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Flaky ammonium vanadium oxide, preparation method and applications thereof

An ammonium vanadium oxide and vanadium oxide technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of poor electrochemical cycle performance and large particle size of ammonium vanadium oxide, and achieve easy mass production, The effect of low cost and mild synthesis conditions

Inactive Publication Date: 2018-03-16
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems of large particle size and poor electrochemical cycle performance of the above-mentioned ammonium vanadium oxide, the purpose of the present invention is to provide a kind of ammonium vanadium oxide with stable chemical properties, not easy to be oxidized, and good cycle performance

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  • Flaky ammonium vanadium oxide, preparation method and applications thereof
  • Flaky ammonium vanadium oxide, preparation method and applications thereof
  • Flaky ammonium vanadium oxide, preparation method and applications thereof

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preparation example Construction

[0045] As a detailed example, the preparation method includes the following steps: (1) dissolving ammonium metavanadate in distilled water. (2) Under magnetic stirring, add the metal borohydride into the ammonium metavanadate solution in step (1), and continue stirring for 5 minutes to 60 minutes. (3) Transfer the solution obtained in step (2) into a reaction kettle and seal it, react at 160-240° C. for 4-100 h, cool, filter, wash and dry, and obtain the desired flaky ammonium vanadium oxide.

[0046] Flaky (NH 4 ) x V 2 o 5 (x=0.65±0.10) can be used as the active component of the cathode material of the lithium ion battery. The method for preparing the positive electrode of the lithium-ion battery is exemplarily described below.

[0047] Preparation of positive electrodes for lithium-ion batteries. Flaky (NH 4 ) x V 2 o 5 (x=0.65 ± 0.10) as the active component of the positive electrode material of lithium-ion battery, conductive agent is super conductive carbon bl...

Embodiment 1

[0051] Flake ammonium vanadium oxide (NH 4 ) x V 2 o 5 (x=0.55) preparation method comprises the following steps:

[0052] (1) 1g ammonium metavanadate is dissolved in 40mL distilled water;

[0053] (2) under magnetic stirring, 0.021g lithium borohydride is added in the ammonium metavanadate solution of step (1), continue to stir for 5 minutes;

[0054] (3) Move the solution obtained in step (2) into the reaction kettle and seal it. React at 240°C for 4 hours, and after cooling, filtering, washing and drying, the desired flaky ammonium vanadium oxide is obtained. The molar ratio of ammonium metavanadate to lithium borohydride is: 8.54:1.

[0055] The flake ammonium vanadium oxide is analyzed by XRD, TEM, EDS, Raman, FT-IR, XPS and EA, and its chemical formula is (NH 4 ) 0.55 V 2 o 5 .

[0056] The XRD pattern of the product is as follows figure 1 As shown, it can be seen from the figure that there is no impurity phase in the product, and it is a pure phase (NH 4 )...

Embodiment 2

[0059] Flake ammonium vanadium oxide (NH 4 ) x V 2 o 5 (x=0.75) preparation method comprises the following steps:

[0060] (1) 1g ammonium metavanadate is dissolved in 40mL distilled water;

[0061] (2) under magnetic stirring, 0.077g sodium borohydride was added in the ammonium metavanadate solution of step (1), and continued to stir for 60 minutes;

[0062] (3) Move the solution obtained in step (2) into the reaction kettle and seal it. React at 160°C for 100 h, and after cooling, filtering, washing and drying, the desired flaky ammonium vanadium oxide is obtained. The molar ratio of ammonium metavanadate to sodium borohydride is: 4.2:1.

[0063] The flake ammonium vanadium oxide is analyzed by XRD, TEM, EDS, Raman, FT-IR, XPS and EA, and its chemical formula is (NH 4 )0.75 V 2 o 5 .

[0064] The XRD pattern of the product is as follows Figure 5 As can be seen from the figure, there is no impurity phase in the product. Although the chemical formula obtained is s...

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Abstract

The invention relates to a flaky ammonium vanadium oxide, a preparation method and applications thereof, wherein the ammonium vanadium oxide is flaky, and has the composition of (NH4)xV2O5, x is morethan or equal to 0.55 and is less than or equal to 0.75, the thickness of the ammonium vanadium oxide is 100-1000 nm, and a ratio of the length to the thickness of the longest edge of the ammonium vanadium oxide is more than 100. According to the present invention, the ammonium vanadium oxide has the small thickness size, has the small lithium ion diffusion distance during the charge and discharge, and has the large surface area due to the flaky morphology so as to increase the contact area between the electrode and the electrolyte, such that the capacity attenuation is retarded, and the capacity and the cycle stability of the ammonium vanadium oxide are improved.

Description

technical field [0001] The invention relates to the field of preparation of positive electrode materials for batteries, in particular to a flaky ammonium vanadium oxide for lithium ion battery positive electrode materials and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries have the advantages of high energy density, long cycle life and small self-discharge, and have been widely used in various portable electronic products and mobile devices, and the positive electrode material of lithium-ion batteries is an important part of this type of battery , the performance of cathode materials restricts the power and energy density of lithium-ion batteries. [0003] Lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ), lithium manganate (LiMn 2 o 4 ), polyanionic materials lithium iron phosphate (LiFePO 4 ) and vanadium oxides, etc. Among them, lithium cobalt oxide is the earliest commercialized positive electrode material, bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485
CPCH01M4/485Y02E60/10
Inventor 金平实马艺宁李荣纪士东
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI