Lithium ion battery negative electrode material and preparation method thereof as well as lithium ion battery negative electrode plate and lithium ion battery

Abstract

The embodiment of the invention provides a lithium ion battery negative electrode material. The lithium ion battery negative electrode material comprises a negative electrode active material, a conductive agent, a bonding agent and an organic solvent, wherein the negative electrode active material comprises lithium titanate Li4Ti5O12 and transition metal sulfide; the lithium titanate Li4Ti5O12 accounts for 50%-95% of the total mass of the negative electrode active material; the transition metal sulfide is one or more of NiS, FeS2, FeS, TiS2, MoS and Co9S8; the negative electrode active material, the conductive agent and the bonding agent account for 70%-90%, 5%-20% ad 5%-10% of the total mass of the negative electrode active material, the conductive agent and the bonding agent respectively; the organic solvent accounts for 30%-70% of the total mass of the lithium ion battery negative electrode material. The lithium ion battery negative electrode material is high in capacity and has good cycling stability and durability. The embodiment of the invention further provides a preparation method of the lithium ion battery negative electrode material, a negative electrode plate containing the lithium ion battery negative electrode material and a lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery negative electrode material and a preparation method thereof, a lithium ion battery negative electrode sheet and a lithium ion battery. Background technique [0002] Since the 1990s, among many alternative energy products, lithium-ion batteries have attracted people's close attention due to their high energy density, good cycle performance, and no memory effect. With the low-carbon economy in the ascendant, lithium-ion batteries are actively developing in the direction of power vehicles and grid energy storage. Therefore, the development of lithium-ion batteries with high energy density and long cycle life has become the focus of industry research. [0003] At present, most commercial lithium-ion batteries use carbon-based materials as negative electrode active materials, but carbon-based negative electrode materials have many defects. Failure risks and...

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Problems solved by technology

[0006] In view of this, the first aspect of the embodiment of the present invention provides a lithium ion battery negative electrode material to solve the problem of lithium titanate Li 4 Ti 5 o 12 The specific capacity of the negative electrode material is low, and the lithium-ion battery made of it has low energy density and high cost.

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