CN108862403A - A kind of preparation method and applications of cobalt acid zinc nanometer sheet material - Google Patents
A kind of preparation method and applications of cobalt acid zinc nanometer sheet material Download PDFInfo
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Abstract
The present invention relates to a kind of preparation method and applications of cobalt acid zinc nanometer sheet material, preparation method is：Zinc source and cobalt source are dissolved in deionized water, 8-hydroxyquinoline is dissolved in dehydrated alcohol, then two solution are mixed and stirred for, is transferred to after mixing in reaction kettle and carries out hydro-thermal reaction, is centrifugally separating to obtain solid after cooled to room temperature；Obtained solid is subjected to high-temperature calcination, arrives cobalt acid zinc nanometer sheet material after cooled to room temperature.The present invention is compared compared to the specific capacity of other cathode energy storage materials, is had biggish specific surface area, is provided simultaneously with excellent charging and discharging capacity and good high rate performance, preparation method is simple, it is low in cost, it has excellent performance, the production suitable for large-scale commercial applications battery.
Description
Technical field
The present invention relates to a kind of battery materials, and in particular to a kind of preparation method of cobalt acid zinc nanometer sheet material and its answers
With.
Background technique
In recent years, since lithium ion battery has many advantages, such as high-energy density, long circulation life and good stability, lithium
Ion battery is widely applied in smart phone, laptop, electric car, the fields such as hybrid vehicle.However,
As traditional negative electrode material --- the graphite of lithium ion battery, from low capacity (the 372mAh g of graphite-1) and limited multiplying power appearance
From the point of view of amount, graphite is difficult to meet the requirement of high-energy/power density and safety.Although since silicon substrate and tin-based material can be with
Show high theoretical capacity and low discharge potential, potential application more better than graphite, but silicon substrate and tin-based material
Using nevertheless suffering from very various limitations, including low conductivity and apparent volume expansion.Therefore, for high-performance lithium ion
For battery, the new material of developing low-cost, high capacity, good cycling stability is extremely important.
In addition, the transition metal oxide using nanostructure as negative electrode material is due to its theoretical capacity height, at low cost, peace
Quan Xinggao and be concerned.In the past few years, transition metal oxide such as MnO, ZnO, Fe3O4And Co3O4Deng extensive
Research is used as lithium ion battery negative material.However, in the transition metal oxide of a large amount of lithium ion battery negative material,
Co3O4Show more excellent lithium storage content (890mAh g-1).However, due to Co3O4Toxicity and expensive cost, it is not
It is the ideal negative electrode material of lithium ion battery.To solve this problem, people with cheap and asepsis environment-protecting metal such as Zn, Fe and
Ni substitutes Co3O4In a Co atom be a kind of effective method.
So far, more and more researchers begin to focus on Co base transiton metal binary oxides, because of Co base two
The shortcomings that element/transition metal oxide can overcome common metal oxides as the electrode material of lithium ion battery, and optimize
Two kinds of function metals have better chemical property and mechanical stability.Up to the present, many that there are different nanostructures
Cobalt acid Zinc material be applied to lithium ion battery.But traditional cobalt acid zinc is not very as the reversible capacity of negative electrode material
Height, although having paid huge effort in recent years, the cobalt acid zinc for having high reversible specific capacity using easy method preparation is
It is extremely important and full of challenge.
Summary of the invention
The purpose of the present invention is to solve the above-mentioned problems and provide cobalt acid zinc nanometer sheet material preparation method and its
Using.
The purpose of the present invention is achieved through the following technical solutions：
A kind of preparation method of cobalt acid zinc nanometer sheet material, specifically comprises the following steps：
(1) zinc source and cobalt source are dissolved in deionized water, 8-hydroxyquinoline is dissolved in dehydrated alcohol, then by two solution
It is mixed and stirred for, is transferred to after mixing in reaction kettle and carries out hydro-thermal reaction, be centrifugally separating to obtain solid after cooled to room temperature；
(2) obtained solid is subjected to high-temperature calcination, arrives cobalt acid zinc nanometer sheet material after cooled to room temperature.
Further, step (1) the zinc source is zinc nitrate, and the cobalt source is cobalt nitrate.
Further, the molar ratio of step (1) the zinc source and cobalt source is 1：2, the dosage and cobalt of the 8-hydroxyquinoline
The molar ratio in source is 13-15:1.
Further, the temperature of step (1) described hydro-thermal reaction is 170-190 DEG C, and the reaction time is temperature 8-10 hours.
Further, step (2) high-temperature calcination carries out in tube furnace air atmosphere, is heated up with the speed of 1-2 DEG C/min
To 550-650 DEG C heat preservation 1.5-2.5 hours.
Obtained ZnCo-8- oxyquinoline is precursor-derived from before metal organic framework compound, ZnCo-8- oxyquinoline
Body is also sheet layer material, and cobalt acid zinc nanoscale twins material has typical meso-hole structure and average pore size is in 3nm or so.
It is applied in lithium ion battery using high circulation performance cobalt acid zinc nanometer sheet material prepared by the above method.Cobalt acid zinc
Nanometer sheet has typical meso-hole structure and average pore size is in 3nm or so, and meso-hole structure helps to alleviate in charge and discharge cycles mistake
Volume expansion in journey, while meso-hole structure facilitates electrolyte permeability to the inside of material, so that increasing final electrode material
Lithium storage content, the cobalt acid zinc nanometer sheet of the negative electrode material as lithium ion battery shows height ratio capacity and excellent circulation
Stability.
For the present invention by the way that ZnCo-8- oxyquinoline precursor is made derived from metal organic framework compound, it is by metal
Ion or metal cluster have many advantages, such as duct and function adjustability in a kind of compound that organic ligand combines.By in air
In direct pyrogenic metal organic backbone (MOFs), develop a kind of simple and route of low price to synthesize comprising many crystal grain as lithium
The cobalt acid zinc nanometer sheet of ion battery cathode material, using 8-hydroxyquinoline as organic ligand and configuration metal ions Zn2+And Co2+
Complexing occurs and forms MOFs, then carries out high temperature pyrolysis processing etc. and obtains the cobalt acid zinc of stratiform, it is obtained in carbonisation
Cobalt acid zinc precursor can be converted into the nanometer sheet being made of crystal grain, and therefore, the cobalt acid zinc of synthesis can promote lithium ion and electronics
Quick transmission, and big volume change can be buffered in charge/discharge process.Importantly, as lithium-ion electric
The cobalt acid zinc nanometer sheet of the negative electrode material in pond shows height ratio capacity and excellent cyclical stability.Cobalt acid produced by the present invention
Zinc nanometer sheet shape characteristic keeps preferably and has specific surface area abundant, can increase the contact area with electrolyte, promotes
The diffusion and electron transition of Li+ ion, when the negative electrode material as lithium ion battery is tested, prepared cobalt acid zinc table
Reveal reversible height ratio capacity, excellent rate capability and cyclical stability.
The specific forming process of cobalt acid zinc nanometer sheet is substantially as follows：
(1) it first passes through 8-hydroxyquinoline and reacts synthesis ZnCo-8- hydroxyl quinoline under hydrothermal conditions with divalent Co and Zn ion
Then quinoline precursor obtains cobalt acid zinc nanometer sheet by pyrolysis ZnCo-8- oxyquinoline in air；
(2) since, there are the pi-conjugated effect of strong π-, precursor shows the uniform form of sheet material, thereafter at 600 DEG C in precursor
After calcining 2 hours, prepared precursor can change slabbing cobalt acid zinc, pi-pi bond fracture, it can be seen that sheet cobalt acid zinc is by being permitted
Donna rice grain composition；
(3) in this sheet cobalt acid zinc, nano particle can not only provide big electrode electrolyte interface contact surface
Product, and more active sites are provided for Li+ insertion and embedding reaction out, and sheet cobalt acid zinc can reduce Li+ and electronics
Diffusion length；
(4) meso-hole structure of cobalt acid zinc nanometer sheet helps to buffer the volume expansion in charge/discharge process, in addition, electric
This meso-hole structure of pole material completely penetrates the inside in hole for electrolyte and is efficiently diffused into less resistive
Active site be useful, finally, with large specific surface area electrode material can for lithium ion insertion and it is embedding go out provide more
More active sites.
Cobalt acid zinc nanometer sheet material prepared by the present invention for lithium ion battery shows excellent chemical property,
Cobalt acid zinc nanometer sheet obtained is after 50 circulations with 100mA g-1Current density provide 1640.8mAh g-1Height it is reversible
Capacity, it is often more important that, even if in 1500mA g-1Current density under, 190 times circulation rear electrode material discharge capacity still
For 581.3mAh g-1, show that cobalt acid zinc nanometer sheet has very big potentiality as the negative electrode material of lithium ion battery.
Compared with prior art, cobalt acid zinc flaky nanometer structure prepared by the present invention has biggish specific surface area, can be with
Increase the contact area with electrolyte, promotes Li+The diffusion and electron transition of ion, when the negative electrode material as lithium ion battery
When being tested, prepared cobalt acid zinc shows reversible height ratio capacity, excellent rate capability and cyclical stability, specifically
Advantage is：
(1) the unique electrode material being made of many crystal grain has biggish specific surface area；
(2) huge specific surface area is conducive to increase the contact area with electrolyte, makes full use of the active material on electrode
Material, allows lithium ion to enter sufficiently into the inside of material in charge and discharge process；
(3) unique structure can also effectively inhibit the variation of the volume expansion in electrode material charge and discharge process, prevent
Reunite；
(4) reduce electrode material polarization and the internal resistance of cell, promote the cyclical stability and high rate performance of material；
(5) method of materials synthesis is simple, step is few, facilitate operation, is cheap, nonhazardous is easy to heavy industrialization
Production.
Detailed description of the invention
Fig. 1 is the flow diagram of 1 gained cobalt acid zinc Nano sheet material preparation method for material of embodiment；
Fig. 2 is the scanning electron microscope image of 1 gained cobalt acid zinc nanometer sheet material of embodiment；
Fig. 3 is the scanning electron high resolution microscope image of 1 gained cobalt acid zinc nanometer sheet material of embodiment；
Fig. 4 is the cyclic voltammetry curve of the resulting cobalt acid zinc nanometer sheet material of embodiment 1；
Fig. 5 is the charging and discharging curve of the resulting cobalt acid zinc nanometer sheet material of embodiment 1；
Fig. 6 is the cycle performance curve of the resulting cobalt acid zinc nanometer sheet material of embodiment 1；
Fig. 7 is the multiplying power test curve of the resulting cobalt acid zinc nanometer sheet material of embodiment 1；
Fig. 8 is the Electrochemical Characterization of the resulting cobalt acid zinc nanometer sheet material of embodiment 1.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
The chemical property of cobalt acid zinc nanometer sheet material obtained in the embodiment of the present invention derived from metal organic framework
It is tested by electrochemical workstation and blue electrical measurement test system；Electrochemical workstation used is occasion China electrochemical workstation；
Blue electrical measurement test system uses LAND-CT2001.Electrochemical property test is tested using 2032 type button cells, and button cell is filling
It is assembled in the glove box of full argon gas, the content value of water and the content value of oxygen are held at 0.1ppm or less in glove box.
Embodiment 1
A kind of preparation method of the cobalt acid zinc nanometer sheet material derived from metal organic framework, process is as shown in Figure 1, include
Following below scheme：a)Zn2+、Co2+ZnCo-8- oxyquinoline precursor, b are formed with oxyquinoline is coordinated) ZnCo-8- oxyquinoline
Precursor Pintsch process forms cobalt acid zinc nanometer sheet.
Specifically include following steps：
(1) prepare cobalt acid zinc nanometer sheet persursor material the step of；First weigh the zinc nitrate and 1mmol of 0.5mmol
Cobalt nitrate is dissolved in deionized water for solution A, after weigh the 8-hydroxyquinoline of 1.98g again and be dissolved in dehydrated alcohol as solution B,
B solution is finally slowly dropped into solution A and is stirred, mixed solution is transferred to polytetrafluoroethyllining lining reaction kettle after completion of dropwise addition
In, then under 180 DEG C of reaction conditions 9 hours are kept the temperature, solid is centrifugally separating to obtain after natural cooling cooling.
(2) prepare cobalt acid zinc nanometer sheet the step of；Obtained ZnCo-8- oxyquinoline precursor solid is placed in pipe
600 DEG C are warming up to the speed of 2 DEG C/min in air in formula furnace and keeps the temperature 2 hours, and then natural cooling can be obtained by nanometer
The cobalt acid zinc nanometer sheet of particle composition.
(3) the cobalt acid zinc nanometer sheet that will be obtained, by ground sample (milling time 30 minutes), coated sample, assembling electricity
Pond obtains high circulation, powerful cobalt acid zinc nanometer sheet electrode material.
(4) after obtaining sample, it is made into the slurry containing conductive agent, bonding agent and organic solvent.Conductive agent
For acetylene black, bonding agent is Kynoar PVDF, and organic solvent is N methyl pyrrolidone NMP, and slurry is then coated on copper
On foil collector, battery is then assembled into glove box.Finally by assembled battery in blue electrical measurement test system and electrochemistry
Work station carries out electro-chemical test and sample is carried out otherwise physical characterization etc..
Transmission electron microscope characterization is carried out to the active material, Fig. 2 is the scanning electron microscope image of cobalt acid zinc nanometer sheet, figure
3 be the scanning electron high resolution microscope image of sour zinc nanometer sheet；Fig. 4-7 is resulting cobalt acid zinc nanometer sheet cell negative electrode material
Electrochemical Characterization, wherein Fig. 4 be cobalt acid zinc in voltage range 0.01-3V, to sweep speed be 0.1mV s-1It is preceding three times
Cyclic voltammogram；It in current density is 100mA g that Fig. 5, which is cobalt acid zinc,-1Charging and discharging curve；Fig. 6 is cobalt acid zinc in current density
For 100mA g-1Under cycle performance, Fig. 7 be cobalt acid zinc under different current densities multiplying power test.Fig. 8 is resulting cobalt
The Electrochemical Characterization of sour zinc nanometer sheet cell negative electrode material：Negative electrode of lithium ion battery cycle performance, the circulation indicated in figure
Performance, abscissa are circulating ring number, and ordinate is the capacity reached.Electrode material is shown with certain cycle performance.
Embodiment 2
A kind of preparation method of the cobalt acid zinc nanometer sheet material derived from metal organic framework, specifically includes following steps：
(1) prepare cobalt acid zinc nanometer sheet persursor material the step of；First weigh the zinc nitrate and 1mmol of 0.5mmol
Cobalt nitrate is dissolved in deionized water for solution A, after weigh the 8-hydroxyquinoline of 1.98g again and be dissolved in dehydrated alcohol as solution B,
B solution is finally slowly dropped into solution A and is stirred, mixed solution is transferred to polytetrafluoroethyllining lining reaction kettle after completion of dropwise addition
In, then under 170 DEG C of reaction conditions 10 hours are kept the temperature, solid is centrifugally separating to obtain after natural cooling cooling.
(2) prepare cobalt acid zinc nanometer sheet the step of；Obtained ZnCo-8- oxyquinoline precursor solid is placed in pipe
550 DEG C are warming up to the speed of 2 DEG C/min in air in formula furnace and keeps the temperature 2.5 hours, and then natural cooling can be obtained by receiving
The cobalt acid zinc nanometer sheet of rice grain composition.
(3) the cobalt acid zinc nanometer sheet that will be obtained, by ground sample, coated sample, assembled battery obtain high circulation, high power
The cobalt acid zinc nanometer sheet material of rate.
(4) after obtaining sample, it is made into the slurry containing conductive agent, bonding agent and organic solvent.Conductive agent
For acetylene black, bonding agent is Kynoar PVDF, and organic solvent is N methyl pyrrolidone NMP, and slurry is then coated on copper
On foil collector, battery is then assembled into glove box.Finally by assembled battery in blue electrical measurement test system and electrochemistry
Work station carries out electro-chemical test and sample is carried out otherwise physical characterization etc..
Embodiment 3
A kind of preparation method of the cobalt acid zinc nanometer sheet material derived from metal organic framework.Experiment flow is shown in Fig. 1, specifically
Include the following steps：
(1) prepare cobalt acid zinc nanometer sheet persursor material the step of；First weigh the zinc nitrate and 2mmol nitre of 1mmol
Sour cobalt is dissolved in deionized water for solution A, after weigh the 8-hydroxyquinoline of 3.96g again and be dissolved in dehydrated alcohol as solution B, most
B solution is slowly dropped into solution A afterwards and is stirred, mixed solution is transferred in polytetrafluoroethyllining lining reaction kettle after completion of dropwise addition,
8 hours are kept the temperature under 190 DEG C of reaction conditions again, is centrifugally separating to obtain solid after natural cooling cooling.
(2) prepare cobalt acid zinc nanometer sheet the step of；Obtained ZnCo-8- oxyquinoline precursor solid is placed in pipe
650 DEG C are warming up to the speed of 2 DEG C/min in air in formula furnace and keeps the temperature 1.5 hours, and then natural cooling can be obtained by receiving
The cobalt acid zinc nanometer sheet of rice grain composition.
(3) the cobalt acid zinc nanometer sheet that will be obtained, by ground sample, coated sample, assembled battery obtain high circulation, high power
The cobalt acid zinc nanometer sheet material of rate.
(4) after obtaining sample, it is made into the slurry containing conductive agent, bonding agent and organic solvent.Conductive agent
For acetylene black, bonding agent is Kynoar PVDF, and organic solvent is N methyl pyrrolidone NMP, and slurry is then coated on copper
On foil collector, battery is then assembled into glove box.Finally by assembled battery in blue electrical measurement test system and electrochemistry
Work station carries out electro-chemical test and sample is carried out otherwise physical characterization etc..
Embodiment 4
A kind of preparation method of the cobalt acid zinc nanometer sheet material derived from metal organic framework.Experiment flow is shown in Fig. 1, specifically
Include the following steps：
(1) prepare cobalt acid zinc nanometer sheet persursor material the step of；First weigh the zinc nitrate and 1mmol of 0.5mmol
Cobalt nitrate is dissolved in deionized water for solution A, after weigh the 8-hydroxyquinoline of 1.98g again and be dissolved in dehydrated alcohol as solution B,
B solution is finally slowly dropped into solution A and is stirred, mixed solution is transferred to polytetrafluoroethyllining lining reaction kettle after completion of dropwise addition
In, then under 185 DEG C of reaction conditions 9.5 hours are kept the temperature, solid is centrifugally separating to obtain after natural cooling cooling.
(2) prepare cobalt acid zinc nanometer sheet the step of；Obtained ZnCo-8- oxyquinoline precursor solid is placed in pipe
600 DEG C are warming up to the speed of 1 DEG C/min in air in formula furnace and keeps the temperature 2 hours, and then natural cooling can be obtained by nanometer
The cobalt acid zinc nanometer sheet of particle composition.
(3) the cobalt acid zinc nanometer sheet that will be obtained, by ground sample, coated sample, assembled battery obtain high circulation, high power
The cobalt acid zinc nanometer sheet material of rate.
(4) after obtaining sample, it is made into the slurry containing conductive agent, bonding agent and organic solvent.Conductive agent
For acetylene black, bonding agent is Kynoar PVDF, and organic solvent is N methyl pyrrolidone NMP, and slurry is then coated on copper
On foil collector, battery is then assembled into glove box.Finally by assembled battery in blue electrical measurement test system and electrochemistry
Work station carries out electro-chemical test and sample is carried out otherwise physical characterization etc..
Embodiment 5
A kind of preparation method of the cobalt acid zinc nanometer sheet material derived from metal organic framework.Experiment flow is shown in Fig. 1, specifically
Include the following steps：
(1) prepare cobalt acid zinc nanometer sheet persursor material the step of；First weigh the zinc nitrate and 2mmol nitre of 1mmol
Sour cobalt is dissolved in deionized water for solution A, after weigh the 8-hydroxyquinoline of 3.96g again and be dissolved in dehydrated alcohol as solution B, most
B solution is slowly dropped into solution A afterwards and is stirred, mixed solution is transferred in polytetrafluoroethyllining lining reaction kettle after completion of dropwise addition,
10 hours are kept the temperature under 170 DEG C of reaction conditions again, is centrifugally separating to obtain solid after natural cooling cooling.
(2) prepare cobalt acid zinc nanometer sheet the step of；Obtained ZnCo-8- oxyquinoline precursor solid is placed in pipe
650 DEG C are warming up to the speed of 1 DEG C/min in air in formula furnace and keeps the temperature 2 hours, and then natural cooling can be obtained by nanometer
The cobalt acid zinc nanometer sheet of particle composition.
(3) the cobalt acid zinc nanometer sheet that will be obtained, by ground sample, coated sample, assembled battery obtain high circulation, high power
The cobalt acid zinc nanometer sheet material of rate.
(4) after obtaining sample, it is made into the slurry containing conductive agent, bonding agent and organic solvent.Conductive agent
For acetylene black, bonding agent is Kynoar PVDF, and organic solvent is N methyl pyrrolidone NMP, and slurry is then coated on copper
On foil collector, battery is then assembled into glove box.Finally by assembled battery in blue electrical measurement test system and electrochemistry
Work station carries out electro-chemical test and sample is carried out otherwise physical characterization etc..
Embodiment 6
A kind of preparation method of the cobalt acid zinc nanometer sheet material derived from metal organic framework.Experiment flow is shown in Fig. 1, specifically
Include the following steps：
(1) prepare cobalt acid zinc nanometer sheet persursor material the step of；First weigh the zinc nitrate and 2mmol nitre of 1mmol
Sour cobalt is dissolved in deionized water for solution A, after weigh the 8-hydroxyquinoline of 3.96g again and be dissolved in dehydrated alcohol as solution B, most
B solution is slowly dropped into solution A afterwards and is stirred, mixed solution is transferred in polytetrafluoroethyllining lining reaction kettle after completion of dropwise addition,
9 hours are kept the temperature under 180 DEG C of reaction conditions again, is centrifugally separating to obtain solid after natural cooling cooling.
(2) prepare cobalt acid zinc nanometer sheet the step of；Obtained ZnCo-8- oxyquinoline precursor solid is placed in pipe
650 DEG C are warming up to the speed of 1 DEG C/min in air in formula furnace and keeps the temperature 1.5 hours, and then natural cooling can be obtained by receiving
The cobalt acid zinc nanometer sheet of rice grain composition.
(3) the cobalt acid zinc nanometer sheet that will be obtained, by ground sample, coated sample, assembled battery obtain high circulation, high power
The cobalt acid zinc nanometer sheet material of rate.
(4) after obtaining sample, it is made into the slurry containing conductive agent, bonding agent and organic solvent.Conductive agent
For acetylene black, bonding agent is Kynoar PVDF, and organic solvent is N methyl pyrrolidone NMP, and slurry is then coated on copper
On foil collector, battery is then assembled into glove box.Finally by assembled battery in blue electrical measurement test system and electrochemistry
Work station carries out electro-chemical test and sample is carried out otherwise physical characterization etc..
Embodiment 7
A kind of preparation method of the cobalt acid zinc nanometer sheet material derived from metal organic framework.Experiment flow is shown in Fig. 1, specifically
Include the following steps：
(1) prepare cobalt acid zinc nanometer sheet persursor material the step of；First weigh the zinc nitrate and 2mmol nitre of 1mmol
Sour cobalt is dissolved in deionized water for solution A, after weigh the 8-hydroxyquinoline of 3.96g again and be dissolved in dehydrated alcohol as solution B, most
B solution is slowly dropped into solution A afterwards and is stirred, mixed solution is transferred in polytetrafluoroethyllining lining reaction kettle after completion of dropwise addition,
9 hours are kept the temperature under 180 DEG C of reaction conditions again, is centrifugally separating to obtain solid after natural cooling cooling.
(2) prepare cobalt acid zinc nanometer sheet the step of；Obtained ZnCo-8- oxyquinoline precursor solid is placed in pipe
550 DEG C are warming up to the speed of 1 DEG C/min in air in formula furnace and keeps the temperature 2.5 hours, and then natural cooling can be obtained by receiving
The cobalt acid zinc nanometer sheet of rice grain composition.
(3) the cobalt acid zinc nanometer sheet that will be obtained, by ground sample, coated sample, assembled battery obtain high circulation, high power
The cobalt acid zinc nanometer sheet material of rate.
(4) after obtaining sample, it is made into the slurry containing conductive agent, bonding agent and organic solvent.Conductive agent
For acetylene black, bonding agent is Kynoar PVDF, and organic solvent is N methyl pyrrolidone NMP, and slurry is then coated on copper
On foil collector, battery is then assembled into glove box.Finally by assembled battery in blue electrical measurement test system and electrochemistry
Work station carries out electro-chemical test and sample is carried out otherwise physical characterization etc..
The present invention is a kind of lithium ion battery negative material with overstable cycle performance, by electrochemical workstation and
Its chemical property of blue electrical testing, electrochemical property test are tested using 2032 type button cells, and button cell is being full of argon gas
Glove box in assemble, the content value of water and the content value of oxygen are held at 0.1ppm or less in glove box.
Claims (6)
1. a kind of preparation method of cobalt acid zinc nanometer sheet material, which is characterized in that specifically comprise the following steps：
(1) zinc source and cobalt source are dissolved in deionized water, 8-hydroxyquinoline is dissolved in dehydrated alcohol, then two solution are mixed
And stir, it is transferred to after mixing in reaction kettle and carries out hydro-thermal reaction, be centrifugally separating to obtain solid after cooled to room temperature；
(2) obtained solid is subjected to high-temperature calcination, arrives cobalt acid zinc nanometer sheet material after cooled to room temperature.
2. a kind of preparation method of cobalt acid zinc nanometer sheet material according to claim 1, which is characterized in that step (1) institute
Stating zinc source is zinc nitrate, and the cobalt source is cobalt nitrate.
3. a kind of preparation method of cobalt acid zinc nanometer sheet material according to claim 1, which is characterized in that step (1) institute
The molar ratio for stating zinc source and cobalt source is 1：2, the dosage of the 8-hydroxyquinoline and the molar ratio of cobalt source are 13-15:1.
4. a kind of preparation method of cobalt acid zinc nanometer sheet material according to claim 1, which is characterized in that step (1) institute
The temperature for stating hydro-thermal reaction is 170-190 DEG C, and the reaction time is temperature 8-10 hours.
5. a kind of preparation method of cobalt acid zinc nanometer sheet material according to claim 1, which is characterized in that step (2) is high
Temperature calcining carries out in tube furnace air atmosphere, is warming up to 550-650 DEG C of heat preservation 1.5-2.5 hours with the speed of 1-2 DEG C/min.
6. a kind of application for the cobalt acid zinc nanometer sheet material being prepared using preparation method as described in claim 1, special
Sign is that the cobalt acid zinc nanometer sheet material is as lithium ion battery negative material.
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| CN115498175A (en) * | 2022-09-20 | 2022-12-20 | 中国石油大学(华东) | High-reversible dendrite-free zinc-poor negative electrode based on ZnCo ZIF derived carbon |
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