Production method for tin-copper-cobalt ternary alloy cathode material of lithium ion battery

The present invention discloses a preparation method of lithium-ion battery by Sn-Cu-Co alloy negative-pole materials, pertaining to the art of lithium-ion battery technology. The method is a carbon thermal reduction method to calculate the amount of Sn, Cu and Co oxides according to the Sn/(Cu+Co) atomic ratio of 3:1-2:3; wherein, the atomic ratio of Cu/Co is 5:1-1:5; the amount of carbon powder is calculated in terms of CO which is reduced from the oxygen in all oxides. After being evenly mixed and ground, the raw material is placed in a flowing protection atmosphere so as to rise to the required target temperature at a heating rate of 2-30 DEG C per minute and after a certain time of insulation, the temperature of the raw material declines to the room temperature with the cooling of furnace. The present invention has the advantages of low material cost, simple preparation process, less time consumption, high yield, good safety, great application value in material preparation and suitability for mass production. The Sn-Cu-Co alloy has the advantages that crystallization is higher; the inside is full of micron particles in a loose structure with a smaller surface, which are difficult to reunite in the electrode cycling process; the existence of the two non-active components Cu and Co greatly releases the volume changes in the electrode cycling process and is conducive to enhancing the stability of the electrode cycling.