Preparation method and application of FeS[x]/C/CNT composite cathode materials
A technology of negative electrode material and composite material, which is applied in the fields of material synthesis and chemical power supply, can solve the problems of the utilization rate of active materials and the deterioration of cycle performance, and achieve the effects of excellent cycle performance, improved utilization rate, and good sulfur-fixing ability.
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Embodiment 1
[0023] Embodiment 1: a kind of FeS x The preparation method of / C / CNT composite negative electrode material, concrete steps are as follows:
[0024] (1) Dissolve iron source (ferrous sulfate) into deionized water, then add carbon source (glucose) and carbon nanotubes and mix well, then add sulfur source (sodium thiosulfate), dissolve and spray dry to obtain FeS x / C / CNT composite material precursor; wherein the molar ratio of iron source (ferrous sulfate) to sulfur source (sodium thiosulfate) is 1:1, the mass of carbon source (glucose) g:iron source (ferrous sulfate) The molar ratio of the molar mass is 0.8:0.01, the mass g of carbon nanotubes: the molar ratio of the iron source (ferrous sulfate) is 0.4:0.01; the inlet temperature of the spray drying is 200°C, and the outlet temperature is 130°C ;
[0025] (2) Incorporate step (1) FeS x / C / CNT composite material precursor was calcined at 500 °C in an inert gas (argon) atmosphere for 5 h, cooled with the furnace, washed with...
Embodiment 2
[0030] Embodiment 2: present embodiment FeS x / C / CNT composite negative electrode material preparation method and embodiment 1FeS xThe preparation method of / C / CNT composite negative electrode material is basically the same, and the difference is that the carbon source is sodium carboxymethyl cellulose, and the mass g of the carbon source (sodium carboxymethyl cellulose): the mass g of the iron source (ferrous sulfate) The molar ratio of mol is 0.8:0.01; the inlet temperature of spray drying is 220 °C, and the outlet temperature is 150 °C;
[0031] The electrochemical performance testing method of this embodiment is the same as that of Example 1. From the present embodiment FeS x / C / CNT composite charge-discharge curve shows that the discharge platform is 1.7 V, and the discharge platform is almost unchanged during the cycle; from the example of FeS x Charge-discharge cycle diagram of / C / CNT composite; FeS x / C / CNT composite charge-discharge cycle at 200 mA / g current densit...
Embodiment 3
[0032] Embodiment 3: present embodiment FeS x / C / CNT composite negative electrode material preparation method and embodiment 1FeS x The preparation method of / C / CNT composite negative electrode material is basically the same, the difference is that the carbon source is soluble starch, and the ratio of the mass g of carbon source (soluble starch): the molar quantity mol of iron source (ferrous sulfate) is 0.6: 0.01; the inlet temperature of spray drying is 180°C, and the outlet temperature is 120°C;
[0033] The electrochemical performance testing method of this embodiment is the same as that of Example 1. From the present embodiment FeS x / C / CNT composite charge-discharge curve shows that the discharge platform is 1.7 V, and the discharge platform is almost unchanged during the cycle; from the example of FeS x Charge-discharge cycle diagram of / C / CNT composite; FeS x / C / CNT composite charge-discharge cycle at 200 mA / g current density, as FeS x / C / CNT composite material, th...
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