A positive electrode slurry, a positive electrode sheet, and a method for preparing the positive electrode sheet

Abstract

The invention discloses positive electrode slurry; the positive electrode slurry is prepared from a first positive electrode material, a second positive electrode material, a conductive agent and a binder according to the following mass percentages: 50-80% of the first positive electrode material, 10-40% of the second positive electrode material, 2-5% of the conductive agent and 5-8% of the binder, wherein the first positive electrode material is one kind of carbon nano tubes, graphene, activated carbon, and nano-gate carbon; the second positive electrode material is one kind of Li<2>NiO<2>, Li<2>MoO<3>, Li<6>CoO<4>, Li<2>CuO<2>, Li<6>ZnO<4>, Li<5>AlO<4>, Li<8>ZrO<4>, Li<5>ReO<6> and Li<5>FeO<4>; and the binder is dissolved into a solvent to form a glue solution with the mass concentrationof 1-10%. The positive electrode slurry is coated on a porous current collector to be dried to obtain a positive electrode plate. A negative electrode is subjected to pre-lithium-intercalation by theobtained second positive electrode material on the positive electrode plate, and meanwhile, the structure is simple, and the operation is convenient.

Description

technical field [0001] The invention relates to a slurry coated on an electrode sheet, because there is a slurry used for a positive electrode of a lithium ion capacitor, an electrode sheet using the slurry, and a preparation method of the electrode sheet. Background technique [0002] Lithium-ion capacitors are energy storage devices that combine lithium-ion batteries and supercapacitors. Compared with supercapacitors, lithium-ion capacitors have higher energy density. Compared with lithium-ion batteries, lithium-ion capacitors have better low-temperature performance and better rate performance. A very important technology in the production process of lithium-ion capacitors is the pre-intercalation lithium technology of negative electrode materials. There are two main types of existing pre-intercalation lithium technologies: one is to use inert lithium powder (FMC, SLMP) or lithium metal Lithium supplementation, how to add inert lithium powder, the choice of solvent, and h...

AI Technical Summary

Problems solved by technology

Lithium metal supplementation is a lithium supplementation method that has high requirements on the environment, and lithium metal residues may pose a great safety hazard. At the same time, during the production process, the pre-intercalation of lithium takes a long time, which is unfavorable to mass production.

The second is to use a high-concentration electrolyte for lithium supplementation, and apply intermittent current pulses to charge the capacitor. The lithium ions in the electrolyte are inserted into the negative electrode to complete the pre-intercalation of lithium. However, this method will consume lithium ions in the electrolyte and weaken the capacitor. power characteristics

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