A kind of ultra-low ash polypropylene and polypropylene lithium battery diaphragm material

A lithium battery separator and polypropylene technology, which is used in lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc. Mechanical properties, low dielectric loss, moisture resistance and no water absorption

Active Publication Date: 2022-04-29
SHANDONG CHAMBROAD PETROCHEMICALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As a general-purpose plastic material, polypropylene has good chemical stability, processing performance and relatively cheap price. However, ordinary polypropylene has a high ash content and poor thermal shrinkage. If the temperature is too high, the diaphragm will shrink or fuse, posing a safety hazard.

Method used

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  • A kind of ultra-low ash polypropylene and polypropylene lithium battery diaphragm material
  • A kind of ultra-low ash polypropylene and polypropylene lithium battery diaphragm material
  • A kind of ultra-low ash polypropylene and polypropylene lithium battery diaphragm material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Embodiment 1 prepares ultra-low ash polypropylene

[0062] In the Ziegler-Natta catalyst used in the present embodiment, the Ti content is 2.5wt%, the Mg content is 18.5wt%, the diisobutyl phthalate (DIBP) content is 8.3wt%, and the volatile matter is 2.9wt%. ;

[0063] Add propylene to the reactor, and add Ziegler-Natta catalyst, cocatalyst (triethylaluminum), electron donor Donor (CMMS), catalyst is added according to the output of 40kg polypropylene / g catalyst, triethylaluminum / Ti (Ti element in the catalyst) = 64

[0064] Ti element in the catalyst / propylene monomer=2.45, triethylaluminum / DONOR=3.18, stir evenly, control the reactor temperature at 72±1°C, the reaction pressure at 3.0-3.2MPa, and the hydrogen concentration at 800ppm. Thus, ultra-low ash polypropylene resin is obtained.

[0065] The obtained polypropylene resin properties are shown in Table 1,

[0066] Table 1 The performance of ultra-low ash polypropylene resin in Example 1 of the present applica...

Embodiment 2～8

[0070] According to the ratio in Table 3, add ultra-low ash polypropylene resin, antioxidant, and halogen absorbent into a 10L high-speed mixing mixer, mix for 30 minutes at normal temperature and pressure, and then extrude with a Coperion extrusion granulator. After granulation, the temperature of each section was controlled between 165-240° C., and the temperature of each section was shown in Table 2 to obtain a polypropylene resin material for a lithium battery separator.

[0071] Table 2 The temperature of each section of extrusion granulation in Examples 2 to 8 of the present application

[0072] zone 1 Zone 2 District 3 District 4 District 5 District 6 District 7 District 8 nose temperature / ℃ 175 180 175 180 180 175 180 185 190

[0073] Each group distribution ratio in the embodiment 2~8 of the present application of table 3

[0074]

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Abstract

The invention provides an ultra-low ash polypropylene, which is prepared according to the following steps: in a hydrogen atmosphere, propylene, Ziegler-Natta catalyst, triethylaluminum and an electron donor are mixed and reacted to obtain an ultra-low ash Polypropylene; Ti content is 2.5wt% in the described Ziegler-Natta catalyst, and Mg content is 18.5wt%, and diisobutyl phthalate content is 8.3wt%, and volatile matter is 2.9wt%; The described The molar ratio of Ti element to propylene in the Ziegler-Natta catalyst is (2-3):1. In the invention, the ultra-low ash content polypropylene resin obtained by improving the component vegetation of the catalyst is used to prepare the diaphragm material of the lithium battery. The membrane material prepared by the invention has low molecular weight and excellent heat resistance.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to an ultra-low ash polypropylene and a polypropylene lithium battery diaphragm material. 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 perfor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/06C08F4/649C08F4/646C08L23/12C08K5/134C08K5/526C08K5/098C08K3/26C08K13/02C08J5/18H01G2/00H01M10/052H01M50/417H01M50/406
CPCC08F110/06C08J5/18H01M10/052H01G2/00C08J2323/12C08K5/1345C08K5/526C08K5/098C08K3/26C08K13/02H01M50/403H01M50/411C08F4/6494C08F4/6465Y02E60/10
Inventor 李卫卫葛良国马丙建史会兵栾波
Owner SHANDONG CHAMBROAD PETROCHEMICALS CO LTD
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