Method for preparing heat-resistant liquid-holding lithium battery diaphragm

A lithium battery separator, heat-resistant technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of poor wettability, shorten battery life, accelerate lithium-ion battery damage, etc., and achieve the effect of strong heat resistance

Inactive Publication Date: 2019-05-21
江苏奔拓电气科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention is that the current lithium-ion battery has been gradually expanded to the field of electric bicycles and electric vehicles, and is developing in the direction of high power and high current. The working temperature of the diaphragm of the lithium-ion battery is also increased, and the diaphragm is easily Under the action of thermal expansion and contraction, the electrical insulation nanoparticles in the coating are peeled off, and the microporous structure of the separator is blocked under the high temperature working environment, which leads to the obstructio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] Preparation of primary alumina flakes:

[0028] A circular aluminum sheet with a diameter of 16 mm was placed in 100 mL of absolute ethanol for ultrasonic treatment for 8 min, and then the circular aluminum sheet was taken out and placed in 120 mL of 10% sodium hydroxide solution for ultrasonic treatment for 10 min, and the ultrasonic frequency was controlled to 30 kHz. The surface-treated aluminum flakes are obtained, and the surface-treated aluminum flakes are washed three times with deionized water to obtain anode aluminum flakes. The sheet is used as the anode, and the untreated high-purity aluminum sheet is placed in the mixed solution as the cathode, and polished at a voltage of 15V to obtain a polished anode aluminum sheet;

[0029] The graphite rod as the cathode and the above-mentioned polished anode aluminum sheet as the anode were placed in a beaker containing an oxalic acid solution with a mass fraction of 30%, the distance between the po...

Example Embodiment

[0036] Example 2

[0037] Preparation of primary alumina flakes:

[0038] A circular aluminum sheet with a diameter of 17 mm was placed in 110 mL of absolute ethanol for ultrasonic treatment for 9 min, and the circular aluminum sheet was taken out and placed in 135 mL of 10% sodium hydroxide solution for ultrasonic treatment for 11 min, and the ultrasonic frequency was controlled to 32 kHz. The surface-treated aluminum sheet is obtained, and the surface-treated aluminum sheet is washed with deionized water for 4 times to obtain an anode aluminum sheet. The sheet is used as the anode, and the untreated high-purity aluminum sheet is placed in the mixed solution as the cathode, and polished at a voltage of 17V to obtain a polished anode aluminum sheet;

[0039] The graphite rod was used as the cathode, and the above-mentioned polished anode aluminum sheet was used as the anode into a beaker containing an oxalic acid solution with a mass fraction of 30%. In a water bath, electro...

Example Embodiment

[0046] Example 3

[0047] Preparation of primary alumina flakes:

[0048] A circular aluminum sheet with a diameter of 18 mm was placed in 120 mL of absolute ethanol for ultrasonic treatment for 10 min, and the circular aluminum sheet was taken out and placed in 150 mL of 10% sodium hydroxide solution for ultrasonic treatment for 12 min, and the ultrasonic frequency was controlled to 35 kHz. The surface-treated aluminum sheet is obtained, and the surface-treated aluminum sheet is washed with deionized water for 5 times to obtain an anode aluminum sheet. The sheet is used as an anode, and the untreated high-purity aluminum sheet is placed in the mixed solution as a cathode, and polished at a voltage of 20V to obtain a polished anode aluminum sheet;

[0049] The graphite rod as the cathode and the above-mentioned polished anode aluminum sheet as the anode were placed in a beaker containing an oxalic acid solution with a mass fraction of 30%, the distance between the positive an...

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PUM

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Abstract

The invention discloses a method for preparing a heat-resistant liquid-holding lithium battery diaphragm and belongs to the technical field of lithium battery preparation. The battery diaphragm is mainly composed of aluminium oxide and silicon dioxide, the melting points of which are both above 1000 DEG C, the produced heat and the increased temperature are low during battery charging and discharging and the pore structure of the battery diaphragm is not influenced by high temperature expansion, so that the battery diaphragm has strong heat resistance; a shorter channel can be provided for ionconduction and the ion resistance is reduced by utilizing an aluminium oxide membrane with high porosity and a through-pore structure in the lithium battery diaphragm, so that the electrochemical performance is improved; and calcium lignosulfonate and acrylamide are grafted to obtain a graft copolymer and the graft copolymer is modified by dimethylamine and formaldehyde and reacted with N-vinyl pyrrolidone to obtain an amphoteric graft copolymer which can serve as an organic hygroscopic material to improve the wettability of the battery diaphragm to an electrolyte, so that the liquid absorption rate and the liquid-holding rate of a lithium battery are increased; and therefore, the lithium battery diaphragm has a broad application prospect.

Description

technical field [0001] The invention discloses a preparation method of a heat-resistant liquid-retaining lithium battery separator, belonging to the technical field of lithium battery preparation. Background technique [0002] In the structure of lithium batteries, the separator is one of the key inner components. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A separator with excellent performance plays an important role in improving the overall performance of the battery. The main function of the diaphragm is to separate the positive and negative electrodes of the battery, prevent the two electrodes from contacting and short circuit, and also have the function of allowing electrolyte ions to pass through. The separator material is non-conductive, and its physical and chemical properties have a great influence on the performance of ...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/423H01M50/431H01M50/491
CPCY02E60/10
Inventor 赵玲玲
Owner 江苏奔拓电气科技有限公司
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