Pre-embedding method of lithium ion super capacitor cathode

Abstract

The invention discloses an easily implemented lithium pre-insertion novel method for a cathode of a lithium ion super capacitor, wherein, a nonmetal lithium third electrode is led into a novel lithium ion super capacitor system which takes porous charcoal materials, conductive polymers or compounds of the conductive polymers as an anode, lithium insertable metal oxides or charcoal lithium insertion materials as the cathode and organic lithium salt solution as electrolyte, and lithium pre-insertion processing of the cathode with a depth of 5 to 60 percent is performed so as to prevent reduction of the ion concentration of the electrolyte during the charging and discharging process and non-reversible absorption of anions on the anode and improve the charging and discharging characteristics of the capacitor. The essential component of the nonmetal lithium third electrode is lithium-rich compounds with non-reversible lithium-free property; during the preparation process of the porous charcoal material anode or the conductive polymer anode, the lithium-rich compounds of the third electrode are mixed by mass percent of 3 to 50 and can form the lithium ion super capacitor together with the lithium insertable cathode after being prepared into the electrode; during the activation process of the capacitor, lithium pre-insertion of the cathode is realized.

Description

technical field [0001] The invention relates to a new method for pre-embedding lithium in the negative electrode of a lithium ion supercapacitor, and belongs to the technical field of green energy. Background technique [0002] In recent years, a new type of electrochemical hybrid supercapacitor composed of polarized electrodes for electric double layer capacitors and non-polarized electrodes for secondary batteries has gradually become a research hotspot. Activated carbon / NiOOH alkaline hybrid supercapacitors have taken the lead in realizing industrial development. Compared with basic carbon / carbon electric double layer capacitors, its specific energy advantage is obvious. In order to pursue higher specific energy and specific power characteristics, a non-aqueous system electrochemical hybrid supercapacitor that uses porous carbon materials (or conductive polymers or their composites) as the positive electrode and lithium ion intercalation / extraction materials as the negati...

AI Technical Summary

Problems solved by technology

However, there are many disadvantages in this method: the introduction of metal lithium as one electrode into the capacitor system is likely to cause safety problems, the manufacturing process of the electrode group becomes very complicated, and the assembly environment is demanding; the external short circuit process is not easy to control, and if it is not properly controlled, it will easily lead to electrode failure; The capacitor system needs to increase nearly double the electrolyte and diaphragm for the pre-intercalation lithium process, etc.

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