High-strength low-shrinkage lithium ion battery diaphragm and preparation method thereof

A lithium-ion battery, low-shrinkage technology, applied in the direction of secondary batteries, battery pack parts, circuits, etc., can solve the problems of easy shrinkage and low strength, and achieve reduced thermal shrinkage, improved mechanical strength, and good mechanical strength Effect

Pending Publication Date: 2021-01-22
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-strength and low-shrinkage lithium-ion battery diaphragm preparation method for the technical defects of low mechanical strength and easy shrinkage at high temperature of the wet-process lithium-ion battery diaphragm in the prior art

Method used

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  • High-strength low-shrinkage lithium ion battery diaphragm and preparation method thereof

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Effect test

Embodiment 1

[0025] A preparation method of a lithium-ion battery diaphragm with high strength and low shrinkage, comprising the following steps:

[0026] Step 1: High molecular weight polyethylene (VH150U / VH035, Daehan Petrochemical Co., Ltd.), calcium sulfate whiskers (SXY-S-011 Sinopec), rare earth coupling agent (DN-9311, Nanjing Daoning Chemical Co., Ltd. company) and paraffin oil (Zhejiang Zhengxin Petroleum Technology Co., Ltd.) were added to the stirring tank according to the mass-to-number ratio of 25:2:1:72, and mixed at 80°C to obtain a mixture;

[0027] Among them, the weight-average molecular weight of high molecular weight polyethylene is 600,000, and the average aspect ratio of the whiskers of calcium sulfate whiskers is 20-40;

[0028] Step 2: extruding the obtained mixture through a twin-screw extruder to form a homogeneous blend;

[0029] Wherein, the temperature of the twin-screw extruder is 190° C., and the screw speed is 60 rpm;

[0030] Step 3: cooling and shaping t...

Embodiment 2

[0045] A preparation method of a lithium-ion battery diaphragm with high strength and low shrinkage, comprising the following steps:

[0046] Step 1: Add high molecular weight polyethylene, calcium sulfate whiskers, rare earth coupling agent and paraffin oil into the mixing tank according to the ratio of parts by mass of 25:3:2:70, and mix at 80°C to obtain a mixture;

[0047] Wherein, the weight-average molecular weight of high molecular weight polyethylene is 1 million, and the whisker average aspect ratio of calcium sulfate whisker is 20-40;

[0048] Step 2: extruding the obtained mixture through a twin-screw extruder to form a homogeneous blend;

[0049] Wherein, the temperature of the twin-screw extruder is 195° C., and the screw speed is 68 rpm;

[0050] Step 3: cooling and shaping the obtained homogeneous blend through cooling and shaping rollers to obtain cast sheets;

[0051] The temperature of the cooling and setting roller is 18°C, and the speed of the cooling and...

Embodiment 3

[0065] A preparation method of a lithium-ion battery diaphragm with high strength and low shrinkage, comprising the following steps:

[0066] Step 1: Add high molecular weight polyethylene, calcium sulfate whiskers, rare earth coupling agent and paraffin oil into the mixing tank according to the ratio of parts by mass of 26:4:2:68, and mix at 80°C to obtain a mixture;

[0067] Wherein, the weight-average molecular weight of high-molecular-weight polyethylene is 1.2 million, and the average aspect ratio of the whiskers of calcium sulfate whiskers is 20-40;

[0068] Step 2: extruding the obtained mixture through a twin-screw extruder to form a homogeneous blend;

[0069] Wherein, the temperature of the twin-screw extruder is 205° C., and the screw speed is 70 rpm;

[0070] Step 3: cooling and shaping the obtained homogeneous blend through cooling and shaping rollers to obtain cast sheets;

[0071] The temperature of the cooling and setting roller is 15°C, and the speed of the ...

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Abstract

The invention discloses a high-strength low-shrinkage lithium ion battery diaphragm preparation method, which comprises the following steps: 1, mixing high molecular weight polyethylene, inorganic whiskers, a coupling agent and paraffin oil at a high temperature to obtain a mixture; 2, blending the obtained mixture at a high temperature to form a homogeneous blend; 3, cooling and shaping the obtained homogeneous blend to obtain a cast sheet; and 4, sequentially carrying out longitudinal stretching, primary transverse stretching, extraction, secondary transverse stretching, heat setting and winding processes on the obtained cast sheet to obtain the lithium ion battery diaphragm. According to the invention, the prepared lithium ion battery diaphragm has good mechanical strength and high-temperature shrinkage resistance; and the thickness of the lithium ion battery diaphragm is 5-25 [mu]m, compared with the existing lithium ion battery diaphragm, the mechanical strength of the lithium ionbattery diaphragm is improved by about 30%, and the thermal shrinkage rate is obviously reduced.

Description

technical field [0001] The invention relates to the technical field of battery separators, in particular to a lithium-ion battery separator with high strength and low shrinkage and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in the fields of electronic communication, energy storage, and power supply. They are mainly composed of positive electrodes, negative electrodes, electrolytes, and battery separators. Among them, the battery separator is non-conductive and is located between the positive and negative electrodes to prevent positive and negative electrodes. The latter is short-circuited due to contact, and at the same time allows the electrolyte ions to pass through, thereby generating current. The current battery separator is mostly a polyolefin film with a microporous structure, and its performance determines the interface structure and internal resistance of the battery, which directly affects the capacity of the bat...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/446H01M10/0525B29C48/00B29C48/08
CPCH01M10/0525B29C48/0018B29C48/08Y02E60/10
Inventor 袁海朝徐锋杨欢马文献
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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