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Inorganic solid electrolyte-cellulose composite diaphragm and preparation method thereof

A technology of solid electrolyte and composite diaphragm, applied in the direction of circuits, electrical components, battery components, etc., can solve the problems of cellulose diaphragm thickness, poor mechanical strength, large pores, etc., and achieve convenient preparation, good wettability, and pore structure evenly distributed effect

Inactive Publication Date: 2018-08-31
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current cellulose separators are too thick, have poor mechanical strength, and have large pores, which limit their applications.

Method used

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  • Inorganic solid electrolyte-cellulose composite diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] figure 1 Example 1 of the present invention provides a schematic flow chart of a preparation method of an inorganic solid electrolyte-cellulose composite separator, as shown in figure 1 Shown, described preparation method comprises:

[0028] S10, adding the cellulose raw material into deionized water, soaking it, and then grinding it in a pulper to obtain a cellulose slurry with a microfibrous structure.

[0029] Specifically, the cellulose raw material includes one or more mixed pulps of wood pulp, hemp pulp, cotton pulp or bamboo pulp. Soak in deionized water for 24 hours, then grind in a pulper, the grinding speed is 1-20,000 / rev, the concentration of the prepared cellulose slurry is 1wt%-50wt%, the obtained cellulose slurry has a microfibrous structure, its The diameter of cellulose is 200-500nm.

[0030] S20, adding the inorganic solid electrolyte into deionized water to make a suspension, adding a wet strength agent and stirring the cellulose slurry, and mixing...

Embodiment 2

[0040] The preparation method of the inorganic solid electrolyte-cellulose composite diaphragm provided in Example 2 includes the following steps:

[0041] 1) Add 10 g of cotton pulp to 1 L of deionized water, soak for 24 hours, and then grind in a pulper at 20,000 rpm to obtain a cotton pulp cellulose slurry with a concentration of 2 wt % and a cellulose diameter of 500 nm.

[0042] 2) Add 5g lithium aluminum titanium phosphate (LATP) inorganic solid electrolyte to 500mL deionized water to make a suspension, add 0.5g chitosan, stir vigorously with the cellulose slurry, and mix well;

[0043] 3) Using the papermaking process to make paper from cellulose slurry containing solid electrolyte into a film, that is, a wet cellulose electrolyte composite diaphragm;

[0044] 4) drying the wet composite separator in an oven at 80°C to prepare a cellulose-solid electrolyte composite separator with a thickness of 20 μm;

[0045] The diaphragm acts as a diaphragm and an electrolyte at th...

Embodiment 3

[0047] The preparation method of the inorganic solid electrolyte-cellulose composite diaphragm provided in Example 3 includes the following steps:

[0048] 1) Add 15 g of hemp pulp to 1 L of deionized water, soak for 24 hours, then grind in a pulper at 15,000 rpm to obtain a hemp pulp cellulose slurry with a concentration of 1.5 wt%, and a cellulose diameter of 200 -500nm.

[0049] 2) Add 5g lithium aluminum germanium phosphate (LAGP) inorganic solid electrolyte to 500ML deionized water to make a suspension, add 0.6g chitosan, stir vigorously with the cellulose slurry, and mix well;

[0050] 3) Using the papermaking process to make paper from cellulose slurry containing solid electrolyte into a film, that is, a wet cellulose electrolyte composite diaphragm;

[0051] 4) The composite separator was dried in an oven at 50° C. to prepare a cellulose / solid electrolyte composite separator with a thickness of 30 μm.

[0052] The diaphragm acts as a diaphragm and an electrolyte at t...

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Abstract

The invention discloses an inorganic solid electrolyte-cellulose composite diaphragm and a preparation method thereof. The preparation method comprises the steps of S10, adding cellulose raw materialsinto deionized water to be immersed, and then performing grinding in a pulping machine to obtain a cellulose pulp solution with a micro-fiber structure; S20, adding an inorganic solid electrolyte into deionized water to prepare into a suspension liquid, then adding a wet strength agent and the cellulose pulp solution to be mixed uniformly; S30, performing papermaking and film forming on the cellulose pulp solution comprising the solid electrolyte by a papermaking process, namely, obtaining a wet cellulose electrolyte composite diaphragm; and S40, performing drying on the wet composite diaphragm in a drying oven to obtain the needed cellulose-solid electrolyte composite diaphragm. The prepared composite diaphragm is uniform in hole structural distribution, convenient to prepare, suitable for batch production, and high in heat resistance, high in wettability, high in ionic conductivity, high in breakdown resistance, and suitable for a lithium ion battery diaphragm; and meanwhile, the diaphragm is compounded with the inorganic solid electrolyte, so that an effect of the electrolyte can be played, and extra addition of an electrolyte solution is not needed.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an inorganic solid electrolyte-cellulose composite diaphragm and a preparation method thereof. Background technique [0002] The separator is one of the important components of lithium-ion batteries, which has the function of isolating the positive and negative electrodes to prevent short circuit and providing lithium ion transmission channels. Improving battery safety performance and reducing separator production costs are one of the main goals of future lithium-ion battery research. [0003] Cellulose is rich in resources, friendly to the environment, low in cost, and has excellent performance. It has been widely used in various fields. The cellulose itself is hydrophilic, and the cellulose separator has good wettability. At the same time, the cellulose separator has good thermal stability. 300 Thermal shrinkage does not occur below ℃. However, the current cellulose separat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/44H01M50/446
CPCH01M50/44H01M50/4295H01M50/403Y02E60/10
Inventor 刘丹宪黄杰俞会根
Owner BEIJING WELION NEW ENERGY TECH CO LTD
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