Doped and modified sodium vanadium fluorophosphate cathode material and preparation method thereof

A technology of sodium vanadium fluorophosphate and positive electrode materials, which is applied in the field of doped and modified sodium vanadium fluorophosphate positive electrode materials and its preparation, and can solve problems such as unfavorable industrialization and other production technologies, low charge-discharge specific capacity, and complicated process , to achieve the effect of being conducive to transmission, excellent rate performance, and increasing the transportation channel

Active Publication Date: 2018-03-20
UNIV OF SCI & TECH BEIJING
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  • Summary
  • 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 ...

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  • Doped and modified sodium vanadium fluorophosphate cathode material and preparation method thereof
  • Doped and modified sodium vanadium fluorophosphate cathode material and preparation method thereof
  • Doped and modified sodium vanadium fluorophosphate cathode material and preparation method thereof

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Embodiment 1

[0027] A method for preparing a doped modified sodium vanadium phosphate positive electrode material, comprising:

[0028] (1) Take 1.072g citric acid, mix 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 O was weighed according to the molar ratio of 3:1.95:0.05:2:1.6, and then 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) Place the above precursor solution at 80 ○ After drying in a blast oven for 18 hours, the precursor was ground in a mortar; the above-mentioned precursor was heated at 350 ○ C heat treatment for 4 hours, 650 ○ C sintering and heat preservation for 8 hours to obtain doped modified sodium vanadium fluorophosphate cathode material Na 3 V 1.95 Ca 0.05 (PO 4 ) 2 f 3 . The prepared calcium-doped vanadium vanadium phosphate was used as the positive electrode material of sodium ion battery for electr...

Embodiment 2

[0031] A method for preparing a doped modified sodium vanadium phosphate positive electrode material, comprising:

[0032] (1) Take 2 g of citric acid, mix NaF, NH 4 VO 3 , Ca(OH) 2 , NH 4 h 2 PO 4 and C 6 h 8 o 7 ·H 2 O was weighed according to the molar ratio of 3:1.95:0.05:2:3, then 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) Place the above precursor solution at 120 ○ Dry in C blast drying oven for 6 hours, and grind in a mortar to obtain a precursor; ○ C heat treatment for 5 hours, 700 ○ C sintering and heat preservation for 6 hours to obtain doped modified sodium vanadium fluorophosphate cathode material Na 3 V 1.9 Ca 0.1 (PO 4 ) 2 f 3 . The prepared calcium-doped vanadium vanadium phosphate was used as the positive electrode material of sodium ion battery for electrochemical performance test. The metal sodium sheet is used a...

Embodiment 3

[0035] A method for preparing a doped modified sodium vanadium phosphate positive electrode material, comprising:

[0036] (1) Take 1.072 g citric acid, mix NaF, NH 4 VO 3 , CaCO 3 , NH 4 h 2 PO 4 and C 6 h 8 o 7 ·H 2 O was weighed according to the mass ratio of 3:1.9:0.1:2:1.6, and then added to 40 ml 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) Dry the above precursor solution in a blast drying oven at 80 °C for 18 hours, and grind it in a mortar to obtain the precursor; place the above precursor in a high-purity argon atmosphere at 400 ○ C heat treatment for 5 hours, 600 ○ C sintering and heat preservation for 8 hours to obtain doped modified sodium vanadium fluorophosphate cathode material Na 3 V 1.8 Ca 0.2 (PO 4 ) 2 f 3 . The prepared calcium-doped vanadium vanadium phosphate was used as the positive electrode material of sodium ion battery for...

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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 in particular 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 dramatically. Since the reserves of lithium in the earth's crust are limited and are mostly distributed in plateau areas, it is not easy to develop. Therefore, the research and development of other energy storage systems that can replace lithium can promote the rapid development of these fields. Considering that sodium and lithium...

Claims

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Application Information

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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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