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Hybrid capacitor and manufacturing method thereof

一种混合电容器、电容器的技术，应用在混合/双电层电容器制造、混合电容器、混合电容器电极等方向，能够解决充放电循环可靠性问题、难极速充放电等问题

Active Publication Date: 2019-02-05
NIPPON CHIMI CON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with electric double-layer capacitors, lithium-ion secondary batteries have the advantages of being able to operate at high voltages and having a large energy density, but it is difficult to perform extremely fast charging and discharging, and there are also problems in the reliability of charging and discharging cycles.

Method used

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  • Hybrid capacitor and manufacturing method thereof
  • Hybrid capacitor and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] (4-1. Negative electrode active material)

[0103] The following three steps are performed to generate a three-dimensional network structure negative electrode active material. First, 20 g of carbon nanofibers and 245 g of titanium tetraisopropoxide were added to 1300 g of isopropanol. The weight ratio of titanium alkoxide to carbon nanofibers is selected so that the weight ratio of lithium titanate to carbon nanofibers after the first step is about 8:2.

[0104] The obtained liquid is introduced into the inner cylinder of the reactor to apply 35000kgms to the liquid -2 The centrifugal force makes the inner cylinder rotate for 300 seconds, so that the carbon nanofibers are highly dispersed in the liquid. The reactor includes a concentric cylinder of the outer cylinder and the inner cylinder, and a through hole is provided on the side of the inner cylinder, and the outer cylinder The opening is provided with a baffle.

[0105] Furthermore, 165 g of acetic acid and 50 ...

example 1

[0111] Compared with Example 1, the negative electrode active material is different. The negative electrode active material 2 a of Comparative Example 1 is lithium titanate particles produced without using carbon. That is, to an aqueous solution of 38 g of lithium hydroxide and 800 g of water, 87 g of titanium oxide (TiO 2 ), stirring to obtain a solution. The solution was introduced into a spray drying apparatus and spray-dried to obtain a dry product. The obtained dried granules were heat-treated at a temperature of 700° C. for 3 hours in the air to obtain lithium titanate particles.

[0112] With regard to the lithium titanate particles, since no carbon is present in the production step, there are no voids obtained by removing carbon, and thus do not have a three-dimensional network structure. The configuration other than the hybrid capacitor such as positive and negative current collectors, separators, and electrolyte solutions is the same as that of Example 1.

[0113...

Embodiment 1-1

[0126] In Example 1, 100 g of the product obtained by heat treatment in a nitrogen atmosphere was subjected to heat treatment in an oxygen atmosphere at 500° C. for 6 hours, while in Example 1-1, at 350° C. A negative electrode active material was obtained in the same manner as in Example 1 except that 100 g of the product obtained by the heat treatment in a nitrogen atmosphere was heat-treated for 3 hours.

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Abstract

A hybrid capacitor with further increased energy density, and a manufacturing method thereof are provided. This hybrid capacitor is configured from a positive electrode which is a polarizable electrode that has double-layer capacitance, and a negative electrode which has a negative electrode active substance which can occlude and release lithium ions and which is formed from metal compound particles having a three-dimensional network structure, wherein, as an electrolyte, the electrolytic solution contains lithium salts in a molar concentration greater than or equal to 1.6M.

Description

technical field [0001] The invention relates to a hybrid capacitor comprising a negative electrode capable of storing and releasing lithium ions and a positive electrode with electric double-layer capacitance. Background technique [0002] In an electric double layer capacitor including a positive electrode and a negative electrode mainly composed of activated carbon, charge and discharge are performed by adsorption / desorption of cations and anions in the electrolytic solution to the activated carbon. The electric double-layer capacitor has the advantages of being capable of extremely fast charge and discharge, having excellent output characteristics, and excellent charge-discharge cycle characteristics, but has a problem of low energy density. On the other hand, in a lithium secondary battery in which a material capable of storing and releasing lithium ions is used as a positive electrode active material and a negative electrode active material, lithium ions are released fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/46H01G11/06H01G11/24H01G11/60H01G11/62H01G11/84
CPCH01G11/06H01G11/24H01G11/46H01G11/60H01G11/62H01G11/84H01G11/50Y02E60/13H01G11/32H01G11/26H01G11/86
Inventor 爪田覚大仓数马玉光贤次
Owner NIPPON CHIMI CON CORP
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