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 process

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

Experimental program
Comparison scheme
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Example Embodiment

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

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

[0033] The suspension is coated on one side of the base diaphragm for a lithium ion battery, and after drying, a composite diaphragm modified with red phosphorus is obtained.

[0034] The invention mixes nano red phosphorus particles, conductive carbon, adhesive and solvent to obtain a suspension.

[0035] In the present invention, it is preferable to grind the red phosphorus raw materials into nano red phosphorus particles that meet the above-mentioned particle size requirements.

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

Example Embodiment

[0057] Example 1

[0058] (1) Put the red phosphorus into a ball mill at a speed of 400 revolutions per minute and ball mill for 4 hours to prepare nano red phosphorus particles. The SEM image of the prepared nano red phosphorus particles is as follows figure 1 Shown. From figure 1 It can be seen that the nano red phosphorous particles prepared in this embodiment are spherical-like particles with a size of 50 to 200 nm, which is favorable for uniform distribution in the composite coating.

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

[0060] (3) Weigh 20 g of PVDF and 200 g of NMP to mix with the mixture of nano red phosphorous particles and conductive carbon in step (2), stir with a mixer at a speed of 800 rpm, and stir for 8 hours.

[0061] (4) The suspension prepared in step (3) is coated...

Example Embodiment

[0063] Example 2

[0064] (1) Put the red phosphorus into a ball mill at a rotation speed of 1000 revolutions per minute and ball mill for 72 hours to prepare nano red phosphorus particles. The particle size of the nano red phosphorus particles is 100-300 nm.

[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 revolutions per minute, and stir for 1 hour to uniformly mix the nano red phosphorus particles with conductive carbon.

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

[0067] (4) The suspension prepared in step (3) is coated on the PP diaphragm, the thickness is controlled to be 20 microns, and the composite diaphragm modified with red phosphorus is obtained after drying at 70°C.

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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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