Lithium ion battery diaphragm and method for preparing same

Abstract

The invention discloses a method for preparing a lithium ion battery diaphragm. The method is characterized by comprising the following steps: S1, preparation of 4-((4-(allyloxy)phenyl)sulfonyl)phenolmodified linear polyboron silicone; S2, diaphragm preparation; and S3, diaphragm surface modification. The invention also discloses a lithium ion battery diaphragm prepared according to the method for preparing the lithium ion battery diaphragm. The lithium ion battery diaphragm disclosed by the invention has large porosity, high mechanical strength and ionic conductivity, excellent resistance to electrolyte corrosion and high temperature, good wettability and chemical stability, and excellent charge-discharge rate performance.

Description

technical field

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

[0002] In recent years, with the rapid development of portable electronic devices, electric vehicles, and grid energy storage technologies, the demand for high-energy-density, high-safety batteries and energy storage systems has become increasingly urgent. As a common energy storage device, lithium-ion batteries have higher specific energy than traditional rechargeable batteries, faster charge and discharge, longer cycle life, no memory effect, low self-discharge rate, good safety performance and It is widely used in the fields of electronic products such as notebook computers, mobile phones, video cameras, and cameras, as well as electric vehicles, aerospace, and submarines, due to its low environmental pollution and other characteristics. The diaphragm is one of the key components of...

Examples

Embodiment 1

[0029] A preparation method for a lithium-ion battery diaphragm, characterized in that it comprises the steps of:

[0030]Step S1, 4-((4-(allyloxy)phenyl)sulfonyl)phenol modified linear polyborosiloxane: linear polyborosiloxane 30g, 4-((4-(ene Propoxy)phenyl)sulfonyl)phenol 2g and chloranil 1g were added to 100g of tetrahydrofuran, stirred and reacted at 90°C for 2 hours, then gradually raised the temperature to 120°C within 1 hour, and continued to stir and react for 1 hour, Finally, the polymer obtained is precipitated in a 3% sodium hydroxide solution in a mass fraction, and the product is washed with water for 3 times, then washed with methanol for 3 times, and finally the methanol is removed by rotary evaporation to obtain 4-((4-(ene Propoxy)phenyl)sulfonyl)phenol modified linear polyborosiloxane;

[0031] Step S2, film preparation: 10 g of 4-((4-(allyloxy)phenyl)sulfonyl)phenol-modified linear polyborosiloxane, 1 g of vinyl-POSS, Polyethylene glycol 3g, 2,4-diamino-6-v...

Embodiment 2

[0035] A preparation method for a lithium-ion battery diaphragm, characterized in that it comprises the steps of:

[0036] Step S1, 4-((4-(allyloxy)phenyl)sulfonyl)phenol modified linear polyborosiloxane: linear polyborosiloxane 35g, 4-((4-(ene Add 2g of propoxy)phenyl)sulfonyl)phenol and 1g of 1,4-naphthoquinone into 120g of tetrahydrofuran, stir and react at 93°C for 2.5 hours, then gradually raise the temperature to 122°C within 1.2 hours, and continue stirring for 1.5 After hours, the polymer obtained in the mass fraction is precipitated in 3.5% sodium hydroxide solution, and then the product is washed with water for 4 times, and then washed with methanol for 4 times, and finally the methyl alcohol is removed by rotary evaporation to obtain 4-((4- (Allyloxy)phenyl)sulfonyl)phenol modified linear polyborosiloxane;

[0037] Step S2, film preparation: 10 g of 4-((4-(allyloxy)phenyl)sulfonyl)phenol-modified linear polyborosiloxane, 1 g of vinyl-POSS, Add 3g of hydroxypropyl ...

Embodiment 3

[0041] A preparation method for a lithium-ion battery diaphragm, characterized in that it comprises the steps of:

[0042] Step S1, 4-((4-(allyloxy)phenyl)sulfonyl)phenol modified linear polyborosiloxane: linear polyborosiloxane 40g, 4-((4-(ene Propoxy) phenyl) sulfonyl) phenol 2g, tetrachlorobenzoquinone 1g were added to 150g tetrahydrofuran, stirred and reacted at 95°C for 3 hours, then gradually raised the temperature to 125°C within 1.5 hours, and continued to stir and react for 2 hours, Finally, the polymer obtained is precipitated in 4% sodium hydroxide solution in mass fraction, and the product is washed 5 times with water, and then washed 5 times with methanol, and finally the methanol is removed by rotary evaporation to obtain 4-((4-(ene Propoxy)phenyl)sulfonyl)phenol modified linear polyborosiloxane;

[0043] Step S2, film preparation: 10 g of 4-((4-(allyloxy)phenyl)sulfonyl)phenol-modified linear polyborosiloxane, 1 g of vinyl-POSS, Add urea 3g, 2,4-diamino-6-viny...

technical field

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

[0002] In recent years, with the rapid development of portable electronic devices, electric vehicles, and grid energy storage technologies, the demand for high-energy-density, high-safety batteries and energy storage systems has become increasingly urgent. As a common energy storage device, lithium-ion batteries have higher specific energy than traditional rechargeable batteries, faster charge and discharge, longer cycle life, no memory effect, low self-discharge rate, good safety performance and It is widely used in the fields of electronic products such as notebook computers, mobile phones, video cameras, and cameras, as well as electric vehicles, aerospace, and submarines, due to its low environmental pollution and other characteristics. The diaphragm is one of the key components of...

Examples

Embodiment 1

[0029] A preparation method for a lithium-ion battery diaphragm, characterized in that it comprises the steps of:

[0030]Step S1, 4-((4-(allyloxy)phenyl)sulfonyl)phenol modified linear polyborosiloxane: linear polyborosiloxane 30g, 4-((4-(ene Propoxy)phenyl)sulfonyl)phenol 2g and chloranil 1g were added to 100g of tetrahydrofuran, stirred and reacted at 90°C for 2 hours, then gradually raised the temperature to 120°C within 1 hour, and continued to stir and react for 1 hour, Finally, the polymer obtained is precipitated in a 3% sodium hydroxide solution in a mass fraction, and the product is washed with water for 3 times, then washed with methanol for 3 times, and finally the methanol is removed by rotary evaporation to obtain 4-((4-(ene Propoxy)phenyl)sulfonyl)phenol modified linear polyborosiloxane;

[0031] Step S2, film preparation: 10 g of 4-((4-(allyloxy)phenyl)sulfonyl)phenol-modified linear polyborosiloxane, 1 g of vinyl-POSS, Polyethylene glycol 3g, 2,4-diamino-6-v...

Embodiment 2

[0035] A preparation method for a lithium-ion battery diaphragm, characterized in that it comprises the steps of:

[0036] Step S1, 4-((4-(allyloxy)phenyl)sulfonyl)phenol modified linear polyborosiloxane: linear polyborosiloxane 35g, 4-((4-(ene Add 2g of propoxy)phenyl)sulfonyl)phenol and 1g of 1,4-naphthoquinone into 120g of tetrahydrofuran, stir and react at 93°C for 2.5 hours, then gradually raise the temperature to 122°C within 1.2 hours, and continue stirring for 1.5 After hours, the polymer obtained in the mass fraction is precipitated in 3.5% sodium hydroxide solution, and then the product is washed with water for 4 times, and then washed with methanol for 4 times, and finally the methyl alcohol is removed by rotary evaporation to obtain 4-((4- (Allyloxy)phenyl)sulfonyl)phenol modified linear polyborosiloxane;

[0037] Step S2, film preparation: 10 g of 4-((4-(allyloxy)phenyl)sulfonyl)phenol-modified linear polyborosiloxane, 1 g of vinyl-POSS, Add 3g of hydroxypropyl ...

Embodiment 3

[0041] A preparation method for a lithium-ion battery diaphragm, characterized in that it comprises the steps of:

[0042] Step S1, 4-((4-(allyloxy)phenyl)sulfonyl)phenol modified linear polyborosiloxane: linear polyborosiloxane 40g, 4-((4-(ene Propoxy) phenyl) sulfonyl) phenol 2g, tetrachlorobenzoquinone 1g were added to 150g tetrahydrofuran, stirred and reacted at 95°C for 3 hours, then gradually raised the temperature to 125°C within 1.5 hours, and continued to stir and react for 2 hours, Finally, the polymer obtained is precipitated in 4% sodium hydroxide solution in mass fraction, and the product is washed 5 times with water, and then washed 5 times with methanol, and finally the methanol is removed by rotary evaporation to obtain 4-((4-(ene Propoxy)phenyl)sulfonyl)phenol modified linear polyborosiloxane;

[0043] Step S2, film preparation: 10 g of 4-((4-(allyloxy)phenyl)sulfonyl)phenol-modified linear polyborosiloxane, 1 g of vinyl-POSS, Add urea 3g, 2,4-diamino-6-viny...