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Preparation method of separators of lithium power batteries

A lithium battery separator and power technology, applied in the field of preparation of power lithium battery separator, can solve problems such as poor uniformity and consistency, achieve stable discharge current, uniform pore size, and solve the effect of product batch uniformity

Inactive Publication Date: 2016-04-20
JIANGSU ANREDA NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the uniformity and consistency of domestically produced lithium battery separator products are poor. Therefore, it is very important to develop high-quality, uniform pore size, and uniform light transmission power lithium battery separators.

Method used

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  • Preparation method of separators of lithium power batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: A method for preparing a power lithium battery separator of the present invention, the specific operation steps are as follows:

[0018] Step a. Selection of raw materials: The raw materials are selected from polypropylene with high molecular weight and narrow molecular weight distribution, the melt flow ratio is 14g / 10min, and the melt index is 2.4;

[0019] Step b. Casting extrusion: The melt extrusion temperature is 225°C, the thickness of the casting extrusion is uniform, and the thickness deviation is controlled at 1%, and a polypropylene film with high resilience and high strength is produced by casting;

[0020] Step c. Cooling and stretching orientation crystallization: Let the melted and extruded polypropylene be oriented and crystallized under the speed of the casting roll. The number of casting rolls is 6, and the speed ratios of the 6 casting rolls are 1, 1.01, and 1.01 respectively. , 1, 1, 1.01, the temperature of the casting roll is 90℃, the die openi...

Embodiment 2

[0023] Embodiment 2: A method for preparing a power lithium battery separator of the present invention, the specific operation steps are as follows:

[0024] Step a. Selection of raw materials: the raw materials are selected from polypropylene with high molecular weight and narrow molecular weight distribution, the melt flow ratio is 16g / 10min, and the melt index is 3.5;

[0025] Step b. Casting extrusion: The melt extrusion temperature is 230°C, the thickness of the casting extrusion is uniform, the thickness deviation is controlled at 1%, and the polypropylene film with high resilience and high strength is produced by casting;

[0026] Step c. Cooling and stretching orientation crystallization: Let the melted and extruded polypropylene be oriented and crystallized at the speed of the casting roll. The number of casting rolls is 6, and the speed ratios of the 6 casting rolls are 1, 1.03, and 1.03 respectively. , 1.03, 1.03, 1.01, the temperature of the 6 casting rolls are 75℃, 75℃, ...

Embodiment 3

[0029] Embodiment 3: A method for preparing a power lithium battery separator of the present invention, the specific operation steps are as follows:

[0030] Step a. Selection of raw materials: the raw materials are selected from polypropylene with high molecular weight and narrow molecular weight distribution, the melt flow ratio is 16g / 10min, and the melt index is 3.5;

[0031] Step b. Casting extrusion: The melt extrusion temperature is 230°C, the thickness of the casting extrusion is uniform, the thickness deviation is controlled at 1%, and the polypropylene film with high resilience and high strength is produced by casting;

[0032] Step c. Cooling and stretching orientation crystallization: Let the melted and extruded polypropylene be oriented and crystallized under the speed of the casting roll. The number of casting rolls is 6, and the speed ratios of the six casting rolls are 1, 1.05, and 1.05 respectively. , 1.05, 1.05, 1.01, the temperature of the 6 casting rolls are respe...

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Abstract

The invention relates to a preparation method of separators of lithium power batteries. The method comprises specific operation steps as follows: a, selection of raw materials: raw materials are selected from polypropylene raw materials having the high molecular weight and the narrow molecular weight distribution; b, tape casting and extrusion: tape casting and extrusion are performed, and the thickness is controlled to be uniform; c, cooling stretching and oriented crystallization: melt-extruded polypropylene is subjected to oriented crystallization under the traction of the tape casting roller speed; d, heat treatment crystallization: tape-cast films are placed into a large oven adopting circulating air; e, stretching and hole forming: films subjected to heat treatment recrystallization are sequentially subjected to preheating, multi-point cold stretching, multi-point hot stretching and high-temperature thermoforming. The technical process of the preparation method is simple and reasonable, the obtained separators of the lithium power batteries have the uniform hole diameter, the small hole diameter sinuosity and uniform light transmission, and discharging currents of the lithium power batteries are stable.

Description

Technical field [0001] The invention relates to a method for preparing a power lithium battery diaphragm. Background technique [0002] According to relevant statistics, from January 2015 to October 2015, my country’s cumulative production of new energy vehicles was 206,900, a three-fold increase over the same period last year. According to this growth trend, the production and sales volume of new energy vehicles in my country this year will exceed 300,000; by 2016, the cumulative production of new energy vehicles may exceed 500,000. [0003] At present, the power lithium battery, new energy vehicle industry, and distributed power generation and energy storage are facing many problems in policies, products, markets, and capital. The market for high-quality power lithium battery products is in short supply. With the gradual promotion of new energy vehicles, there will be a huge demand for power lithium battery materials in the future. However, the current domestic production of li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C67/20B29C71/02B29L7/00B29K23/00
CPCB29C67/20B29C71/02B29K2023/12B29L2007/00
Inventor 史新昆王维金苗张东晖
Owner JIANGSU ANREDA NEW MATERIAL
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