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Conductive framework and preparation method thereof

A skeleton, nickel foam technology, applied in the field of energy storage, can solve the problems of high negative electrode reactivity, consumption of lithium source, increase of internal resistance and internal consumption of battery, etc., to improve lithophilicity and specific surface area, prolong storage life, slow down The effect of volume expansion

Inactive Publication Date: 2019-09-06
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the metal lithium negative electrode has high reactivity and is prone to side reactions with the electrolyte; it is also easy to generate lithium dendrites and dead lithium. Lithium dendrites are produced due to uneven charge distribution and volume expansion on the electrode surface. Breaking through the diaphragm will lead to a short circuit of the battery, causing a series of safety problems such as thermal runaway and battery fire and explosion; dead lithium will increase the internal resistance and internal consumption of the battery, and reduce the energy density of the battery; when metallic lithium is used as the negative electrode material, infinite volume expansion will occur , resulting in continuous rupture and repair of the SEI film, metal lithium reacts with the electrolyte, consumes the limited lithium source inside the battery, and reduces the Coulombic efficiency of the battery

Method used

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  • Conductive framework and preparation method thereof
  • Conductive framework and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] figure 1 It is a flow chart of the preparation method of the conductive framework of the present invention, such as figure 1 As shown, the preparation method of the conductive framework of the present embodiment comprises the following steps:

[0039] S01, dry the nickel foam after cleaning;

[0040] In step S01 of this embodiment, a piece of regular nickel foam (NF) is selected first, and then the nickel foam is cleaned and then dried. The cleaning process specifically includes: sequentially immersing the nickel foam in acetone, ethanol, hydrochloric acid, and deionized water for ultrasonic cleaning. The ultrasonic cleaning time is 15 minutes; Drying is carried out in the furnace, and after the drying is completed, a spare clean foamed nickel sheet can be obtained.

[0041] S02, configuring a reaction solution of cobalt nitrate and urea to obtain a precursor;

[0042] In step S02 of this embodiment, it is necessary to use the dried nickel foam as a substrate to pre...

Embodiment 2

[0053] As another embodiment of this description, different from Example 1, in step S01 of this embodiment, a piece of regular foamed nickel (NF) is first selected, the thickness of foamed nickel is 1mm, and the size of foamed nickel is 2.5 mm. ×5cm, on the basis of this embodiment, the thickness and size of the nickel foam can be selected according to the size of the battery to be assembled in actual production.

[0054] In step S02 of this embodiment, the molar ratio of cobalt nitrate and urea is 1:2, the volume ratio of methanol and ethanol is 1:1, and the magnetic stirring time is 30 min. On the basis of this example, the molar ratio of cobalt nitrate to urea, the volume ratio of methanol to ethanol and the time of magnetic stirring can be selected in actual production.

[0055] In step S03 of this embodiment, the reaction time in the oven is 12h.

[0056] In step S05 of this embodiment, the dried nickel foam coated with the precursor is placed in a tube furnace to heat up ...

Embodiment 3

[0059] As yet another embodiment of this specification, different from Example 2, in step S03 of this example, the nickel foam coated with cobalt tetraoxide nanosheets obtained after the reaction time in the oven is 8h, wherein the cobalt tetraoxide nanosheets It is looser than the cobalt tetraoxide nanosheets in Example 2.

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Abstract

The invention provides a conductive framework and a preparation method thereof. The preparation method comprises the following steps of carrying out complete cleaning and then drying treatment on foamed nickel; preparing a reaction solution of cobalt nitrate and urea to obtain a precursor; putting the foamed nickel into the reaction solution, and coating the precursor on the foamed nickel by a solvothermal method; taking out the foamed nickel coated with the precursor, and carrying out cleaning and drying; and carrying out calcining on the dried foamed nickel coated with the precursor, and obtaining the foamed nickel coated with a cobaltosic oxide nanosheet. The outer layer with the foamed nickel as the conductive framework is coated with the cobaltosic oxide nanosheet, and the cobaltosicoxide nanosheet can improve the lipophilicity and enlarge the specific surface area of the foamed nickel, so that faster melting and filling of lithium; can be facilitated; and in addition, the foamednickel coated with the cobaltosic oxide nanosheet is used as a framework material of the lithium metal, so that the volume expansion of a lithium negative electrode can be reduced, the growth of thelithium dendritic crystal is inhibited, the storage life of the battery is prolonged, and high practicability is achieved.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to a conductive framework and a preparation method thereof. Background technique [0002] At present, the rapid development of mobile devices, electric vehicles and smart grids has led to a lot of attention and research on high-energy-density secondary batteries, among which lithium metal is considered to be used for electrochemical energy due to its high specific capacity and low reduction potential. One of the most promising anode materials for storage. However, the metal lithium negative electrode has high reactivity and is prone to side reactions with the electrolyte; it is also easy to generate lithium dendrites and dead lithium. Lithium dendrites are produced due to uneven charge distribution and volume expansion on the electrode surface. Breaking through the diaphragm will lead to a short circuit of the battery, causing a series of safety problems such as thermal runa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/80
CPCH01M4/661H01M4/667H01M4/808H01M2004/027Y02E60/10
Inventor 郭萍梅黄高旭梁济元刘翠
Owner JIANGHAN UNIVERSITY
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