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Preparation method of multilayer ceramic composite membrane for improving safety of secondary battery

A secondary battery and ceramic composite technology, applied in the field of secondary batteries, can solve the problems of reducing ionic conductivity and affecting ionic conductivity, and achieve the effects of avoiding short circuits, high ionic conductivity, and ensuring integrity

Active Publication Date: 2013-03-27
LONG POWER SYST SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, U.S. Patent No. 7,875,380B2 uses electrostatic spraying to improve the safety of the diaphragm. However, using the coating process can easily bring about additional disadvantages such as closed pores in some areas of the diaphragm, resulting in a decrease in the ionic conductivity of the entire diaphragm, which ultimately affects the ionic conductivity. rate, battery rate and cycle performance

Method used

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  • Preparation method of multilayer ceramic composite membrane for improving safety of secondary battery

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Effect test

Embodiment 1

[0044] Embodiment 1 (PP / Al 2 o 3 ) / PE / (PP / Al 2 o 3 ) three-layer composite diaphragm

[0045] (1) Prepare the first viscous mixture. Add 35wt% HDPE (weight average molecular weight = 1×10 6 , Molecular weight distribution index = 3.2), 0.5% of the weight of HDPE antioxidant β-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate was put into the extruder with stirring device Mix in the machine hopper, and at the same time add 65wt% paraffin oil through the side feeding port with a metering pump, and melt and knead at 200 °C through a co-rotating twin-screw extruder.

[0046] (2) Prepare the second viscous mixture. Add 28wt% PP (weight average molecular weight = 6×10 5 , molecular weight distribution index = 3.6), accounting for 0.5% by weight of PP antioxidant β-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate and 7wt% Al 2 o 3 (Particle size distribution 50-100nm, surface treated by 1wt% aluminate coupling agent) put into another extruder hopper with stirrin...

Embodiment 2

[0051] Embodiment 2 (PP / Al 2 o 3 ) / PP / (PP / Al 2 o 3 ) three-layer composite diaphragm

[0052] (1) Prepare the first viscous mixture. Mix 35wt% PP (weight average molecular weight = 1×10 5 , molecular weight distribution = 4.1), 0.5% of PP weight antioxidant β-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate was put into the extruder with stirring device Mix in the hopper, and at the same time add 65wt% paraffin oil through the side feeding port with a metering pump, and melt and knead at 210°C through a co-rotating twin-screw extruder.

[0053] (2) Prepare the second viscous mixture. Add 28wt% PP (weight average molecular weight = 6×10 5 , molecular weight distribution = 3.6), accounting for 0.5% by weight of PP antioxidant β-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate and 7wt% Al 2 o 3 (Particle size distribution 50-100nm, surface treated by 1wt% aluminate coupling agent) put into another extruder hopper with stirring device and mix evenly, and at ...

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Abstract

The invention discloses a preparation method of a multilayer ceramic composite membrane for improving the safety of a secondary battery. The preparation method comprises the following steps of: (1) sufficiently mixing first high molecular weight polyolefin, an antioxidant and low molecular weight organic matters in a double-screw extruder to form a sticky mixture as a core layer; (2) sufficiently mixing second high molecular weight polyolefin, an antioxidant and low molecular weight organic matters and a non-conductive nanometer inorganic ceramic material in another co-rotating double-screw extruder to form a sticky mixture as a surface layer; (3) carrying out coextrusion through three layers of die orifices according to the distribution forms in the step (1) and the step (2) to form three layers of strip-type extrudate, and carrying out two-way stretching on the strip-type extrudate to form a thin membrane; and (4) extracting low molecular weight organic matters in the thin membrane by a solvent, and then carrying out drying as well as thermal processing and shaping to obtain the porous three-layer nanometer ceramic composite membrane. The composite membrane prepared by using the preparation method has the advantages of higher ionic conductivity, favourable wettability with carbonic ester electrolyte, favourable thermal stability and mechanical property and higher membrane rupture temperature.

Description

technical field [0001] The invention relates to the field of secondary batteries, in particular to a lithium-ion battery ceramic composite diaphragm, a preparation method thereof, and a secondary battery using the same. Background technique [0002] Lithium-ion batteries have a history of more than 20 years since they were developed and commercialized by Sony Corporation of Japan in 1990. Due to its higher volume specific energy, weight specific energy and good environmental protection, it is gradually replacing traditional lead-acid batteries, nickel-cadmium and nickel-metal hydride batteries, and is widely used in portable 3C electronic devices such as mobile phones and notebook computers. It quickly occupied a large market and developed rapidly. In recent years, the demand for smaller volume and higher energy density of electronic products has become stronger and stronger. In addition, lithium-ion batteries are used in electric tools, electric bicycles and hybrid vehicl...

Claims

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Application Information

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IPC IPC(8): H01M2/16
CPCY02E60/12Y02E60/10
Inventor 黄碧英孙喜梅
Owner LONG POWER SYST SUZHOU
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