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Preparing method of cathode piece for lithium-ion capacitor

A technology of capacitors and lithium ions, which is applied in the field of preparation of negative electrodes for lithium ion capacitors, can solve the problems of low compaction density and poor adhesion, and achieve the effects of low production cost, small internal resistance and long cycle life

Inactive Publication Date: 2018-08-21
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of preparation method of negative electrode sheet for lithium ion capacitor, comprising the steps of:

Method used

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  • Preparing method of cathode piece for lithium-ion capacitor

Examples

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Embodiment 1

[0041] 1) Weigh 880 grams of natural flake graphite, 30 grams of SLMP and 30 grams of acetylene black and add them to a planetary mixer and stir for 30 minutes, respectively add 1000 grams of propylene carbonate and 60 grams of fluororubber and knead for 120 minutes to obtain a slushy crude product with evenly distributed SLMP ;

[0042] 2) hot rolling the slimy crude product obtained in step 1) at 80°C for 16 times with a hot roller press to obtain a rough film with a propylene carbonate content of 12.3 wt%, and vacuum-drying the rough film at 150°C for 12 hours and Finish rolling to obtain a dry electrode film with a thickness of 30 μm;

[0043] 3) Thermally compound the dry electrode film obtained in step 2) on a 15 μm thick carbon-coated copper foil with a thermal compound machine to obtain a 75 μm lithium ion capacitor negative electrode sheet, and measure its compaction density by weighing method;

[0044] 4) Activated carbon, conductive carbon black and polyacrylonitri...

Embodiment 2

[0050] 1) Weigh 880 grams of artificial graphite, 30 grams of SLMP and 30 grams of metal copper powder into a multi-roller mixer and mix for 30 minutes, respectively add 1000 grams of ethylene carbonate and 60 grams of polytetrafluoroethylene and knead for 120 minutes to obtain a uniform distribution of SLMP. Ooze-like crude product;

[0051] 2) Hot rolling the slimy crude product obtained in step 1) at 120°C for 11 times with a hot roller press to obtain a rough film with an ethylene carbonate content of 8.9 wt%, and vacuum-drying the rough film at 150°C for 12 hours and Finish rolling to obtain a dry electrode film with a thickness of 30 μm;

[0052] 3) Thermally compound the dry electrode film obtained in step 2) on a 15 μm thick carbon-coated copper foil with a thermal compound machine to obtain a 75 μm lithium ion capacitor negative electrode sheet, and measure its compaction density by weighing method;

[0053] 4) Activated carbon, conductive carbon black and polyacrylo...

Embodiment 3

[0059] 1) Weigh 880 grams of expanded graphite, 30 grams of SLMP and 30 grams of Ketjen black and add them to an internal mixer and stir for 30 minutes, add 1000 grams of dimethyl carbonate and 60 grams of ultra-high molecular weight polyethylene and knead for 120 minutes to obtain a uniform distribution of SLMP. Ooze-like crude product;

[0060] 2) Hot rolling the slimy crude product obtained in step 1) at 60°C for 20 times with a hot roller press to obtain a rough film with a dimethyl carbonate content of 19.6 wt%, and vacuum-dry the rough film at 150°C for 12 hours and finish rolling to obtain a dry electrode film with a thickness of 30 μm;

[0061] 3) Thermally compound the dry electrode film obtained in step 2) on a 15 μm thick carbon-coated copper foil with a thermal compound machine to obtain a 75 μm lithium ion capacitor negative electrode sheet, and measure its compaction density by weighing method;

[0062] 4) Activated carbon, conductive carbon black and polyacrylo...

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Abstract

The invention discloses a preparing method of cathode piece for a lithium-ion capacitor, comprising the steps (1) cathode active materials, SLMP, a conductive agent, a binding agent are fully blendedin a solvent, obtaining soft-mud-shaped crude products; (2) the soft-mud-shaped crude products obtained in the step (1) undergo step-by-step hot pressing, generating rough films with low solvent content, and then the rough films undergo vacuum drying and finish rolling, obtaining dry electrode films containing SLMP; (3) the dry electrode film of the step (2) is applied to carbon-coating copper foil in a heating manner, obtaining a cathode piece for a lithium-ion capacitor. The invention is advantageous in that the disadvantages of the prior art that bonding is poor, compaction density is low,and product lithium-embedding depth and uniformity are poor can be resolved; the obtained cathode piece for the lithium-ion capacitor are assembled with EDLC positive plates, separators, electrolyte and a housing, obtaining a lithium-ion capacitor body, which has high volume capacitance, small internal resistance and long cycling service lifetime after formation.

Description

technical field [0001] The invention relates to an energy storage electronic device, in particular to a method for preparing a negative electrode sheet for a lithium ion capacitor. technical background [0002] With the development of science and technology, lithium-ion batteries, which have the advantages of high energy density, high reliability and good processability, are becoming more and more popular, and are widely used in various portable electronic devices. Due to the large internal resistance and low power density of traditional lithium-ion batteries, their applicability is limited. At the same time, although electrochemical double-layer capacitors (EDLC) have long cycle life, wide temperature range, and high power density, there are also problems such as low capacity, low operating voltage, low energy density, and poor self-discharge, which also greatly limit the electric capacity. Applicability of chemical electric double layer capacitors. Unlike supercapacitors...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/50H01G11/06H01G11/84
CPCH01G11/06H01G11/50H01G11/84H01G11/86Y02E60/13
Inventor 张啟文何凤荣郭德超郭义敏袁媛龙超昝亚辉
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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