Lithium vanadium fluorophosphate-lithium vanadyl phosphate composite positive electrode material as well as preparation method and application thereof

A composite positive electrode material, lithium vanadyl phosphate technology, applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., can solve the problems of reducing the use of raw material fluorine salts and high production costs, and achieve the difficulty of simplifying the calcination process and comprehensive production The effect of low cost and good electrochemical performance

Active Publication Date: 2020-03-27
大连融科储能集团股份有限公司
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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 propose a lithium vanadium phosphate-lithium vanadyl phosphate composite positive electrode material for the high cost of lithium vanadium phosphate lithium ion battery positive electrode material and the need for inert gas protection during the calcination preparation process. Prepared by high-temperature calcination in an air atmosphere, while reducing the amount of raw material fluorine salt used, it still maintains a high voltage and capacity of lithium vanadium phosphate

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  • Lithium vanadium fluorophosphate-lithium vanadyl phosphate composite positive electrode material as well as preparation method and application thereof
  • Lithium vanadium fluorophosphate-lithium vanadyl phosphate composite positive electrode material as well as preparation method and application thereof

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Embodiment 1

[0027] This embodiment discloses a preparation method of lithium vanadium phosphate-lithium vanadyl phosphate, a composite cathode material for a lithium ion battery, comprising the following steps:

[0028] Lithium carbonate, vanadium pentoxide, ammonium dihydrogen phosphate and lithium fluoride are mixed at a molar ratio of Li:V:P:F=1.15:1.15:1.15:1 to prepare composite material component 0.15LiVOPO 4 ·LiVPO 4 F, then add tributyl borate of 3% of the total mass of the mixture and 30% glucose and 10% citric acid by mass fraction, then add a dispersant for high-energy ball milling, vacuum dry at 120°C, and press the pre-calcined precursor into tablets and place The sintering treatment was carried out under air atmosphere, the sintering temperature was 650°C, the holding time was 3h, and the lithium vanadium phosphate-lithium vanadyl phosphate composite positive electrode material was obtained after natural cooling.

[0029] From the XRD spectrum (such as figure 1 Shown) Anal...

Embodiment 2

[0032] This embodiment discloses a preparation method of lithium vanadium phosphate-lithium vanadyl phosphate, a composite cathode material for a lithium ion battery, comprising the following steps:

[0033] Lithium carbonate, vanadium phosphate and lithium fluoride are mixed at a molar ratio Li:V:P:F=1.15:1.15:1 to prepare composite material component 0.30LiVOPO 4 ·LiVPO 4 F, then adding tributyl borate and mass fraction of 7% of the total mass of the mixture are 20% glucose and 5% graphene conductive paste (5% ethanol system by mass fraction), then add dispersant and carry out high-energy ball milling, 120 ℃ vacuum After drying, the pre-calcination body was pressed into tablets, and then placed in an air atmosphere for sintering treatment. The sintering temperature was 550 ° C, and the holding time was 3 hours. After natural cooling, the lithium vanadium phosphate-lithium vanadyl phosphate composite positive electrode material was obtained.

[0034] A lithium-ion button bat...

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Abstract

The invention provides a lithium vanadium fluorophosphate-lithium vanadyl phosphate composite positive electrode material as well as a preparation method and application thereof, the general formula of the lithium vanadium fluorophosphate-lithium vanadyl phosphate composite positive electrode material is xLiVOPO4. LiVPO4F, and x is more than or equal to 0.05 and less than or equal to 0.40. The preparation method of the lithium vanadium fluorophosphate-lithium vanadyl phosphate composite positive electrode material comprises the following steps of weighing a lithium source, a vanadium source, aphosphorus source and a fluorine source according to a general formula, and performing mixing; adding an additive, a carbon source and a dispersing agent into the mixture for grinding, and performingvacuum drying to obtain amorphous roasting precursor powder; tabletting the amorphous roasting precursor powder, sintering in a non-reducing atmosphere, and cooling to obtain the lithium vanadium fluorophosphate-lithium vanadyl phosphate composite positive electrode material. The material can be prepared through high-temperature calcination in an air atmosphere, and high voltage and capacity of lithium vanadium fluorophosphate are still maintained while the usage amount of the raw material villiaumite is reduced.

Description

technical field [0001] The invention relates to lithium ion battery positive electrode material technology, in particular to a lithium vanadium phosphate-lithium vanadyl phosphate composite positive electrode material, its preparation method and application. Background technique [0002] Lithium vanadium fluorophosphate (LiVPO 4 F), is a new lithium-ion battery cathode material of a triclinic crystal system. As a phosphate polyanion cathode material, LiVPO 4 F has the advantages of safe polyanionic structural materials, small structural changes during charging and discharging, and good cycle stability. Simultaneously LiVPO 4 F has a higher potential plateau (4.2V v.s.Li / Li + ), and higher theoretical specific capacity (156mAh / g). The electrochemical performance of lithium vanadium phosphate material can be effectively improved by improving the process with materials such as carbon coating, and its actual charge and discharge capacity can reach more than 90% of the theor...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M10/0525
CPCH01M4/364H01M4/582H01M4/5825H01M10/0525H01M2004/028Y02E60/10
Inventor 杜乃旭邸卫利唐雨微王隆菲崔健
Owner 大连融科储能集团股份有限公司
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