Positive electrode material for sulfur-based lithium ion battery and preparation method and application of positive electrode material

A positive electrode material and ion battery technology, applied in electrode manufacturing, battery electrodes, lithium batteries, etc., can solve the problems of poor cycle performance and low specific capacity of lithium-sulfur full batteries, and achieve high energy density, low cost, and high safety Effect

Active Publication Date: 2016-05-25
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the current research on lithium sulfide cathodes cannot solve the problems of poor cycle performance and low specific capacity of lithium-sulfur full batteries, it is very necessary and urgent to seek other special materials or establish special processes to comprehensively improve lithium-sulfur full batteries and other lithium-sulfur batteries. Electrochemical properties

Method used

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  • Positive electrode material for sulfur-based lithium ion battery and preparation method and application of positive electrode material
  • Positive electrode material for sulfur-based lithium ion battery and preparation method and application of positive electrode material

Examples

Experimental program
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Embodiment 1

[0035] (1) Under the protection of argon atmosphere, according to metal lithium powder and sulfur-polyacrylonitrile composite material (the mass ratio of sulfur to polyacrylonitrile is 4:1 (because the sulfur-polyacrylonitrile composite material has been heat-treated, the actual sulfur The content is about 40% to 60%)) and the mass ratio is 1:6. Weigh 100mg of lithium metal powder and 600mg of sulfur-polyacrylonitrile composite material, and according to the ratio of lithium metal powder (mg): electrolyte (ml) = Add 30ml of 1MLiPF dropwise at a ratio of 100:30 6 -EC / DMC (volume ratio 1:1) electrolyte, under the condition of argon atmosphere and electrolyte infiltration, use a planetary ball mill for 3 hours at a speed of 600 rpm; realize the composite of metal lithium powder and sulfur-polyacrylonitrile The materials are evenly mixed, and finally lithiated for 48 hours under the protection of argon at 25°C to obtain a highly lithiated positive electrode material;

[0036] (2)...

Embodiment 2

[0041] (1) The sulfur-based active material (sulfur-polyacrylonitrile composite material (the mass ratio of sulfur to polyacrylonitrile is 4:1 (because the sulfur-polyacrylonitrile composite material has been heat-treated, the actual sulfur content is about 40% to 60%)), the conductive agent SuperP and the binder polyvinylidene fluoride (PVDF) are mixed in a mass ratio of 8:1:1, and the nitrogen methyl pyrrolidone solvent is dropped to form a slurry, which is evenly coated on the surface containing On the carbon aluminum foil current collector, the coating thickness of the slurry is 0.08mm. After drying at 60°C for 6 hours, it is rolled at 5Mpa and cut into positive electrodes;

[0042] (2) Under the protection of an argon atmosphere, according to the mass ratio of the metal lithium powder and the sulfur-polyacrylonitrile composite material in step 1, the ratio of 1:6, the metal lithium powder is evenly coated on the step by using the coating method. On the sulfur-based positi...

Embodiment 3

[0046] Others are the same as Example 1, except that in step 1, the positive electrode active material is a sulfur-polypyrrole composite material (the mass ratio of sulfur to polypyrrole is 2:1 (because the sulfur-polypyrrole composite material has been heat-treated, the actual sulfur The content is about 45% to 65%)); the current collector is nickel foam, and the coating thickness of the slurry is 0.1mm; it is ball milled with a planetary ball mill at a speed of 600 rpm under the condition of argon atmosphere and electrolyte infiltration 1h; realize the uniform mixing of metal lithium powder and sulfur-polypyrrole composite material, and finally obtain a highly lithiated positive electrode material after 12 hours of lithiation time under the condition of argon protection and 25°C.

[0047] The lithium-sulfur full battery prepared in this example was tested for battery charge and discharge cycle performance through the Xinwei BTS-5V5mA channel, and the first discharge specific ...

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Abstract

The invention relates to a positive electrode material for a sulfur-based lithium ion battery and a preparation method and application of the positive electrode material. During the preparation process of the positive electrode material for the sulfur-based lithium ion battery, a sulfur positive electrode material is lithiated with metal lithium powder; under the protection of an inert atmosphere, the metal lithium powder and a sulfur-based positive electrode such as a sulfur-carbon based composite material or a sulfur-polymer composite material are uniformly mixed by a ball milling method or a coating method; and a certain amount of an electrode is dropwise added into the mixture, and a high-lithiation positive electrode material is obtained after appropriate lithiation time. From the angle of the lithiated sulfur positive electrode, a metal lithium negative electrode is substituted to provide a lithium source, the usage and production cost of a lithium-sulfur battery is saved, meanwhile, the dendrite crystal problem brought by the metal lithium serving as the negative electrode is avoided, and thus, the safety of a lithium-sulfur battery system is improved.

Description

technical field [0001] The technical solution of the invention relates to the preparation of a positive electrode material for a sulfur-based lithium ion battery, and a rechargeable and dischargeable sulfur-based lithium ion battery (or lithium-sulfur full battery) using the material. Background technique [0002] With the development of society, the demand for energy storage power sources such as electric vehicles and mobile phones is constantly increasing, and the traditional commercialized secondary batteries are gradually unable to meet their development requirements due to the limitation of the capacity of the positive electrode material. At the same time, lithium-sulfur batteries due to their high 1675mAhg -1 Theoretical specific capacity and 2600Whkg -1 The theoretical specific energy has become a research hotspot for many companies and laboratories. In addition, lithium-sulfur batteries also have many advantages such as abundant positive sulfur reserves, relatively ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/13H01M4/139H01M4/04H01M10/052H01M10/058
CPCH01M4/0404H01M4/13H01M4/139H01M4/362H01M10/052H01M10/058Y02E60/10Y02P70/50
Inventor 张永光刘心怡殷福星
Owner HEBEI UNIV OF TECH
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