A kind of preparation method of lithium ion battery pole piece

A lithium-ion battery, pole piece technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of affecting battery charge and discharge performance, increasing electrolyte concentration gradient, insufficient active material capacity, etc. Effects of discharge performance and low temperature performance, improved mass specific capacity, and increased porosity
CN102637848BActive Publication Date: 2016-04-13NINGDE AMPEREX TECH
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
NINGDE AMPEREX TECH
Publication Date
2016-04-13

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of a lithium ion battery pole piece. The method comprises the following steps of: coating paste containing active substances on a current collector and drying to obtain a pole piece to be treated; placing a buffer material layer on at least one surface of the pole piece to be treated; pressing the pole piece which has the buffer material layer and is to be treated through a compression roller; and separating the buffer material from the pole piece. Compared with the prior art, in the preparation method disclosed by the invention, pores on the surface of the pole piece can be effectivley protected as the surface of the pole piece is equipped with the buffer material layer in the compacting process, so that lithium ions can more smoothly pass in the pole piece. The lithium ion battery made from the pole piece prepared by the method is significantly improved in electrochemical performance, such as the mass specific capacity of the active substances and the low-temperature lithium branch crystallization precipitation; and as the pole piece becomes thicker, the battery made by the method is improved more significantly in performance and has a wide application prospect.
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Description

technical field

[0001] The invention belongs to the technical field of lithium ion batteries, and more specifically, the invention relates to a preparation method of lithium ion battery pole pieces with large surface porosity. Background technique

[0002] In recent years, major battery terminal manufacturers are competing to launch a variety of thin, flat-shaped electronic products, such as ipad, iphone, music phone and kindle. With the increasing experience requirements of consumer groups for electronic products, electronic terminal manufacturers have endowed electronic products with richer functions, and the display screens of products have become larger and larger. As a result, mobile power banks are required to be ultra-thin. At the same time keep the energy high. Judging from the current market, lithium-ion batteries are the most widely used rechargeable and dischargeable power sources for mobile electronic terminals. Many lithium-ion battery manufacturers are also c...

Claims

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