Method for preparing binary doped cathode material lithium vanadium phosphate of lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low conductivity and increase the distance of metal vanadium ions, etc., and achieve the goals of reducing pollution, good cycle performance, and reducing charge transfer resistance Effect

Inactive Publication Date: 2013-05-08
JIANGXI YOULI NEW MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this polyanion structure, larger phosphate ions replace oxygen ions in traditional metal oxide cathode materials, which improves the structural stability of the material on the one hand, but on the other hand increases the gap between metal vanadium ions. distance, reducing the Li 3 V 2 (PO 4 ) 3 electronic conductivity
[0004] Currently, for Li 3 V 2 (PO 4 ) 3 The problem of low conductivity is mainly solved by two methods: surface modification and ion doping.

Method used

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  • Method for preparing binary doped cathode material lithium vanadium phosphate of lithium ion battery
  • Method for preparing binary doped cathode material lithium vanadium phosphate of lithium ion battery
  • Method for preparing binary doped cathode material lithium vanadium phosphate of lithium ion battery

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Embodiment 1

[0019] (1) Take 1.5157 gV 2 o 5 In a beaker, add 30ml of hydrogen peroxide with a concentration of 10% by mass, and stir with a glass rod to form V 2 o 5 ·nH 2 O hydrogel;

[0020] (2) Add 3.2590 g of diammonium hydrogen phosphate, 1.0315 g of lithium hydroxide monohydrate, 0.0528 g of sodium salt, 0.0079 g of fluorine-containing salt and 0.0313 g of high molecular weight PEG35000 to the product obtained in step (1), and oscillate ultrasonically for 5 minutes;

[0021] (3) Use a 5ml pipette to measure 0.625ml of analytically pure low molecular weight PEG200 into a beaker shaken by ultrasonic waves, transfer it to a round bottom flask, and evaporate to dryness on a rotary evaporator at 40°C for 1 hour, then move to vacuum drying Dry in the box at 100°C for 4 hours; take it out, grind it into powder with an agate mortar, put the powder in a porcelain boat, sinter in a vacuum sintering furnace at 700°C under the protection of high-purity argon for 10 hours, and cool naturally...

Embodiment 2

[0025] (1) Take 1.5157 g V 2 o 5 In a beaker, add 30ml of hydrogen peroxide with a concentration of 10% by mass, and stir with a glass rod to form V2 o 5 ·nH 2 O hydrogel;

[0026] (2) Add 3.2590 g of diammonium hydrogen phosphate, 1.0245 g of lithium hydroxide monohydrate, 0.0528 g of sodium salt, 0.0196 g of fluorine-containing salt and 0.0313 g of high molecular weight PEG35000 to the product obtained in step (1), and oscillate ultrasonically for 5 minutes;

[0027] (3) Use a 5ml pipette to measure 0.625ml of analytically pure low molecular weight PEG200 into a beaker shaken by ultrasonic waves, transfer it to a round bottom flask, and evaporate to dryness on a rotary evaporator at 40°C for 1 hour, then move to vacuum drying Dry in the box at 100°C for 4 hours; take it out, grind it into powder with an agate mortar, put the powder in a porcelain boat, sinter in a vacuum sintering furnace at 700°C under the protection of high-purity argon for 10 hours, and cool naturally ...

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Abstract

The invention discloses a method for preparing a binary doped cathode material lithium vanadium phosphate of a lithium ion battery. The method comprises the following steps of: mixing aqueous hydrogen peroxide solution and vanadium pentoxide to react to obtain vanadium pentoxide hydrogel; synthesizing a precursor of the cathode material Li3-xNaxV2(PO4-yFy)3 of the lithium ion battery by one step by using the vanadium pentoxide hydrogel, diammonium hydrogen phosphate, lithium hydroxide monohydrate, sodium salt, fluorine-containing salt and polyethylene glycol as raw materials; and roasting the precursor under the protection of inert gas to facilitate V<5+> to be completely reduced into V<3+> and generate the product Li3-xNaxV2(PO4-yFy)3. The method is simple and convenient, and has the characteristics of easy control and low cost; the synthesis process is simplified, sodium-doped Li3V2(PO4)3 has a larger lithium ion transportation channel, and the body conductivity of Li3V2(PO4)3 can be increased; and besides, by adding a little amount of fluorine, the polarization of the electrode can be reduced, the charge transfer resistance can be reduced, the diffusion rate of Li<+> can be increased, and the charging and discharging performance and the rate capability of the sample are improved finally.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium vanadium phosphate (Li 3-x Na x V 2 (PO 4-y f y ) 3 )Methods. Background technique [0002] The rapid development of the automobile industry has also exacerbated the crisis of energy and environment. According to statistics, 63% of air pollution comes from fuel vehicles, which has prompted the country to increase research and development of electric vehicles and hybrid vehicles. In recent years, due to the relatively high energy density and long cycle life of lithium-ion secondary batteries, they are widely used in various portable electronic products and communication tools, and also have important applications in electric vehicles and energy storage equipment. prospect. At present, lithium-ion battery cathode materials mainly include lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide and nickel-cobalt-manganese ternary materials. Monoclin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/1397H01M4/62
CPCY02E60/122Y02E60/10
Inventor 王任衡王超颜果春齐爱李雪铖徐斌
Owner JIANGXI YOULI NEW MATERIALS
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