Lithium ion capacitor and preparation method thereof

A lithium ion and capacitor technology, applied in the field of high energy density lithium ion capacitors and their preparation, can solve the problems of slow electrochemical response of battery-type negative electrodes, achieve good cycle stability, realize regulation, and realize energy density and rate performance. Effect

Inactive Publication Date: 2019-01-18
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the slow electrochemical response of its battery-type negative electrode, the current power density (<5kW / kg) of lithium-ion capacitors still cannot meet the needs of actual use.

Method used

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  • Lithium ion capacitor and preparation method thereof
  • Lithium ion capacitor and preparation method thereof

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preparation example Construction

[0022] refer to figure 1 , The embodiment of the present invention provides a kind of preparation method of lithium ion capacitor, comprises the following steps:

[0023] S101: providing a nano-ferric oxide material and an activated carbon material, controlling the mass ratio of the nano-ferric oxide material to the activated carbon material to be 1:(1-5);

[0024] S102: preparing the active carbon material to obtain the positive electrode sheet of lithium ion capacitor;

[0025] S103: Prepare the nano-ferric oxide material to obtain the ferric oxide electrode sheet, and pre-lithiate the ferric oxide electrode sheet to obtain the negative electrode sheet of the lithium ion capacitor;

[0026] S104: Assembling the lithium ion capacitor by using the positive electrode sheet of the lithium ion capacitor and the negative electrode sheet of the lithium ion capacitor, and using an organic electrolyte.

[0027] In step S101, preferably, the specific surface area of ​​the activated ...

Embodiment 1

[0037] The preparation method of the high-energy lithium-ion capacitor with the nano ferric oxide material as the negative electrode comprises the following steps:

[0038] Provide nano ferric oxide material and activated carbon material, and control the mass ratio of nano ferric oxide material to activated carbon material to be 1:1.

[0039] The specific surface area is 1200m 2 / g, the pore volume is 0.5cm3 / g of activated carbon, mixed with conductive additive acetylene black, and binder PVDF according to the mass ratio of 75:10:15, and the organic solvent NMP was added to obtain the positive electrode slurry. The positive electrode slurry is coated on the aluminum foil, and the lithium ion capacitor positive electrode sheet is obtained after drying, rolling and punching.

[0040] Nano ferric oxide material, D 50 =70nm, mixed evenly with the conductive additive acetylene black, and the binder sodium alginate according to the mass ratio of 70:20:10, and added the solvent de...

Embodiment 2

[0043] The preparation method of the high-energy lithium-ion capacitor with the nano ferric oxide material as the negative electrode comprises the following steps:

[0044] Provide nano ferric oxide material and activated carbon material, and control the mass ratio of nano ferric oxide material to activated carbon material to be 1:2.

[0045] The specific surface area is 1600m 2 / g, the pore volume is 0.8cm 3 / g of activated carbon, mixed with the conductive additive Super P, and the binder PVDF according to the mass ratio of 80:10:10, and the organic solvent NMP was added to obtain the positive electrode slurry. The positive electrode slurry is evenly coated on the aluminum foil, and the positive electrode sheet of the lithium ion capacitor is obtained after drying, rolling and punching.

[0046] The nano iron ferric oxide negative electrode material, D 50 =150nm, mixed with the conductive additive acetylene black, and the binder sodium alginate according to the mass ratio...

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Abstract

The invention provides a preparation method of a lithium ion capacitor, comprising the following steps: providing a nanometer ferric oxide material and an activated carbon material, and controlling the mass ratio of the nanometer ferric oxide material and the activated carbon material to be 1: (1-5); A lithium ion capacitor positive electrode sheet prepare from that activated carbon material; A lithium ion capacitor negative electrode sheet is obtain by preparing that nanometer ferric tetroxide material to obtain ferric tetroxide electrode sheet and pre-lithium lithium the ferric tetroxide electrode sheet; A lithium ion capacitor is assemble by adopting a positive electrode chip of that lithium ion capacitor and a negative electrode chip of the lithium ion capacitor, and adopt an organic electrolyte. The lithium ion capacitor exhibits excellent capacitance performance, high energy density and good cycle stability.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion capacitors, and relates to a high-energy-density lithium-ion capacitor in which a pre-lithiated nanometer iron tetroxide material is used as a negative electrode and activated carbon is used as a positive electrode, and a preparation method thereof. Background technique [0002] Both traditional electric double layer capacitors and lithium-ion batteries are novel energy storage and conversion devices, each with the advantages of high rate and high energy, but both have obvious shortcomings. Lithium-ion capacitors combine the advantages of traditional electric double layer and lithium-ion batteries. The negative electrode uses a battery-type electrode, and the positive electrode uses a capacitive electrode. The device can output high energy density and power density, and has stable cycle performance. Therefore, lithium-ion capacitors can not only be used in various portable small electronic dev...

Claims

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Application Information

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IPC IPC(8): H01G11/06H01G11/50H01G11/46H01G11/34H01G11/84
CPCH01G11/06H01G11/34H01G11/46H01G11/50H01G11/84Y02E60/13
Inventor 韩翠平徐磊石蕊英秦显营李宝华贺艳兵杜鸿达康飞宇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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