Lithium ion battery pole piece and preparation method therefor, and lithium ion battery

Abstract

The invention discloses a lithium ion battery pole piece and a preparation method therefor, and a lithium ion battery. A layer of isolating binder with a relatively low melting point is coated on the surface of a positive electrode or a negative electrode; when a positive pole piece and a negative pole piece are in contact, the isolating binder coatings are in contact, and a positive electrode active coating and a negative electrode active coating are not in contact; therefore, the positive electrode active coating and the negative electrode active coating have less contact points in a condition of an internal short circuit, so that the positive electrode active coating and the negative electrode active coating are not burnt immediately; in addition, the separating binder coating is melted to be covered on the surfaces of the pole pieces in a temperature-rising process caused by the internal short circuit, so as to effectively prevent reaction; and in addition, the coating is the binder with the lower melting point, the binder is melted with the increase of the temperature in the condition of external short circuit, and the melted binder can be effectively covered on the surfaces of the pole pieces to prevent from short circuit caused by the contact between the positive electrode and the negative electrode due to the diaphragm rupture.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery pole piece, a preparation method thereof, and a lithium ion battery. Background technique [0002] With the increasingly prominent environmental problems, the country has invested more and more in the research and development of new energy vehicles and the construction of supporting infrastructure, especially the index requirements for energy saving and emission reduction, which has prompted the use of lithium-ion power batteries for electric vehicles in recent years. Development is very rapid. [0003] When electric vehicles use lithium-ion batteries, the primary consideration is safety and cycle issues. Lithium iron phosphate cathode material batteries are favored by most new energy vehicle manufacturers due to their excellent cycle performance and safety performance, and have always occupied the domestic market in the field of electric vehicle batteri...

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a lithium-ion battery pole piece and its preparation method and a lithium-ion battery, aiming at solving the problems of short circuit, extrusion, acupuncture and other safety problems of ternary batteries in the prior art. The problem of failing the test

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