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Red phosphorus modified composite separator, preparation method and application thereof

A composite diaphragm, red phosphorus technology, applied in electrical components, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of increased cost of lithium-sulfur batteries, complex synthesis processes, etc., to facilitate large-scale preparation, improve utilization, and low cost Effect

Active Publication Date: 2018-09-28
吉林省东驰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these metal oxides often require complex synthesis processes, resulting in an increase in the cost of lithium-sulfur batteries

Method used

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  • Red phosphorus modified composite separator, preparation method and application thereof
  • Red phosphorus modified composite separator, preparation method and application thereof
  • Red phosphorus modified composite separator, preparation method and application thereof

Examples

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preparation example Construction

[0031] The present invention also provides a preparation method for the above-mentioned composite diaphragm, comprising the following preparation steps:

[0032] Mix nano-nano red phosphorus particles, conductive carbon, binder and solvent to obtain a suspension;

[0033] The suspension is coated on one side of the base diaphragm for the lithium-ion battery, and dried to obtain a red phosphorus-modified composite diaphragm.

[0034] The invention mixes nanometer red phosphorus particles, conductive carbon, binder and solvent to obtain suspension.

[0035] In the present invention, the red phosphorus raw material is preferably ground to prepare nano red phosphorus particles meeting the above particle size requirements.

[0036] In the present invention, the method of grinding preferably adopts the method of ball milling, the time of the ball milling is preferably 4-27h, more preferably 10-20h; the speed of the ball milling is preferably 200-3000r / min, more preferably 500 to 2...

Embodiment 1

[0058] (1) Put red phosphorus into a ball mill at a speed of 400 rpm, and ball mill for 4 hours to prepare nanometer red phosphorus particles. The SEM images of the prepared nano-red phosphorus particles are as follows: figure 1 shown. From figure 1 It can be seen from the figure that the nano-red phosphorus particles prepared in this embodiment are spherical particles with a size of 50-200 nm, which is conducive to uniform distribution in the composite coating.

[0059] (2) Weigh 10 g of the prepared nano-red phosphorus particles and stir with a 70-g acetylene black mixer at a speed of 300 rpm for 2 hours to uniformly mix the nano-red phosphorus particles with the conductive carbon.

[0060] (3) The PVDF of 20g and the NMP of 200g are mixed with the mixture of nano-red phosphorus particles and conductive carbon in step (2), stirred with a stirrer, and the rotating speed is 800 rpm, and stirred for 8 hours.

[0061] (4) Coating the suspension prepared in step (3) on the PP ...

Embodiment 2

[0064] (1) Put red phosphorus into a ball mill with a rotating speed of 1000 rpm, and ball mill for 72 hours to prepare nano-red phosphorus particles with a particle size of 100-300nm.

[0065] (2) Weigh 200 g of the prepared nano-red phosphorus particles, stir with a 650-g carbon nanotube mixer at a speed of 400 rpm, and stir for 1 hour to uniformly mix the nano-red phosphorus particles with the conductive carbon.

[0066] (3) Weigh 150g of CMC and 1000g of deionized water and the mixture of nano-red phosphorus particles and conductive carbon in step 2, stir with a stirrer at a speed of 2000 rpm, and stir for 6 hours.

[0067] (4) Coating the suspension prepared in step (3) on the PP diaphragm, controlling the thickness to 20 microns, and drying at 70° C. to obtain a red phosphorus-modified composite diaphragm.

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Abstract

The invention provides a red phosphorus modified composite separator, and belongs to the technical field of lithium sulfur batteries. The red phosphorus modified composite separator comprises a base diaphragm and a mixed coating carried on one side surface of the base diaphragm; the mixed coating comprises nano red phosphorus particles and conductive carbon; the base diaphragm is one of a PP diaphragm and a PE diaphragm; the mixed coating of the nano red phosphorus particles and the conductive carbon has a thickness of 5 to 30 mum; the mass ratio of the nano red phosphorus particles to the conductive carbon in the mixed coating of the nano red phosphorus particles and the conductive carbon is 0.05-1:1; and the nano red phosphorus particles have a particle diameter of 50 to 100 nm. In the red phosphorus modified composite separator, the nano red phosphorus particles can effectively adsorb polysulfide, so that the shuttle flying effect is well suppressed; the conductive carbon is introduced into the composite separator, which can provide a conductive network for nanoparticles of the nano red phosphorus particles; the polysulfide absorbed via the nano red phosphorus particles is used,thereby improving the utilization rate of sulfur; and the ultra-low cost nano red phosphorus particles are used as raw materials for diaphragm modification, thereby facilitating large-scale preparation.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to a red phosphorus-modified composite separator and a preparation method and application thereof. Background technique [0002] Lithium-sulfur batteries have the advantages of high energy density (2600Wh / kg), high specific capacity (1675mAh / g), and low cost, and are considered to be promising candidates for next-generation batteries. However, the disadvantages of low active material utilization and short cycle life seriously restrict the practical application of lithium-sulfur batteries. The main reasons for the above problems are as follows: (1) sulfur and its discharge product lithium sulfide are electronic and ion insulators; (2) the discharge intermediate product lithium polysulfide is dissolved in the electrolyte, and lithium polysulfide is dissolved in the lithium Free diffusion in the sulfur battery system can react with the metal lithium negative electrode...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/052H01M50/403H01M50/431H01M50/497
CPCH01M10/052H01M50/431H01M50/403H01M50/449H01M50/411Y02E60/10
Inventor 谢海明王钊孙立群刘佳丛丽娜
Owner 吉林省东驰新能源科技有限公司
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