Manganese dioxide sulfur-carbon positive electrode and preparation method

A technology of manganese dioxide sulfur carbon and manganese dioxide, which is applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of restricting large-scale application, unfavorable industrial production, and cumbersome steps, so as to inhibit the shuttle effect and improve the utilization rate , The effect of simple process

Active Publication Date: 2017-05-10
TIANJIN LISHEN BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these composite materials are either limited by the material itself, or the tedious steps and harsh conditions are not conducive to industrial production, which more or less limits large-scale applications.

Method used

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  • Manganese dioxide sulfur-carbon positive electrode and preparation method
  • Manganese dioxide sulfur-carbon positive electrode and preparation method
  • Manganese dioxide sulfur-carbon positive electrode and preparation method

Examples

Experimental program
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Embodiment 1

[0030] 1) Choose elemental sulfur S 8 React with carbon nanotube powder CNT, sieve sulfur powder 100-200 mesh to obtain sulfur powder, mix with carbon nanotube CNT at a weight ratio of 7:3, put it in a reaction kettle, and react at a high temperature of 155°C for 6 Hour, take out after natural cooling, obtain sulfur-carbon composite material, stand-by;

[0031] 2) With nitrogen methylpyrrolidone NMP as a solvent, the solvent and dry powder are sulfur-carbon composite materials, fine sulfur powder, manganese dioxide, and binder (6% in this embodiment) in a weight ratio of 60:10:20:10 Polyvinylidene fluoride PVDF emulsion) mixing, proportioning slurry, and homogeneous;

[0032] 3) Coating the aluminum foil of the positive electrode current collector with a thickness of 150 microns, and drying in a furnace at 80°C-130°C to obtain a lithium-sulfur battery positive electrode with a manganese dioxide sulfur carbon core-shell structure Pole piece;

[0033] 4) Sublimating the posit...

Embodiment 2

[0036] The preparation method of Example 2 is the same as that of Example 1, except that the weight ratio of the sulfur-carbon composite material, sulfur powder, manganese dioxide, and binder in step 2) is 40:10:40:10.

[0037] Figure 4 The scanning electron microscope picture of the lithium-sulfur battery positive electrode sheet with the primary manganese dioxide sulfur carbon core-shell structure prepared in Example 2. Figure 4 It is shown that the sulfur / CNT material is evenly coated on the surface of manganese dioxide, forming a primary manganese dioxide sulfur carbon core-shell structure. Figure 5 The scanning electron microscope picture of the lithium-sulfur battery positive electrode sheet with the secondary manganese dioxide sulfur carbon core-shell structure prepared in Example 2. Depend on Figure 5The microstructure of the lithium-sulfur battery positive electrode sheet is composed of: manganese dioxide is used as a structural support to fix the sulfur-carbon ...

Embodiment 3

[0039] Embodiment 3: the preparation method of embodiment 3 is the same as that of embodiment 1, the only difference is that the ratio of sulfur powder and conductive agent powder graphene in step 1) is: 1:1. The manganese dioxide sulfur carbon core-shell structure composite material button battery prepared by the method has a capacity of up to 220.1 mAh / g, wherein the capacity of the sulfur S8 can reach 680.5 mAh / g.

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Abstract

The invention belongs to the field of lithium battery preparation, and specifically relates to a manganese dioxide sulfur-carbon positive electrode and a preparation method. The preparation method comprises the following steps: 1) adopting a vapor deposition method, and uniformly mixing sublimed sulfur powder and conductive agent powder to obtain a sulfur-carbon composite material; 2) mixing the sulfur-carbon composite material obtained in the step 1), powdered sulfur, manganese dioxide, a dispersing agent and a binder, using 1-methyl-2-pyrrolidinone (NMP) as a solvent, sufficiently and uniformly stirring to obtain a mixed sizing agent; 3) uniformly coating the mixed sizing agent on the surface of a positive electrode current collector to form a positive electrode coating layer, then heating and drying at the temperature of 60 to 130 DEG C so as to obtain a primary manganese dioxide sulfur-carbon core-shell structure positive electrode; and 4) heating the pole piece of the primary manganese dioxide sulfur-carbon core-shell structure positive electrode obtained in the step 3) in a nitrogen environment, and carrying out in situ sublimation so that sulfur grows on a sulfur-carbon shell of the primary manganese dioxide sulfur-carbon core-shell structure to complete sulfur fixation, and thus forming a secondary manganese dioxide sulfur-carbon core-shell structure.

Description

technical field [0001] The invention belongs to the field of lithium battery preparation, and in particular relates to a manganese dioxide sulfur carbon positive electrode and a preparation method. Background technique [0002] In recent years, lithium-ion batteries have been widely used in various consumer electronics products, new energy vehicles, and energy storage systems. Lithium-sulfur batteries use sulfur as the positive electrode and lithium as the negative electrode. Compared with traditional lithium-ion batteries, the sulfur positive electrode has the advantage of high energy density, with a theoretical value of 1670mAh / g. And sulfur is basically non-polluting to the environment, abundant in nature, cheap and non-toxic, and has broad development prospects as a cathode material for a new generation of lithium-ion batteries. [0003] Although lithium-sulfur batteries have the above advantages, they also have many problems. Sulfur is basically non-conductive at room ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/131H01M4/505
CPCH01M4/131H01M4/1391H01M4/505Y02E60/10
Inventor 高凡孟繁慧姜巍王欣全周江伍绍中刘喜正丁轶
Owner TIANJIN LISHEN BATTERY
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