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Sodium alginate-based lithium battery diaphragm and preparation method thereof

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

Active Publication Date: 2013-10-09
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) The electrolyte wetting performance is not good and the electrolyte absorption rate is low, which limits the improvement of ionic conductivity, which is not conducive to the rapid charge and discharge of lithium batteries; (2) The thermal dimensional stability is poor, and the temperature is high. 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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  • Sodium alginate-based lithium battery diaphragm and preparation method thereof
  • Sodium alginate-based lithium battery diaphragm and preparation method thereof
  • Sodium alginate-based lithium battery diaphragm and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

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

[0021]

Embodiment 2

[0023] Weighed 2 g of sodium alginate and 1 g of polyvinyl alcohol and dissolved them in 80 g of deionized water, and stirred for 3 h with magnetic force to obtain a uniform sodium alginate / polyvinyl alcohol mixed solution. Take 2.5 mL of the resulting mixed solution into a syringe with a needle inner diameter of 0.8 mm. Aluminum foil was used as the receiving device, and the preset spinning conditions were: a fixed voltage of 30 kV, a fixed distance of 15 cm, and a fixed solution flow rate of 1 mL / h. After spinning, the fiber membrane was compacted with a pressure of 10 MPa to obtain a polysodium alginate / polyvinyl alcohol composite nonwoven membrane with a thickness of 50 μm.

[0024]

Embodiment 3

[0026] Weighing 3 g sodium alginate, 2 g carrageenan and 2 g nano-silica were dissolved in 150 g deionized water, and stirred with magnetic force for 4 h to obtain a uniform sodium alginate / carrageenan / nano-silica mixture. solution. Take 4 mL of the resulting mixed solution into a syringe with a needle inner diameter of 1.6 mm. Aluminum foil was used as the receiving device, and the preset spinning conditions were: a fixed voltage of 25 kV, a fixed distance of 20 cm, and a fixed solution flow rate of 2 mL / 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.

[0027] 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 battery separa...

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Abstract

The invention belongs to the technical field of a lithium battery diaphragm, and particularly relates to a sodium alginate-based lithium battery diaphragm and a preparation method thereof. The lithium battery diaphragm adopts a sodium alginate-based composite nonwoven film as a base material and is prepared by adopting an electrostatic spinning process. The thickness of the prepared sodium alginate-based lithium battery diaphragm is 10 to 300 micrometers, the diameter of a fiber is 20nm to 2000nm, the ventilation is 1s to 600s / 100cc, the porosity is 40 to 90 percent, the aperture range is 0.02 to 4 micrometers, the absorption rate of the electrolyte is 150 to 900 percent, the heat stability is excellent, and the size shrinkage percentage at the temperature of 150DEG C is less than 0.5 percent. The sodium alginate-based lithium battery diaphragm is excellent in performance, high in ion electric conductivity, appropriate in mechanical strength and excellent in electrochemical stability; moreover, the interface stability between the diaphragm and a positive and negative material is improved, the rate capacity of a lithium battery can be greatly improved, the cycling life is long, and the safety performance is improved. Meanwhile, the preparation process is simple and easy, the production cost is low, and mass production can be easy to realize.

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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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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