Preparation method of PEO based polymer diaphragm and preparation method of primary battery with PEO based polymer diaphragm

A polymer and separator technology, applied in the field of lithium-ion energy storage batteries, can solve the problems affecting the safety performance of the battery, short circuit of positive and negative electrodes, poor mechanical properties, etc., and achieve the effects of good mechanical properties, stable discharge voltage, and excellent electrical properties.

Active Publication Date: 2018-04-13
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The diaphragm used in traditional primary batteries is made of cellulose microporous film (electrospinning) or PP diaphragm or PE diaphragm, which is soaked in a liquid electrolyte to absorb liquid. Because of its extremely poor mechanical properties, it is easily absorbed by the lithium formed on the surface of the lithium negative electrode. The dendrites are pierced, resulting in a short circuit between the positive and negative electrodes, which affects the safety performance of the battery

Method used

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  • Preparation method of PEO based polymer diaphragm and preparation method of primary battery with PEO based polymer diaphragm
  • Preparation method of PEO based polymer diaphragm and preparation method of primary battery with PEO based polymer diaphragm
  • Preparation method of PEO based polymer diaphragm and preparation method of primary battery with PEO based polymer diaphragm

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Embodiment 1

[0041] The steps are:

[0042] a. Dissolve 0.005 mol of polyethylene glycol PEG with a molecular weight of 2000 and 0.011 mol of isocyanatopropyl triethoxysilane (according to the functional group -OH, -NCO molar ratio 1:1.1) in tetrahydrofuran, under a nitrogen atmosphere at 60 ° C After reacting for 12 hours, the purification of the product is called: adding n-hexane with a ratio of 1:1 to the original solvent to the product, then performing suction filtration, washing twice with n-hexane, and then suction filtration, finally collecting the solid and placing it at 40°C Vacuum drying in oven to obtain intermediate product A;

[0043]b. Mix 0.005mol of intermediate product A with 30% mass fraction of silica hydrosol, wherein the molar ratio of intermediate product A to silica hydrosol is 2:1, and react at 80°C under nitrogen atmosphere After 48 hours, the product was purified: partly evaporated the solvent, then added a mixed solution of n-hexane and chloroform with a volume ...

Embodiment 2

[0047] The steps are:

[0048] a. Dissolve 0.005 mol of polyethylene glycol PEG with a molecular weight of 2000 and 0.0105 mol of isocyanatopropyltriethoxysilane (according to the functional group -OH, -NCO molar ratio 1:1.05) in tetrahydrofuran, 62 ° C under nitrogen atmosphere After reacting for 13 hours, the purification process of the product is called: adding n-hexane with a ratio of 1:1 to the original solvent to the product, then performing suction filtration, washing twice with n-hexane, and then suction filtration, finally collecting the solid and placing it at 40°C Vacuum drying in oven to obtain intermediate product A;

[0049] b. Mix 0.005mol of intermediate product A with 30% mass fraction of silica hydrosol, wherein the molar ratio of intermediate product A to silica hydrosol is 2:1.1, and react at 82°C under nitrogen atmosphere After 50 hours, the product was purified: partly evaporated the solvent, then added a mixed solution of n-hexane and chloroform with a ...

Embodiment 3

[0053] The steps are:

[0054] a. Dissolve 0.005 mol of polyethylene glycol PEG with a molecular weight of 2000 and 0.012 mol of isocyanatopropyltriethoxysilane (according to the functional group -OH, -NCO molar ratio 1:1.2) in tetrahydrofuran, under a nitrogen atmosphere at 65 ° C Reaction for 14 hours, product purification is called: add n-hexane with a ratio of 1:1 to the original solvent to the product, then carry out suction filtration operation, wash twice with n-hexane, and then suction filtration, finally collect the solid and store it at 40°C Vacuum drying in oven to obtain intermediate product A;

[0055] b. Mix 0.005mol intermediate product A with 25% mass fraction of silica hydrosol, wherein the molar ratio of intermediate product A to silica hydrosol is 2:1.2, and react at 85°C under nitrogen atmosphere After 52 hours, the product was purified: partly evaporated the solvent, then added a mixed solution of n-hexane and chloroform with a volume ratio of 1:1, centri...

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Abstract

The invention discloses a preparation method of a PEO based polymer diaphragm. The preparation method of the PEO based polymer diaphragm is characterized by comprising the following steps: polyethylene glycol PEG and isocyanate silane coupling agents are placed in a solvent to make the polyethylene glycol completely react; after the obtained product is purified, the purified product is mixed withsilicon dioxide hydrosol according to the molar ratio of the contained silicon dioxide to react completely, wherein the molar ratio is 2:1 to 2:1.5; after the obtained product is purified, the purified product and polypropylene glycol PPG are placed in the solvent according to the ratio of 1:8 to 1:10 to react completely; and the PEO based polymer diaphragm is obtained by drying and diaphragm forming. The PEO based polymer diaphragm prepared by the invention has excellent mechanical properties and safety performance; and the primary battery prepared with the PEO based polymer diaphragm has long storage life, stable discharge, safety and reliability.

Description

technical field [0001] The invention relates to a lithium ion energy storage battery, in particular to a method for preparing a PEO-based polymer diaphragm and a method for preparing a metal oxide lithium primary battery. Background technique [0002] Because the cathode material of lithium manganese dioxide battery is a solid substance, the passivation effect is very small, so there is basically no voltage hysteresis in the system, and the system itself is safer than other lithium primary batteries. Through in-depth research on lithium manganese dioxide batteries, under the same volume conditions, lithium manganese dioxide batteries provide more than 50% energy than lithium-sulfur dioxide batteries. Lithium manganese dioxide batteries are widely used in micro-power consumption electronic products such as cameras, water meters, instruments and meters, and cardiac pacemakers. my country has started the independent development and research of lithium manganese dioxide batteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M6/00H01M50/403H01M50/414
CPCH01M6/005H01M50/403
Inventor 曹元成黄高旭兰倩汤舜梁济元
Owner JIANGHAN UNIVERSITY
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