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A cathode material for lithium-sulfur batteries bounded by a graphene conductive network for lithium polysulfides

A lithium polysulfide and lithium-sulfur battery technology, applied in the field of electrochemistry, can solve problems such as unsatisfactory electrical properties, and achieve the effects of improving conductivity, improving rate characteristics, and increasing cycle times

Inactive Publication Date: 2019-09-10
贵州中时烯材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are reports on the introduction of graphene into the lithium iron phosphate cathode material, the electrical properties of the cathode composed of graphene and lithium-sulfur materials are not ideal.

Method used

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  • A cathode material for lithium-sulfur batteries bounded by a graphene conductive network for lithium polysulfides

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The lithium-sulfur battery positive electrode material constrained by the graphene conductive network of lithium polysulfide is made of the following components in parts by weight: 1 part of graphene microsheet, 6 parts of lithium polysulfide powder, polyimide ( 1 part of PI) solution, 5 parts of organic carbon source (glucose) aqueous solution, wherein, the mass percent of organic carbon source (glucose) in the organic carbon source (glucose) aqueous solution is 3%.

[0030] Wherein, the particle size of the lithium polysulfide powder is 100 nm.

[0031] The preparation method of above-mentioned cathode material, specific steps are as follows:

[0032] (1) adding the graphene microchips into the organic carbon source (glucose) aqueous solution, mixing evenly, and ultrasonically dispersing;

[0033] (2) Add lithium polysulfide powder, stir and mix, and carbonize under the protection of nitrogen to form a core-shell structure with ion channels to obtain material I;

[...

Embodiment 2

[0036] The anode material for lithium-sulfur battery constrained lithium polysulfide by graphene conductive network is made of the following components in parts by weight: 2 parts of graphene microsheets, 8 parts of lithium polysulfide powder, polyimide ( 1 part of PI) solution, 10 parts of organic carbon source (sucrose) aqueous solution, wherein, the mass percentage of organic carbon source (sucrose) in the organic carbon source (sucrose) aqueous solution is 15%.

[0037] Wherein, the particle size of the lithium polysulfide powder is 200 nm.

[0038] The preparation method of above-mentioned cathode material, specific steps are as follows:

[0039] (1) adding the graphene microchips into the organic carbon source (sucrose) aqueous solution, mixing evenly, and ultrasonically dispersing;

[0040] (2) Add lithium polysulfide powder, stir and mix, and carbonize under the protection of nitrogen to form a core-shell structure with ion channels to obtain material I;

[0041] (3)...

Embodiment 3

[0047] The cathode material for lithium-sulfur batteries constrained by the graphene conductive network to lithium polysulfide, in parts by weight, is made of the following components: 1 part of graphene microchips, 8 parts of lithium polysulfide powder, polyimide ( 1 part of PI) solution, 5 parts of organic carbon source (glucose) aqueous solution, wherein the mass percent of organic carbon source (glucose) in the organic carbon source (glucose) aqueous solution is 15%.

[0048] Wherein, the particle size of the lithium polysulfide powder is 100 nm.

[0049] The preparation method of above-mentioned cathode material, specific steps are as follows:

[0050] (1) adding the graphene microchips into the organic carbon source (glucose) aqueous solution, mixing evenly, and ultrasonically dispersing;

[0051] (2) Add lithium polysulfide powder, stir and mix, and carbonize under the protection of nitrogen to form a core-shell structure with ion channels to obtain material I;

[005...

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Abstract

The invention discloses a cathode material using a graphene conductive network to restrain lithium polysulfide for a lithium-sulfur battery. The cathode material is prepared from the following components in parts by weight: 1 to 2 parts of graphene micro sheet, 6 to 8 parts of lithium polysulfide powder, 1 part of polyimide solution and 5 to 10 parts of organic-carbon-source aqueous solution, wherein the mass percent of an organic carbon source in the organic-carbon-source aqueous solution is 3 to 15 percent. The graphene micro sheet of the cathode material has the characteristics of good dispersity, high conductivity and the like; the decrement of the re-piling among graphene lamellas is facilitated after modification. After being mixed with the organic-carbon-source aqueous solution and carbonized, the graphene micro sheet can be used for impeding the dissolution of the generated lithium polysulfide in an electrolyte; the improvement of the electrical conductivity of a cathode and the fixation of the lithium polysulfide are facilitated and not only is the cycle index of an electrode improved, but also the rate characteristic of the electrode is improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a cathode material for a lithium-sulfur battery in which lithium polysulfide is constrained by a graphene conductive network. Background technique [0002] Compared with the mainstream lithium iron phosphate batteries on the market, lithium-sulfur batteries have very obvious advantages. First, theoretically, the energy density of lithium-sulfur batteries is far higher than most types of power batteries. Secondly, the production cost of lithium-sulfur batteries is lower, and Low toxicity after use, less energy consumption for recycling. [0003] However, the biggest problem with lithium-sulfur batteries is that the number of cycles is relatively low and the stability is poor, which greatly increases the cost of lithium-sulfur batteries. [0004] Graphene has excellent mechanical, electrical, thermal and antibacterial properties, and its resistivity is lower t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/5815H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 冯岩李世刚
Owner 贵州中时烯材科技有限公司
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