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Method for lithium pre-embedment of negative electrode of lithium ion capacitor

A capacitor and lithium-ion technology, applied in the field of lithium-ion capacitors, can solve the problems of complex methods and performance impact of lithium-ion capacitors

Active Publication Date: 2014-07-09
RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, it will have a great impact on the performance of lithium-ion capacitors
[0004] The traditional method of pre-intercalating lithium in the negative electrode of lithium-ion capacitors is more complicated

Method used

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  • Method for lithium pre-embedment of negative electrode of lithium ion capacitor
  • Method for lithium pre-embedment of negative electrode of lithium ion capacitor
  • Method for lithium pre-embedment of negative electrode of lithium ion capacitor

Examples

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Effect test

Embodiment 1

[0039] Activated carbon was used as the positive electrode, natural graphite was used as the negative electrode, a lithium sheet with a thickness of 0.1mm was used as the third electrode, and LiPF with a concentration of 1M 6 Dimethyl carbonate and propylene carbonate (volume ratio 1:1) were used as electrolytes to assemble lithium-ion capacitors. Under the condition of a temperature of 25°C, the lithium sheet and the negative electrode were directly short-circuited with a wire, and discharged for 30 hours to complete the lithium intercalation of the negative electrode. Then carry out cycle charge and discharge test on the lithium ion capacitor, the voltage range is 2V~4V.

Embodiment 2

[0041] The method of pre-intercalating lithium in the negative electrode of the lithium ion capacitor of Example 2 and Example 1 is basically the same, except that the thickness of the lithium sheet used as the third electrode is 0.2 mm.

Embodiment 3

[0043] The method of pre-intercalating lithium in the negative electrode of the lithium ion capacitor of Example 3 and Example 1 is basically the same, except that the thickness of the lithium sheet used as the third electrode is 0.3 mm.

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Abstract

The invention discloses a method for lithium pre-embedment of a negative electrode of a lithium ion capacitor. The method comprises the following steps that a lithium sheet, a first diaphragm, the negative electrode, a second diaphragm and a positive electrode are sequentially stacked and packaged in a shell and after an organic electrolyte with lithium salt is injected, the lithium ion capacitor is assembled; on the condition that the temperature ranges from -30 DEG C to 60 DEG C, the negative electrode is electrically connected with the lithium sheet, discharging is conducted for one hour to sixty hours, and lithium pre-embodiment of the negative electrode is achieved. According to the method for lithium pre-embedment of the negative electrode of the lithium ion capacitor, the negative electrode is electrically connected with the lithium sheet at the appropriate temperature, after discharging is conducted for one hour to sixty hours, the lithium sheet in the lithium ion capacitor can be slowly dissolved into the electrolyte to form lithium ions, so that the lithium ions are embedded in the negative electrode, lithium pre-embedment of the negative electrode is achieved, and the capacity of the obtained lithium ion capacitor is high. According to the method for lithium pre-embedment of the negative electrode of the lithium ion capacitor, it is only required that the electric connection mode of the negative electrode and the lithium sheet is controlled and the appropriate time and temperature are obtained, the lithium ion capacitor with the high capacity can be obtained, and the method has the advantages of being simple in operation process and the like.

Description

technical field [0001] The invention relates to the field of lithium ion capacitors, in particular to a method for pre-embedding lithium in the negative electrode of the lithium ion capacitor. Background technique [0002] As a new type of supercapacitor, lithium-ion capacitors combine the advantages of double-layer capacitors and lithium-ion batteries, that is, they have the advantages of high power output, high capacity, and high cycle life. They are expected to be used in new energy vehicles, electronic information, and instruments. Instrumentation, aerospace and other fields have been widely used. The working mechanism of lithium-ion capacitors is as follows: when charging, lithium ions in the organic electrolyte are intercalated into the negative electrode material to form a lithium intercalation compound, and anions in the electrolyte are adsorbed on the surface of the positive electrode to form an electric double layer; At the same time, the electric double layer gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86
CPCY02E60/13
Inventor 袁美蓉刘伟强徐永进
Owner RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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