A kind of lithium ion capacitor and preparation method thereof

A technology of capacitors and lithium ions, which is applied in the field of new energy storage, can solve problems such as difficult precise control requirements, high prices, and unsafety, and achieve the effects of improving safety and reliability, reducing production costs, and shortening cycle life

Active Publication Date: 2020-06-09
NINGBO CRRC NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the preparation process of the product, the chemical properties of lithium metal are extremely active, unsafe, and have high environmental requirements; secondly, because the pre-intercalation lithium process requires accurate control of the amount of lithium intercalation, this makes it difficult to use metal lithium sheets as lithium sources. Satisfy the requirements of precise control; moreover, when using porous metal current collectors, the material coating process is complicated, resulting in insufficient industrialization of lithium-ion capacitors and high prices

Method used

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  • A kind of lithium ion capacitor and preparation method thereof
  • A kind of lithium ion capacitor and preparation method thereof
  • A kind of lithium ion capacitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0042] The lithium ion capacitor in Examples 1 to 5 includes a positive electrode sheet, a negative electrode sheet, a separator and an electrolyte. The positive electrode sheet, the negative electrode sheet and the separator are immersed in the electrolyte,

[0043] The thickness of the positive electrode sheet is 200-240μm. The positive electrode sheet includes a positive electrode current collector and a positive electrode material coated on the positive electrode current collector. The positive electrode current collector is non-porous corroded aluminum foil or non-porous stainless steel foil. The positive electrode material includes the following mass percentage components:

[0044] Activated carbon: 30~60%,

[0045] LiFePO 4 +NCM: 15~50%,

[0046] Li 6 CoO 4 : 5~20%,

[0047] Positive electrode conductive agent: 3-8%,

[0048] Positive electrode binder: 5-12%,

[0049] LiFePO 4 And LiNi 0.5 Co 0.3 Mn 0.2 O 2 The mass ratio is 1:4~3:2.

[0050] The thickness of the negative electrode ...

Embodiment 6～10

[0068] The preparation method of the lithium ion capacitor in Examples 6-10 includes the following steps:

[0069] (1) Prepare raw materials: prepare raw materials according to the components and contents in Example 1;

[0070] (2) Preparation of positive electrode sheet: combining activated carbon, LiFePO 4 , NCM, Li 6 CoO 4 , The positive electrode conductive agent and the positive electrode binder are dissolved in NMP in sequence, and the high-speed stirring equipment is used to stir for 4-6h at -0.03~-0.1MPa vacuum pressure and 8000~10000r / min stirring speed for vacuum high-speed dispersion treatment to form a uniform positive electrode In the process of the slurry, the vacuum high-speed dispersion treatment is carried out at the same time with a power of 500w ultrasonic treatment, the positive electrode slurry is coated on the positive and negative sides of the positive current collector, and the coating is dried stepwise. The drying system is different from multiple sections. ...

Embodiment 11～14

[0077] The raw materials were prepared according to the components and contents of Examples 2 to 5 respectively, and the lithium ion capacitor was prepared according to the preparation method in Example 6.

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Abstract

The invention relates to a lithium ion capacitor and a preparation method thereof, wherein the lithium ion capacitor and the preparation method belong to the field of new energy storage technology. According to the lithium ion capacitor, an anode comprises an anode current collector and an anode active material which is coated on the anode current collector. The anode active material comprises active carbon, LiFePO4, LiNi0.5Co0.3Mn0.2O2 and Li6CoO4. The lithium ion capacitor has advantages of simple preparation process and high energy density.

Description

Technical field [0001] The invention belongs to the technical field of new energy storage, and relates to a lithium ion capacitor and a preparation method thereof. Background technique [0002] With the development of science and technology, various energy storage devices have been greatly developed. As a new type of energy storage device between supercapacitors and lithium ion batteries, lithium ion capacitors have the advantages of high energy density, high power density and long cycle life. It is expected to be used in new energy vehicles, solar energy, wind energy, and military industries. It is widely used in aerospace and other fields. [0003] The negative electrode of lithium ion capacitor adopts carbon materials (such as graphite, soft carbon, hard carbon) that can release lithium ions, which overcomes the shortcomings of high self-discharge rate of ordinary supercapacitors. The positive electrode adopts carbon materials that physically and chemically adsorb lithium ions ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/68H01G11/46H01G11/32H01G11/06
CPCH01G11/06H01G11/32H01G11/46H01G11/68Y02E60/13
Inventor 阮殿波刘秋香杨斌丁升
Owner NINGBO CRRC NEW ENERGY TECH CO LTD
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