Lithium-ion secondary battery and manufacturing method thereof

Abstract

The invention discloses a lithium-ion secondary battery and a manufacturing method thereof. The lithium-ion secondary battery comprises an anode material, a cathode material, a diaphragm and electrolyte, wherein, the anode material and the cathode material are coated in a metal casing, the diaphragm is arranged between the anode material and the cathode material, and the electrolyte is filled in the diaphragm; the anode material is prepared by mixing a Ni-Co-Mn ternary material with a lithium manganate material base on a proportion of 1-9:9-1 by weight parts; the cathode material is made of graphite; the electrolyte is prepared by mixing ethylene carbonate, dimethyl carbonate with methyl ethyl carbonate based on the volume ratio of 1:1:1; and the diaphragm is porous polypropylene, polyethylene or a modified polymer of the porous polypropylene and the polyethylene. The invention has the advantages of excellent safety performance, least production cost and larger specific capacity, and through safety tests such as overcharge, over-discharge, short circuit, needling, extrusion, heavy impact, hot box and the like, the safety performance meets the standard testing requirements of UL1642, IEC60949-3 and GB / T18287-2004, and products meet the requirements and reach RoHS instruction requirement.

Description

technical field [0001] The invention relates to a lithium-ion battery, in particular to a lithium-ion secondary battery with a new positive electrode formula with low material cost and excellent safety performance, and also relates to a manufacturing method of the battery. Background technique [0002] Lithium-ion batteries were developed and commercialized by Sony Corporation of Japan in the 1990s. Its appearance is a leap in the history of secondary battery development. Lithium-ion batteries have developed rapidly due to their light weight, high capacity, high working voltage, long service life and no pollution, and their global sales have exceeded the sum of nickel-metal hydride and nickel-cadmium batteries. In recent years, my country has made great progress in the industrialization of lithium-ion batteries. In 2003, the total output exceeded 250 million. In 2005, the production scale reached 600 million. It is catching up with and surpassing the world's advanced level. ...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a lithium-ion secondary battery, and the present invention also provides a manufacturing method of the battery, so as to solve the problems of high production cost of the existing lithium-ion battery and large limitations in the selection and use of battery materials, so that the lithium-ion battery With higher safety performance and longer service life

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