PP-based tab material and preparation method thereof

Abstract

The invention discloses a PP-based tab material, which comprises the following components in parts by weight: 80-120 parts of polypropylene (PP); 10-50 parts of conductive filler; 1-20 parts of thermal conductive filler; titanate coupling agent 1~5 parts; 1~5 parts of cellulose binder. The invention also discloses a preparation method of PP-based lug material, including the following steps: (1) batching; (2) pretreatment of conductive filler and thermal conductive filler; (3) melting PP at high temperature on an open mill, Add conductive fillers, thermal conductive fillers, titanate coupling agents, and cellulose binders for blending; (4) Peel the blended mixture from the mill and wait for it to cool to room temperature; (5) After cooling The mixture is pulverized, and the pulverized powder is ready for tableting. The tab material involved in the present invention has high electrical and thermal conductivity and is not easily corroded by electrolyte.

Description

technical field [0001] The invention relates to a tab of a lithium ion battery, in particular to a PP-based tab material and a preparation method thereof. Background technique [0002] At present, lithium-ion batteries have been widely used in various fields. Commonly used in daily life are portable phone batteries, notebook batteries, portable electric tool batteries, etc. In recent years, with the rapid development of model aircraft, electric tools and electric toys, lithium-ion The rate discharge performance requirements of batteries are getting higher and higher, but it is difficult for commercialized lithium-ion batteries to achieve continuous discharge above 20C rate. , making the battery prone to thermal runaway, resulting in poor battery rate discharge performance and cycle performance. In order to obtain a lithium-ion battery with good rate discharge performance and safety and reliability, during high-current discharge, on the one hand, it is necessary to avoid a l...

AI Technical Summary

Problems solved by technology

At present, the Chinese patent application publication number CN103178232A discloses a soft-pack power lithium-ion battery negative electrode tab structure and its preparation method. The tab substrate is a copper strip with a copper content of more than 99.99%. The ear material has excellent electrical conductivity, with a conductivity of about 584,000 s / cm. However, there are problems in the above-mentioned patents and the prior art that use metal as the ear material: during the high-rate discharge process of the battery, a large amount of heat is generated, and the metal Once the high-quality tab material contacts the electrolyte with high conductivity, an electrochemical reaction will occur, and the moisture in the air will further generate a large amount of gas when it enters the battery core, causing corrosion of the tab

Images