A kind of preparation method of lithium ion battery sns2/snsb composite negative electrode material

Abstract

The invention relates to a method for preparing an SnS2 / SnSb composite negative-pole material of lithium-ion batteries. The method comprises the following steps: (1) adding SnCl4.5H2O and thioacetamide into a polyethylene glycol solution, carrying out stirring, transferring the mixture into a polytetrafluoroethylene tank, carrying out heat preservation for 15 hours at the temperature of 180 DEG C, repeatedly washing a cooled product with deionized water and ethanol, and carrying out vacuum drying, so as to obtain SnS2 powder; (2) dissolving the SnS2 powder in anhydrous ethanol, adding SnCl2.2H2O and SbCl3, and carrying out stirring, so as to obtain a solution A; (3) preparing a 0.15mol / L NaBH4 solution, carrying out magnetic stirring, and adding the NaBH4 solution into the solution A, so as to obtain a solution B; (4) stirring the solution B for 4 to 8 hours at the temperature of 70 DEG C to 90 DEG C, so as to obtain a solution C; (5) transferring the solution C into a polytetrafluoroethylene tank of a hydrothermal synthesis reactor, carrying out heat preservation for 24 hours at the temperature of 140 DEG C to 160 DEG C, washing the cooled product with deionized water and anhydrous ethanol, and carrying out vacuum drying. The negative-pole material obtained by the method is high in capacity and good in cycle performance and has a potential application prospect in the fields of portable electronic devices, power automobiles and the like.

Description

technical field [0001] The invention relates to the field of lithium ion battery negative electrode materials, in particular to a lithium ion battery SnS 2 / SnSb composite anode material preparation method. SnS 2 That is, tin disulfide, and SnSb is tin-antimony alloy. Background technique [0002] With the development of portable electronic devices and power vehicles, higher challenges are put forward for lithium-ion batteries, which not only require high energy density, but also require good cycle performance. The negative electrode material, as the main body of lithium-ion battery storage, realizes the intercalation and extraction of lithium ions during charge and discharge, and is a key part of the entire battery. At present, the anodes of commercial lithium-ion batteries mainly use various carbon materials. The graphite anode materials with better performance on the market can reach 360mAh / g, and the performance has almost reached the ceiling (the theoretical capacity...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the current negative electrode materials of lithium batteries have the problems of low specific capacity and poor cycle performance and rate performance. A kind of SnS for lithium ion batteries is proposed 2 / SnSb composite anode material preparation method, improve electrode cycle stability, and prepare high-capacity and high-stability lithium-ion battery anode materials, thereby improving the overall performance of power lithium-ion batteries

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