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A kind of sodium alginate-based lithium battery diaphragm and preparation method thereof

A lithium battery diaphragm and sodium alginate technology, which is applied to battery pack components, circuits, electrical components, etc., can solve problems such as limiting ion conductivity, battery short circuit, size shrinkage, etc., achieve high ion conductivity and increase absorption , The effect of improving the magnification performance

Active Publication Date: 2016-04-13
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Of course, there are also many disadvantages: (1) poor electrolyte wetting performance and low electrolyte absorption rate, which limits the improvement of ionic conductivity, which is not conducive to the rapid charge and discharge of lithium batteries; (2) poor thermal dimensional stability, at high temperatures at 120 o Significant dimensional shrinkage occurs at C, and a short circuit occurs inside the battery
However, as far as we know, there are no reports on alginate-based lithium battery separators so far.

Method used

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  • A kind of sodium alginate-based lithium battery diaphragm and preparation method thereof
  • A kind of sodium alginate-based lithium battery diaphragm and preparation method thereof
  • A kind of sodium alginate-based lithium battery diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 1.5g of sodium alginate and 1.5g of polyethylene oxide and dissolve them in 97g of deionized water, and stir magnetically for 2 hours to obtain a uniform sodium alginate / polyethylene oxide mixed solution. Take out 2mL of the mixed solution and place it in a syringe with a needle inner diameter of 1.2mm. Aluminum foil is used as the receiving device, and the preset spinning conditions are: a fixed voltage of 15kV, a fixed distance of 10cm, and a fixed solution flow rate of 0.5mL / h. After spinning, the fiber membrane was compacted with a pressure of 8 MPa to obtain a sodium alginate / polyoxyethylene composite non-woven membrane with a thickness of 30 μm.

Embodiment 2

[0022] 2g of sodium alginate and 1g of polyvinyl alcohol were weighed and dissolved in 80g of deionized water, and magnetically stirred for 3 hours to obtain a uniform sodium alginate / polyvinyl alcohol mixed solution. Take out 2.5mL of the resulting mixed solution into a syringe with a needle inner diameter of 0.8mm. Aluminum foil is used as the receiving device, and the preset spinning conditions are: a fixed voltage of 30kV, a fixed distance of 15cm, and a fixed solution flow rate of 1mL / h. After spinning, the fiber membrane was compacted with a pressure of 10 MPa to obtain a polysodium alginate / polyvinyl alcohol composite non-woven membrane with a thickness of 50 μm.

Embodiment 3

[0024] Weigh 3g of sodium alginate, 2g of carrageenan and 2g of nano-silicon dioxide and dissolve them in 150g of deionized water, and magnetically stir for 4 hours to obtain a uniform mixed solution of sodium alginate / carrageenan / nano-silicon dioxide. Take 4 mL of the resulting mixed solution into a syringe with a needle inner diameter of 1.6 mm. Aluminum foil is used as the receiving device, and the preset spinning conditions are: a fixed voltage of 25kV, a fixed distance of 20cm, and a fixed solution flow rate of 2mL / h. After spinning, the fiber membrane was compacted with a pressure of 5 MPa to obtain a sodium alginate / carrageenan / nano-silica composite non-woven membrane with a thickness of 70 μm.

[0025] The present invention is not limited to the above embodiments, and can be prepared according to the material ratio, spinning voltage, spinning temperature, receiving distance, rolling pressure, rolling time and rolling temperature to meet the requirements of the lithium ...

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Abstract

The invention belongs to the technical field of lithium battery separators, in particular to a sodium alginate-based lithium battery separator and a preparation method thereof. The lithium battery diaphragm of the present invention is prepared by using a sodium alginate-based composite non-woven film as a base material through an electrospinning process. The sodium alginate-based lithium battery diaphragm prepared by the present invention has a thickness of 10 μm-300 μm, a fiber diameter of 20 nm-2000 nm, an air permeability of 1 s-600 s / 100 cc, a porosity of 40%-90%, and a pore diameter range of 0.02 μm-4 μm , The electrolyte absorption rate is 150%-900%, and the thermal stability is excellent, at 150o? The dimensional shrinkage rate at C temperature is less than 0.5%. The sodium alginate-based lithium battery diaphragm provided by the present invention has excellent performance, high ionic conductivity, suitable mechanical strength and excellent electrochemical stability, and improves the interface stability between it and positive and negative electrode materials , greatly improving the rate performance, long cycle life and safety performance of lithium batteries. At the same time, the preparation process provided by the invention is simple and easy, the production cost is low, and it is easy to produce on a large scale.

Description

technical field [0001] The invention relates to a sodium alginate-based lithium battery diaphragm; the invention also relates to a preparation method of the above-mentioned sodium alginate-based lithium battery diaphragm. Background technique [0002] Lithium batteries are mainly composed of positive and negative electrode materials, electrolyte and separator. The separator is located between the positive and negative materials of the lithium-ion battery and is one of the important components of the lithium-ion battery. The role of the diaphragm is very important. It plays an important role in isolating the positive and negative electrodes, preventing the internal short circuit of the battery, absorbing the electrolyte, and completing the rapid transmission of lithium ions between the positive and negative electrodes during the electrochemical charge and discharge process. With the continuous development of lithium batteries, the requirements for separator performance are g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16C08B37/04H01M50/403H01M50/44
CPCY02E60/10
Inventor 崔光磊张建军孔庆山岳丽萍刘志宏姚建华
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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