Lithium ion battery and membrane thereof

A technology for lithium-ion batteries and diaphragms, which is applied in secondary batteries, battery pack components, circuits, etc., and can solve problems such as misalignment between diaphragms and electrodes, failure to form adhesion, and short-circuiting of batteries
CN102569701AInactive Publication Date: 2012-07-11NINGDE AMPEREX TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NINGDE AMPEREX TECH
Publication Date
2012-07-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the technical field of lithium ion batteries and particularly relates to a membrane for a lithium ion battery, which is good in safety performance and mechanical performance. The membrane for the lithium ion battery comprises a porous membrane substrate, a ceramic material layer coated on the surface of the porous membrane substrate, and a polymer sticking layer which is coated on the ceramic material layer and is located on the surface layer. Compared with the prior art, the ceramic material layer can form a microcosmic physical separation on the surface of the membrane so as to reduce the piercing effect of a lithium pine-tree crystal on the membrane; the ceramic material layer coated on the porous membrane substrate can improve the heat resistance of the membrane; the polymer sticking layer which is coated on the ceramic material layer and has a sticking effect can be used for preventing an inner short circuit caused by staggering of the membrane and an electrode, so that the safety performance of the battery is enhanced. In addition, the membrane, an anode sheet and a cathode sheet are joined together through the effect of the polymer sticking layer, so that the mechanical performance of the battery can be enhanced. Furthermore, the invention further discloses the lithium ion battery containing the membrane.
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Description

technical field

[0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a diaphragm for lithium ion batteries with good safety performance and mechanical properties and a lithium ion battery comprising the diaphragm. Background technique

[0002] Lithium-ion batteries, as a clean new energy source, have been applied in more and more fields, such as mobile phones, notebook computers, electric bicycles and power vehicles. Because these products using lithium-ion batteries as power sources are closely related to people's lives, people's requirements for their safety are getting higher and higher.

[0003] Lithium-ion batteries generally include a packaging case and a battery cell contained in the packaging case. The battery cell generally includes a positive electrode, a negative electrode, an electrolyte, and a separator spaced between the positive electrode and the negative electrode. Among them, the separator is a very impo...

Claims

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