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Transition metal capture diaphragm as well as preparation method and application thereof

A transition metal and diaphragm technology, which is applied in the field of transition metal capture diaphragm and its preparation, can solve the problems of battery energy attenuation and easy dissipation of Mn ions, etc., and achieve the effect of suppressing dissipation and improving the overall capacity

Active Publication Date: 2022-07-01
NINGDE ZHUOGAO NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of this application is to provide a transition metal capture membrane and its preparation method, which can be applied to lithium-ion batteries, which can solve the problem that the positive electrode active material of lithium-ion batteries is easy to dissipate Mn ions and cause battery energy attenuation

Method used

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  • Transition metal capture diaphragm as well as preparation method and application thereof
  • Transition metal capture diaphragm as well as preparation method and application thereof
  • Transition metal capture diaphragm as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] The preparation of polypropylene grafted maleic anhydride and styrene copolymer includes the following steps:

[0048] (1) Add 2g maleic anhydride (MAH) and 0.4g dicumyl peroxide (DCP) into 1L of xylene, stir and dissolve at 60°C to obtain solution one.

[0049] (2) 2.15 g of styrene (St) was added to solution one, and stirred to dissolve at room temperature to obtain solution two.

[0050] (3) 200 g of polypropylene particles (PP) were added to solution two, and pre-dispersed at 60° C. for 30 minutes to obtain mixture dispersion liquid three.

[0051] (4) At 185°C and 30rpm rotating speed, add the mixture dispersion liquid three into the RM-200C torque rheometer to carry out melt grafting to obtain graft four.

[0052] (5) The graft 4 was added to xylene, stirred at room temperature for 30 minutes, stood for 30 minutes, and then was subjected to suction filtration treatment, washed with acetone for 3-5 times, and dried to obtain polypropylene grafted maleic anhydride ...

Embodiment 2

[0058] 2g maleic anhydride (MAH) and 0.4g dicumyl peroxide (DCP) in step 1 of Example 1 were adjusted to 20g and 4g respectively, and 2.15g styrene (St) in step 2 was adjusted to 21.5g; other Consistent with Example 1.

Embodiment 3

[0060] The polypropylene resin, polypropylene grafted maleic anhydride and styrene copolymer (PP-g-MAH / St) and antioxidant 1010 in step 6 of Example 1 were adjusted to 100:20 according to the mass ratio=100:10:0.2 : 0.2, the others are the same as in Example 1.

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Abstract

The invention discloses a transition metal capture diaphragm as well as a preparation method and application thereof, and relates to the technical field of secondary batteries. The preparation method comprises the following steps: preparing a chelating ligand-carrying diaphragm from polypropylene grafted maleic anhydride and styrene copolymer (PP-g-MAH / St), polyolefin resin and an antioxidant through melt extrusion and stretching processes, soaking the chelating functional diaphragm in a LiOH solution for activating treatment, and forming lithium carboxylate on the diaphragm. And soaking with deionized water to remove residual LiOH on the surface of the diaphragm to obtain the transition metal capture functional diaphragm, and effectively capturing Mn ions escaping from a positive electrode active material in the charge-discharge cycle process of the battery.

Description

technical field [0001] The present application relates to the field of secondary batteries, and in particular, to a transition metal capture separator and a preparation method and application thereof. Background technique [0002] Positive and negative electrode materials are the key factors in determining the energy density of batteries. Starting from the existing technology, breakthroughs in positive electrode materials are easier to achieve a leap in energy density. Among them, lithium iron manganese phosphate, high nickel decobalt ternary material and lithium-rich manganese base are the main cathode research materials. However, the manganese-based cathode active materials of lithium-ion batteries (LIBs) experience significant capacity fading during charge-discharge cycles. The Mn ions released from the positive electrode migrate to the negative electrode through the electrolyte solution, and then deposit on the negative electrode. The manganese ions attached to the neg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/411H01M50/417H01M50/403H01M10/0525B29C48/08B29C71/02B29C55/06
CPCH01M50/411H01M50/417H01M50/403H01M10/0525B29C48/08B29C48/0018B29C71/02B29C2071/022Y02E60/10
Inventor 张振坤王晓明周素霞黄云李姗姗邹奇张云金厉轩豪
Owner NINGDE ZHUOGAO NEW MATERIAL TECH CO LTD
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