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Metal evaporation composite nanocellulose membrane current collector and preparation method thereof

A technology of nanocellulose and nanofiber membranes, applied in vacuum evaporation plating, metal material coating process, sputtering plating, etc. Battery energy density and other issues, to achieve the effect of easy control of coating thickness, reduce the difficulty of evaporation, improve tensile performance and tear resistance

Active Publication Date: 2020-12-25
浙江长宇新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional pure metal current collectors, on the one hand, are close to the limit in terms of thinning process capabilities, and cannot effectively further increase the energy density of batteries; on the other hand, although metals have good ductility, pure metal current collectors are completely folded After the performance has changed, further affecting the performance of the battery
[0004] The composite current collector technology of many polymers as the base film has been widely developed, but the smooth polymer surface is not conducive to the direct evaporation of the current collector metal, and often requires the use of a transition layer or an adhesive layer, as a non- Active materials, these added layers also affect the overall energy density of the battery

Method used

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  • Metal evaporation composite nanocellulose membrane current collector and preparation method thereof
  • Metal evaporation composite nanocellulose membrane current collector and preparation method thereof
  • Metal evaporation composite nanocellulose membrane current collector and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The nanocellulose membrane is prepared by the following steps:

[0033] (1) 20g microcrystalline cellulose is mixed with 300ml 64wt% sulfuric acid solution, and stirred at room temperature for 1h;

[0034] (2) add deionized water and dilute to 2wt%;

[0035] (3) Vacuum suction filtration, repeated washing until the pH value is neutral, and vacuum drying for about 10 minutes. The filter membrane used has a pore size of 0.5 μm to prepare a nanocellulose film of 8 μm.

[0036] After the nanocellulose membrane is prepared, the metal evaporation composite nanocellulose membrane current collector is prepared according to the following steps:

[0037] (1) nanocellulose membrane is placed on the fixed equipment;

[0038] (2) Vacuum the equipment to 8.0×10 -4 mba, then warm up the device;

[0039] (3) In the vacuum environment, the copper film material is pre-melted at a wire feeding speed of 250mm / min,

[0040] (4) After the pre-melting is completed, the copper target is e...

Embodiment 2

[0045] The nanocellulose membrane is prepared by the following steps:

[0046] (1) 20g microcrystalline cellulose was mixed with 300ml 55wt% sulfuric acid solution, and stirred at room temperature for 45min;

[0047] (2) add deionized water and dilute to 1.8wt%;

[0048] (3) Vacuum suction filtration, repeated washing until the pH value is neutral, and vacuum drying for 15 minutes. The filter membrane used has a pore size of 2 μm to prepare a 10 μm nanocellulose film.

[0049] After the nanocellulose membrane is prepared, the metal evaporation composite nanocellulose membrane current collector is prepared according to the following steps:

[0050] (1) nanocellulose membrane is placed on the fixed equipment;

[0051] (2) Vacuum the equipment to 1.0×10 -3 mba, then warm up the device;

[0052] (3) In the vacuum environment, the copper film material is pre-melted at a wire feeding speed of 200mm / min,

[0053] (4) After the pre-melting is completed, the copper target is evapo...

Embodiment 3

[0058] The nanocellulose membrane is prepared by the following steps:

[0059] (1) 20g microcrystalline cellulose was mixed with 300ml 65wt% sulfuric acid solution, and stirred at room temperature for 60min;

[0060] (2) add deionized water and dilute to 2wt%;

[0061] (3) Vacuum suction filtration, repeated washing until the pH value is neutral, and vacuum drying for 15 minutes. The filter membrane used has a pore size of 5 μm to prepare a 10 μm nanocellulose film.

[0062] After the nanocellulose membrane is prepared, the metal evaporation composite nanocellulose membrane current collector is prepared according to the following steps:

[0063] (1) nanocellulose membrane is placed on the fixed equipment;

[0064] (2) Vacuum the equipment to 8.0×10 -4 mba, then warm up the device;

[0065] (3) In the vacuum environment, the copper film material is pre-melted at a wire feeding speed of 180mm / min,

[0066] (4) After the pre-melting is completed, the copper target is evaporate...

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Abstract

The invention discloses a metal evaporation composite nanocellulose membrane current collector and a preparation method of the current collector, the current collector comprises a nanocellulose membrane and an evaporation metal layer, and the preparation method comprises the following steps: 1) mixing microcrystalline cellulose with 55-65% concentrated sulfuric acid, and stirring for 30-60 minutesto obtain a nanocellulose suspension; 2) adding ionized water into the nano cellulose suspension to dilute to 0.5-2 wt%; (3) carrying out vacuum filtration and vacuum drying to obtain a nanocellulosemembrane current collector, wherein the pore diameter of a filter membrane is 0.5-5 microns; (4) placing the nano-cellulose membrane in a vacuum environment, evaporating metal to one side of the nano-cellulose membrane to form an evaporated metal layer, wherein the evaporation process parameters are as follows: the deposition voltage is 4-10 V; the wire feeding amount is 60-350 mm / min; the vacuumdegree is 8*10<-4>-5*10<-2>mba; and the membrane running speed is 3-10 m / s. The tensile index of the current collector obtained by the technical scheme of the invention is 80-95N.m.g<-1>, the tearingindex is 20-25mN.m<2>. g<-1>, and the folding strength is 30-40 times.

Description

technical field [0001] The invention relates to the field of battery technology, in particular to a metal evaporation composite nanocellulose membrane current collector and a preparation method thereof Background technique [0002] The improvement of battery energy density is a matter of great concern in the field of battery technology in recent years. The thinning and weight reduction of current collectors have been widely studied as an effective way to improve the overall battery volume energy density and mass energy density. At the same time, both the field of power batteries and the field of wearable electronic devices have put forward further requirements for the flexibility and foldability of current collectors. [0003] Traditional pure metal current collectors, on the one hand, are close to the limit in terms of thinning process capabilities, and cannot effectively further increase the energy density of batteries; on the other hand, although metals have good ductilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/06C08J5/18C08L1/04C23C14/20
CPCC08J7/06C08J5/18C23C14/20C08J2301/04Y02E60/10
Inventor 吴明忠朱正录黄云辉伽龙焦鑫鹏曾祥平
Owner 浙江长宇新材料股份有限公司
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