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A kind of vanadium sodium fluorophosphate coated sodium ferric phosphate pyrophosphate composite material and its preparation method and application

A technology for coating sodium ferric phosphate pyrophosphate with sodium vanadium fluorophosphate, and coating sodium ferric phosphate pyrophosphate with sodium vanadium phosphate is applied in the field of battery cathode material preparation, and can solve the problem of poor cycle stability and poor phase transition of sodium ferric phosphate pyrophosphate materials. Stability, slow ion diffusion and other problems, to achieve the effect of good phase stability, improved thermal stability and chemical stability, and fast ion transmission

Active Publication Date: 2022-04-15
深圳市津工能源有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the above-mentioned technical problems existing in the prior art, the present invention provides a sodium ferric pyrophosphate composite material coated with vanadium sodium fluorophosphate, which can effectively solve the problem of The sodium ferric phosphate pyrophosphate material itself has the problems of unstable phase transition, slow ion diffusion and poor cycle stability. Its application in the battery can make the battery have a high working voltage, good stability and excellent electrochemical performance.

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  • A kind of vanadium sodium fluorophosphate coated sodium ferric phosphate pyrophosphate composite material and its preparation method and application
  • A kind of vanadium sodium fluorophosphate coated sodium ferric phosphate pyrophosphate composite material and its preparation method and application
  • A kind of vanadium sodium fluorophosphate coated sodium ferric phosphate pyrophosphate composite material and its preparation method and application

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Embodiment 1

[0041] A preparation method of sodium ferric pyrophosphate composite material coated with sodium vanadium fluorophosphate, comprising the following steps:

[0042] S1. Disperse 0.01mol sodium pyrophosphate, 0.03mol ferrous oxalate, 0.02mol ammonium dihydrogen phosphate and 0.01mol citric acid in 100mL 200g / L tetraethylene glycol aqueous solution, stir at 500r / min speed for 3h and mix well Transfer to the reaction kettle, conduct hydrothermal reaction at 200°C for 5h, after the reaction is completed, filter and freeze-dry in vacuum at -20°C for 20h to obtain the precursor of sodium iron phosphate pyrophosphate;

[0043] S2, the sodium ferric pyrophosphate precursor obtained in step S1 and 3mmol sodium fluoride, 2mmol ammonium metavanadate, 2mmol ammonium dihydrogen phosphate and 0.5mmol citric acid are dispersed in the polyethylene glycol aqueous solution of 100mL 200g / L, After stirring at 500 r / min for 3 hours, the mixture was transferred to the reaction kettle, and the hydrot...

Embodiment 2

[0050] A preparation method of sodium ferric pyrophosphate composite material coated with sodium vanadium fluorophosphate, comprising the following steps:

[0051] S1. Disperse 0.01mol sodium pyrophosphate, 0.031mol ferrous oxalate, 0.021mol ammonium dihydrogen phosphate and 0.01mol citric acid in 100mL 200g / L tetraethylene glycol aqueous solution, stir at 500r / min speed for 3h and mix well Transfer to the reaction kettle, conduct hydrothermal reaction at 200°C for 5h, after the reaction is completed, filter and freeze-dry in vacuum at -20°C for 20h to obtain the precursor of sodium iron phosphate pyrophosphate;

[0052] S2, the sodium ferric pyrophosphate precursor obtained in step S1 and 3mmol sodium fluoride, 2.1mmol ammonium metavanadate, 2.05mmol ammonium dihydrogen phosphate and 0.5mmol citric acid are dispersed in 100mL 200g / L polyethylene glycol aqueous solution , stir at a speed of 500 r / min for 3 hours and mix well, then transfer to the reaction kettle, and conduct h...

Embodiment 3

[0057] A preparation method of sodium ferric pyrophosphate composite material coated with sodium vanadium fluorophosphate, comprising the following steps:

[0058] S1. Disperse 0.01 mol of sodium pyrophosphate, 0.031 mol of ferrous oxalate, 0.021 mol of ammonium dihydrogen phosphate and 0.01 mol of citric acid in 100 mL of 200 g / L tetraethylene glycol aqueous solution, and stir for 1 h at a speed of 200 r / min. Transfer to the reaction kettle, conduct hydrothermal reaction at 180°C for 3h, after the reaction is completed, filter and freeze-dry in vacuum at -20°C for 10h to obtain the precursor of sodium iron phosphate pyrophosphate;

[0059] S2, the sodium ferric phosphate precursor obtained in step S1 and 3mmol sodium fluoride, 2.1mmol ammonium metavanadate, 2mmol ammonium dihydrogen phosphate and 0.5mmol citric acid are dispersed in the polyethylene glycol aqueous solution of 100mL 200g / L , stirred at a speed of 200r / min for 1h and mixed, then transferred to the reaction kett...

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Abstract

The invention provides a sodium iron phosphate pyrophosphate composite material coated with vanadium sodium fluorophosphate and its preparation method and application. By coating the sodium vanadium fluorophosphate on the surface of sodium iron phosphate pyrophosphate, the sodium iron phosphate pyrophosphate material can be effectively solved. Due to the problems of unstable phase transition, slow ion diffusion and poor cycle stability, its application in batteries can make the batteries have higher working voltage, good stability and excellent electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of battery cathode material preparation, and more particularly, to a composite material of sodium ferric pyrophosphate coated with sodium vanadium fluorophosphate and a preparation method thereof. Background technique [0002] The energy crisis and environmental changes have led to the sustainable development, utilization and storage of energy, which are highly valued by countries all over the world. Lithium-ion batteries have been widely used in various fields and can be used in many fields such as electronic products, aerospace, military and military industries. With the wide application of lithium-ion batteries, especially the rapid development of the electric vehicle market, lithium resources are consumed in large quantities, but the reserves of lithium resources in the earth's crust are low and cannot be the key to large-scale energy storage. Due to its abundant reserves of sodium resources and environ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/58H01M10/054C01B25/455C01B25/45B82Y30/00B82Y40/00
CPCH01M4/62H01M4/628H01M4/366H01M4/5825H01M10/054C01B25/45C01B25/455B82Y30/00B82Y40/00H01M2004/028C01P2004/82C01P2004/32C01P2006/40C01P2004/03C01P2002/72Y02E60/10
Inventor 纪效波高金强田野侯红帅邹国强
Owner 深圳市津工能源有限公司
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