LU500937B1 - Micro-spherical zinc vanadate as well as preparation method and use thereof - Google Patents
Micro-spherical zinc vanadate as well as preparation method and use thereof Download PDFInfo
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- LU500937B1 LU500937B1 LU500937A LU500937A LU500937B1 LU 500937 B1 LU500937 B1 LU 500937B1 LU 500937 A LU500937 A LU 500937A LU 500937 A LU500937 A LU 500937A LU 500937 B1 LU500937 B1 LU 500937B1
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- vanadate
- zinc vanadate
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- 239000011701 zinc Substances 0.000 title claims abstract description 62
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 61
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 60
- LSGOVYNHVSXFFJ-UHFFFAOYSA-N vanadate(3-) Chemical compound [O-][V]([O-])([O-])=O LSGOVYNHVSXFFJ-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 30
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000011259 mixed solution Substances 0.000 claims abstract description 12
- 238000001035 drying Methods 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 10
- ALTWGIIQPLQAAM-UHFFFAOYSA-N metavanadate Chemical compound [O-][V](=O)=O ALTWGIIQPLQAAM-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000001354 calcination Methods 0.000 claims abstract description 4
- 239000000126 substance Substances 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 17
- 229910001416 lithium ion Inorganic materials 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 14
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 229910007383 Zn2V2O7 Inorganic materials 0.000 abstract 1
- 239000000463 material Substances 0.000 description 13
- 238000012360 testing method Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 230000001681 protective effect Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 239000007772 electrode material Substances 0.000 description 4
- 239000012298 atmosphere Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000004005 microsphere Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000010405 anode material Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000007600 charging Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- -1 organic acid salts Chemical class 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 101150058243 Lipf gene Proteins 0.000 description 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- QTJOIXXDCCFVFV-UHFFFAOYSA-N [Li].[O] Chemical compound [Li].[O] QTJOIXXDCCFVFV-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010277 constant-current charging Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910000000 metal hydroxide Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910052976 metal sulfide Inorganic materials 0.000 description 1
- 229910003455 mixed metal oxide Inorganic materials 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 238000005303 weighing 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
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
-
- 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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The present disclosure discloses a micro-spherical zinc vanadate. The zinc vanadate has a chemical formula of Zn2V2O7, an average diameter of less than 3 µm and a porous surface structure. The present disclosure also discloses a preparation method of micro-spherical zinc vanadate, comprising the following steps: (1) putting zinc nitrate and zinc metavanadate both 10 of which have a purity of 99.9% into a breaker; (2) adding ethylene glycol into the breaker, evenly stirring, and then adding DMF, so as to obtain a mixed solution; (3) transferring the above mixed solution into a hydrothermal reactor to be heated, and then cooling to room temperature to obtain a product; and (4) centrifuging the obtained product, collecting the centrifuged product, drying, and then calcining to obtain the micro-spherical zinc vanadate. 15 The micro-spherical zinc vanadate of the present disclosure is uniform in size and good in crystallinity.
Description
! LU500937 MICRO-SPHERICAL ZINC VANADATE AS WELL AS
TECHNICAL FIELD The present disclosure belongs to the technical field of battery materials, particularly to a micro-spherical zinc vanadate as well as a preparation method and use thereof.
BACKGROUND Energy issues have become the most important theme in the 21st century. The increasing energy demand in the world has been significantly challenged in today’s society. It is caused by continuous increase in population, continuous increase in gasoline prices, continuous depletion of non-renewable resources such as fossil energy and a mission proposed by China that the emission of CO; is reduced to the minimum. All of them continuously encourage us to find new renewable resource technologies to replace traditional technologies so as to meet people’s needs in life, such as nuclear energy, wind energy, solar energy, tidal energy and fuel cells. In order to deal with these challenges, the storage and conversion of the electrochemical energy of the system is considered to be a feasible energy storage system due to its advantages of high output power, low cost, and environmental protection. For example, lithium-ion batteries, lithium-oxygen batteries, fuel cells and supercapacitors. Since Sony company launched the first-generation lithium-ion battery in 1990, it together with a nickel hydrogen battery has been used as a power source for small electronic products, and has occupied an important position ever since. An electrode material directly or indirectly participates in catalyzing electrochemical reaction, and plays a key role in improving the capacity of energy storage. Graphite carbon has always been the best candidate for the anode material of the lithium-ion battery and has many advantages, including low cost, easy processing, and good chemical stability. In addition, graphitic carbon also has some shortcomings: its theoretical capacity is relatively low, for example, the power output per unit mass or volume is limited, hindering the development of some high-tech industries. Therefore, it is particularly important to use structural design and develop functional advanced electrode materials. Metal oxides, mixed metal oxides, sulfides and hydroxides are all potential advantages for the development of lithium-ion batteries.
The electrochemical performance of metal organic oxides is relatively prominent, and it is expected to replace the current commercial graphite and become a new type of lithium-ion battery anode material. Metallic organic acid salts have received more and more attention in terms of synthesis and morphology control. A reasonable design of the nanostructure of the metallic organic acid salt is very necessary to improve the electronic and ionic conductivity. In view of the above reasons, the present disclosure is put forward.
SUMMARY In order to solve the above problems existing in the prior art, the first objective of the present disclosure is to provide to a micro-spherical zinc vanadate, wherein the zinc vanadate has a chemical formula of Zn,V,07, an average diameter of less than 3 um and a porous surface structure.
The zinc vanadate prepared by the present disclosure can be used as a negative electrode of a lithium battery, which can improve the electrochemical property, increase the first discharge capacity and cycle performance stability, wherein the porous structure is beneficial to penetration of lithium ions.
The second objective of the present disclosure is to provide a preparation method of the micro-spherical zinc vanadate, the method comprising the following steps: (1) putting zinc nitrate and zinc metavanadate both of which have a purity of 99.9% into a breaker; (2) adding ethylene glycol into the breaker, evenly stirring, and then adding DMF, so as to obtain a mixed solution; (3) transferring the above mixed solution into a hydrothermal reactor to be heated, and then cooling to room temperature to obtain a product; and (4) centrifuging the obtained product, collecting the centrifuged product, drying, and then calcining to obtain the micro-spherical zinc vanadate. According to the present disclosure, zinc nitrate and zinc metavanadate are used as raw materials, the micro-spherical zinc vanadate with an uniform size is prepared by solvent thermal and solid sintering methods, the surface of the microsphere is in a porous structure, such the porous structure is beneficial to penetration of lithium ions, a molecular formula is Zn2V207. The zinc vanadate material prepared by this method, as the negative material of the lithium ion battery, shows excellent discharge capacity and stable cycle performance.
Further, in step (1), a molar ratio of zinc nitrate to zinc metavanadate is 1:2. Further, in step (3), a molar volume of zinc nitrate to ethylene glycol to DMF is 1 mmol: 30ml: Sml. Further, in step (3), a volume ratio of water to ethylene glycol in the hydrothermal reactor is 5:3.
Further, in step (3), heating is conducted to 170~190°C which is maintained for 22~26 h, and the heating rate is 3~7°C/min, preferably, heating is conducted to 180°C which is maintained for 24 h, and the heating rate is 5°C/min.
Further, in step (4), the cooling rate is 3~7°C/min, preferably, the cooling rate is 5°C/min.
Further, in step (4), the drying time is 10~14 h, and the drying temperature is 78~82°C, preferably, the drying time is 12 h, and the drying temperature is 80°C.
Further, in step (4), calcination is conducted for 1.5~2 h at 380~420°C at the heating rate of
0.8~1.2°C/min.
The micro-spherical zinc vanadate of the present disclosure is directly composited under the condition of solvent thermal without any templates or surface modifiers, has simple experimental operation process, low cost and high yield. The sample prepared by using the method of the present disclosure is uniform in size and high in purity, and has good charge and discharge performances as the negative material of the lithium ion battery and excellent cycle stability.
The third objective of the present disclosure is to provide use of the micro-spherical zinc vanadate in a battery. The micro-spherical zinc vanadate, when being applied to the negative electrode of the lithium ion battery, under the current density of 100 mAh * g!, has the first charge and discharge specific capacities of 779.2 mAh: g'' and 1075.3 mAh: g respectively and a coulomb efficiency is 72.5%, and has the specific capacity of greater than 860 mAh: g! after charge and discharge for 50 times.
Compared with the prior art, the present disclosure has the beneficial effects: (1) the micro-spherical zinc vanadate of the present disclosure is uniform in size and good in crystallinity, and has a micro-spherical diameter of less than 3 um and a porous surface structure; (2) the micro-spherical zinc vanadate of the present disclosure is prepared by solvent thermal and solid sintering methods without any templates or surface modifiers, and has simple experimental operation process, low cost and high yield; (3) when being applied to the negative material of the lithium ion battery, the micro-spherical zinc vanadate of the present disclosure has good first charge and discharge performances and has excellent cycle stability, the first charge and discharge specific capacities are respectively
779.2 mAh: g' and 1075.3 mAh: g, the coulomb efficiency is 72.5%, and the specific capacity is greater than 860 mAh: g“ after charge and discharge for 50 times.
BRIEF DESCRIPTION OF THE DRAWINGS For more clearly illustrating the embodiments of the present disclosure or the technical solution in the prior art, drawings required to be used in the embodiments or the prior art will be simply discussed below, obviously, the drawings described below are only some embodiments of the present disclosure, other drawings can also be made by persons of ordinary skill in the art without creative efforts according to these drawings.
Fig.1 is an X-ray diffraction (XRD) graph of micro-spherical zinc vanadate prepared in example 1.
Fig.2 is a scanning electron microscope (SEM) graph of micro-spherical zinc vanadate prepared in example 1.
Fig.3 is an SEM amplified graph of micro-spherical zinc vanadate prepared in example 1. Fig.4 is a voltage-specific capacity graph of micro-spherical zinc vanadate prepared in example 1 as an electrode material.
Fig.5 is a cycle performance graph of micro-spherical zinc vanadate prepared in example 1 as an electrode material.
DESCRIPTION OF THE EMBODIMENTS To make the purpose, the technical solutions and the advantages of the present disclosure more apparent, a more detailed description will be provided to the technical solution of the
> LU500937 present disclosure. Obviously, the described embodiments are only a part of embodiments of the present disclosure but not all the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by persons of ordinary skill in the art without creative efforts are included within the protective scope of the present disclosure.
Example 1 A preparation method of micro-spherical zinc vanadate comprises the following steps: (1) 297.5 mg of zinc nitrate with a purity of 99.9% and 234.0 mg of zinc metavanadate with a purity of 99.9% were put into a breaker; (2) 30 ml of ethylene glycol was added into the breaker and stirred for 20 min, and then 5 ml of DMF was added, so as to obtain a mixed solution; (3) the above mixed solution was transferred into a 50 ml hydrothermal reactor to be heated to 180°C at the heating rate of 5°C/min, and then cooled to room temperature at the cooling rate of 5°C/min to obtain a product; and (4) the obtained product was centrifuged, collected, dried for 12 h at 80°C, and then calcined for 2 h in a vacuum tubular furnace at 400°C under an air atmosphere at the heating rate of 1°C/min to obtain the micro-spherical zinc vanadate. The XRD spectroscopy of the obtained micro-spherical zinc vanadate is shown in Fig.1. It can be seen that the intensities and positions of the diffraction peaks of the micro-spherical zinc vanadate prepared in this example are matched with those of Zn2V207 standard card JCPDS No.38-0251, lattice constants a=7.437, b=8.331, and c=10.100, and strong and sharp diffraction peaks show that the prepared sample has good crystalinity. By SEM test, the morphology of the obtained micro-spherical zinc vanadate is of a regular microsphere, as shown in Fig.2, has a uniform size. As shown in Fig 3, after being further magnified, the microsphere has a diameter of less than 3 um, and pore channels with various sizes. The above micro-spherical zinc vanadate was prepared into a battery according to the following steps: (1) 70 mg of prepared zinc vanadate was sufficiently grinded with 20 mg of carbon black for 40 min, and 10 mg of polyvinylidene fluoride and N-methyl pyrrolidone were added to be sufficiently grinded for 30 min; (2) the slurry was coated on copper foil wiped by ethanol, and then put in a vacuum oven to be dried in vacuum for 6 h at 120°C, and further dried after tabletting and weighing; (3) the metal lithium was used as an electrode, a Celgard membrane was used as a diaphragm, EC+DMC+DEC (a volume ratio was 1:1:1) dissolved with LiPFs (1 mol/L) was used as an electrolyte, and assembling was conducted in an glove box in an argon atmosphere to form a CR2032 battery.
After standing for 6 h, a constant-current charging and discharging test was performed by using a LANHE CT 2001A test system. The test voltage selected 0.01-3 V. Fig.4 is the voltage-specific capacity graph of the negative material of the prepared micro-spherical Zn2V207 lithium ion battery when charging and discharging for the first, second and fifth under the current density of 100 mA/g under the condition that the voltage window is 0-3 V. The first charge and discharge specific capacities are respectively 779.2 mAh g'! and 1075.3 mAh: g!, and the coulomb efficiency is 72.5%; and the specific capacity is maintained to be greater than 860 mAh: g” after charge and discharge for 50 times. Fig. 5 shows a constant-current cycle performance test of this sample as a negative material of a lithium ion battery. The current density is 100 mA/g, and the voltage window is 0-3V. With the increase of cycle times, the specific capacity is correspondingly increased, which is because an active material is continuously activated with the increase of charging and discharging times, the application of this material in the field of battery materials explores the research scope of the existing material, and provides experimental data to development of new lithium ion battery materials. Example 2 A preparation method of micro-spherical zinc vanadate comprises the following steps: (1) 595 mg of zinc nitrate with a purity of 99.9% and 468 mg of zinc metavanadate with a purity of 99.9% were put into a breaker; (2) 60 ml of ethylene glycol was added into the breaker and stirred for 20 min, and then 10 ml of DMF was added, so as to obtain a mixed solution; (3) the above mixed solution was transferred into a 100 ml hydrothermal reactor to be heated to 170°C at the heating rate of 3°C/min, and then cooled to room temperature at the cooling rate of 3°C/min to obtain a product; and (4) the obtained product was centrifuged, collected, dried for 14 h at 78°C, and then calcined for 2.5 h in a vacuum tubular furnace at 380°C under an air atmosphere at the heating rate of
0.8°C/min to obtain the micro-spherical zinc vanadate. The XRD graph and SEM graph of the micro-spherical zinc vanadate prepared in this example are basically the same as those in example 1.
The preparation method of the battery in example 1 was used, and the zinc vanadate prepared in example 2 was used as the negative material of the lithium ion battery. After standing for 6 h, a constant-current charge and discharge test was performed by using a LANHE CT 2001A test system. The test voltage selected 0.01-3 V. A constant-current cycle performance test was performed. The results are basically the same as those in example 1.
Example 3 A preparation method of micro-spherical zinc vanadate comprises the following steps: (1) 297.5 mg of zinc nitrate with a purity of 99.9% and 234.0 mg of zinc metavanadate with a purity of 99.9% were put into a breaker; (2) 30 ml of ethylene glycol was added into the breaker, stirred for 20 min, and then 5 ml of DMF was added, so as to obtain a mixed solution; (3) the above mixed solution was transferred into a 50 ml hydrothermal reactor to be heated to 190°C at the heating rate of 7°C/min, then cooled to room temperature at the cooling rate of 7°C/min to obtain a product; and (4) the obtained product was centrifuged, collected, dried for 10 h at 82°C, and then calcined for 1.5 h in a vacuum tubular furnace at 420°C under an air atmosphere at the heating rate of
1.2°C/min to obtain the micro-spherical zinc vanadate.
The XRD graph and SEM graph of the micro-spherical zinc vanadate prepared in this example are basically the same as those in example 1.
The preparation method of the battery in example 1 was used, and the zinc vanadate prepared in example 2 was used as the negative material of the lithium ion battery. After standing for 6 h, a constant-current charge and discharge test was performed by using a LANHE CT 2001A test system. The test voltage selected 0.01-3 V. A constant-current cycle performance test was performed. The results are basically the same as those in example 1.
The above descriptions are only specific embodiments of the present disclosure, but the protective scope of the present disclosure is not limited thereto. Within the technical scope disclosed by the present disclosure, those skilled in the art can easily conceive that variations or replacements are all included within the protective scope of the present disclosure. Therefore, the protective scope of the present disclosure should be based on the protective scope of the appended claims.
Claims (6)
1. A micro-spherical zinc vanadate, wherein the zinc vanadate has a chemical formula of Zn, V,07, an average diameter of less than 3 um and a porous surface structure; wherein, a preparation method of the micro-spherical zinc vanadate comprises the following steps: (1) putting zinc nitrate and zinc metavanadate both of which have a purity of 99.9% into a breaker, a molar ratio of zinc nitrate to zinc metavanadate being 1:2; (2) adding ethylene glycol into the breaker, evenly stirring, and then adding DMF, so as to obtain a mixed solution; (3) transferring the above mixed solution into a hydrothermal reactor to be heated to 170°C~190°C at the heating rate of 3-7°C/min, and maintaining for 22~26 h, a molar volume of zinc nitrate to ethylene glycol to DMF being 1 mmol: 30ml: 5ml, a volume ratio of water to ethylene glycol in the hydrothermal reactor being 5:3, and then cooling to room temperature at the cooling rate of 3-7°C/min to obtain a product; and (4) centrifuging the obtained product, collecting the centrifuged product, drying, and then calcining to obtain the micro-spherical zinc vanadate.
2. The micro-spherical zinc vanadate according to claim 1, wherein in step (3), heating is conducted to 180°C which is maintained for 24 h, and the heating rate is 5°C/min.
3. The micro-spherical zinc vanadate according to claim 1, wherein in step (3), the cooling rate is 5°C/min.
4. The micro-spherical zinc vanadate according to any one of claims 1-3, wherein in step (4), the drying time is 10-14 h, and the drying temperature is 78~82°C.
5. The micro-spherical zinc vanadate according to claim 4, wherein the drying time is 12 h, and the drying temperature is 80°C.
6. A use of the micro-spherical zinc vanadate according to any one of claims 1-5 in a battery, wherein the micro-spherical zinc vanadate, when being applied to a negative electrode of a lithium ion battery, under the current density of 100 mAh:g", has the first charge-discharge specific capacities of 779.2 mAh-g™! and 1075.3 mAh-g" respectively and has a coulomb efficiency of 72.5%, and has the specific capacity of greater than 860 mAh: g" after charge and discharge for 50 times.
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| Application Number | Priority Date | Filing Date | Title |
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| LU500937A LU500937B1 (en) | 2021-12-01 | 2021-12-01 | Micro-spherical zinc vanadate as well as preparation method and use thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| LU500937A LU500937B1 (en) | 2021-12-01 | 2021-12-01 | Micro-spherical zinc vanadate as well as preparation method and use thereof |
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