Rheological phase method for modifying lithium ion cathode material Li3V2(PO4)3 by adopting PEG composite system

A positive electrode material and rheological phase technology, applied in the field of rheological phase, to achieve high charge and discharge capacity, good cycle performance, and reduce pollution

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

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Problems solved by technology

[0003] At present, Li-ion secondary battery cathode material Li 3 V 2 (PO 4 ) 3 Doping modification and single-component PEG are mostly used, but there are few reports on modification with PEG composite system

Method used

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  • Rheological phase method for modifying lithium ion cathode material Li3V2(PO4)3 by adopting PEG composite system
  • Rheological phase method for modifying lithium ion cathode material Li3V2(PO4)3 by adopting PEG composite system
  • Rheological phase method for modifying lithium ion cathode material Li3V2(PO4)3 by adopting PEG composite system

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Experimental program
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Embodiment 1

[0016] (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);

[0017] (2) Add 6.603g of diammonium hydrogen phosphate, 2.098g of lithium hydroxide monohydrate and 0.1g of high molecular weight PEG10000 to the product obtained in step (1), and ultrasonically vibrate for 8 minutes;

[0018] (3) Use a 5ml pipette to measure 1.5ml of analytically pure small molecular weight PEG200 and add it to the product obtained in step (2), transfer it to a round bottom flask, and evaporate to dryness on a rotary evaporator at 45°C for 1 hour, and then Dry in a vacuum drying oven at 80°C for 4 hours; take it out, grind it into powder with an agate mortar, take the powder in a porcelain boat, and sinter it in a vacuum sintering furnace at 700°C under the protection of high-purity argon for 15 hours. After cooling to room temperature, the pro...

Embodiment 2

[0022] (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);

[0023] (2) Add 6.603g of diammonium hydrogen phosphate, 2.098g of lithium hydroxide monohydrate and 0.3g of high molecular weight PEG20000 to the product obtained in step (1), and ultrasonically vibrate for 8 minutes;

[0024] (3) Use a 5ml pipette to measure 2ml of analytically pure small molecular weight PEG400 and add it to the product obtained in step (2), transfer it to a round-bottomed flask, and evaporate to dryness on a rotary evaporator at 50°C for 0.5 hour. Dry in a vacuum drying oven at 120°C for 4 hours; take it out, grind it into powder with an agate mortar, take 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, and naturally Cooling to room temperature yields Li 3 ...

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Abstract

The invention relates to a rheological phase method for modifying a lithium ion cathode material Li3V2(PO4)3 by adopting a PEG composite system. The rheological phase method comprises the steps of: mixing an aqueous hydrogen peroxide solution with vanadium pentoxide for reacting to obtain a vanadium pentoxide hydrogel; further synthesizing a precursor of the lithium ion cathode material Li3V2(PO4)3 by using the vanadium pentoxide hydrogel, diammonium hydrogen phosphate, lithium hydroxide and polyethylene glycol as raw materials; and roasting the precursor on the protection of an inert gas to ensure that V<+> is completely reduced into V<3+> and a product Li3V2(PO4)3 is generated. The rheological phase method has the characteristics of convenience, simpleness, easy control and low cost; and synthesis processes are simplified and charge and discharge properties and cycle performance of a sample are improved.

Description

technical field [0001] The invention relates to a lithium vanadium phosphate lithium ion secondary battery cathode material (Li 3 V 2 (PO 4 ) 3 ) modified 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 the currently researched hotter LiPePO 4 Similar, Li 3 V 2 (PO 4 )...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 王任衡肖顺华宝音蒋英
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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