Inorganic/organic composite membrane, preparation method of inorganic/organic composite membrane and lithium ion secondary battery containing membrane

An inorganic composite and separator technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of small compactness, small surface roughness, insufficient bulk density of the separator, poor heat resistance of the separator, etc., to improve safety and stability. , The effect of preventing fire accidents and reducing the resistance of transmission

CN104064707AActive Publication Date: 2014-09-24东莞市魔方新能源科技有限公司

7 Cites 47 Cited by

Patent Information

Authority / Receiving Office: CN · China
Current Assignee / Owner: 东莞市魔方新能源科技有限公司
Publication Date: 2014-09-24

Smart Images

Figure 1
Figure 2
Figure 3

Patent Text Reader

Abstract

The invention discloses an inorganic / organic composite membrane which comprises a porous substrate and a porous insulating layer, wherein the porous insulating layer is attached to the porous substrate, and at least one surface of the porous substrate is coated with the porous insulating layer; the porous insulating layer comprises inorganic particles and a binding agent, wherein the inorganic particles are composed of n particles with different average particle diameters, n is large than or equal to 2, and the average particle diameters from the first type of inorganic particles to the nth type of inorganic particles are changed in a gradient manner. The invention further discloses a preparation method of the inorganic / organic composite membrane. The preparation method comprises the following steps: firstly, dissolving the binding agent into a solvent to form a polymer solution, then adding the inorganic particles, mixing to prepare the porous insulating layer, and then coating at least one surface of the porous substrate with the porous insulating layer. The invention further discloses a lithium ion secondary battery containing the membrane. The inorganic / organic composite membrane disclosed by the invention has the advantages of high stacking density, low thermal shrinkage rate, high puncture strength, simple preparation process and proper cost, and the lithium ion secondary battery containing the membrane has the advantages of good conservation rate of circulating volume and excellent safety performance and electrochemical performance.

Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the technical field of lithium-ion secondary batteries, in particular to an inorganic / organic composite membrane, a preparation method thereof and a lithium-ion secondary battery containing the membrane. Background technique

[0002] Due to the characteristics of high energy density, high working voltage and light weight, lithium-ion secondary batteries have been widely used in consumer electronics products, such as mobile phones, notebook computers, tablet computers, Bluetooth headsets, MP3 and digital cameras. With the increasingly severe environmental pollution and energy crisis, the use of lithium-ion secondary batteries in power batteries and stationary power stations has become more and more popular, but the safety of lithium-ion secondary batteries has always been the focus of attention.

[0003] The diaphragm of the lithium-ion secondary battery is used as the isolation of the positive and negative electrodes. It must...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Login to View More