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Rheological phase method for preparing sodium-doped positive pole material lithium vanadium phosphate of lithium-ion battery

A technology of lithium ion battery and cathode material, applied in battery electrodes, circuits, electrical components, etc., to achieve high discharge voltage, high charge and discharge capacity, and reduce pollution

Inactive Publication Date: 2012-06-27
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

for doping Li 3 V 2 (PO 4 ) 3 The metal ions of the material mainly include Al 3+ , Fe 3+ 、Cr 3+ , Y 3+ and Ge 4+ etc., and there are few reports about sodium doping, the present invention adopts rheological phase reaction method, through sodium doping to Li 3 V 2 (PO 4 ) 3 The influence of the electrochemical performance on the

Method used

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  • Rheological phase method for preparing sodium-doped positive pole material lithium vanadium phosphate of lithium-ion battery
  • Rheological phase method for preparing sodium-doped positive pole material lithium vanadium phosphate of lithium-ion battery
  • Rheological phase method for preparing sodium-doped positive pole material lithium vanadium phosphate of lithium-ion battery

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Effect test

Embodiment 1

[0018] (1) Take 3.0313g vanadium pentoxide (V 2 o 5 ) in the beaker, adding mass percentage concentration is 10% hydrogen peroxide 30ml, stirs with glass rod, forms vanadium pentoxide hydrogel (V 2 o 5 ·nH 2 O);

[0019] (2) Add 6.493g of diammonium hydrogen phosphate 6.493g, 2.063g of lithium hydroxide monohydrate 2.063g, 0.1100g of sodium salt and 0.1000g of high molecular weight PEG35000 to the product obtained in step (1), and ultrasonically vibrate for 5 minutes;

[0020] (3) Use a 5ml pipette to measure 1.05ml of analytically pure small molecular weight PEG200 into a beaker vibrated by ultrasonic waves, transfer it to a round bottom flask, and evaporate it to dryness on a rotary evaporator at 40°C for 1 hour, and then dry it in a vacuum. Dry in the oven 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 650°C under the protection of high-purity argon for 10 hours, a...

Embodiment 2

[0024] (1) Take 3.0313g vanadium pentoxide (V 2 o 5 ) in the beaker, adding mass percentage concentration is 30% hydrogen peroxide 30ml, stirs with glass rod, forms vanadium pentoxide hydrogel (V 2 o 5 ·nH 2 O);

[0025] (2) Add 6.493g of diammonium hydrogen phosphate 6.493g, 2.063g of lithium hydroxide monohydrate 2.063g, 0.1100g of sodium salt and 0.1g of high molecular weight PEG20000 to the product obtained in step (1), and ultrasonically vibrate for 5 minutes;

[0026] (3) Use a 5ml pipette to measure 2.05ml of analytically pure small molecular weight PEG600 into a beaker vibrated by ultrasonic waves, transfer it to a round bottom flask, and evaporate it to dryness on a rotary evaporator at 50°C for 0.5 hours, and then dry it in a vacuum. 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 850°C under the protection of high-purity argon for 20 hours, an...

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Abstract

The invention discloses a rheological phase method for preparing sodium-doped positive pole material lithium vanadium phosphate of a lithium-ion battery. The aqueous solution of hydrogen peroxide and vanadium pentoxide are mixed and react to obtain vanadium pentoxide hydrogel; and the vanadium pentoxide hydrogel, diammonium hydrogen phosphate, lithium hydroxide monohydrate, sodium salt and polyethylene glycol serve as raw materials to synthetize the precursor of the positive pole material Li3-xNaxV2(PO4)3 of the lithium-ion battery in one step. The precursor is calcinated under the protection of inert gas atmosphere, so that V5+ is fully reduced into V3+, and simultaneously a product Li3-xNaxV2(PO4)3 is generated. The rheological phase method for preparing the sodium-doped positive pole material lithium vanadium phosphate of the lithium-ion battery is simple and convenient, easy to control and low in cost; the synthesis process is simplified, the sodium-doped lithium vanadium phosphate Li3V2(PO4)3 has a larger lithium-ion transportation channel, and the conductivity of the Li3V2(PO4)3 can be improved, so that the charging, discharging and rate capability of a sample is improved.

Description

technical field [0001] The invention relates to a lithium vanadium phosphate (Li 3-x Na x V 2 (PO 4 ) 3 ) rheological phase method. Background technique [0002] 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. In the production of lithium batteries, the positive electrode material accounts for about 2 / 3 of the cost. At present, the positive electrode materials mainly include lithium cobalt oxide, lithium nickel oxide and lithium manganese oxide. Monoclinic Li 3 V 2 (PO 4 ) 3 It is an excellent cathode material for lithium-ion batteries, and it has attracted great attention as soon as it appeared. and currently researched hotter LiFePO 4 Similar, Li 3 V 2 (PO 4 ) 3 It has the advantages of high energy density, ab...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/58
CPCY02E60/12Y02E60/10
Inventor 王任衡肖顺华蒋英宝音
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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