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Modified polyolefin membrane coated with silicon dioxide layer and preparation method thereof

A polyolefin-based, silica-based technology, applied in separators/films/diaphragms/spacer elements, electrical components, non-aqueous electrolyte batteries, etc. Simple process and improved wettability

Inactive Publication Date: 2017-01-11
珠海泰坦储能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method is complex and expensive

Method used

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  • Modified polyolefin membrane coated with silicon dioxide layer and preparation method thereof
  • Modified polyolefin membrane coated with silicon dioxide layer and preparation method thereof
  • Modified polyolefin membrane coated with silicon dioxide layer and preparation method thereof

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Experimental program
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Embodiment Construction

[0021] (1) Add 3 mL of water, 40 mL of ethanol, 2 mL of ammonia water, and 1 g of Tween 80 into a beaker, stir well, then add 1 mL of tetraethyl orthosilicate and stir well.

[0022] (2) Soak the PP diaphragm into the mixed solution of (1) above and soak for 2 hours.

[0023] (3) Rinse the soaked PP diaphragm several times with water and ethanol respectively.

[0024] (4) Dry the washed PP diaphragm at 60°C.

[0025] (5) The PP diaphragm coated with a silicon dioxide layer prepared under the conditions of the present invention was measured for its thermal shrinkage performance at 150° C. (see attached figure 2 ) and the wettability of the electrolyte are greatly improved (see attached image 3 ).

[0026] (6) Assembling the diaphragm into a lithium-sulfur battery, in the voltage range of 1.7-2.8V, the test shows that the material has excellent rate performance (see attached Figure 4 ). The initial discharge capacity of the separator is 937mAh g-1 at 0.2C, and the capaci...

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Abstract

The invention relates to a modified polyolefin membrane coated with a silicon dioxide layer and a preparation method thereof. The method comprises the following steps of: uniformly mixing ammonium hydroxide, water, ethyl alcohol and Tween 80; adding tetraethoxysilane; uniformly stirring; adding a polyolefin membrane; soaking for a period of time, and then taking out, cleaning and drying, thereby acquiring the product. According to the method provided by the invention, the technique is simple and convenient, the modified polyolefin membrane has no or less pollution to environment, the energy consumption is low, the application scope is wide and the performance is excellent when the prepared modified membrane is applied to a lithium sulfur battery.

Description

technical field [0001] The invention relates to a modified polyolefin diaphragm covered with a silicon dioxide layer and a preparation method thereof. Background technique [0002] As a key safety component of lithium-ion batteries, the separator has a rich pore structure, and its function is to block the contact between the positive and negative electrodes and transmit lithium ions. At present, the commercial separators of lithium-ion batteries are mostly made of PP, PE, PP / PE / PP materials, but the disadvantage is that the electrolyte of polyolefin materials has poor liquid retention, which is not conducive to improving the high-power discharge performance of the battery. In addition, the heat resistance of polyolefin materials is poor, and the closed cell temperature of PE separator is about 135°C. After this temperature, the pores of the separator are closed, lithium ions cannot pass through, and the battery cannot be discharged externally; PP separator has slightly bette...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403H01M50/417H01M50/446H01M50/489
CPCH01M10/052H01M50/40H01M50/403H01M50/409H01M50/446H01M50/449Y02E60/10
Inventor 王子冠刘长树张德峰宗军郑罡黄玉代李静
Owner 珠海泰坦储能科技有限公司
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