Biomass nanofiber diaphragm as well as preparation method and application thereof

A nanofiber membrane and nanofiber technology, which is applied in the field of biomass nanofiber membranes, can solve the problems of reducing the mechanical properties of membranes and loose connection of nanofibers, and achieve the effects of excellent electrochemical performance, high ion migration number and good mechanical properties.

Active Publication Date: 2019-07-05
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these improved methods lead to loose connections between nanofibers with the formation of pores in the separator, thereby reducing the mechanical properties of the separator.

Method used

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  • Biomass nanofiber diaphragm as well as preparation method and application thereof
  • Biomass nanofiber diaphragm as well as preparation method and application thereof
  • Biomass nanofiber diaphragm as well as preparation method and application thereof

Examples

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preparation example Construction

[0051] The present invention also provides a kind of preparation method of biomass nanofiber membrane, comprises the following steps:

[0052] S1, providing biomass nanofiber slurry;

[0053] S2. Reacting the biomass nanofiber slurry with a modifier, the modifier being one or more of acrylonitrile and isoacrylonitrile, to obtain biomass nanofibers modified with cyano groups;

[0054] S3. Papermaking the biomass nanofibers modified with cyano groups to obtain a biomass nanofiber separator.

[0055] The biomass nanofiber membrane prepared by the method of the invention has good mechanical properties, and excellent electrochemical properties such as ion conductivity.

[0056] In the embodiment of the present invention, a biomass nanofiber slurry is firstly prepared. Specifically, the biomass nanofiber and dispersion liquid can be mixed and beaten to obtain a biomass nanofiber slurry. The biomass nanofibers can be selected from one or more of cellulose nanofibers and chitin nano...

Embodiment 1

[0067] 1) Disperse 3 g of dried chitin flakes in 1 L of deionized water to obtain a suspension; then add acetic acid solution to adjust the pH value of the resulting suspension to 3, and stir at room temperature for 12 hours. The suspension of 0.3wt.% chitin flakes was ground with a beater at a speed of 20000r / min for 1 hour to obtain chitin nanofiber slurry.

[0068]2) Pour 1L of the resulting chitin nanofiber slurry into a 3L beaker, add 12g of sodium hydroxide, stir evenly, add 2L of acetone, and finally add about 180mL of acrylonitrile to make the concentration of acrylonitrile in the entire mixed solution 1mol / L. (The solvent is acetone, the concentration is 1M), and stirred at room temperature for 5 hours. Then filter and wash twice with acetone and deionized water, respectively, to obtain 3 g of cyano-modified chitin nanofibers (referred to as CCN-1M).

[0069] figure 1 Infrared test graphs of chitin nanofibers modified with different concentrations of cyano groups, ...

Embodiment 2～3

[0076] Prepare according to step 1) and step 2) in Example 1, the difference is that the concentrations of acrylonitrile added in step 2) are 3M and 5M respectively, and cyano-modified chitin nanofibers CCN-3M and CCN are respectively obtained. -5M (cyano substitution degrees are 0.235, 0.234, respectively). Infrared spectrum see figure 1 , after the comparison of the infrared spectra before and after modification, the infrared absorption peak of the cyano group can be clearly seen, which proves that the cyano group is indeed grafted onto the fiber.

[0077] Correspondingly, according to step 3) in Example 1, cyano-modified chitin nanofiber membranes CCN-3M and CCN-5M were respectively prepared.

[0078] Carry out performance test according to the test method of embodiment 1, tensile performance test result sees image 3 , the tensile strength of the separators modified with different concentrations of acrylonitrile were all greater than 120MPa. For ionic conductivity test ...

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Abstract

The invention discloses a biomass nanofiber diaphragm as well as a preparation method and application thereof. The biomass nanofiber diaphragm comprises a biomass nanofiber diaphragm layer with a compact structure, and the biomass nanofiber diaphragm is prepared from biomass nanofibers chemically modified with cyano groups. According to the biomass nanofiber diaphragm, due to the modification of the cyano groups, the surface of the biomass nanofiber diaphragm can be combined with a liquid electrolyte to form a gel state, and lithium ions can be transmitted through the gel state, so that the transmission of the lithium ions does not depend on the aperture of the diaphragm. The biomass nanofiber diaphragm provided by the invention is high in compactness, high in ionic conductivity, high in electrolyte wettability and high in ion mobility. According to the diaphragm, the complicated step that the biomass nanofiber diaphragm needs a pore forming process to achieve high porosity and to improve the lithium ion conductivity of the diaphragm can be avoided, the biomass nanofiber diaphragm provided by the invention has high mechanical properties, and the produced biomass nanofiber diaphragmhas the advantages of compactness and excellent electrochemical performance and the like.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a biomass nanofiber separator, its preparation method and application. Background technique [0002] Lithium batteries include lithium metal batteries and lithium ion batteries. At present, lithium ion batteries (LIB) are power / energy storage batteries with relatively excellent comprehensive performance. With the increasing demand for high-performance portable electronic products and electric vehicles, the requirements for energy density, cycle life and safety of lithium-ion batteries will increase significantly. Lithium-ion batteries are mainly composed of positive electrodes, separators, electrolytes and negative electrodes; during charging and discharging, Li + Intercalation and deintercalation back and forth between two electrodes. Among them, as a key component of lithium-ion batteries, the separator plays the role of isolating the positive and negative electrode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M50/403H01M50/426H01M50/446H01M50/449H01M50/489
CPCH01M10/0525H01M50/4295H01M50/44H01M50/403H01M50/449Y02E60/10
Inventor 姚宏斌沈豹张天文
Owner UNIV OF SCI & TECH OF CHINA
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