Lithium vanadium fluorophosphate-lithium vanadyl phosphate composite positive electrode material, 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 easy access to raw materials

Active Publication Date: 2021-06-15
DALIAN RONGKE ENERGY STORAGE GRP CO LTD
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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, preparation method and application thereof
  • Lithium vanadium fluorophosphate-lithium vanadyl phosphate composite positive electrode material, 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, compress the pre-calcined precursor and place it in the 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) Analysis...

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), followed by adding dispersant and carrying out high-energy ball milling, vacuum at 120°C After drying, the pre-calcined 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-i...

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Abstract

The invention provides a lithium vanadium fluorophosphate-lithium vanadyl phosphate composite positive electrode material, its preparation method and application. The general formula of the lithium vanadium fluorophosphate-lithium vanadyl oxyphosphate composite positive electrode material is: xLiVOPO 4 ·LiVPO 4 F, where 0.05≤x≤0.40. The preparation method of lithium vanadium phosphate-lithium vanadyl phosphate composite positive electrode material comprises the following steps: weighing lithium source, vanadium source, phosphorus source and fluorine source according to the general formula, and mixing; adding additive, carbon source and dispersant to the mixture Grinding and drying in vacuum to obtain non-crystalline roasted precursor powder; pressing non-crystalline roasted precursor powder into tablets and sintering in a non-reducing atmosphere, and obtaining lithium vanadium phosphate-lithium vanadyl phosphate composite positive electrode material after cooling down . The material of the invention can be prepared by high-temperature calcination in an air atmosphere, and while reducing the usage amount of raw material fluorine salt, it still maintains relatively high voltage and capacity of lithium vanadium phosphate.

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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Patent Type & Authority Patents(China)
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 DALIAN RONGKE ENERGY STORAGE GRP CO LTD
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