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Preparation method of sodium vanadium phosphate sodium ion battery composite material

A sodium vanadium phosphate ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of rate performance and cycle performance limitations, low electronic conductivity, etc., to prevent structural collapse and shedding, and simple operation , the effect of enhancing toughness

Active Publication Date: 2019-08-23
GUANGDONG POWER GRID CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention provides a method for preparing a sodium vanadium phosphate sodium ion battery composite material, which can effectively solve the problem that the electronic conductivity of the existing sodium vanadium phosphate battery material is relatively low, causing its rate performance and cycle performance to be greatly affected. Limited Technical Issues

Method used

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  • Preparation method of sodium vanadium phosphate sodium ion battery composite material
  • Preparation method of sodium vanadium phosphate sodium ion battery composite material
  • Preparation method of sodium vanadium phosphate sodium ion battery composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) According to the molar ratio of Na:V:P=3.05:2:3, weigh 122g sodium hydroxide, 182g vanadium pentoxide, 447.3g ammonium phosphate, ball mill for 0.5h, and dry to obtain sodium vanadium phosphate precursor powder ;

[0033] (2) The sodium vanadium phosphate precursor powder was pre-sintered at 400°C for 8 hours in a nitrogen atmosphere, and then sintered at 850°C for 10 hours to obtain the positive electrode material sodium vanadium phosphate;

[0034] (3) According to the mass fraction of 5% sodium vanadium phosphate, dissolve 40.03g of citric acid in deionized water, then add 300g of sodium vanadium phosphate powder, stir in a water bath at 20°C for 1h, after the dispersion is uniform, continue to evaporate at 80°C Until a gel is formed, dried and ground to obtain a mixed powder.

[0035] (4) According to the molar ratio of elements S:F:C=0.05:0.03:1, weigh 1.6g of sulfur powder and 0.975g of polyvinylidene fluoride, grind them together with 240g of mixed powder, a...

Embodiment 2

[0041] 1) According to the molar ratio of Na:V:P=3:2:3.05, weigh 159g of sodium carbonate, 101.9g of vanadium powder, and 350.8g of ammonium dihydrogen phosphate, ball mill for 3 hours, and dry to obtain sodium vanadium phosphate precursor powder;

[0042]2) Pre-sintering the sodium vanadium phosphate precursor powder in an argon atmosphere at 550° C. for 2 hours, and then sintering at 900° C. for 6 hours to obtain sodium vanadium phosphate as a positive electrode material;

[0043] 3) According to the mass fraction of 10% sodium vanadium phosphate, dissolve 52.91g of Tween 20 in deionized water, then add 300g of sodium vanadium phosphate powder, stir in a water bath at 40°C for 0.5h, after the dispersion is uniform, continue to disperse at 100°C Evaporate to form a gel, dry and grind to obtain a mixed powder.

[0044] 4) According to the molar ratio of elements N:Se:C=0.1:0.05:1, weigh 12.01g of urea and 7.90g of selenium powder, grind them together with 240g of mixed powder,...

Embodiment 3

[0048] 1) According to the molar ratio of Na:V:P=3.05:2.02:3.02, weigh 259.22g of sodium nitrate, 236.30g of ammonium metavanadate, and 398.82g of diammonium hydrogen phosphate, ball mill for 2 hours, and dry to obtain the precursor of sodium vanadium phosphate powder;

[0049] 2) The sodium vanadium phosphate precursor powder was pre-sintered at 450°C for 5 hours in an argon-hydrogen mixed gas atmosphere, and then sintered at 650°C for 15 hours to obtain the positive electrode material sodium vanadium phosphate;

[0050] 3) According to the mass fraction of 20% sodium vanadium phosphate, dissolve 79.02g of stearic acid in ethanol, then add 300g of sodium vanadium phosphate powder, stir in a water bath at 80°C for 3h, after the dispersion is uniform, continue to evaporate at 90°C to A gel is formed, dried and ground to obtain a mixed powder.

[0051] 4) According to the molar ratio of elements F:S:N:C=0.03:0.05:0.06:1, weigh 3.9g polyvinylidene fluoride, 6.4g sulfur powder, 7...

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Abstract

The invention relates to the technical field of sodium ion battery materials, and in particular to a preparation method of a sodium vanadium phosphate sodium ion battery composite material. The preparation method provided by the invention comprises the following steps of 1: mixing, ball milling and drying a sodium source, a vanadium source and a phosphorus source to obtain sodium vanadium phosphate precursor powders; 2: pre-sintering and sintering the sodium vanadium phosphate precursor powders is a non-oxidizing atmosphere to obtain sodium ion battery cathode material sodium vanadium phosphate; 3: dissolving a organic carbon source in a dispersant, adding the sodium vanadium phosphate and stirring the mixture in a water bath, evaporating the mixture until a gel is formed, and drying and milling the gel to obtain mixed powders; and 4, mixing and grinding a compound containing the Y element and the mixed powders obtained in the step 3, sintering the mixture at 300 to 500 degrees centigrade for 0.5 to 3 hours to obtain the sodium vanadium phosphate sodium ion battery composite material. The method can solve the technical problem that the existing sodium vanadium phosphate has low electronic conductivity and thus seriously limits its rate performance and cycle performance.

Description

technical field [0001] The invention relates to the technical field of sodium ion battery materials, in particular to a method for preparing a sodium vanadium phosphate sodium ion battery composite material. Background technique [0002] The gradual depletion of traditional fossil fuels has accelerated the development of new renewable and clean energy sources such as solar energy, wind energy, and tidal energy. However, these new energy sources are intermittent in time and discontinuous in geography, and the continuous utilization of energy is greatly restricted. , therefore, the development of energy storage devices becomes more important. Lithium battery, as an efficient energy storage and conversion device, has been widely used in the fields of electronic equipment and power vehicles. However, the limited reserves of lithium resources and the uneven geographical distribution lead to high prices of lithium resources. Sodium element is in the same family as lithium elemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/583H01M10/054
CPCH01M4/366H01M4/583H01M4/388H01M4/38H01M4/5825H01M10/054H01M2004/028Y02E60/10
Inventor 徐凯琪钟国彬王超伍世嘉郑锋华杨成浩
Owner GUANGDONG POWER GRID CO LTD
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