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Preparation method of modified lithium ion battery diaphragm

A lithium-ion battery, modified technology, applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems that limit the application of diaphragms, achieve good cycle stability, improve electrical conductivity, and good electrochemical performance Effect

Pending Publication Date: 2022-03-04
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of nanodiamonds on diaphragms has never been reported
In addition to nanodiamonds, zinc and zinc oxide are also two commonly used anode materials for lithium-ion batteries, but their application in the field of separators is limited due to their conductive properties.

Method used

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  • Preparation method of modified lithium ion battery diaphragm
  • Preparation method of modified lithium ion battery diaphragm
  • Preparation method of modified lithium ion battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 Preparation of Nanodiamond Modified Commercial PP Diaphragm

[0032] The nano-diamond powder is heated to 500° C. under a hydrogen atmosphere in a vacuum chamber (99.99% hydrogen, passing through the chamber at 50 sccm), and cooled to room temperature under hydrogen flow;

[0033] Dissolve 0.005g of hydrogenated nano-diamond powder in 4ml of ethanol solution, and obtain NDs colloidal solution after ultrasonication for 1 hour;

[0034] The NDs colloidal solution was coated on the commercial polypropylene separator, and after being placed in the air for a week, the NDs-modified PP separator material was obtained, which was recorded as sample 2#, and the ordinary PP separator was recorded as comparative sample 1#.

[0035] The scanning electron micrographs of samples 1# and 2# are shown in figure 1 with figure 2 , in the figure a represents before cycle, a' represents after cycle, the TEM images of adsorbed particles on the DPP separator are shown in Figure ...

Embodiment 2

[0037] Example 2: Preparation of Nanodiamond / Zinc Carbonate Modified Commercial Polypropylene Diaphragm

[0038] 1) Take Zn(AC) at a molar ratio of 2.4:2:4:1 2 2H 2 O, CTAB (cetyltrimethylammonium bromide), NaOH and EDA (ethylenediamine), are dissolved in ethanol respectively to obtain respective ethanol solutions;

[0039] 2) The ethanol solution of CTAB, NaOH and EDA was dropped into the Zn(AC) 2 2H 2 In the ethanol solution of O, stir while adding dropwise, gradually form a light yellow precipitate;

[0040] 3) adding nano-diamonds to the solution of step 2) and continuing to stir for 30 minutes, the amount of nano-diamonds is Zn(AC) 2 2H 2 0.5wt% of O, the suspension was moved to an autoclave, heated at 180°C for 8h, the supernatant was discarded, the precipitate was taken out, and the nano-diamond / zinc oxide composite material ZnO / NDs was obtained after drying;

[0041] 4) Dissolve 0.01g of ZnO / NDs powder in 4ml of ethanol solution, and obtain ZnO / NDs colloidal solu...

Embodiment 3

[0045] Example 3: Use PP, DPP, DZPP separators as lithium-ion battery components.

[0046] The lithium ion battery negative electrode is composed of 80wt% graphite material (active material), 10wt% binder (polyvinylidene fluoride, PVDF) and 10wt% conductive agent carbon black. The three were mixed and ground for 0.5h, then put into a container, and a certain amount of 1-methyl-2-pyrrolidone (NMP, solvent) was added into the container, and then placed on a magnetic stirrer and stirred at a constant speed for 6h, so that the mixture became a viscous fluid. Copper foil is used as a current collector, and the above-mentioned mixed viscous material is coated on the copper foil, and the coating density must be uniform. The temperature of the vacuum drying oven was set at 120° C., and the above-mentioned copper foil smear was taken and placed in the drying oven. After timing for 12 hours, it was taken out for use. The prepared copper foil smear is cut into several electrode discs wi...

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Abstract

The invention discloses a preparation method of a modified lithium ion battery diaphragm, and belongs to the technical field of modification of lithium ion battery diaphragms. The preparation method comprises the following steps: preparing an ethanol solution of Zn (AC) 2.2 H2O and CTAB (cetyltrimethyl ammonium bromide), mixing to form a faint yellow precipitate, adding nano-diamond, heating to obtain a nano-diamond / zinc oxide composite material ZnO / NDs, preparing an NDs colloidal solution or a ZnO / NDs colloidal solution, coating a polypropylene diaphragm with the solution to obtain the modified lithium ion battery diaphragm material, and the like. The novel diaphragm modification material prepared by the invention has good electrochemical performance, and the lithium ion battery prepared from the novel diaphragm modification material has good cycle stability and incremental capacity.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery diaphragm modification, and relates to a kind of nano-diamond (NDs) and nano-diamond / zinc carbonate (ZnCO 3 ) Modification method for modifying polyolefin membrane. Background technique [0002] Lithium-ion batteries have become standard power sources in various electronic storage fields due to their high energy density and long cycle life. As an important part of lithium ions, although the separator does not participate in the electrochemical reaction, it provides a channel for the transmission of lithium ions, while preventing direct contact between the positive and negative electrodes and avoiding short circuits. Currently, the most prevalent separators in commerce are wet- or dry-prepared polyolefins, such as polypropylene (PP) separators, which have good electrical insulation and low ion migration resistance, however, unfavorable electrolyte wettability, thermal Stability and me...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M10/0525H01M50/417H01M50/431
CPCH01M50/403H01M50/431H01M50/417H01M10/0525Y02E60/10
Inventor 李红东孙小晨王琛张鑫冯晶翟晓丽
Owner JILIN UNIV
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