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Ultrafine diamond coated diaphragm and lithium ion battery using diaphragm

A separator and diamond technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as defects, ceramic separators falling off surfaces, etc., to inhibit the generation of lithium crystal dendrites, inhibit lithium ion aggregation, and increase safety performance. Effect

Active Publication Date: 2018-09-18
河南力旋科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ceramic separators have problems such as peeling and surface defects, and the optimal coating material still needs to be explored and defined

Method used

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  • Ultrafine diamond coated diaphragm and lithium ion battery using diaphragm
  • Ultrafine diamond coated diaphragm and lithium ion battery using diaphragm
  • Ultrafine diamond coated diaphragm and lithium ion battery using diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A method for preparing an ultrafine diamond-coated isolation film, comprising the steps of:

[0037] (1) Weigh each raw material in the solid component in the slurry, and the mass percentage of each component is in brackets

[0038] Ultrafine diamond powder and inorganic filler 10.16kg (66%);

[0039] (5.08kg of ultrafine diamond powder, 5.08kg of inorganic filler, the quality of ultrafine diamond powder is 50% of the total mass of ultrafine diamond powder and inorganic filler.)

[0040] Filler CMC 3.70kg (24%);

[0041] Glue SBR 1.54kg (10%);

[0042] Measure 5.08kg of ultra-fine diamond powder, 5.08kg of inorganic filler and 3.70kg of CMC, first stir slowly for 15 minutes, scrape the bottom and scrape the wall, then stir quickly for 60 minutes, and mix well; add 40kg of deionized water, stir slowly for 15 minutes, After scraping the bottom and wall, stir quickly for 60 minutes, and mix well; add 1.54kg of styrene-butadiene rubber SBR, stir for 15 minutes at a slow ...

Embodiment 2

[0046] A method for preparing an ultrafine diamond-coated isolation film, comprising the steps of:

[0047] (1) Weigh each raw material in the solid component in the slurry, and the mass percentage of each component is in brackets

[0048] Ultrafine diamond powder and inorganic filler 9.80kg (70%),

[0049] (0.98kg of ultrafine diamond powder, 8.82kg of inorganic filler, the quality of ultrafine diamond powder is 10% of the total mass of ultrafine diamond powder and inorganic filler.)

[0050] Filler CMC 2.8kg (20%),

[0051] Glue SBR 1.4kg (10%);

[0052] Measure 7.82kg of alumina powder, 1kg of boehmite powder, 0.98kg of ultra-fine diamond powder and 2.8kg of CMC, first stir slowly for 15 minutes, scrape the bottom and scrape the wall, then stir quickly for 60 minutes, and mix well; add 15kg of deionized water , stir at a slow speed for 15 minutes, after scraping the bottom and walls, stir quickly for 60 minutes, and mix well; add 1.4kg of styrene-butadiene rubber SBR, st...

Embodiment 3

[0056] A method for preparing an ultrafine diamond-coated isolation film, comprising the steps of:

[0057] (1) Weigh each raw material in the solid component in the slurry, and the mass percentage of each component is in brackets

[0058] Ultrafine diamond powder and inorganic filler 10kg (80%),

[0059] (9kg of ultrafine diamond powder, 1kg of inorganic filler alumina powder, the quality of ultrafine diamond powder is 90% of the total mass of ultrafine diamond powder and inorganic filler.)

[0060] Filler CMC 1.8kg (14.4%),

[0061]Glue SBR 0.7kg (5.6%);

[0062] Measure 1kg of alumina powder, 9kg of ultra-fine diamond powder and 1.8kg of CMC, first stir slowly for 15 minutes, scrape the bottom and scrape the wall, then stir quickly for 60 minutes, mix well; add 15kg of deionized water, stir slowly for 15 minutes, scrape the bottom After scraping the wall, stir quickly for 60 minutes and mix well; add 0.7kg styrene-butadiene rubber SBR, stir slowly for 15 minutes, after s...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and relates to an ultrafine diamond coated diaphragm, a preparation method thereof, and a lithium ion battery using the diaphragm. The ultrafine diamond coated diaphragm is prepared through the following steps: coating a base film with a slurry, and drying the coated base film, wherein the slurry contains, by mass, 65-85% of ultrafine diamond micro-powder and am inorganic filler, 10-25% of a filler and 3-15% of glue; and the mass of the ultrafine diamond micro-powder is 0.5-100% of the total mass of the ultrafine diamond micro-powder and the inorganic filler. The diaphragm makes micron-sized diamond crystal particles uniformly dispersed on the surface of the base film, so the micro-porous structure of the diaphragm is effectively strengthened, and the heat shrinkage resistance and the puncture strength are improved. The lithium ion battery using the diaphragm improves the transfer state of lithium ions in an electrode sheet interface, inhibits the lithium ions from accumulating into lithium element dendrite after the lithium battery is repeatedly circulated, and improves the safety and the cycle performances ofthe battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to an ultrafine diamond-coated isolation film, a preparation method thereof and a lithium ion battery using the isolation film. Background technique [0002] Lithium-ion battery separator is an important part of polymer lithium battery. In lithium-ion battery, it carries and isolates the positive and negative electrodes, absorbs the electrolyte porously, and forms an important function of ion pathway. Generally, PP monolayer membrane or PP-PE-PP base membrane prepared by dry or wet process has the advantages of high porosity, corrosion resistance and effective closed cell temperature, and is widely used, however, its strength is low, The thermal stability is poor, which affects the cycle performance and safety performance of the battery; the pores of the non-woven fabric are too large and the short circuit rate is high; the cost of electrospinning is relatively high. ...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/431H01M50/489
CPCH01M10/0525H01M50/403H01M50/431Y02E60/10
Inventor 夏辉叶清董振伟张松山
Owner 河南力旋科技股份有限公司
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