Positive paste, preparation method, anode piece and lithium ion battery

Abstract

A positive paste comprises a positive active material and a PEDOT-doped gel material. The PEDOT-doped gel material is a gel polymer compound obtained through polymerization by a solution system I under a heating state, and PEDOT powder in an oxidized state is uniformly distributed on the gel polymer compound; a polymerized monomer is acrylic acid capable of ring opening polymerization and derivatives thereof; the positive active material comprises a first positive active material and a second positive active material; the first positive active material is a ternary material NixCoyMnzO2, and x+y+z=1; the second positive active material is one or several selected from lithium cobalt oxide, lithium manganate, lithium iron phosphate, lithium nickel manganate, lithium iron manganese phosphate and lithium ferrite; and the weight ratio of the first positive active material to the second positive active material is 1-3 to 3-1. The positive paste of a lithium ion battery has good chemical stability, high safety performance and long cycle life.

Description

Technical field [0001] The invention relates to a lithium ion battery, in particular to a positive electrode slurry of a lithium ion battery and a preparation method thereof, and a positive electrode sheet and a lithium ion battery made from the positive electrode slurry Background technique [0002] The environmental problems caused by traditional internal combustion engine vehicles and the shortage of oil resources force people to turn their vision to new energy vehicles. Electric vehicles have become an important development direction for new energy vehicles because they can truly achieve "zero emissions". In the past few decades, the increasingly mature lithium-ion battery technology has become the main driving force for the rapid development of electric vehicle technology. As the lithium ion battery as the core part of the lithium ion battery, the positive electrode material is directly related to the quality of the battery. Commercial LiCoO 2 Facing severe challenges such...

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Problems solved by technology

[0004] Compared with traditional materials, although ternary materials have greatly improved the energy density of batteries, they also have disadvantages such as chemical stability and insufficient cycle life.

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