Preparation method of lithium vanadium phosphate and fluorination lithium vanadium phosphate composite positive pole material

A technology of fluorinated lithium vanadium phosphate and composite cathode material, which is used in battery electrodes, electrical components, circuits, etc.

Active Publication Date: 2015-04-29
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although about Li 3 V 2 (PO 4 ) 3 and LiVPO 4 There are many researches on the modification of F electrode materials, and a relatively single modification method cannot effectively improve the Li

Method used

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  • Preparation method of lithium vanadium phosphate and fluorination lithium vanadium phosphate composite positive pole material
  • Preparation method of lithium vanadium phosphate and fluorination lithium vanadium phosphate composite positive pole material

Examples

Experimental program
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Embodiment 1

[0019] (1) Weigh vanadium pentoxide, aluminum nitrate, ammonium dihydrogen phosphate, and sucrose according to the molar ratio of V:Al:P:C of 0.95:0.05:1:2.0. After dispersing and grinding with alcohol, vacuum drying and sintering under nitrogen atmosphere, the sintering temperature is 700°C, the holding time is 10h, and the carbon pre-coated, Al ion-doped V 0.95 AL 0.05 PO 4 / C precursor;

[0020] (2) According to the stoichiometric ratio V 0.95 m 0.05 PO 4 / C:Li:F:P:C=1.2:0.6:0.8:0.2:0.2 Weigh the V obtained in step (1) 0.95 AL 0.05 PO 4 / C precursor, lithium carbonate, LiF, NH 4 h 2 PO 4 As well as the graphene conductive paste, the ball milling dispersion treatment is also carried out in alcohol, and the sintering treatment is carried out under a nitrogen atmosphere after vacuum drying. The sintering temperature is 650 degrees, and the holding time is 6h. Lithium vanadium phosphate and fluorinated lithium vanadium phosphate composite cathode materials co-modifie...

Embodiment 2

[0022] (1) Weigh ammonium metavanadate, iron nitrate, ammonium dihydrogen phosphate, and phenolic resin according to the molar ratio of V:Fe:P:C of 0.85:0.15:1:1.5. After dispersing and grinding with alcohol, vacuum drying and sintering under nitrogen atmosphere, the sintering temperature is 750°C, the holding time is 6h, and the carbon pre-coated, Fe ion-doped V 0.85 Fe 0.15 PO 4 / C precursor;

[0023] (2) According to the stoichiometric ratio V 0.85 Fe 0.15 PO 4 / C:Li:F:P:C=1.4:1.2:0.6:0.4:0.8 Weigh the V obtained in step (1) 0.85 Fe 0.15 PO 4 / C precursor, lithium hydroxide, LiF, NH 4 h 2 PO 4 As well as the graphene conductive paste, it is also ball-milled and dispersed in alcohol. After vacuum drying, it is sintered in a nitrogen atmosphere. The sintering temperature is 700 degrees, and the holding time is 4h. Lithium vanadium phosphate and fluorinated lithium vanadium phosphate composite cathode materials co-modified by pyrolysis carbon;

Embodiment 3

[0025] (1) Weigh ammonium metavanadate, chromium nitrate, ammonium dihydrogen phosphate, and glucose according to the molar ratio of V:Cr:P:C of 0.9:0.1:1:1.2. After dispersing and grinding with methanol, vacuum drying and sintering under nitrogen atmosphere, the sintering temperature is 800°C, the holding time is 4h, and the carbon pre-coated, Cr ion-doped V 0.9 Cr 0.1 PO 4 / C precursor;

[0026] (2) According to the stoichiometric ratio V 0.9 Cr 0.1 PO 4 / C:Li:F:P:C=1.6:1.8:0.4:0.6:1.0 Weigh the V obtained in step (1) 0.9 Cr 0.1 PO 4 / C precursor, lithium acetate, LiF, NH 4 h 2 PO 4 As well as the graphene conductive paste, the ball mill dispersion treatment is also carried out in methanol, and the sintering treatment is carried out under a nitrogen atmosphere after vacuum drying. The sintering temperature is 750 degrees, and the holding time is 2h. Lithium vanadium phosphate and fluorinated lithium vanadium phosphate composite cathode materials co-modified by pyr...

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Abstract

The invention discloses a preparation method for a lithium vanadium phosphate and fluorination lithium vanadium phosphate composite positive pole material. The preparation method comprises the following steps: (1) preparing a V(1-m)MmPO4/C precursor pre-coated with carbon and mingled with metal ions by a carbon thermal reduction method, wherein the M is Cr<3+>, Al<3+>, Y<3+> and Fe<3+>; (2) performing mixed dispersion on the obtained V(1-m)MmPO4/C precursor and dispersion serosity in which a lithium source, a fluorine source, a phosphorus source and grapheme (FLG) are in a stoichiometric proportion under an alcohol system so as to obtain mixed pulp; (3) after performing drying treatment on the obtained mixed pulp, performing high-temperature sintering treatment under the protection of inert gas so as to obtain the lithium vanadium phosphate and fluorination lithium vanadium phosphate composite positive pole material mingled with the metal ions and jointly modified by the graphene and cracking carbon. According to the invention, the technology is simple, and the obtained lithium vanadium phosphate and fluorination lithium vanadium phosphate composite positive pole material has excellent multiplying power, an excellent cycle performance and a wide application prospect in the field of lithium ion batteries.

Description

technical field [0001] The invention relates to the technical fields of power lithium ion batteries and energy storage lithium ion batteries, in particular to a preparation method of lithium vanadium phosphate and fluorinated lithium vanadium phosphate composite cathode materials. Background technique [0002] Fossil fuels are the foundation of today's energy economy, but the continuous rise in global oil demand, the continuous depletion of non-renewable resources, and the political turmoil in oil-exporting countries have brought instability to global new energy security. Therefore, the development and use of clean energy is increasingly urgent, and it is especially important in the fields of energy storage and transportation. Lithium-ion batteries have been widely used and studied as an energy storage tool. The development of lithium-ion batteries is mainly the development of cathode materials. At present, lithium-ion cathode materials have their own defects that need to b...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/36H01M4/62
CPCH01M4/364H01M4/5805H01M4/62Y02E60/10
Inventor 杨茂萍刘兴亮
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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