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Lithium ion capacitor and lithium pre-embedding method thereof

A capacitor and lithium-ion technology, applied in the field of lithium-ion capacitors, can solve problems such as low energy density, achieve the effect of increasing energy density and widening the voltage range

Pending Publication Date: 2021-11-02
北京蒙京石墨新材料科技研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a lithium ion capacitor and its pre-embedded lithium method, to solve the problem of low energy density of the entire device of the lithium ion capacitor in the prior art

Method used

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  • Lithium ion capacitor and lithium pre-embedding method thereof
  • Lithium ion capacitor and lithium pre-embedding method thereof
  • Lithium ion capacitor and lithium pre-embedding method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of positive electrode sheet:

[0039] Prepare the mixed glue solution of binder PVDF and solvent NMP (N-methylpyrrolidone) by stirring or ball milling process, add polymer monomer pyrene to the glue solution, and obtain the glue solution and A mixture of high molecular polymer monomer pyrene. Add inorganic lithium salt Li to the mixture 3 PO 4 , using stirring or ball milling process to prepare glue, high molecular polymer monomer pyrene and inorganic lithium salt Li 3 PO 4 homogeneous dispersion. Ketjen black conductive agent and activated carbon are added to the dispersion liquid, and a positive electrode slurry suitable for coating is obtained after uniform dispersion by stirring or ball milling process, wherein, the positive electrode slurry includes 9wt% high molecular polymer monomer pyrene, 10wt% Li 3 PO 4 , 63wt% activated carbon, 8wt% glue solution and 10wt% ketjen black conductive agent, the mass concentration of PVDF in the glue solution is...

Embodiment 2

[0045] The difference between embodiment 2 and embodiment 1 is that

[0046] The positive electrode slurry comprises 8wt% polymer monomer pyrene, 5wt% Li 3 PO 4 , 71wt% activated carbon, 8wt% glue and 8wt% Ketjen black conductive agent to finally obtain a lithium ion capacitor.

Embodiment 3

[0048] The difference between embodiment 3 and embodiment 1 is that

[0049] The positive electrode slurry comprises 8wt% polymer monomer pyrene, 8% Li 3 PO 4 , 64wt% activated carbon, 10wt% glue and 10wt% ketjen black conductive agent to finally obtain a lithium ion capacitor.

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Abstract

The invention provides a lithium ion capacitor and a lithium pre-embedding method thereof. The lithium ion capacitor comprises a positive plate, a negative plate, electrolyte and a diaphragm, the positive plate is prepared from positive slurry, the negative plate is prepared from negative slurry, and the positive slurry comprises active carbon, a high-molecular polymer monomer and inorganic lithium salt; the negative slurry comprises a carbon material, the mass ratio of the high-molecular polymer monomer to the inorganic lithium salt is (0.57 to 3.5): 1, and the carbon material is selected from any one or more of graphite, soft carbon and hard carbon. The mass ratio of the high-molecular polymer monomer to the inorganic lithium salt is controlled to be within the range, so that the number of lithium ions replaced with hydrogen protons is controlled, and the aim of pre-embedding lithium into the negative electrode is fulfilled. Furthermore, the carbon material is low in price, stable in performance, small in gas production rate in the using process, easy to disperse and easy to prepare the negative slurry, and the overall preparation cost is low.

Description

technical field [0001] The invention relates to the technical field of lithium ion capacitors, in particular to a lithium ion capacitor and a method for pre-embedding lithium therein. Background technique [0002] As a new type of energy storage device, lithium-ion capacitors have the advantages of high power density, high electrostatic capacity and relatively long cycle life, and are expected to be widely used in new energy vehicles, solar energy, wind energy and other fields. Among them, the existing lithium-ion capacitors mainly obtain high-performance lithium-ion capacitors by (1) regulating the microstructure of activated carbon and (2) expanding the operating voltage range of activated carbon. However, the energy density of the entire device of the current lithium-ion capacitors is still low. . Contents of the invention [0003] The main purpose of the present invention is to provide a lithium ion capacitor and its pre-embedded lithium method to solve the problem of...

Claims

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Application Information

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IPC IPC(8): H01G11/50H01G11/06H01G11/86
CPCH01G11/50H01G11/06H01G11/86Y02E60/13
Inventor 康辉展长振韩徐年周杰赵立川
Owner 北京蒙京石墨新材料科技研究院有限公司