Nickel lithium manganate-based positive electrode material of lithium ion battery and preparation method thereof

Abstract

The invention discloses a nickel lithium manganate-based positive electrode material of a lithium ion battery and a preparation method thereof. A material used for a positive plate comprises a positive electrode current collector and a positive electrode slurry coating which is composed of a positive electrode active substance, a binder, a conductive agent and a solvent, wherein the positive electrode active substance is an Al2O3 coating of nickel lithium manganate, the binder is one or more selected from the group consisting of polyvinylidene fluoride and polytetrafluoroethylene, the conductive agent is one or more selected from the group consisting of conductive carbon black, conductive graphite and a carbon nanotube, the solvent is N-methylpyrrolidone, and the positive electrode current collector employs an aluminum foil. The lithium ion battery designed in the invention has reduced cost, and the purposes of improving reversible specific capacity, energy density, rapid charging and discharging capability, cycle performance and safety performance are achieved.

Description

technical field [0001] The invention relates to a lithium battery, in particular to a lithium ion battery cathode material based on lithium nickel manganese oxide and a preparation method thereof. Background technique [0002] With the rapid development of economy and society and the continuous progress of science and technology, the problems of energy shortage and deterioration of ecological environment have become the strategic cores affecting the sustainable development of human society. This has prompted people to look for clean and renewable new energy. As the "carrier" of portable energy in today's society, lithium-ion batteries are widely used in energy storage, communication, and national defense construction, especially in the promotion of new energy vehicles, which have risen to the height of national strategy. At present, the positive electrode materials of commercial lithium-ion batteries are mainly LiCoO2, LiFePO4, LiCoNiMnO2, LiMn2O4, and the negative electrod...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the production cost of lithium ion battery is high, the reversible specific capacity of the battery is low, the energy density and fast charging and discharging ability are not enough, and the cycle performance and safety performance are not enough. The purpose is to provide a lithium ion battery based on lithium nickel manganate The battery positive electrode material and its preparation method solve the problems of improving the reversible specific capacity, energy density and rapid charge and discharge capacity of the battery while reducing the production cost, and improving the cycle performance and safety performance

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