A lithium-sulfur battery sandwich, a preparation method thereof, and a lithium-sulfur battery

A lithium-sulfur battery and interlayer technology, which is applied in the manufacture of battery electrodes, lithium batteries, and electrolyte batteries, can solve problems such as the deterioration of lithium-sulfur battery cycle stability, and achieve the effects of improving electrochemical performance, inhibiting the shuttle effect, and preventing migration

Inactive Publication Date: 2018-12-28
NANOCARBON CO LTD
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Problems solved by technology

[0004] Although carbon-sulfur composite materials improve the cycle stability of lithium-sulfur batteries to a certain extent, polysulfides will still dissolve in the electrolyte as the number of charge-discharge cycles increases, resulting in the continuous deterioration of the cycle stability of lithium-sulfur batteries.

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  • A lithium-sulfur battery sandwich, a preparation method thereof, and a lithium-sulfur battery
  • A lithium-sulfur battery sandwich, a preparation method thereof, and a lithium-sulfur battery

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[0027] The present invention also provides a preparation method of the lithium-sulfur battery interlayer, comprising the following steps:

[0028] Mixing the shearing agent and the organic solvent to obtain a mixed solution;

[0029] The mixed solution is infiltrated into the carbon nanotube conductive paper to obtain a lithium-sulfur battery interlayer.

[0030] In the present invention, the shear agent is mixed with an organic solvent to obtain a mixed liquid; in the present invention, the organic solvent is preferably one or more of N-methylpyrrolidone (NMP) and ethanol.

[0031] After obtaining the mixed solution, the present invention infiltrates the mixed solution into the carbon nanotube conductive paper to obtain an interlayer; in the present invention, the volume ratio of the quality of the shearing agent to the organic solvent is preferably (1g: 200ml), More preferably (1 g: 150 ml), most preferably (1 g: 100 ml).

[0032] In the present invention, the carbon nanot...

Embodiment 1

[0071] Preparation of carbon nanotube conductive paper:

[0072] Disperse 0.5 g of ball-milled carbon nanotubes and 0.05 g of sodium lauryl sulfate in 200 mL of deionized water, sonicate for 30 minutes, and stir with a high-speed shear for 30 minutes to obtain a carbon nanotube dispersion;

[0073] Mix 0.5g of paper fiber with 500mL of deionized water, and use a high-speed shear to break the paper fiber into a paper fiber suspension;

[0074] The carbon nanotube dispersion and the paper fiber suspension were mixed, sheared for 30 minutes, and filtered under a negative pressure of 0.06Mpa to obtain carbon nanotube paper.

[0075] Preparation of interlayer:

[0076] Dissolve 0.5g of dithiothreitol in 20mL of NMP, uniformly infiltrate into the carbon nanotube paper; dry at 60°C for 12 hours, slice with a microtome to obtain the mezzanine.

[0077] Preparation of positive electrode sheet:

[0078] The active material sulfur, carbon nanotubes, conductive carbon black and polyv...

Embodiment 2

[0083] Preparation of carbon nanotube conductive paper:

[0084] Disperse 0.5 g of ball-milled carbon nanotubes and 0.05 g of sodium lauryl sulfate in 200 mL of deionized water, sonicate for 30 minutes, and stir with a high-speed shear for 30 minutes to obtain a carbon nanotube dispersion;

[0085] Mix 0.5g of paper fiber with 200mL of deionized water, and use a high-speed shear to break the paper fiber into a paper fiber suspension;

[0086] Mix the carbon nanotube dispersion with the paper fiber suspension, shear for 30 minutes, and filter under a negative pressure of 0.06Mpa to obtain carbon nanotube paper;

[0087] Preparation of interlayer:

[0088] Dissolve 1.5g of dithiothreitol in 20mL of NMP, and evenly soak into the carbon nanotube paper. Dry at 60°C for 12 hours, slice with a microtome the mezzanine.

[0089] Preparation of positive electrode sheet:

[0090] The active material sulfur, carbon nanotubes, conductive carbon black and polyvinylidene fluoride were ...

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Abstract

The invention provides a lithium-sulfur battery sandwich comprising carbon nanotube conductive paper and a shearing agent dispersed in the carbon nanotube conductive paper; the shearing agent is one or more of dithiothreitol, glutathione, TCEP (tris (2-carbonylethyl) phosphate hydrochloride) and mercaptoethanol (ME). After the lithium-sulfur battery is prepared by utilizing the sandwich layer withthe shearing agent, the shearing agent shears the high-order polysulfide, thereby preventing the dissolution of the high-order polysulfide. The porosity of carbon nanotube conductive paper can be more conducive to the adsorption of polysulfides to prevent their migration to the negative electrode. The physico-chemical synergism of the shearing agent and carbon nanotube conductive paper inhibits the shuttle effect and improves the electrochemical performance of lithium sulfide batteries. According to the description of the examples, the lithium sulfur battery provided by the present inventionhas better electrochemical performance than the lithium sulfur battery prepared by sandwiching without a shearing agent.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium-sulfur battery interlayer, a preparation method thereof, and a lithium-sulfur battery. Background technique [0002] With the rapid development of electric vehicles and electronic mobile devices, energy storage devices with higher energy density have become a research hotspot. Lithium-sulfur batteries have become a research hotspot in the field of new energy batteries because of their theoretical capacity is much larger than the currently used commercial secondary batteries, and sulfur is cheap, abundant in resources, safe and low in toxicity. However, the actual energy density achieved by lithium-sulfur batteries is far lower than its theoretical energy density, and the cycle life is poor, which seriously hinders the industrialization process of lithium-sulfur batteries. The main reason is that in the lithium-sulfur battery system, lithium polysulfide, an intermedia...

Claims

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Application Information

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IPC IPC(8): H01M10/052H01M4/62H01M10/058
CPCH01M4/628H01M10/052H01M10/058Y02E60/10Y02P70/50
Inventor 孙晓刚郑典模蔡满园聂艳艳陈珑潘鹤政
Owner NANOCARBON CO LTD
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