A negative electrode active material for a lithium ion battery, a preparing method thereof, a negative electrode plate of the lithium ion battery and the lithium ion battery

Abstract

A negative electrode active material for a lithium ion battery is provided. The active material includes a composite formed by connecting a carbon material and black phosphorus through C-P bonds. The carbon material and the black phosphorus in the active material form the C-P bonds, thus ensuring tight contact between the carbon material and the black phosphorus in charge-discharge processes, and avoiding bad contact with the carbon material and a current collector when the black phosphorus is expanded. In addition, the carbon material is high in flexibility so that expansion of the black phosphorus can be relieved in the aspect of volume. The invention also provides a preparing method of the active material. The method includes mixing the carbon material and the black phosphorus, and then subjecting the mixture to ball milling at a ball milling speed of 300-700 r / min for 10-20 h, wherein the carbon material and the black phosphorus are connected through the C-P bonds to form the composite, and then the active material is formed. The method is simple and easy to operate. The invention also provides a negative electrode plate of the lithium ion battery and the lithium ion battery. The lithium ion battery has extremely high energy density and long cyclic lifetime.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a lithium ion battery negative electrode active material and a preparation method thereof, a lithium ion battery negative electrode sheet and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, high operating voltage, no memory effect, and wide operating temperature range, and have been widely used in communications, electric vehicles, aerospace and other fields. In recent years, with the rapid development of portable electronic devices and electric vehicles, people have put forward higher requirements for the energy density, power density, and cycle life of lithium-ion batteries. [0003] Anode materials play an important role in improving the performance of lithium-ion batteries. At present, almost all commercial lithium-ion battery anode materials are graphite, which has the advantages of small...

AI Technical Summary

Problems solved by technology

However, when black phosphorus is used in lithium-ion batteries, due to the large volume expansion (about 300%) when it intercalates lithium, it is easy to cause poor contact between the active material, the conductive agent, and the current collector, and the battery capacity rapidly decays.

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