A doped modified sodium vanadium phosphate positive electrode material and preparation method thereof

A technology of sodium vanadium fluorophosphate and positive electrode material, which is applied to battery electrodes, structural parts, electrical components, etc., can solve the problems of unfavorable industrialization and other production technologies, low charge-discharge specific capacity, and complicated process, and achieves a favorable transmission rate. , excellent rate performance, the effect of increasing the transportation channel

Active Publication Date: 2020-09-11
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a doped modified vanadium vanadium phosphate positive electrode material and its preparation method, to solve the shortcomings of the existing sodium vanadium fluorophosphate positive electrode material, such as complicated process and unfavorable production technology and the existing Sodium vanadium fluorophosphate positive electrode material has low charge-discharge specific capacity, unstable cycle and poor rate performance and other electrochemical performance deficiencies, so that the sodium vanadium fluorophosphate material can achieve the purpose of increasing charge-discharge specific capacity, optimizing cycle performance, and improving rate performance

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  • A doped modified sodium vanadium phosphate positive electrode material and preparation method thereof
  • A doped modified sodium vanadium phosphate positive electrode material and preparation method thereof
  • A doped modified sodium vanadium phosphate positive electrode material and preparation method thereof

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Embodiment 1

[0027] A preparation method of doped modified sodium vanadium fluorophosphate cathode material, comprising:

[0028] (1) Take 1.072g of citric acid, add NaF, NH 4 VO 3 , Ca(NO 3 ) 2 ·4H 2 O, NH 4 H 2 PO 4 And C 6 H 8 O 7 ·H 2 After the O is weighed according to the substance ratio of 3:1.95:0.05:2:1.6, it is added to 20 ml of deionized water at a speed of 400 r / min at 80 ○ C was stirred for 1 hour to obtain a uniformly dissolved and dispersed precursor solution.

[0029] (2) Put the above precursor solution at 80 ○ C. After drying in a blast drying box for 18 hours, grind it in a mortar to obtain a precursor; ○ C heat preservation for 4 hours, 650 ○ C sintered for 8 hours to obtain the doped modified sodium vanadium fluorophosphate cathode material Na 3 V 1.95 Ca 0.05 (PO 4 ) 2 F 3 . The prepared calcium-doped sodium vanadium fluorophosphate was used as a sodium ion battery cathode material for electrochemical performance test, and the electrode ratio was sodium vanadium fluorophosp...

Embodiment 2

[0031] A preparation method of doped modified sodium vanadium fluorophosphate cathode material, comprising:

[0032] (1) Take 2 g of citric acid, add NaF, NH 4 VO 3 , Ca(OH) 2 , NH 4 H 2 PO 4 And C 6 H 8 O 7 ·H 2 After the O is weighed according to the substance ratio of 3:1.95:0.05:2:3, it is added to 15 ml of deionized water at a speed of 500 r / min at 60 ○ C was stirred for 6 hours to obtain a uniformly dissolved and dispersed precursor solution.

[0033] (2) Put the above precursor solution at 120 ○ C dry in a blast drying box for 6 hours, grind in a mortar to obtain a precursor; the above-mentioned precursor is heated under a nitrogen atmosphere at 300 ○ C heat preservation for 5 hours, 700 ○ C sintering for 6 hours to obtain the doped modified sodium vanadium fluorophosphate cathode material Na 3 V 1.9 Ca 0.1 (PO 4 ) 2 F 3 . The prepared calcium-doped sodium vanadium fluorophosphate was used as a sodium ion battery cathode material for electrochemical performance test, and the ...

Embodiment 3

[0035] A preparation method of doped modified sodium vanadium fluorophosphate cathode material, comprising:

[0036] (1) Take 1.072 g of citric acid, add NaF, NH 4 VO 3 , CaCO 3 , NH 4 H 2 PO 4 And C 6 H 8 O 7 ·H 2 After the O is weighed according to the substance ratio of 3:1.9:0.1:2:1.6, it is added to 40 ml of deionized water at a speed of 300 r / min at 100 ○ C was stirred for 0.2 hours to obtain a uniformly dissolved and dispersed precursor solution.

[0037] (2) Place the above-mentioned precursor solution in a blast drying oven at 80 ℃ for 18 hours, and grind in a mortar to obtain the precursor; the above-mentioned precursor solution is heated at 400°C under a high-purity argon atmosphere. ○ C heat treatment for 5 hours, 600 ○ C sintered for 8 hours to obtain the doped modified sodium vanadium fluorophosphate cathode material Na 3 V 1.8 Ca 0.2 (PO 4 ) 2 F 3 . The prepared calcium-doped sodium vanadium fluorophosphate was used as a sodium ion battery cathode material for electro...

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Abstract

The invention discloses a doped and modified sodium vanadium fluorophosphate cathode material and a preparation method thereof. According to the cathode material, the problems that an existing sodiumvanadium fluorophosphate cathode material is poor in rate capability and instable in cycle performance are solved. The nominal molecular formula of the cathode material is Na3V2-xCax(PO4)2F3, whereinx is more than 0 and less than or equal to 0.2. The preparation method comprises the following steps: uniformly dissolving a sodium source, a calcium source, a vanadium source, phosphate and a carbonsource into a deionized water medium in a stoichiometric ratio so as to obtain a mixed solution, and drying, so as to obtain a sodium vanadium fluorophosphate precursor, wherein the carbon source is used for controlling a V valence state in a compound; and carrying out thermal treatment on the precursor at 300-400 DEG C in an inert atmosphere, and sintering at 600-700 DEG C, so as to obtain the doped and modified sodium vanadium fluorophosphate cathode material. The material has relatively high ionic conductivity and electronic conductivity and therefore has excellent rate capability; the cycling stability of the material in electrochemical charging and discharging processes are enhanced; and the preparation craft process is simple.

Description

Technical field [0001] The invention belongs to the technical field of preparation of advanced energy storage materials, and specifically relates to a doped modified sodium vanadium fluorophosphate cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic devices and power tools due to their excellent properties such as high voltage, high energy density and long cycle life. In recent years, with the application of lithium-ion batteries in electric vehicles, renewable energy storage and smart grid energy storage, the demand for lithium resources has increased sharply. As the reserves of lithium in the crust are limited and are mostly distributed in plateau areas, it is not easy to develop. Therefore, research and development of other energy storage systems that can replace lithium can promote the rapid development of these fields. Taking into account that sodium and lithium have similar phys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/364H01M4/5825H01M4/626H01M10/054Y02E60/10
Inventor 赵海雷吕扬阳李圆赵丽娜张子佳李兆麟
Owner UNIV OF SCI & TECH BEIJING
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