Lithium ion supercapacitor negative electrode lithium pre-embedding method

A technology for supercapacitors and pre-embedded lithium, which is applied in the direction of hybrid capacitor electrodes, capacitors, electrolytic capacitors, etc., can solve the problems of large ion concentration attenuation, achieve the effects of simplifying the assembly process, reducing costs, and improving cycle stability

Inactive Publication Date: 2020-05-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a lithium-ion supercapacitor negative electrode pre-embedded lithium method, the purpose of which is to solve the problem of large attenuation of ion concentration in the electrolyte of lithium-ion supercapacitors, while further improving the lithium-ion supercapacitor Charge and discharge characteristics, such as efficiency, capacity, high current charge and discharge characteristics and cycle stability, etc.

Method used

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  • Lithium ion supercapacitor negative electrode lithium pre-embedding method
  • Lithium ion supercapacitor negative electrode lithium pre-embedding method

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Adding 22% Li by mass to the activated carbon positive electrode 2 C 2 , with lithium sheet as the negative electrode, 1M LiPF6 / EC:DEC (volume ratio 1:1) as the electrolyte, and cellgard2400 as the diaphragm to assemble the half-cell. The battery is charged for the first time at a rate of 0.05C, and the cut-off voltage of charging reaches 4.2V. The depth of lithium embedded in the negative electrode is 62%, and the specific capacity of the positive electrode after the first cycle of activation is tested.

Embodiment 2

[0034] Adding 10% Li by mass to the activated carbon positive electrode 2 C 2 , with hard carbon as the negative electrode, 1M LiPF6 / EC:DEC (volume ratio 1:1) as the electrolyte, and cellgard2400 as the diaphragm to assemble the lithium-ion supercapacitor. Charge the battery for the first time at a rate of 0.05C, charge the cut-off voltage to 4.2V, and achieve a 50% depth of pre-intercalated lithium on the negative electrode.

Embodiment 3

[0036] Adding 30% Li by mass to the activated carbon positive electrode 2 C 2 , with hard carbon as the negative electrode, 1M LiPF6 / EC:DEC (volume ratio 1:1) as the electrolyte, and cellgard2400 as the diaphragm to assemble the lithium-ion supercapacitor. Charge the battery for the first time at a rate of 0.05C, charge the cut-off voltage to 4.2V, and achieve a depth of 85% of pre-intercalated lithium on the negative electrode.

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Abstract

The invention discloses a novel negative electrode lithium pre-embedding method. In the process of preparing a porous carbon or conductive polymer and a composite positive electrode thereof, a lithium-carbon binary compound is added, wherein the lithium-carbon binary compound accounts for 10-30% of the mass of the positive electrode, after the electrode is prepared, the electrode can be assembledwith lithium-embeddable metallic oxide or carbon lithium-embedded negative electrode to form a lithium ion supercapacitor; the lithium carbide in the positive electrode is decomposed through a first-circle charging process to enable the metal lithium to enter the negative electrode, so that 50-85% of lithium pre-embedding treatment is performed on the negative electrode; and after a high-content lithium-source lithium-carbon compound is added into the positive electrode and is subjected to first-circle formation, the performance of the capacity of the positive electrode is influenced. The negative electrode is pre-embedded with lithium, so that the reduction of the concentration of body ions in the electrolyte and the irreversible adsorption of negative ions on the positive electrode in the charging and discharging process can be prevented to a certain extent, and the purpose of improving the charging and discharging performance of the lithium ion supercapacitor is achieved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion supercapacitors, and belongs to the technical field of electrochemical energy storage. Background technique [0002] In recent years, an electrochemical hybrid supercapacitor composed of an electric double layer capacitor electrode and a secondary battery electrode has become a research and development hotspot. The positive electrode of the hybrid supercapacitor uses a carbon material based on the formation of an electric double layer based on interface charge adsorption and desorption. , the negative electrode uses metal oxides or carbonaceous materials that can intercalate lithium for energy storage based on lithium ion intercalation / extraction. Because the energy storage mechanism of the negative electrode is the same as that of the lithium-ion battery system, it is also called: lithium-ion supercapacitor. Generally, in the lithium-ion supercapacitor system, for the lithium-intercalation n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/84H01G11/50H01G11/06
CPCH01G11/06H01G11/50H01G11/84H01G11/86Y02E60/13
Inventor 刘翠连张洪章李先锋张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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