Amorphous germanium-based nanowire-graphene nano composite lithium ion battery negative electrode material and preparation method thereof
A lithium-ion battery and negative electrode material technology, applied in the field of electrochemistry, can solve problems such as poor cycle performance, large volume change, and poor conductivity, and achieve the effects of improved conductivity, simple preparation process, and high specific capacity
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Embodiment 1
[0034] Example 1—Weighed 0.29g of CaGe2 powder, dispersed it in a mixed solution of 1.4ml of deionized water and 28ml of DMF, stirred and reacted at room temperature at 2000r / min for 1 day (24 hours per day). Then it was centrifuged at 3000r / min, the upper layer liquid was suction filtered, washed three times with methanol and deionized water, and dried in a vacuum oven at 80°C for 12 hours to obtain hydrated Ca5Ge2O9 nanowires. Under the protection of argon in a tube furnace, the temperature was raised to 400° C. at 5° C. / min for 2 hours, and then cooled to room temperature naturally to obtain amorphous Ca5Ge2O9 nanowires. Weigh the resulting amorphous Ca5Ge2O9 nanowires (56 mg), disperse RGO (7 mg) and SP (49 mg) in 17 ml of isopropanol and sonicate them for 0.5 h, then filter them with suction, and dry them in vacuum at 60 °C for 12 h to obtain Ca5Ge2O9 / RGO / SP nanocomposite anode material.
Embodiment 2
[0035]Example 2 - 0.29g of CaGe2 powder was weighed, dispersed in a mixed solution of 14ml of deionized water and 140ml of acetonitrile, stirred and reacted at 1500r / min at room temperature for 2 days. Then it was centrifuged at 4000r / min, the upper layer liquid was suction filtered, washed three times with methanol and deionized water, and dried in a vacuum oven at 70°C for 18 hours to obtain hydrated Ca5Ge2O9 nanowires. Then, under the protection of argon in a tube furnace, the temperature was raised to 400° C. for 3 hours at 8° C. / min, and then naturally cooled to room temperature to obtain amorphous Ca5Ge2O9 nanowires. Weigh the resulting amorphous Ca5Ge2O9 nanowires (65 mg), disperse RGO (7 mg) and SP (28 mg) in 10 ml of isopropanol and sonicate them for 0.8 h, then filter them with suction, and dry them in vacuum at 70 °C for 18 h to obtain Ca5Ge2O9 / RGO / SP nanocomposite anode material.
Embodiment 3
[0036] Example 3—Weigh 0.29g of CaGe2 powder, disperse it in 28ml of deionized water, and stir it at room temperature at 900r / min for 4 days. Then it was centrifuged at 5000r / min, the upper layer liquid was suction filtered, washed three times with isopropanol and deionized water respectively, and dried in a vacuum oven at 60°C for 24 hours to obtain hydrated Ca5Ge2O9 nanowires. Under the protection of argon in a tube furnace, the temperature was raised to 400°C at 10°C / min for 4h, and then cooled to room temperature naturally to obtain amorphous Ca5Ge2O9 nanowires. Weigh the resulting amorphous Ca5Ge2O9 nanowires (80mg), disperse them in 20ml of isopropanol and sonicate them for 1h, then vacuum-dry them at 80°C for 24h to obtain Ca5Ge2O9 / RGO / SP Nanocomposite anode materials.
[0037] Adopt Hitachi S-4800 field emission scanning electron microscope to observe product morphology, such as figure 1 As shown, the annealed product is a nanowire with a diameter between 20-110nm an...
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