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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

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 improve the rate performance of the battery; however, the above-mentioned methods increase the risk of short circuit of the positive and negative electrodes and thermal runaway

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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Effect test

Embodiment 1

[0047] (1) Substrate preparation:

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

[0049] (2) Surface modification coating

[0050] Fix the substrate with a width of 400mm and a length of 1000m and a thickness of 16μm in the unwinding device and winding device of the winding continuous coating equipment, the size is 400*80*6 square Li 3 PO 4 The targets were respectively installed in physical vapor deposition device a and physical vapor deposition device b, the coating chamber was closed, and the vacuum was evacuated to 5×10 -2 Pa; Then, adjust the ventilation...

Embodiment 2

[0054] The same method as in Example 1 was used to prepare the separator substrate, the surface modification coating and the battery. 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 by a square PVC target with a size of 400*80*2, and then a layer of organic polymer layer is sputtered on the surface, the sputtering power is 1500W, and the line speed is 60m / h, and the diaphragm with a 400nm thick PVC layer deposited on the surface is obtained. , denoted as S2; the manufactured battery is denoted as A2.

Embodiment 3

[0056] The same method as in Example 1 was used to prepare the separator base material, the surface modification coating and the battery. The difference was that the target size used first was a square PTFE target with a size of 400*80*2, the sputtering power was 1500W, and the linear speed was 40m / h, to obtain a diaphragm 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 evacuated to 5×10 -2 Pa; then, adjust the vent valve to feed argon and oxygen, wherein the argon flow is 20sccm, the oxygen flow is 120sccm, the sputtering power is adjusted to 1000W, and the coating is performed at a linear speed of 80m / h to obtain a surface deposition of 500nm thick Li 2 SiO 3 The separator of the first layer is denoted as S3; the fabricated 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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