A kind of znmn2o4 hollow rod and its preparation method and application
A technology of hollow rods and zinc salts, applied in chemical instruments and methods, manganate/permanganate, structural parts, etc., can solve the problems of poor conductivity of transition metal oxides, pulverization of electrode active materials, and specific capacity of graphite materials Low-level problems, to achieve the effect of alleviating the volume expansion problem, good lithium storage capacity, and multiple active sites
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Embodiment 1
[0028] (1) Add 0.75 mmol of oxalic acid dihydrate to a mixed solution of 20 ml of absolute ethanol, 60 ml of polyethylene glycol 400 and 10 ml of deionized water, and the concentration of the oxalic acid solution is 0.008 mol / L.
[0029] (2) Take 0.5 mmol of ZnCl 2 and 1 mmol of MnCl 2 ·4H 2 O was added to the above mixed solution. Stir at room temperature for 6 h.
[0030] (3) The obtained liquid was centrifuged with a centrifuge to collect the precipitate, washed three times with water and twice with ethanol, and dried in an oven at 60 °C for 12 h to obtain a hollow rod precursor.
[0031] (4) The precursor was calcined in a muffle furnace, 1 °C / min, heated to 400 °C, and held for 2 h to obtain the target product ZnMn 2 O 4 Hollow rod.
Embodiment 2
[0033] (1) Add 1.5 mmol of oxalic acid dihydrate to a mixed solution of 20 ml of absolute ethanol, 30 ml of polyethylene glycol 400 and 10 ml of deionized water, and the concentration of the oxalic acid solution is 0.025 mol / L at this time.
[0034] (2) Take 0.5 mmol of Zn(NO 3 ) 2 ·6H 2 O and 1 mmol of MnCl 2 ·4H 2 O was added to the above mixed solution. Stir at room temperature for 6 h.
[0035] (3) The obtained liquid was centrifuged with a centrifuge to collect the precipitate, washed three times with water and twice with ethanol, and dried in an oven at 60 °C for 12 h to obtain a hollow rod precursor.
[0036] (4) The precursor was calcined in a muffle furnace, heated at 1 °C / min to 400 °C, and kept for 2 h to obtain the target product ZnMn 2 O 4 Hollow rod.
Embodiment 3
[0038] (1) Add 2.25 mmol of oxalic acid dihydrate to a mixed solution of 20 ml of absolute ethanol, 10 ml of polyethylene glycol 400 and 10 ml of deionized water, and the concentration of the oxalic acid solution is 0.056 mol / L.
[0039] (2) Take 0.5 mmol of Zn(CH 3 COO) 2 ·2H 2 O and 1 mmol of MnCl 2 ·4H 2 O was added to the above mixed solution. Stir at room temperature for 6 h.
[0040] (3) The obtained liquid was centrifuged with a centrifuge to collect the precipitate, washed three times with water and twice with ethanol, and dried in an oven at 60 °C for 12 h to obtain a hollow rod precursor.
[0041] (4) The precursor was calcined in a muffle furnace, heated at 1 °C / min to 450 °C, and kept for 2 h to obtain the target product ZnMn 2 O 4 Hollow rod.
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