Preparation method of lithium titanate negative pole piece, lithium titanate negative pole piece and lithium ion battery containing negative pole piece

Abstract

The invention discloses a preparation method of a lithium titanate negative pole piece, the lithium titanate negative pole piece and a lithium ion battery containing the negative pole piece. The method comprises the following steps of mixing an EDOT monomer with a PSS solution, adjusting the pH value of the mixed solution to be acidic, and then putting the acidic solution in an ice water bath environment, and adding an ammonium persulfate solution to react; carrying out ion exchange and elution on the solution after the reaction; and carrying out rotary evaporation on the eluant to remove theredundant solvent to obtain a PEDOT: PSS solution, then adding a high-polarity organic solvent to dope to obtain a conductive polymer solution, and then adding the conductive polymer solution into a paste for preparing the lithium titanate negative pole piece and processing to obtain the lithium titanate negative pole piece, and then further preparing the lithium ion battery. The conductive performance of the lithium titanate negative pole piece is improved, and the lithium titanate negative pole piece is easy to coat and uniform in preparation, so that the discharge capacity and the cycling stability of the electrode material are improved as a whole, and the problem that the nano-scale powder electrode material is easy to agglomerate is solved.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a preparation method of a lithium titanate negative pole piece, a lithium titanate negative pole piece and a lithium ion battery containing the negative pole piece. Background technique [0002] Lithium-ion batteries have become an indispensable and important role in today's social life. Lithium-ion batteries are almost always found in small mobile phones, cameras, and notebooks, as large as buses, submarines, and spaceships. However, for the research of lithium-ion batteries, researchers have not slowed down their pace in recent years. Such unremitting pursuit has made lithium-ion batteries have higher and higher energy density, cycle performance, safety performance and lower cost. Cost of production. [0003] Among the anode materials for lithium-ion batteries, graphite-like carbon materials such as natural graphite, artificial graphite, and mesocarbon microspheres are the ma...

AI Technical Summary

Problems solved by technology

However, like other electrode active materials except graphite negative electrodes, lithium titanate materials also have obvious defects, that is, low electronic conductivity.

The low electronic conductivity of the pole piece material will cause large internal resistance of the battery, excessive internal consumption of electric energy, reduced discharge capacity, and is prone to polarization during high-rate charge and discharge, which restricts its use in lithium-ion batteries to a certain extent. application and development

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