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Preparation method of multi-element nanometer sulfur anode material for lithium ion battery

A technology of nanocomposite materials and lithium-ion batteries, which is applied in the preparation/purification of sulfur, battery electrodes, electrical components, etc., can solve problems such as fire, explosion, and high price, and achieve simple process flow, high electrochemical activity, and materials low cost effect

Inactive Publication Date: 2006-07-19
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main problems of lithium cobalt oxide cathode materials are: (1) low thermal stability and poor overcharge resistance, which can cause safety problems such as fire and explosion under high temperature or battery abuse; (2) theoretical specific capacity It is 274mAh / g, and the actual specific capacity is about 140mAh / g, which is relatively low; (3) It is expensive, and the price of metal cobalt in 2004 was about 400,000 yuan / ton
Wang Jiulin et al. (CN02111404.8; CN02111403.3; Adv Mater, 2002,14(13-14): 963) prepared a partially vulcanized composite material by heat treatment at a certain temperature by mixing polyacrylonitrile powder with sublimed sulfur, The specific capacity and cycle performance are better than the above-mentioned polysulfides, but they are still not ideal in terms of electrical conductivity, density, and processing performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] 1. A lithium-ion battery cathode material V 2 o 5 -The preparation method of carbon-sulfur nanocomposite material, this method comprises the following steps successively:

[0024] (1) Weigh a certain amount of ammonium metavanadate or V 2 o 5 , heat it up to 800°C to 900°C to melt, and then quench it in deionized water with vigorous stirring at room temperature to obtain vanadium pentoxide sol.

[0025] (2) Take a certain amount of carbon material, which can be one of acetylene black, carbon black, and activated carbon, and weigh a certain amount of elemental sulfur, which can be sublimed sulfur or high-purity sulfur. Using ethanol as the medium, under the atmosphere of nitrogen or argon, the carbon and the sulfur are ball milled and mixed, and the mass ratio of the carbon to the sulfur is: 0.2:1-1.2:1.

[0026] (3) Place the vanadium pentoxide sol prepared by ball-milling carbon and sulfur mixture in step (2) and the vanadium pentoxide sol prepared in step (1) into...

Embodiment 1

[0036] Embodiment one: take by weighing 30gNH 4 VO 3 Put it into a corundum crucible, heat it up to 850°C in a muffle furnace for 3 hours to melt, keep it warm for 1 hour, and quench it in deionized water that is vigorously stirred at room temperature to prepare V 2 o 5 Sol; Weigh 10g carbon black, 20g sublimated sulfur, 20ml absolute ethanol and place them in the stainless steel container of the ball mill, the grinding balls are stainless steel balls, under nitrogen protection, the rotating speed of the ball mill is 500 rpm, and the ball milling time is 20 hours; after ball milling The materials and the produced V 2 o 5 The sol is placed in a mechanically stirred mixer with a volume of 1 liter, a stirring speed of 2000 rpm, and a stirring time of 1 hour; the stirred and mixed materials are transferred to a disk, placed in a muffle furnace, and heated in air Drying at 80°C under atmosphere; place the dried material in an atmosphere protection furnace, heat treatment at a c...

Embodiment 2

[0038] Embodiment two: take by weighing 50gNH 4 VO 3 Put it into a corundum crucible, heat it up to 900°C in a muffle furnace for 3 hours and melt it, keep it warm for 1 hour, and quench it in deionized water that is vigorously stirred at room temperature to prepare V 2 o 5 Sol; Weigh 4g carbon black, 20g high-purity sulfur and 20ml absolute ethanol and carry out ball milling; heat treatment condition is changed into 200 ℃ constant temperature 3 hours at 200 ℃ constant temperature 3 hours by the 250 ℃ constant temperature of embodiment one; Other conditions are identical with embodiment one, make Got V 2 o 5 - Carbon black-sulfur nanocomposites. The discharge specific capacity of the second cycle of the sample measured by the same test method as in Example 1 was 550mAh / g, and the discharge capacity of the 20th cycle was 543mAh / g.

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Abstract

The preparation method for nano composite anode material of V2O5-carbon-sulphur and LiVO3-carbon-sulphur comprises: using NH4VO3 or V2O5 as material to prepare V2O5 sol; grinding and mixing the carbon material (acetylene black, acetylene black or active carbon) and elemental sulfur; dispersing the said mixture into V2O5 sol; drying and thermal treating to obtain the nano V2O5-carbon-sulphur composite material; or dispersing the mixture into V2O5 sol contained LiOH to final obtain another LiVO3-carbon-sulphur composite material. Both the products have high electrochemical activity and high density. This invention has simple process and low cost.

Description

technical field [0001] The invention relates to a preparation method of a multi-element nano-sulfur composite cathode material for a lithium ion battery, in particular to a preparation method of a vanadium pentoxide-carbon-sulfur nanocomposite cathode material and a lithium vanadate-carbon-sulfur nanocomposite cathode material, belonging to chemical engineering And the technical field of new material preparation method. Background technique [0002] Lithium-ion battery is a new type of high-energy secondary battery that began to be put into practical use in the 1990s. It has outstanding advantages such as high voltage, high energy density, good cycle performance, small self-discharge, and no memory effect. It has been widely used in mobile phones and notebooks. Computers, digital products, electric tools and other portable equipment fields. As the power source of electric vehicles and hybrid vehicles, lithium-ion batteries have shown good application prospects and great app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02C01B31/08C01B17/02H01M4/48H01M4/58
CPCY02E60/10
Inventor 姜长印万春荣何向明应皆荣李建军王莉任建国
Owner TSINGHUA UNIV
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