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A method for pre-intercalating lithium in the negative electrode of a lithium ion supercapacitor

A supercapacitor and pre-embedded lithium technology, applied in the field of electrochemical energy storage, can solve the problems of reducing battery energy density, short charge and discharge cycle time, and increasing battery quality, achieving good safety, cost reduction, and good cycle stability Effect

Active Publication Date: 2019-09-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) The charge and discharge cycle time is very short, far less than the charge and discharge cycle time of the battery
[0009] Wu Feng of Beijing Institute of Technology and others have used lithium-rich compounds with certain irreversible delithiation properties, such as lithium cobaltate and lithium manganate, which have greatly improved the assembly process of lithium-ion supercapacitors, and the manufacturing cost and safety of capacitors have been greatly improved. While obviously improving, it will also add some unnecessary mass to the battery and reduce the energy density of the battery, especially when a large amount of pre-intercalated lithium is required

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of lithium ion capacitor negative electrode. After mixing natural graphite, conductive agent, and PVDF evenly according to the mass ratio of 80:15:5, add NMP (the amount of NMP added accounts for 50% of the overall slurry), stir for 12 hours, coat on copper foil, and dry The surface density of natural graphite is 5mgcm -2 .

[0031] Preparation of positive electrode of lithium ion capacitor. After mixing activated carbon, conductive agent, PVDF, and lithium nitride evenly according to the mass ratio of 60:10:5:25, add NMP (the amount of NMP added accounts for 55% of the overall slurry) and stir for 12 hours, and coat it on aluminum foil , the surface density of activated carbon after drying is 15mgcm -2 .

[0032] Slice the above-mentioned positive and negative electrodes into 7.7cm*5cm size, and after drying thoroughly, assemble the positive electrode, negative electrode, and separator into a laminated battery, put it into an aluminum-plastic package of...

Embodiment 2

[0043] Preparation of lithium ion capacitor negative electrode. After mixing natural graphite, conductive agent, and PVDF evenly according to the mass ratio of 80:15:5, add NMP (the amount of NMP added accounts for 50% of the overall slurry), stir for 12 hours, coat on copper foil, and dry The surface density of natural graphite is 3mgcm -2 .

[0044] Preparation of positive electrode of lithium ion capacitor. After mixing activated carbon, conductive agent, PVDF, and lithium oxide according to the mass ratio of 50:10:5:35, add NMP (the amount of NMP added accounts for 55% of the overall slurry) and stir for 12 hours, and coat it on aluminum foil. The surface density of activated carbon after drying is 15mgcm -2 .

[0045] Under inert conditions, charge the battery with pre-intercalated lithium, and the current of pre-intercalated lithium is 0.01Ag -1 (Based on the quality of lithium oxide in the battery), the charging cut-off voltage is 3.5V. During the charging process...

Embodiment 3

[0047]Preparation of lithium ion capacitor negative electrode. Mix hard carbon, conductive agent, and PVDF evenly according to the mass ratio of 80:15:5, then add NMP (the amount of NMP added accounts for 50% of the overall slurry), stir for 12 hours, coat on copper foil, and dry The surface density of natural graphite is 5mgcm -2 .

[0048] Preparation of positive electrode of lithium ion capacitor. After mixing activated carbon, conductive agent, PVDF, and lithium nitride evenly according to the mass ratio of 60:10:5:25, add NMP (the amount of NMP added accounts for 55% of the overall slurry) and stir for 12 hours, and coat it on aluminum foil , the surface density of activated carbon after drying is 12mgcm -2 .

[0049] Slice the above-mentioned positive and negative electrodes into 7.7cm*5cm size, and after drying thoroughly, assemble the positive electrode, negative electrode, and separator into laminated batteries, put them into aluminum-plastic packaging of correspo...

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PUM

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Abstract

The invention relates to a lithium ion supercapacitor cathode pre-embedding lithium method. An anode, a diaphragm, a cathode and an electrolyte located between the anode and the cathode are included.An anode material comprises an active material and a pre-embedding lithium additive. The mass ratio of the pre-embedding lithium additive and a cathode material is 1:100 to 10:1. The anode, the diaphragm and the cathode are assembled into a lithium-ion supercapacitor. After the electrolyte is added, a cell is charged and pre-embedding lithium is performed. Compared with a lithium ion capacitor without pre-embedding lithium, the capacitor in the invention has good cycling stability, is safe and reliable and has low cost.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage. Background technique [0002] As an energy storage device, lithium-ion supercapacitor has the advantages of high safety, long service life and high power. It combines the advantages of ordinary electric double layer There are better application prospects in other fields. [0003] Lithium-ion supercapacitors have the following characteristics: (1) Compared with lithium-ion batteries, they have higher power density, and can better meet power requirements in high-current applications, especially high-energy pulse environments. (2) The charge-discharge cycle time is very short, much shorter than the charge-discharge cycle time of the battery. (3) The battery has a long service life and no maintenance is required for life. (4) The wide operating temperature can work normally in the range of -45 ~ 85 ℃. [0004] Most lithium-ion supercapacitors use carbonaceous materials as negative el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/50H01G11/84
Inventor 张洪章张华民曲超李先锋刘翠连
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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