Application of bromide-intercalated lamellar Co2+/Co3+ hydroxide in lithium-air batteries

A lithium-air battery, hydroxide technology, applied in cobalt oxide/cobalt hydroxide, fuel cell-type half-cell and secondary battery-type half-cell, battery electrodes, etc., can solve the problem of high price, poor catalytic performance, It is difficult to popularize and other problems to achieve the effect of low price, good catalytic activity, and improved cycle stability

Inactive Publication Date: 2017-08-18
BEIJING NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Precious metals such as Pt, Ru, Pd, and Ir are used as positive electrode catalysts, which are relatively expensive and d

Method used

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  • Application of bromide-intercalated lamellar Co2+/Co3+ hydroxide in lithium-air batteries
  • Application of bromide-intercalated lamellar Co2+/Co3+ hydroxide in lithium-air batteries
  • Application of bromide-intercalated lamellar Co2+/Co3+ hydroxide in lithium-air batteries

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0042] Example 1 Preparation of β-Co(OH) 2

[0043] First, take 1000ml of deionized water and add it to a round-bottomed flask. Under nitrogen protection, heat and boil. After cooling to room temperature naturally, take 1.2g of cobalt chloride hexahydrate and 12.6g of hexamethylenetetramine (HMT). In the flask, feed nitrogen gas and supplemented by magnetic stirring, heat to 100°C for three hours, then perform centrifugal filtration, wash the obtained powder twice with deionized water and ethanol, and place in a vacuum oven at a temperature of 80°C 12h. After drying, a pinkish-purple solid powder is obtained, that is, β-Co(OH) 2 .

Example Embodiment

[0044] Example 2 Preparation of bromine-intercalated layered Co 2+ / Co 3+ Hydroxide (hereinafter referred to as Br-LDHs)

[0045] The 0.25gβ-Co(OH) synthesized by embodiment 1 2 The sample was placed in 200ml of carbon tetrachloride solution and mechanically stirred until it was evenly dispersed, then 2ml of liquid bromine was added, and after stirring at room temperature for 12 hours, it was suction filtered and washed with carbon tetrachloride until the carbon tetrachloride was clear. At this time, the product The liquid bromine in the solution has been removed, and then placed in an oven at 80°C for 12 hours, and dried to obtain brown-gray Br-LDHs.

[0046] Characterization Examples

Example Embodiment

[0047] Embodiment 3 XRD analysis

[0048] Adopt the X-ray powder diffractometer (model: X Pert PRO MPD) that Holland Phillips company produces to the β-Co(OH) that embodiment 1 prepares 2 1. The Br-LDHs prepared in Example 2 were characterized by XRD, the radioactive source was Cu-Ka, the measurement step was 0.017°, and the scan time was 10 seconds / step. The result is as figure 1 shown;

[0049] from figure 1 It can be seen from the figure (b) that the synthesized precursor β-Co(OH) 2 The diffraction peaks are consistent with the standard card (JCPDS30-0443); figure 1 It can be seen from the figure (a) in the figure that the β-Co(OH) treated with liquid bromine 2 (ie Br-LDHs), the interplanar spacing of the (001) crystal plane increases from 4.6A to 7.8A, which is closely related to the intercalation of bromide ions into the interlayer, and part of the divalent cobalt is oxidized into trivalent cobalt.

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Abstract

An embodiment of the invention first provides application of bromide-intercalated lamellar Co2+/Co3+ hydroxide in lithium-air batteries, wherein the bromide-intercalated lamellar Co2+/Co3+ hydroxide acts as a cathode catalyst for a lithium-air battery. The embodiment of the invention also provides a lithium-air battery, comprising the lithium-air battery cathode provided by the embodiment of the invention.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to bromine-intercalated layered Co 2+ / Co 3+ Applications of hydroxides in lithium-air batteries. Background technique [0002] In recent years, with the continuous development of electronic products, the requirements for energy storage will be much higher than in the past. Lithium-ion batteries play an important role in energy storage due to their high mass-specific capacity and volume-specific capacity. Since the advent of lithium-ion batteries in 1991, lithium-ion batteries have become power storage devices for portable electronic devices. However, the highest energy that lithium-ion batteries can store is still not enough to meet the needs of the current market. It is imminent to find an energy storage device that surpasses lithium-ion batteries in cycle performance and mass specific capacity. Li-air battery (referred to as Li-O 2 battery) is an important researc...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M12/08C01G51/04
CPCH01M4/9016H01M12/08C01G51/04Y02E60/10
Inventor 杨晓晶孙泽民孙根班
Owner BEIJING NORMAL UNIVERSITY
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