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Lithium ion battery, isolation membrane utilized by same and preparation method of isolation membrane

A lithium-ion battery and separator technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problem of reducing battery energy density, deterioration of lithium-ion battery rate performance, and reducing the adhesion of separators to positive and negative electrodes. performance and other issues, to achieve the effects of improving rate performance and cycle performance, improving high-temperature internal short-circuit performance, and excellent thermal shrinkage resistance.

Inactive Publication Date: 2014-06-11
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of ceramic layers will affect various performances of lithium-ion batteries, for example, it will reduce the energy density of the battery, reduce the migration rate of lithium ions during charging and discharging, resulting in poor battery rate performance, and reduce the cycle life of the battery. It will also reduce the bonding performance between the separator and the positive and negative electrodes, resulting in poor control of battery deformation caused by cycling
In addition, since the ceramic coating is only physically attached to the separator, the adhesion between the ceramic coating and the separator is very small at high temperatures, so when the lithium-ion battery is overheated, squeezed and other irregular conditions When in use, a large amount of heat energy generated by its positive and negative electrodes will still cause a large thermal shrinkage of the ceramic separator, which will cause a short circuit between the positive and negative electrodes of the battery and cause a safety accident

Method used

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  • Lithium ion battery, isolation membrane utilized by same and preparation method of isolation membrane
  • Lithium ion battery, isolation membrane utilized by same and preparation method of isolation membrane
  • Lithium ion battery, isolation membrane utilized by same and preparation method of isolation membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0038]Preparation of isolation film: use bisphenol A cyanate and 1-heptene; according to requirements, bisphenol A cyanate must be purified first, and washed with acetone for many times, mainly to remove bisphenol A cyanate The remaining small molecular substances in the liquid, and then use vacuum distillation to obtain bisphenol A cyanate with a purity of 99.9%. Before using bisphenol A cyanate, it must be vacuumed at 60°C / 6h; For 1-heptene, it can be purified by passing through a column; then, bisphenol A cyanate and 1-heptene are dissolved in a carbon tetrachloride solvent at a molar ratio of 1:9, and stirred until they are evenly mixed , and carry out pre-polymerization with stirring (speed 800r / min) at 70-80°C, then remove carbon tetrachloride by vacuuming, and adopt stage temperature control (110°C / 3h--130°C / 2h--150°C / 2h--180℃ / 1h) to make the two complete block copolymerization; the mixture in this process is a high-viscosity melt, and the viscosity of the block copoly...

Embodiment 2

[0042] Preparation of isolation film: use bisphenol A cyanate and 1-heptene; according to requirements, bisphenol A cyanate must be purified first, and washed with acetone for many times, mainly to remove bisphenol A cyanate The remaining small molecular substances in the liquid, and then use vacuum distillation to obtain bisphenol A cyanate with a purity of 99.9%. Before using bisphenol A cyanate, it must be vacuumed at 60°C / 6h; For 1-heptene, it can be purified by passing through a column; then, bisphenol A cyanate and 1-heptene are dissolved in a carbon tetrachloride solvent at a molar ratio of 1.5:8.5, and stirred until they are evenly mixed , and carry out pre-polymerization with stirring (speed 800r / min) at 70-80°C, then remove carbon tetrachloride by vacuuming, and adopt stage temperature control (110°C / 3h--130°C / 2h--150°C / 2h--180℃ / 1h) to make the two complete block copolymerization; the mixture in this process is a high-viscosity melt, and the viscosity of the block c...

Embodiment 3

[0045] Preparation of isolation film: use bisphenol A cyanate and 1-heptene; according to requirements, bisphenol A cyanate must be purified first, and washed with acetone for many times, mainly to remove bisphenol A cyanate The remaining small molecular substances in the liquid, and then use vacuum distillation to obtain bisphenol A cyanate with a purity of 99.9%. Before using bisphenol A cyanate, it must be vacuumed at 60°C / 6h; For 1-heptene, it can be purified in the form of a column; then, bisphenol A cyanate and 1-heptene are dissolved in a carbon tetrachloride solvent in a molar ratio of 2:8, and stirred until they are evenly mixed , and carry out pre-polymerization with stirring (speed 840r / min) at 70-80°C, and then remove carbon tetrachloride by vacuuming, and adopt stage temperature control (105°C / 2h--125°C / 2h--145°C / 2h--170℃ / 2h) to make the two complete block copolymerization; the mixture in this process is a high-viscosity melt, and the viscosity of the block copol...

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Abstract

The invention discloses a lithium ion battery, an isolation membrane of the lithium ion battery and a preparation method of the isolation membrane. The isolation membrane comprises embedded copolymer resin which is formed by copolymerizing a monomer A and a monomer B, wherein the monomer A is selected from cyanate ester and derivatives of cyanate ester, and the monomer B is selected from olefin and derivatives of olefin; the thermal shrinkage of the embedded copolymer resin is smaller than 3 percent at the condition of 130DEG C / 3h. Compared with the prior art, the isolation membrane of the lithium ion battery is excellent in thermal shrinkage performance, so that the short circuit of the lithium ion battery at the high temperature can be effectively improved, and the rate performance and the cycling performance of the battery also can be improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, more specifically, the invention relates to a lithium ion battery separator with excellent performance and a preparation method thereof. Background technique [0002] When lithium-ion batteries are abused (such as overcharging, overheating, puncture, etc.), the temperature rise will usually reach more than 90°C; but once the temperature of the battery exceeds 90°C, the traditional PE and PP separators in the battery cells will have Larger shrinkage and more heat are generated due to the short circuit of the positive and negative electrodes, making the battery prone to fire or even explosion. [0003] In view of the above situation, at present, a layer of ceramic layer is generally coated on the separator to reduce the thermal shrinkage of the separator, so as to prevent the positive and negative short circuit of the battery. However, the introduction of ceramic layers will affect various per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525H01M50/403H01M50/414
CPCY02E60/122H01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 牛磊赖旭伦江辉杨建瑞陈辉
Owner DONGGUAN AMPEREX TECH
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