Method for preparing lithium and sodium ion battery electrode material and modified battery diaphragm
A sodium-ion battery and electrode material technology, applied in battery electrodes, lithium batteries, nanotechnology for materials and surface science, etc., can solve problems such as poor conductivity, volume expansion of transition metal sulfides, etc., achieve short absorption rate, Good energy storage effect, rate performance and improved cycle stability
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Embodiment 1
[0034] Example 1 Preparation of CoNiMo-S@NC nanocomposite
[0035] 30ml of N,N-dimethylformamide and 15ml of glycerol were mixed into mixed solution A, and the amount of material was 0.3mmol hexahydrate nickel nitrate solid powder and 0.6mmol hexahydrate cobalt nitrate solid powder and 0.3 mmol in turn. The ammonium molybdate tetrahydrate solid powder of mmol is dissolved in the above-mentioned mixed solution A, and ultrasonically stirred for 30 minutes to obtain mixed solution B, and then 1.2 mmol of terephthalic acid solid powder is added to the above-mentioned mixed solution B to dissolve completely to obtain mixed solution. Liquid C; the mixed liquid C was put into the autoclave, and then put into an oven to react at 180° C. for 6 hours, and then centrifuged and washed with a centrifuge to obtain the Co-Ni-Mo precursor solid precipitate. The precursor was placed in an oven and dried at a temperature of 80°C. Then, 1 g of Co-Ni-Mo precursor solid powder was dissolved in 20...
Embodiment 2
[0038] Example 2 Preparation of electrodes
[0039] 70 mg of CoNiMo-S@NC powder and 20 mg of acetylene black powder and 10 mg of polyvinylidene fluoride (PVDF) solution were mixed together, and the mixture was dispersed in N-methylpyrrolidone (NMP) solution using an agate mortar. Grind into a uniform slurry, and then evenly apply it on the copper foil. The coated copper foil was then dried in a vacuum oven at a temperature of 70 °C for 12 hours, and cut into electrodes with a radius of 6 mm.
Embodiment 3
[0040] Example 3 Preparation of lithium-ion batteries and sodium-ion batteries
[0041] Lithium metal and sodium metal were used as positive electrodes respectively, the electrodes obtained in Example 2 were used as negative electrodes, and Celgard 2325 commercial separators were used to assemble two kinds of button batteries, lithium ion battery and sodium ion battery, in the glove box. The lithium ion battery added 60 μl The electrolyte, lithium-ion battery uses secondary electrolyte (LB-008); sodium-ion battery adds 80 microliters of electrolyte, sodium-ion battery uses sodium trifluoromethanesulfonate electrolyte (NS-001).
[0042] like Figure 7 , the lithium-ion battery described in this example can maintain a high capacity of 411mAh / g after 10,000 cycles at a high-density current of 5A / g, and the overall attenuation is not large. 411mAh / g, the average attenuation per turn is 0.0215mAh / g, and the Coulomb efficiency is always maintained at about 100%, with strong stabili...
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