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Method for preparing battery diaphragm through in-situ reaction

A separator and battery technology, applied in the field of separators and their preparation methods and batteries using the same, can solve the problems of unsatisfactory safety of lithium ion batteries, low thermal deformation temperature, low mechanical properties and the like

Active Publication Date: 2015-03-04
LONG POWER SYST SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, whether it is dry stretching or wet extraction, many tedious process steps are involved
On the one hand, the thickness and uniformity of the diaphragm are not easy to control due to stretching. On the other hand, the pore-making project is difficult, and the number and uniformity of the holes are not easy to control.
In addition, polyolefin materials have a relatively low heat distortion temperature (the melting temperature of PE is about 120-130°C, and the melting temperature of PP is between 130-160°C) and relatively low mechanical properties, which make them sensitive to lithium ions. The safety of batteries is not very ideal, thus limiting the large-scale application of corresponding batteries in the field of power transportation
To sum up, the manufacture of organic polyolefin separators has high process cost and difficult pore-forming technology. In addition, it is difficult to control and adjust the thickness and uniformity of the separator and the uniformity of the pores, and the mechanical properties and thermal stability of the separator are relatively poor. Difference

Method used

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  • Method for preparing battery diaphragm through in-situ reaction
  • Method for preparing battery diaphragm through in-situ reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1PEGDMA-PTEVS-SiO 2 Diaphragm (with DBP treatment)

[0044] The first step to synthesize PTEVS oligomer precursor

[0045] Put 50.0 grams of TEVS monomer and 0.4018 grams of AIBN initiator into 500 milliliters of N 2 In a round bottom flask and stirred for 30 minutes, the flask was heated to 62 ° C and continued to stir for 3 days to polymerize to generate the PTEVS oligomer precursor, and cooled to room temperature.

[0046] The second step of cross-linking polymerization to form a composite separator

[0047] 15.0 grams of PTEVS oligomer precursors synthesized in the first step, PEGDMA oligomers (M n =550) 15.0 grams, AIBN initiator 0.1055 grams, with the nano-SiO of 1% silane coupling agent process 2 (Particle size range 50-300nm) 20.0 grams and 50.0 grams of plasticizer DBP are stirred and mixed to form a uniform and viscous mixed solution, and the mixed solution is evenly coated on the polyester film carrier with a scraper coater, and the coated prod...

Embodiment 2

[0050] Example 2POEM-PTEVS-PEGDME-Al 2 o 3 Diaphragm (with DBP treatment)

[0051] The first step of synthesizing the PTEVS oligomer precursor is the same as in Example 1 or using similar steps.

[0052] The second step of cross-linking polymerization to form a composite separator

[0053] With 5 grams of PTEVS oligomer precursors synthesized in the first step in embodiment 1, PEGDME oligomer (M n =500) 11.25 grams, POEM oligomer (M n =500) 26.125 grams, AIBN initiator 0.0966 grams, with the nanometer Al of 1% aluminate coupling agent process 2 o 3 (Particle size range 70-300nm) 28.25 grams and 70.63 grams of plasticizer DBP were stirred and mixed to form a uniform and viscous mixed solution. The mixed solution was evenly coated on the polyester film with a scraper coater, and the coated polyester film was heated. The ester film carrier was brought to 80°C and kept at the temperature for 3 hours to react, and the cross-linked separator was dried and peeled off from the p...

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Abstract

The invention discloses a method for preparing a diaphragm used for a chemical battery through in-situ reaction (polymerization / cross-linking), and a battery prepared from the diaphragm. The method comprises: (1) dispersing at least one oligomer precursor or monomer with reaction activity in a plasticizer without reaction activity to form a molecule-level uniformly-mixed mixture; (2) adding an initiator in the mixture, and uniformly mixing; (3) coating the liquid mixture to form a film; (4) heating or irradiating the mixture film containing the initiator to generate in-situ polymerization / cross-linking reaction, and drying to form a diaphragm; and (5) extracting the plasticizer in the diaphragm with a solvent, and drying the diaphragm. The method provided by the invention is easy to control the thickness and uniformity of the diaphragm through the single coating process, and is easy to form holes through the plasticizer extraction process, and the diaphragm is improved in the mechanical performance and the thermal stability by polymerizing / cross-linking and doping inorganic nanoscale fillers. The method provided by the invention is simple in process operation, low in equipment and process cost, and easy to realize industrialization.

Description

technical field [0001] The invention relates to the field of electrochemical batteries, in particular to a diaphragm of a lithium ion battery, a preparation method thereof and a 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 vehicles. The developmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16
CPCY02E60/10
Inventor 黄碧英孙喜梅
Owner LONG POWER SYST SUZHOU