Method for preparing tin-nickel alloy of cathode materials of lithium ion battery by electrolyzing melted salt

[0023] Example 1

[0024] Will analyze pure NiO and SnO 2 The powder is mixed with a molar ratio of 3:4, 3-10wt% of graphite powder is added, wet milled in a ball mill for 3 hours, taken out and dried, weighed 2.5g of the sample, and then pressed the powder to a diameter of 10mm under 30MPa. A cylinder with a height of 3.5mm and sintered at 850~1250℃ for 2~4 hours to obtain an oxide sintered sheet; the oxide sintered sheet is hung on the iron-chromium-aluminum wire, and the periphery is wrapped with iron-chromium-aluminum wire as Cathode: A high-purity graphite rod is used as the anode. Insert it into CaCl 2 In an alumina crucible mixed with NaCl molten salt, under the protection of Ar gas, control the voltage to 2.3~3.2V for electrolysis, the electrolysis temperature is 600~750℃, after 6~10 hours of electrolysis, stop the electrolysis; cool in an inert atmosphere Then rinse with distilled water and dry, the product is pure phase Ni 3 Sn 4 alloy.

[0025] Will be prepared Ni 3 Sn 4

[0026] Example 2

[0027] Will analyze pure NiO and SnO 2 The powder is mixed with a molar ratio of 1:1, and 5-15wt% CaCO is added 3 , Wet-grind in a ball mill for 3 hours, take out and dry, then weigh 2.5g of the sample, press the powder into a cylinder with a diameter of 10mm and a height of 3.5mm under 30MPa, and sinter it at 850~1250℃ for 3~8 After hours, the oxide sintered sheet is obtained; the oxide sintered sheet is suspended on the iron-chromium-aluminum wire, and the periphery is wrapped with the iron-chromium-aluminum wire as the cathode; and the high-purity graphite rod is used as the anode. Insert it with CaCl 2 In an alumina crucible mixed with NaCl molten salt, under the protection of Ar gas, control the voltage to 2.0~3.2V for electrolysis, the electrolysis temperature is 650~780℃, after 5~8 hours of electrolysis, stop the electrolysis; cool in an inert atmosphere Then rinse with distilled water and dry, the product is Ni 3 Sn 4 / Ni 3 Sn 2 Alloy composite.

[0028]

[0029] Example 3

[0030] Will analyze pure NiO and SnO 2 Mix the powder with a molar ratio of 2:1, add 3-15wt% starch, wet-grind in a ball mill for 3 hours, take out and dry, then weigh 2.5g of the sample, and press the powder into a diameter of 10mm under 30MPa. 3.5mm cylinder, and sinter it at 850~1250℃ for 2~4 hours to obtain oxide sintered sheet; hang the oxide sintered sheet on molybdenum wire and wrap the periphery with molybdenum wire as the cathode; adopt high purity Graphite rods are used as anodes. Insert it into CaCl 2 In an alumina crucible mixed with NaCl molten salt, under the protection of Ar gas, control the voltage to 2.0~3.2V for electrolysis, the electrolysis temperature is 600~780℃, after 8~16 hours of electrolysis, stop the electrolysis; cool in an inert atmosphere Then rinse with distilled water and dry, the product is Ni / Ni 3 Sn 4 / Ni 3 Sn 2 Alloy composite.

[0031] The prepared Ni / Ni 3 Sn 4 / Ni 3 Sn 2 The alloy compound adds 10wt% conductive agent a