Method for pre-insertion of lithium of lithium ion supercapacitor negative electrode

A technology of supercapacitor and pre-intercalation of lithium, applied in the field of electrochemical energy storage, can solve the problem of large attenuation of ion concentration, and achieve the effects of simplifying assembly process, reducing cost and improving safety performance.

Inactive Publication Date: 2019-04-19
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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  • Method for pre-insertion of lithium of lithium ion supercapacitor negative electrode
  • Method for pre-insertion of lithium of lithium ion supercapacitor negative electrode
  • Method for pre-insertion of lithium of lithium ion supercapacitor negative electrode

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Effect test

Embodiment 1

[0026] Add 11% lithium nitride to the activated carbon positive electrode, use 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. Through the first round of charging, the negative electrode can be pre-intercalated with lithium at a depth of 80%. The voltage range of the capacitor is 2-4.2V, and the charge-discharge curve has good symmetry (see attached figure 2 shown), the Coulombic efficiency is close to 100%, and the specific energy reaches 31Wh / kg.

Embodiment 2

[0028] Add 6% lithium nitride to the active carbon positive electrode, use 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. Through the first cycle of charging, the negative electrode can be pre-intercalated with lithium at a depth of 60%. The voltage range of the capacitor is 2-4.2V, and the charge-discharge curve has good symmetry (see attached image 3 shown), the Coulombic efficiency is close to 100%, the specific energy reaches 25Wh / kg, and the discharge capacity at 30C discharge rate can be maintained at more than 80% of that at 1C discharge rate.

Embodiment 3

[0030] Add 15% lithium azide to the active carbon positive electrode, use 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. Through the first cycle of charging, the negative electrode is pre-intercalated with lithium at a depth of 85%. The voltage range of the capacitor is 2.8-4.2V. The charge-discharge curve is symmetrical, the Coulombic efficiency is close to 100%, and the specific energy reaches 17Wh / kg.

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Abstract

The invention introduces a method for pre-insertion of lithium of a lithium ion supercapacitor negative electrode. A positive electrode containing 2-15% of lithium-rich compound by mass content, a negative electrode capable of pre-insertion of lithium and a separator are assembled to be a lithium ion supercapacitor, the lithium ion supercapacitor is put into a container, electrolyte is injected into the container to charge the lithium ion supercapacitor to achieve pre-insertion of the lithium with 30-90% by the mass of the theoretical pre-insertion of lithium for the negative electrode of thepre-insertion of the lithium. The negative electrode is subjected to pre-insertion of the lithium to avoid the reduction of the concentration of the ions of the body in the electrolyte and the irreversible absorption of the negative ions at the positive electrode so as to achieve the purpose of improving the charge-discharge performances of the lithium ion supercapacitor.

Description

technical field [0001] The invention relates to a method for pre-embedding lithium in the negative electrode of a lithium ion supercapacitor, 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 supercapacit...

Claims

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Application Information

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