Lithium ion battery diaphragm, preparation method of the lithium ion battery diaphragm, and lithium ion battery containing the lithium ion battery diaphragm

A lithium ion battery and separator technology, applied in the field of lithium ion battery separator and its preparation, can solve the problems of increasing positive and negative short circuits and thermal runaway, and achieve the effects of reducing the risk of short circuit and high lithium ion conduction speed

Inactive Publication Date: 2013-06-05
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, increasing the porosity of the separator and reducing the thickness of the separator can improve the ion conduction between the positive and negative electrodes and

Method used

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  • Lithium ion battery diaphragm, preparation method of the lithium ion battery diaphragm, and lithium ion battery containing the lithium ion battery diaphragm
  • Lithium ion battery diaphragm, preparation method of the lithium ion battery diaphragm, and lithium ion battery containing the lithium ion battery diaphragm
  • Lithium ion battery diaphragm, preparation method of the lithium ion battery diaphragm, and lithium ion battery containing the lithium ion battery diaphragm

Examples

Experimental program
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Example Embodiment

[0046] Example 1

[0047] (1) Substrate preparation:

[0048] The high-density polyethylene (Mw=250000, Mw / Mn=12) is made into the original film through a twin-screw extruder, the temperature is 220℃, the stretching ratio is 5, the original film is preheated, the time is 2h, and the temperature is 120℃. Then, the film with a width of 400 mm was longitudinally stretched with a stretching ratio of 25, a stretching rate of 37 m / min, and a temperature of 120°C. That is, a separator substrate with a porosity of 60% and a thickness of 16 μm is obtained.

[0049] (2) Surface modification coating

[0050] The substrate with a width of 400mm and a length of 1000m and a thickness of 16μm is fixed in the unwinding device and the winding device of the continuous coil coating equipment. The size is 400*80*6 square Li 3 PO 4 The targets are installed in the physical vapor deposition device a and the physical vapor deposition device b respectively, the coating chamber is closed, and the vacuum is r...

Example Embodiment

[0053] Example 2

[0054] The diaphragm substrate, surface modification plating layer and battery were prepared by the same method as in Example 1. The difference is: the target is Li 2 S, Li 2 The thickness of the S coating is 100nm; then the Li 2 S is replaced with a square PVC target with a size of 400*80*2, and a layer of organic polymer is sputtered on the surface. The sputtering power is 1500W and the linear speed is 60m / h. The resulting membrane is a 400nm thick PVC layer deposited on the surface , Marked as S2; the produced battery is marked as A2.

Example Embodiment

[0055] Example 3

[0056] The diaphragm substrate, surface modification coating and battery were prepared by the same method as in Example 1. The difference is that the first used target is a PTFE target with a size of 400*80*2, the sputtering power is 1500W, and the linear velocity is 40m / h, get a membrane with a 2000nm thick PTFE layer deposited on the surface, and then replace the PTFE target with a square Li with a size of 400*80*6 2 SiO 3 The target is installed in the coating equipment, the coating chamber is closed, and the vacuum is reduced to 5×10 -2 Pa; Then, adjust the vent valve to pass in argon and oxygen, where the argon flow is 20sccm, the oxygen flow is 120sccm, the sputtering power is adjusted to 1000W, and the coating is carried out at a line speed of 80m / h to obtain a surface deposition of 500nm thick Li 2 SiO 3 The layer of the separator is denoted as S3; the produced battery is denoted as A3.

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Abstract

The invention provides a lithium ion battery diaphragm. The lithium ion battery diaphragm comprises a diaphragm base material and a solid electrolyte layer arranged on at least one surface of the diaphragm base material. The invention also provides a preparation method of the lithium ion battery diaphragm, a device adopted by the preparation method and a lithium ion battery containing the lithium ion battery diaphragm. A high rate of lithium ion transmission between positive and negative poles of the lithium ion battery containing the lithium ion battery diaphragm is kept, a risk of short circuit between the positive and negative poles is reduced, and a diaphragm heat shrinkage problem and battery safety are improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a lithium ion battery diaphragm, a preparation method thereof, and a lithium ion battery containing the diaphragm. Background technique [0002] In recent years, as a high specific energy power source, lithium-ion batteries have been widely used in portable electronic devices, electric tools, electric vehicles, energy storage power stations and other fields. With the increasingly widespread application of lithium-ion batteries, higher requirements are placed on the comprehensive performance of lithium-ion batteries. In particular, the electric vehicle market is showing a vigorous development momentum, which requires lithium-ion batteries with large charging and discharging current and high power. Many small electrical appliances also require high-rate discharge, and low-current discharge lithium-ion batteries can no longer fully meet the needs of the market. It is particularl...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 马永军李乐星马鲁飞郭姿珠
Owner BYD CO LTD
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