German LEO company) figure is as shown in Figure 2, as can be seen from Figure 2 the Co of gained 3O 4Material presents laminated structure, and lamella is evenly distributed, and the nanometer lamella is interconnected.
Embodiment 3
Get 3.63 g cobalt nitrate (Co (NO 3) 2
Figure 847459DEST_PATH_IMAGE002
6H 2O, analyze pure, chemical reagents corporation of traditional Chinese medicines group), 2.25 g urea (H 2NCONH 2, analyze pure, Shanghai hundred million chemical reagent Co., Ltds of a specified duration), 9.11 g cetyl trimethyl ammonia bromides (CTAB, analyze pure, Shanghai chemical reagents corporation) join in the 70 ml deionized waters Co (NO 3) 2: CTAB:H 2NCONH 2: the mol ratio of water is 1:2:3:311.12, and whole adition process is carried out under magnetic agitation (81-2 type, Shanghai Si Le Instr Ltd.).After stirring 50min, whole mixed solution is moved in the autoclave (100ml is just believing instrument plant) of inner liner polytetrafluoroethylene, the filling degree is 70%, and (120 ℃) react 18h at a certain temperature, and natural cooling gets reactant liquor then;
With above-mentioned reactant liquor centrifugation; The control centrifugal rotational speed is 3500r/min; Time is 25min, and the solid content behind gained centrifugal successively respectively washs 3 times with deionized water and absolute ethyl alcohol, uses 1166.7ml deionized water and 35ml absolute ethyl alcohol (to analyze pure respectively at every turn; Shanghai development chemical industry one factory), under 80 ℃, dry after washing is accomplished and obtain the powder-mixed presoma;
With the powder-mixed presoma under air atmosphere, 300 ℃ of heat treatment 3h, final Co 3O 4Material.
The Co of gained 3O 4The SEM of material (Leo 1430 VP, German LEO company) figure is as shown in Figure 3, as can be seen from Figure 3 the Co of gained 3O 4Material presents laminated structure, and the granule agglomeration appears in part sheet surface.
Embodiment 4
Get 3.63 g cobalt nitrate (Co (NO 3) 2
Figure 225351DEST_PATH_IMAGE002
6H 2O, analyze pure, chemical reagents corporation of traditional Chinese medicines group), 2.25 g urea (H 2NCONH 2, analyze pure, Shanghai hundred million chemical reagent Co., Ltds of a specified duration), 9.11 g cetyl trimethyl ammonia bromides (CTAB, analyze pure, Shanghai chemical reagents corporation) join in the 80 ml deionized waters Co (NO 3) 2: CTAB:H 2NCONH 2: the mol ratio of water is 1:2:3:355.56, and whole adition process is carried out under magnetic agitation (81-2 type, Shanghai Si Le Instr Ltd.).After stirring 45min, whole mixed solution is moved in the autoclave (100ml is just believing instrument plant) of inner liner polytetrafluoroethylene, the filling degree is 80%, and (125 ℃) react 18.5h at a certain temperature, and natural cooling gets reactant liquor then;
With above-mentioned reactant liquor centrifugation; The control centrifugal rotational speed is 3000r/min; Time is 20min, and the solid content behind gained centrifugal successively respectively washs 3 times with deionized water and absolute ethyl alcohol, uses 1333.3ml deionized water and 40ml absolute ethyl alcohol (to analyze pure respectively at every turn; Shanghai development chemical industry one factory), under 90 ℃, dry after washing is accomplished and obtain the powder-mixed presoma;
With the powder-mixed presoma under air atmosphere, 310 ℃ of heat treatment 3h, final Co 3O 4Material.
The Co of gained 3O 4The SEM of material (Leo 1430 VP, German LEO company) figure is as shown in Figure 4, as can be seen from Figure 4 the Co of gained 3O 4Material presents laminated structure, and the granule agglomeration appears in part sheet surface.
Application implementation example 1
The preparation of cobaltosic oxide electrode negative material, step is following:
By quality than cobaltosic oxide material: acetylene black (LITHIUM BATTERY; Xiang Tan Battery Plant): binding agent (polyvinylidene fluoride (PVDF); Analyze pure; Chemical reagents corporation of traditional Chinese medicines group)=80:15:5; Respectively that embodiment 1
Figure 888413DEST_PATH_IMAGE001
4 is prepared cobaltosic oxide material and acetylene black and binding agent mixes and be dissolved in respectively in the N-methyl pyrrolidone (Shanghai chemical reagent purchase and supply does not have the couplet chemical plant for NMP, chemical pure); Be coated in and (analyze pure through acetone; Shanghai development chemical industry one factory) on the nickel screen collector (11 millimeters of diameters, Beijing Non-Fervoous Metal Inst.) that ultrasonic 10min and 100 ℃ of dried are crossed, coating thickness is 0.2mm; In 100 ℃ in vacuum, baking 12h, obtain the corresponding cobaltosic oxide electrode negative material of processing by embodiment 1～4 prepared cobaltosic oxide material.
Cobaltosic oxide electrode negative material with above-mentioned gained is a negative pole respectively, and metal lithium sheet (Beijing Non-Fervoous Metal Inst. (purity 99.9%)) is anodal, and polypropylene (PP, technical grade, Oil of Shanghai Petrochemical Company Company products) is as the barrier film between the both positive and negative polarity, 1 M LiPF 6And ethylene carbonate (EC) and diethyl carbonate (DEC) mixed liquor of 50:50 (w/w) are electrolyte (Guotai Huarong Chemical New Material Co., Ltd., Zhangjiagang City); Glove box (ZKX type in argon shield; Nanjing Univ. Instrument Factory) lining is assembled into battery, under Land battery test system (the blue electric Electronics Co., Ltd. in Wuhan provides), carries out constant current charge and discharge test.Voltage range is 0.01 3.0 V Vs.Li/Li +Current density is 20,40,60 and 80mA
Figure 696149DEST_PATH_IMAGE002
g -1Test environment is 25 ℃ of constant temperature.Experimental data is like Fig. 5
Figure 274022DEST_PATH_IMAGE001
shown in 12.
From Fig. 5～12, can find out, 20,40 and 60mA
Figure 780089DEST_PATH_IMAGE002
g -1Under the different charge-discharge mechanisms, embodiment 1,2,3 and embodiment 4 have electrochemical behavior preferably, particularly the prepared Co of embodiment 2 3O 4Capability retention behind material charge and discharge cycles 30 circles has embodied best electrochemical stability and cycle life more than 88%.
Foregoing is merely the basic explanation of the present invention under conceiving, and according to any equivalent transformation that technical scheme of the present invention is done, all should belong to protection scope of the present invention.

Claims (6)

1. Co 3O 4The nano-sheet preparation methods is characterized in that comprising the steps:
(1), with cobalt salt, surfactant, precipitation reagent mix with water the back stir 30
Figure 482401DEST_PATH_IMAGE001
60min; Carry out hydro-thermal reaction in the autoclave with whole mixed solution immigration inner liner polytetrafluoroethylene; The control hydrothermal temperature be 115
Figure 792159DEST_PATH_IMAGE001
125 ℃; Time be 17.5 18.5h, reactant liquor;
Wherein said cobalt salt is cobalt nitrate, cobalt acetate, cobalt carbonate or cobalt oxalate;
Said surfactant is the cetyl trimethyl ammonia bromide;
Described precipitation reagent is a urea;
Wherein the mixing ratio of cobalt salt, surfactant, precipitation reagent and water is calculated in molar ratio, i.e. cobalt salt: surfactant: precipitation reagent: water is 1:2:3:266.67 355.56;
(2), washing and oven dry obtain the powder-mixed presoma;
Carry out the reactant liquor of step (1) gained centrifugal; Centrifugal process control centrifugal rotational speed be 3000
Figure 880704DEST_PATH_IMAGE001
3500r/min; Time be 20
Figure 361364DEST_PATH_IMAGE001
30min; After solid content behind gained centrifugal respectively washs 3 times with deionized water and absolute ethyl alcohol; The control temperature be 60
Figure 653805DEST_PATH_IMAGE001
90 ℃ of oven dry, the powder-mixed presoma;
The deionized water that wherein each washing is used and the amount of absolute ethyl alcohol are by reactant liquor: the volume ratio of deionized water is 1:50, and by reactant liquor: the volume ratio of absolute ethyl alcohol is 1:1.5;
(3), with the heat treatment under air atmosphere of powder-mixed presoma, Co 3O 4The nano-sheet material
Is 290 with the powder-mixed presoma of step (2) gained in temperature
Figure 573219DEST_PATH_IMAGE001
Heat treatment 3h under 310 ℃ of conditions promptly gets a kind of Co 3O 4The nano-sheet material.
2. a kind of Co as claimed in claim 1 3O 4The nano-sheet preparation methods is characterized in that:
The mixing ratio of cobalt salt, surfactant, precipitation reagent and water in the step (1) is calculated in molar ratio, i.e. cobalt salt: surfactant: precipitation reagent: water is preferably 1:2:3:333.33.
3. according to claim 1 or claim 2 a kind of Co 3O 4The nano-sheet preparation methods is characterized in that: the filling degree of step (1) mesohigh agitated reactor is 60
Figure 267506DEST_PATH_IMAGE001
80%, hydrothermal temperature is preferably 120 ℃, and the hydro-thermal reaction time is preferably 18h;
Bake out temperature control in the step (2) is preferably 70 ℃;
Heat treatment temperature in the step (3) is preferably 300 ℃.
4. a kind of Co as claimed in claim 3 3O 4The nano-sheet preparation methods is characterized in that the filling degree of step (1) mesohigh agitated reactor is preferably 75%.
5. according to claim 1 or claim 2 a kind of Co 3O 4The Co of nano-sheet preparation methods gained 3O 4The negative material that the nano-sheet material is used for chargeable lithium ion battery is a cobaltosic oxide electrode negative material.
6. a kind of Co as claimed in claim 5 3O 4The negative material that the nano-sheet material is used for chargeable lithium ion battery is the preparation method of cobaltosic oxide electrode negative material, it is characterized in that step is following:
Is cobaltosic oxide nano flaky material, acetylene black and binding agent the cobaltosic oxide nano flaky material by mass ratio: acetylene black: binding agent is 80:15:5; Nano-sheet material, acetylene black and binding agent are mixed and be dissolved in the N-methyl pyrrolidone; Be coated on the nickel screen collector of handling; In 100 ℃ in vacuum, baking 12h, promptly get cobaltosic oxide electrode negative material;
Described binding agent is a polyvinylidene fluoride.
CN2011103197910A 2011-10-20 2011-10-20 Co3O4 nano lamellar material and preparation method and application thereof Pending CN102412397A (en)

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CN111334818A (en) * 2020-02-28 2020-06-26 浙江糖能科技有限公司 Device for electrolytic catalytic oxidation and method for preparing 2, 5-furandicarboxylic acid
CN113437307A (en) * 2021-06-25 2021-09-24 上海理工大学 Preparation method of cobaltosic oxide and carbon quantum dot composite material

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