Lithium source active material, positive pole piece, lithium ion capacitor and preparation method thereof

Abstract

The invention discloses a lithium source active material, a positive pole piece, a lithium ion capacitor and a preparation method thereof, wherein the positive pole piece comprises a current collector, the lithium source active material, a capacitor material, a conductive agent and a binding agent, wherein the lithium source active material is preferably one or more of Li5FeO4, Li6CoO4, Li6MnO4, and Li5FexCo1-xO4; the capacitor material is one or more of graphene, activated carbon, porous carbon and other nano materials; and the weight percentages of the following raw materials as follows: 45-5% of lithium source active material, 85-60% of capacitor material, 8-1.0% of conductive agent and 4-1% of binding agent. The positive pole piece has the advantages of being safe, uniform in lithium intercalation, low in technological equipment requirement, high in operability and the like, and is suitable for batch production.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium source active material, a positive pole piece, a lithium ion capacitor and a preparation method thereof. Background technique [0002] With the continuous consumption of coal, oil and other non-renewable fuels and the resulting increasingly serious environmental problems, the development of new energy is the only way to achieve sustainable development of human survival. Lithium-ion batteries and supercapacitors, as chemical energy storage devices, are key points in the development of new energy technologies. [0003] Generally speaking, it is difficult to have both high energy density and high power density at the same time. For example, when lithium-ion batteries pursue high energy density performance, their power density will often decrease; although supercapacitors have high power density, but Its energy density is low. In order to have both high ener...

AI Technical Summary

Problems solved by technology

Lithium metal has high activity and is easy to chemically react with oxygen, carbon dioxide, and water in the air. Therefore, the use of lithium metal in the production process requires higher equipment support, which greatly increases production costs and is inconvenient to operate.

Both patent CN201610072072.6 and patent CN201210332874.8 disclose a lithium ion capacitor, they all use metal lithium as the metal lithium foil as the auxiliary electrode (third electrode), and perform lithium intercalation on the negative electrode by electrochemical methods to form lithium intercalation Negative electrode materials, although lithium-intercalation negative-electrode materials can be realized, due to the activity of metal lithium, the actual operation is difficult, and the lithium intercalation of the auxiliary electrode in the negative electrode is not uniform, especially for larger lithium-ion capacitors. It is even more difficult to achieve mass production