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

[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.

[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

[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.