Preparation method of tin-carbon composite material of lithium ion battery

Abstract

The invention discloses a preparation method of a tin-carbon composite material of a lithium ion battery. The preparation method comprises the following steps of (1) dissolving benzenediol and formaldehyde in ethyl alcohol, adding a catalyst to have synthesis reaction so as to obtain porous macromolecular phenolic resin, and naturally cooling, drying and pulverizing the porous macromolecular phenolic resin product into powder; (2) adding hydrochloric acid and SnCl3 into deionized water, and stirring the mixture until the SnCl3 is completely dissolved to obtain a tin salt solution; (3) adding the porous macromolecular phenolic resin powder into the tin salt solution according to the mass ratio of 1:2 to 1:4, immersing the porous macromolecular phenolic resin powder for 4h to 8h, stirring and dropwise adding 20% to 25% ammonia aqueous solution to obtain a mixed suspension solution, washing the mixed suspension solution by using gradually, and drying; and (4) igniting the dried mixture to obtain the tin-carbon composite material at the burning temperature of 600 to 700 DEG C. The tin-carbon composite material prepared by adopting the preparation method is simple in process, high in material specific capacity, good in circulating stability and long in service life.

Description

technical field [0001] The invention relates to the field of battery preparation, in particular to a method for preparing a tin-carbon composite material of a lithium ion battery. Background technique [0002] Due to its high energy density and good cycle performance, lithium-ion batteries have been widely used since their commercialization, gradually replacing traditional chemical power sources such as lead-acid batteries. Especially with the increasingly prominent energy and environmental issues, the new energy industry has received more and more attention. At present, the lithium-ion batteries used in production mainly use graphitized carbon as the negative electrode material, but the lithium storage capacity of graphite materials is not high. Sn-carbon composite materials have attracted much attention due to their high theoretical gram capacity (theoretical specific capacity is 990mAh / g), low lithium intercalation potential, and higher stability than other metal-based m...

AI Technical Summary

Problems solved by technology

However, tin-carbon composite materials, like other metal-based materials, have a serious volume effect in the process of deintercalating lithium, which leads to the powdering and falling off of the material during charging and discharging, resulting in capacity attenuation, which not only reduces the efficiency of the battery And cycle performance, and there are serious safety hazards