CN105655582A - Method for coating and modifying lithium vanadium phosphate positive pole material with novel carbon source - Google Patents
Method for coating and modifying lithium vanadium phosphate positive pole material with novel carbon source Download PDFInfo
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- CN105655582A CN105655582A CN201610081936.0A CN201610081936A CN105655582A CN 105655582 A CN105655582 A CN 105655582A CN 201610081936 A CN201610081936 A CN 201610081936A CN 105655582 A CN105655582 A CN 105655582A
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- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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- 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
- H01M4/5805—Phosphides
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- 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 method for coating and modifying a lithium vanadium phosphate positive pole material with a novel carbon source. The method includes the following steps that a lithium source, a vanadium source, a phosphorus source and a carbon source are mixed uniformly, deionized water is added, and a rheological-phase solid-liquid mixture is obtained through grinding; the rheological-phase solid-liquid mixture is moved into a high-pressure reaction kettle to react for 8-15 h at the temperature of 70 DEG C-90 DEG C to obtain a precursor; the precursor is dried for 3-5 h at the temperature of 55 DEG C-65 DEG C; the dried precursor is sintered for 3-5 h at the temperature of 300 DEG C-400 DEG C and cooled to obtain a pretreated material; the pretreated material is sintered for 6-10 h at the temperature of 700 DEG C-850 DEG C and cooled to obtain the carbon coated and modified lithium vanadium phosphate material. The method for coating and modifying the lithium vanadium phosphate positive pole material with the novel carbon source is simple in process, low in synthesis temperature, and suitable for large-scale production, and the prepared lithium vanadium phosphate positive pole material coated with cyclodextrin has excellent electrochemical performance.
Description
Technical field
The present invention relates to technical field of lithium ion, be more particularly to a kind of method adopting novel carbon source coating modification vanadium phosphate cathode material.
Background technology
Lithium ion battery is because the advantages such as its energy density is high, self discharge is little, have extended cycle life, environmental protection are considered as 21st century desirable energy storage material. In four ingredients of battery, shared by positive electrode, battery cost is the highest, for 30-40%, its specific capacity improves 50%, and the power density of battery will improve 28%, therefore, the exploitation of positive electrode is to reducing battery cost, and the chemical property improving battery plays critical effect.
Positive electrode is through layer structure LiMO2(M=Co, Ni, Mn), spinel structure LiMn2O4, constantly advance in the stage. In recent years, polyanionic phosphate material, because theoretical capacity is high, good cycle, cheap, the advantage such as aboundresources, become the focus of research. Wherein monocline Li3V2(PO4)3Positive electrode theoretical capacity is up to 197mAhg-1, there is crystal structure stable, the advantages such as cyclicity is good, and charging/discharging voltage platform is high, cheap, it is believed that be the LiFePO that continues4The anode material for lithium-ion batteries of another great market application potential afterwards.
At present, both at home and abroad the research of phosphoric acid vanadium lithium is concentrated mainly in the modified of material and the improvement of preparation method. Preparation method has traditional and novel dividing, and traditional method includes solid-phase synthesis, carbothermic method, sol-gal process and hydrothermal synthesis method etc., and novel method includes wet method solid state reaction of coordination method, process for solid-phase microwave synthesis and Rheological Phase Method etc. High temperature solid phase synthesis is that after raw material passes through ball milling mixing fully, a kind of method being at high temperature synthesized, generally with hydrogen as going back original reagent, building-up process technique is simple, it is easy to realize industrialization. But the method synthetic product particle diameter is relatively big, topographic profile is irregular, and material purity is relatively low, and chemical property is unsatisfactory. Sol-gel process is first to be dissolved in deionized water by raw material according to stoichiometric proportion, adds chelating reagent and makes raw material formation colloidal sol eventually form gel, dries high-temperature calcination after grinding and obtain material requested.The granule that this synthetic method obtains is less, and the chemical property of material is good, but its building-up process step is many, operates more complicated, requires comparatively harsh to reaction condition. In numerous techniques, Rheological Phase Method, as novel effective soft chemical method, is more and more applied in the preparation of material. Rheological Phase Method be by raw material by metering more abundant than mixing after grind, add deionized water or alcoholic solution be adjusted to stream metamorphosis, then dry, pretreatment, high-temperature calcination obtain respective material. It is a kind of method between high temperature process heat and sol-gel, reactant is in the solid-liquid two-phase coexistent state non-fully dissolved, can strengthen between solids and effectively contact, make its mix homogeneously, have that synthesis temperature is low, calcination time is short, the advantages such as distribution of material is uniform of preparation, can make the chemical property of material be not fully exerted.
Phosphoric acid vanadium lithium has the shortcoming that phosphate cathode material is total too, and namely electronic conductivity is low, it is necessary to it is modified research. At present, the method for modifying of phosphoric acid vanadium lithium mainly has carbon to be coated with, adulterate, prepare special appearance etc., and wherein coated modified carbon method is most commonly seen. Carbon cladding is possible not only to improve material conductivity, it is also possible to reduce the granular size of product in product crystallization process as nucleator, thus shortening the diffusion admittance of lithium ion, improve the chemical property of material, and carbon source wide material sources, synthesis technique is simple, and effect is more notable. Common carbon source has sucrose, citric acid, Polyethylene Glycol etc.
Cyclodextrin (beta-schardinger dextrin-and gamma-cyclodextrin) is a kind of cyclic oligomer glucose, molecule has the hollow cylinder three-dimensional ring structure tapered slightly, molecular complex can be formed with multiple inorganic and organic compound, in lithium ion battery, cyclodextrin can as the effective dispersing solid substances of surfactant in liquid, and promote complex reaction as chelating agent, be conducive to dispersion and the molding of material. Meanwhile, cyclodextrin is used as carbon source, and the loose structure carbon generated in pyrolytic process can hinder product to reunite, reach the purpose of micronized particles, micronized particles can not only shorten lithium ion the evolving path, and is conducive to increasing specific surface area, it is ensured that in material, more active substance is utilized. Additionally, cyclodextrin pyrolytic carbon has better degree of graphitization, electronic conductivity and the lithium ion diffusion rate of material can be effectively improved, thus improving the chemical property of phosphoric acid vanadium lithium.
But adopt the pure phase phosphoric acid vanadium lithium prepared of Rheological Phase Method to have the defects such as electronic and ionic poorly conductive, lithium ion diffusion coefficient are low as anode material for lithium-ion batteries, it is necessary in the method, it to be carried out coated modified carbon research.
Summary of the invention
(1) to solve the technical problem that
The technical problem to be solved in the present invention is how to prepare the lithium ion battery vanadium phosphate cathode material with good electrical chemical property, and provides a kind of method adopting cyclodextrin to be carbon source coating modification vanadium phosphate cathode material.
(2) technical scheme
In order to solve above-mentioned technical problem, the invention provides a kind of method adopting carbon source coating modification vanadium phosphate cathode material, the method comprises the steps:
Step one: by lithium source, vanadium source, phosphorus source, carbon source Homogeneous phase mixing, then adds deionized water, then grinding obtains the solidliquid mixture that stream is covert; The amount ratio of described lithium source, vanadium source, phosphorus source, carbon source and deionized water is Li:V:P: cyclodextrin: deionized water=3.0��3.3mol:2mol:3mol:0.1��0.16mol:400��600ml;
Step 2: the covert solidliquid mixture of stream is moved in autoclave and reacts, reaction temperature 70��90 DEG C, response time 8��15h, obtain presoma;
Step 3: by presoma at 55��65 DEG C of dry 3��5h;
Step 4: at 300��400 DEG C, presoma is sintered 3��5h, then obtains material previously treated after cooling;
Step 5: material previously treated is sintered 6��10h at 700��850 DEG C, then cools down, to obtain final product.
Preferably, described lithium source be Lithium hydrate, lithium carbonate, lithium acetate, lithium fluoride, lithium oxalate one or more.
Preferably, described vanadium source is vanadic anhydride and/or ammonium metavanadate.
Preferably, phosphorus source be ammonium dihydrogen phosphate, diammonium phosphate, ammonium phosphate one or more.
Preferably, described carbon source is beta-schardinger dextrin-and/or gamma-cyclodextrin.
Preferably, described in be sintered under inert gas shielding to carry out, described noble gas be argon, helium, nitrogen one or more.
Preferably, in step 5, first material previously treated is ground, obtain abrasive, then by its compacting 5��10min under 5��10MPa, obtain the solid sheet that thickness is 0.5��1cm.
The present invention also provides for the vanadium phosphate cathode material that the method for described employing carbon source coating modification vanadium phosphate cathode material prepares.
(3) beneficial effect
The method technique that the present invention adopts cyclodextrin to be carbon source coating modification vanadium phosphate cathode material is simple, synthesis temperature is low, being suitable for large-scale production, the lithium vanadium phosphate lithium ion battery positive pole material that cyclodextrin (beta-schardinger dextrin-or gamma-cyclodextrin) prepared by the present invention is coated with has more excellent chemical property. Described method cyclodextrin can make raw material better disperse as chelating agen and surfactant and carry out complexation reaction, cyclodextrin (beta-schardinger dextrin-or gamma-cyclodextrin) is coated on phosphoric acid vanadium lithium surface as carbon source again simultaneously, is effectively improved micro Distribution and the chemical property of material. In its phase character, there is not the diffraction maximum of impurity peaks and carbon in XRD figure spectrum, it was shown that synthesized by the sample that goes out be pure phase monocline phosphoric acid vanadium lithium. Grain diameter is about 0.3 ��m, and effectively uniformly the amorphous carbon layer of cladding is about 50nm. On chemical property, this material in 3.0-4.3V voltage range under 0.1C multiplying power, first week charging capacity 121mAhg of material-1, discharge capacity is 111mAhg-1, coulombic efficiency is up to 91.7%, and after circulating 50 weeks, capacity is maintained at 109.3mAhg-1, capability retention is 98.5%.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is X-ray diffraction (XRD) figure of the beta-schardinger dextrin-coating modification vanadium phosphate cathode material of the embodiment of the present invention 1 preparation;
Fig. 2 is scanning electron microscope (SEM) figure of the beta-schardinger dextrin-coating modification vanadium phosphate cathode material of the embodiment of the present invention 1 preparation;
Fig. 3 is transmission electron microscope (TEM) figure of the beta-schardinger dextrin-coating modification vanadium phosphate cathode material of embodiment 1 preparation;
When Fig. 4 is that charge-discharge magnification is 0.1C within the scope of 3.0-4.3V, the first charge-discharge curve chart of the beta-schardinger dextrin-coating modification vanadium phosphate cathode material of the embodiment of the present invention 1 preparation;
When Fig. 5 is that charge-discharge magnification is 0.1C within the scope of 3.0-4.3V, the cycle performance curve chart of the beta-schardinger dextrin-coating modification vanadium phosphate cathode material of the embodiment of the present invention 1 preparation;
When Fig. 6 is that charge-discharge magnification is 0.1C within the scope of 3.0-4.8V, the cycle performance curve chart of the beta-schardinger dextrin-coating modification vanadium phosphate cathode material of the embodiment of the present invention 1 preparation;
Fig. 7 is within the scope of 3.0-4.3V, and when charge-discharge magnification respectively 0.2C, 0.5C, 1C and 2C, the real present invention executes the high rate performance curve chart of the beta-schardinger dextrin-coating modification vanadium phosphate cathode material of example 1 preparation;
When Fig. 8 is that charge-discharge magnification is 0.1C within the scope of 3.0-4.3V, the first charge-discharge curve chart of the beta-schardinger dextrin-coating modification vanadium phosphate cathode material of the embodiment of the present invention 2 preparation;
When Fig. 9 is that charge-discharge magnification is 0.1C within the scope of 3.0-4.8V, the first charge-discharge curve chart of the gamma-cyclodextrin coating modification vanadium phosphate cathode material of the embodiment of the present invention 3 preparation;
Detailed description of the invention
Below in conjunction with drawings and Examples, embodiments of the present invention are described in further detail. Following example are used for illustrating the present invention, but can not be used for limiting the scope of the present invention.
Embodiment 1
The vanadium phosphate cathode material of preparation carbon source coating modification, its step is as follows: by lithium source 0.079molLi2CO3, vanadium source 0.05molV2O5, phosphorus source 0.15molNH4H2PO4Being ground in mortar with 0.006mol beta-schardinger dextrin-, after 30min mix homogeneously, dropping adds 30ml deionized water, grinds and obtains flowing covert solidliquid mixture uniformly; Being moved to by solidliquid mixture in the hydrothermal reaction kettle being lined with politef set, at 80 DEG C of temperature, pretreatment 12h, obtains presoma; By presoma dry 4h in 60 DEG C of baking ovens; Presoma is moved in argon tube furnace, under 350 DEG C of conditions, sinter 3h, after natural cooling, obtain light green material previously treated; Material previously treated is ground, under 8Mpa after compacting 10min, obtain the solid sheet that thickness is 0.8cm, then move to argon tube furnace sinters at 750 DEG C 6h, obtain black solid after natural cooling, be the vanadium phosphate cathode material of the beta-schardinger dextrin-cladding adopting Rheological Phase Method synthesis.
The vanadium phosphate cathode material of the beta-schardinger dextrin-cladding obtained is detected, and result is referring to Fig. 1-3:
Fig. 1 is X-ray diffraction (XRD) figure of the beta-schardinger dextrin-coating modification vanadium phosphate cathode material of embodiment 1 preparation, illustrates that what obtain is the lithium vanadium phosphate material of monocline, and free from admixture produces mutually;
Fig. 2 is scanning electron microscope (SEM) figure of the beta-schardinger dextrin-coating modification vanadium phosphate cathode material of embodiment 1 preparation, illustrate that the granular size of cladding material is less than 0.3 ��m, and be uniformly distributed in spherical, clear-cut, corner angle are clearly demarcated, without obvious agglomeration.
Fig. 3 is transmission electron microscope (TEM) figure of the beta-schardinger dextrin-coating modification vanadium phosphate cathode material of embodiment 1 preparation, middle black part is divided into phosphoric acid vanadium lithium, the transparent part at black particle edge is the amorphous carbon that beta-schardinger dextrin-pyrolysis is formed, and described amorphous carbon is evenly coated on phosphoric acid vanadium lithium matrix.
Test example 1
It is 8:1:1 mix homogeneously by the positive electrode prepared by embodiment 1, acetylene black, Kynoar (PVDF) according to mass ratio, add a certain amount of Solvents N-methyl-2-Pyrrolidone (NMP), put into the mixed pulpous state of wearing into of agate mortar, regulate to certain viscosity. Slurry is applied on aluminium foil uniformly, at 80 DEG C of dry 12h, real in the pressure of 8MPa after drying, finally cut into the electrode slice that diameter is 10mm;With above-mentioned electrode slice for positive pole, with metal lithium sheet for electrode, polypropylene porous film Celgard2400 is barrier film, electrolyte adopts 1.0mol/LLiPF6-EC+DMC (volume ratio 1:1), the glove box of full argon is assembled into button 2025 type battery, then testing system at land and do constant current charge-discharge loop test, discharge and recharge blanking voltage is 3.0��4.3V and 3.0��4.8V.
Test result is referring to Fig. 4-7:
When Fig. 4 is that within the scope of 3.0-4.3V, charge-discharge magnification is 0.1C, the first charge-discharge curve of the beta-schardinger dextrin-coating modification vanadium phosphate cathode material of embodiment 1 preparation. Described employing beta-schardinger dextrin-is the discharge capacity first of carbon source coating modification vanadium phosphate cathode material is 111mAhg-1, coulombic efficiency is 91.7%, has the reversibility of excellence;
When Fig. 5 is that within the scope of 3.0-4.3V, charge-discharge magnification is 0.1C, the cycle performance curve of the beta-schardinger dextrin-coating modification vanadium phosphate cathode material of embodiment 1 preparation, after circulating 50 weeks, discharge capacity is 109.3mAhg-1, capability retention is 98.46%;
When Fig. 6 is that within the scope of 3.0-4.8V, charge-discharge magnification is 0.1C, the cycle performance curve of beta-schardinger dextrin-coating modification vanadium phosphate cathode material of embodiment 1 preparation, after within 25 weeks, circulating, discharge capacity is from initial capacity 151.4mAhg-1It is reduced to 131.5mAhg-1, capability retention is 86.85%;
Fig. 7 is within the scope of 3.0-4.3V, when charge-discharge magnification respectively 0.2C, 0.5C, 1C and 2C, and the high rate performance curve of the beta-schardinger dextrin-coating modification vanadium phosphate cathode material of embodiment 1 preparation. Returning 0.2C after circulating 35 weeks, material discharging capacity is 110.8mAhg-1, reach the 97.44% of initial capacity.
Embodiment 2
A kind of employing cyclodextrin of the present invention is the method for carbon source coating modification vanadium phosphate cathode material, and described method step is as follows: by lithium source 0.16molLiF, vanadium source 0.05molV2O5, phosphorus source 0.15molNH4H2PO4Being ground in mortar with 0.0058mol beta-schardinger dextrin-, after 30min mix homogeneously, dropping adds 30ml deionized water, grinds and obtains flowing covert solidliquid mixture uniformly; Being moved to by solidliquid mixture in the hydrothermal reaction kettle being lined with politef set, at 80 DEG C of temperature, pretreatment 12h, obtains presoma; By presoma dry 4h in 60 DEG C of baking ovens; Presoma is moved in argon tube furnace, under 350 DEG C of conditions, sinter 4h, after natural cooling, obtain material previously treated; Material previously treated is ground, under 8Mpa after compacting 10min, obtain the solid sheet that thickness is 0.8cm, then move to argon tube furnace sinters at 750 DEG C 8h, obtain solid after natural cooling, be the vanadium phosphate cathode material of the beta-schardinger dextrin-cladding adopting Rheological Phase Method synthesis. XRD, SEM and the TEM test result that described employing beta-schardinger dextrin-is carbon source coating modification vanadium phosphate cathode material is similar to embodiment 1. It is that carbon source coating modification vanadium phosphate cathode material prepares test battery testing chemical property by the method for embodiment 1 by described employing beta-schardinger dextrin-. When Fig. 8 is that in 3.0-4.3V voltage range, charge-discharge magnification is 0.1C, the first charge-discharge curve chart adopting beta-schardinger dextrin-to be carbon source coating modification vanadium phosphate cathode material of embodiment 2 preparation, its first week charge and discharge capacity respectively 115.8mAhg-1And 104.5mAhg-1, coulombic efficiency is up to 90.24%.
Embodiment 3
A kind of employing gamma-cyclodextrin of the present invention is the method for carbon source coating modification vanadium phosphate cathode material, and described method step is as follows: by lithium source 0.16molLiOH, vanadium source 0.1molNH4VO3, phosphorus source 0.15molNH4H2PO4Being ground in mortar with 0.006mol gamma-cyclodextrin, after 30min mix homogeneously, dropping adds 30ml deionized water, grinds and obtains flowing covert solidliquid mixture uniformly;Being moved to by solidliquid mixture in the hydrothermal reaction kettle being lined with politef set, at 75 DEG C of temperature, pretreatment 12h, obtains presoma; By presoma dry 4h in 60 DEG C of baking ovens; Presoma is moved in argon tube furnace, under 350 DEG C of conditions, sinter 3h, after natural cooling, obtain material previously treated; Material previously treated is ground, under 8Mpa after compacting 10min, obtain the solid sheet that thickness is 0.8cm, then move to argon tube furnace sinters at 750 DEG C 7h, obtain solid after natural cooling, be the vanadium phosphate cathode material of the gamma-cyclodextrin cladding adopting Rheological Phase Method synthesis. XRD, SEM and the TEM test result that described employing gamma-cyclodextrin is carbon source coating modification vanadium phosphate cathode material is similar to embodiment 1. It is that carbon source coating modification vanadium phosphate cathode material prepares test battery testing chemical property by the method for embodiment 1 by described employing gamma-cyclodextrin. When Fig. 9 is that within the scope of 3.0-4.8V, charge-discharge magnification is 0.1C, the first charge-discharge curve of the gamma-cyclodextrin coating modification vanadium phosphate cathode material of embodiment 3 preparation. Described employing gamma-cyclodextrin is the initial charge capacity of carbon source coating modification vanadium phosphate cathode material is 185.1mAhg-1, discharge capacity is 151.4mAhg-1, high voltage capability is excellent;
Embodiment of above is merely to illustrate the present invention, but not limitation of the present invention. Although the present invention being described in detail with reference to embodiment, it will be understood by those within the art that, technical scheme is carried out various combination, amendment or equivalent replacement, without departure from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of scope of the presently claimed invention.
Claims (8)
1. the method adopting novel carbon source coating modification vanadium phosphate cathode material, it is characterised in that the method comprises the steps:
Step one: by lithium source, vanadium source, phosphorus source, carbon source Homogeneous phase mixing, then adds deionized water, then grinding obtains the solidliquid mixture that stream is covert; The amount ratio of described lithium source, vanadium source, phosphorus source, carbon source and deionized water is Li:V:P: cyclodextrin: deionized water=3.0��3.3mol:2mol:3mol:0.1��0.16mol:400��600ml;
Step 2: the covert solidliquid mixture of stream is moved in autoclave and reacts, reaction temperature 70��90 DEG C, response time 8��15h, obtain presoma;
Step 3: by presoma at 55��65 DEG C of dry 3��5h;
Step 4: dried presoma is sintered 3��5h at 300��400 DEG C, then obtains material previously treated after natural cooling;
Step 5: at 700��850 DEG C, material previously treated is sintered 6��10h, then natural cooling, obtains the vanadium phosphate cathode material of cyclodextrin cladding.
2. the method for employing carbon source coating modification vanadium phosphate cathode material according to claim 1, it is characterised in that described lithium source be Lithium hydrate, lithium carbonate, lithium acetate, lithium fluoride, lithium oxalate one or more.
3. the method for employing carbon source coating modification vanadium phosphate cathode material according to claim 1, it is characterised in that described vanadium source is vanadic anhydride and/or ammonium metavanadate.
4. the method for employing carbon source coating modification vanadium phosphate cathode material according to claim 1, it is characterised in that phosphorus source be ammonium dihydrogen phosphate, diammonium phosphate, ammonium phosphate one or more.
5. the method for employing carbon source coating modification vanadium phosphate cathode material according to claim 1, it is characterised in that described carbon source is beta-schardinger dextrin-and/or gamma-cyclodextrin.
6. the method for the employing carbon source coating modification vanadium phosphate cathode material according to any one of claim 1-5, it is characterised in that described in be sintered under inert gas shielding to carry out, described noble gas be argon, helium, nitrogen one or more.
7. the method for the employing carbon source coating modification vanadium phosphate cathode material according to claim 1-5, it is characterised in that in step 5, first material previously treated is ground, obtain abrasive, then by its compacting 5��10min under 5��10MPa, obtain the solid sheet that thickness is 0.5��1cm.
8. the vanadium phosphate cathode material that the method for the employing carbon source coating modification vanadium phosphate cathode material described in claim 1-7 prepares.
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Cited By (11)
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| CN106684337A (en) * | 2017-03-07 | 2017-05-17 | 中科天达（天津）新能源科技有限公司 | Preparation method for lithium vanadium phosphate slurry-based positive electrode of lithium ion battery |
| CN108101108A (en) * | 2017-12-14 | 2018-06-01 | 陕西科技大学 | A kind of β-Cu2V2O7Raw powder's production technology |
| CN108123108A (en) * | 2016-11-28 | 2018-06-05 | 中国科学院大连化学物理研究所 | The preparation method and positive electrode of a kind of vanadium phosphate cathode material and application |
| CN108539179A (en) * | 2018-04-28 | 2018-09-14 | 河南工业大学 | Phosphoric acid vanadium lithium combination electrode material and the preparation method and application thereof |
| CN108539180A (en) * | 2018-04-28 | 2018-09-14 | 河南工业大学 | Lithium zirconate-phosphoric acid vanadium lithium combination electrode material and the preparation method and application thereof |
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| CN113845152A (en) * | 2021-08-30 | 2021-12-28 | 蜂巢能源科技有限公司 | Lithium nickel manganese oxide positive electrode material, preparation method thereof and lithium ion battery |
| CN114094082A (en) * | 2021-11-22 | 2022-02-25 | 湖南裕能新能源电池材料股份有限公司 | Lithium vanadium phosphate-carbon composite cathode material, preparation method thereof, lithium ion battery and electric equipment |
| WO2024071408A1 (en) * | 2022-09-30 | 2024-04-04 | 日本ケミコン株式会社 | Electrode material, power storage device, and method for producing electrode material |
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| CN108539180B (en) * | 2018-04-28 | 2021-01-26 | 河南工业大学 | Lithium zirconate-lithium vanadium phosphate composite electrode material and preparation method and application thereof |
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| CN108539180A (en) * | 2018-04-28 | 2018-09-14 | 河南工业大学 | Lithium zirconate-phosphoric acid vanadium lithium combination electrode material and the preparation method and application thereof |
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| CN113830845A (en) * | 2021-10-14 | 2021-12-24 | 浙江帕瓦新能源股份有限公司 | Preparation method of carbon and yttrium oxide double-coated nickel-manganese zirconium-doped binary anode material |
| CN114094082A (en) * | 2021-11-22 | 2022-02-25 | 湖南裕能新能源电池材料股份有限公司 | Lithium vanadium phosphate-carbon composite cathode material, preparation method thereof, lithium ion battery and electric equipment |
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