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Isolating membrane, preparation method of isolating membrane, and electrochemical device comprising isolating membrane

A technology of isolation film and oxide, which is applied in the field of energy storage, can solve problems such as surface cracking and aging of ceramic layers, easy safety problems, and difficulty in nanoscale, so as to improve interface wettability, avoid mechanical strength reduction, and improve Effect of Heat Shrinkage Resistance

Active Publication Date: 2019-07-09
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in this composite separator, which needs further development and research
[0003] The above problems can be effectively improved by modifying the surface of polymer substrates by mixing inorganic particles and binders to form organic / inorganic composite coatings. However, due to process limitations and technical effect requirements, the coating thickness is difficult to achieve nanoscale. In addition, the bonding between the inorganic particles and the polymer substrate is mainly by the binder, and the bonding force of different regions is significantly affected by the distribution of the binder, and it is easy to cause ceramic layer damage during the coating process, long-term cycle or battery abuse. Surface cracks and aging, changes in porosity, shedding of ceramic particles, etc., resulting in poor ion-conducting performance, and even easy to cause safety problems in severe cases

Method used

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  • Isolating membrane, preparation method of isolating membrane, and electrochemical device comprising isolating membrane
  • Isolating membrane, preparation method of isolating membrane, and electrochemical device comprising isolating membrane
  • Isolating membrane, preparation method of isolating membrane, and electrochemical device comprising isolating membrane

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preparation example Construction

[0031] According to the preparation method of the isolation film of the second aspect of the embodiment of the present application, it at least includes the following steps:

[0032] providing the substrate, the substrate being a porous substrate; and

[0033] A layer of the inorganic layer is formed on the surface of the substrate and in the pores by a vapor deposition method to obtain the isolation film, wherein the thickness of the inorganic layer is 20 nm to 2000 nm, and the mass M1 of the inorganic layer is equal to that of the substrate. The ratio M1 / M2 of the mass M2 satisfies 0.05≤M1 / M2≤7.5, and the interfacial peel force between the inorganic layer and the substrate is not less than 30N / m.

[0034] The inorganic layer formed by vapor deposition method can not only be deposited on the surface of the substrate, but also can be further deposited on the inner wall of the hole of the substrate. With the increase of the coating rate of the inorganic layer on the substrate, ...

Embodiment

[0054] The lithium-ion secondary battery is prepared by the above method. Specifically, the plasma-assisted thermal evaporation deposition technology is used to prepare an inorganic layer with certain parameters on the upper and lower surfaces of the porous substrate by vapor deposition.

[0055] The specific process parameters are: the target is metal aluminum (it can also be doped with other elements, such as Si), and the vacuum degree of the deposition chamber is less than 1×10 -3 Pa, the heating current is 190A, the oxygen flow rate is 300sccm, the plasma power is about 300W to activate the reaction gas, and the process time is 5min.

[0056] The specific parameters of the prepared separator are shown in Table 1.

[0057] Table 1

[0058]

[0059]

[0060] Among them, "—" indicates that the layer structure is not set.

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Abstract

The invention relates to the field of energy storage materials, in particular to an isolating membrane, a preparation method of the isolating membrane and an electrochemical device comprising the isolating membrane. The isolating membrane comprises a base material and an inorganic layer at least arranged on one side of the base material, wherein the base material is a porous base material, and theinorganic layer is a dielectric layer which does not contain an adhesive; the thickness of the inorganic layer is 20-2000 nm; the ratio of the mass M1 of the inorganic layer to the mass M2 of the base material is M1 / M2, wherein M1 / M2 is greater than or equal to 0.05 and less than or equal to 7.5; and the interface stripping force of the inorganic layer and the base material is not lower than 30N / m. According to the isolating membrane disclosed by the invention, the ultrathin inorganic layer without the adhesive is arranged on the surface of the porous base material, so that the interface wettability and the thermal shrinkage resistance of the isolating membrane are effectively improved, certain mechanical strength is guaranteed, and the problem that the mechanical strength is lowered andthe base material is blocked caused by falling can be avoided, and the safety and the cycle life of the battery are improved and prolonged. By controlling the ranges of the M1 / M2 and the interface stripping force, the energy density is relatively high.

Description

technical field [0001] The present application relates to the field of energy storage, in particular, to an isolation membrane, a preparation method thereof, and an electrochemical device including the isolation membrane. Background technique [0002] In the internal structure of the battery, the separator is a key component, usually a porous polymer film, which has the characteristics of electronic isolation and ion conduction, and is used to ensure the normal transmission of ions between the positive electrode and the negative electrode without short circuit. In recent years, in order to improve the problems of high thermal shrinkage and poor wettability with electrolyte of a single polymer separator, a composite separator coated with a ceramic coating on the surface of a polymer substrate has gradually become a key technology for improving battery safety performance. . However, there are still some problems in this composite separator, which needs further development and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/417H01M50/42H01M50/423H01M50/426H01M50/431H01M50/451H01M50/491H01M50/494
CPCH01M10/0525H01M50/431H01M50/403H01M50/451H01M50/491H01M50/426H01M50/42H01M50/423H01M50/417H01M50/494Y02E60/10H01M50/4295H01M50/44C23C14/0021C23C14/028C23C14/081C23C14/28
Inventor 黄华锋黄起森王铈汶梁成都
Owner CONTEMPORARY AMPEREX TECH CO
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