A method for preparing a negative electrode additive for lithium battery by calcining an organotin compound

The invention discloses a method for preparing a lithium battery negative electrode additive by calcining an organotin compound. The preparation process comprises weighing one of dibutyltin diacetate,tri-n-butyltin fluoride, dioctyltin oxide and dibutyltin maleate for standby; weighing 5 to 15 gram of the material and placing the same in a crucible and put into a muffle furnace for calcination at200 to 500 DEG C for 2 to 4 hours; grinding the calcined material for 20 to 40 minutes to obtain a lithium battery negative electrode material additive; then, weighing and mixing the additive and the graphite according to a mass ratio of 1: (50 to 200), grinding for 20 to 40 minutes to obtain a graphite negative electrode material containing the additive. The additive prepared by the invention can increase the discharge specific capacity of the graphite of the negative electrode material of the lithium battery by about 25%, and still maintains good cycle stability. 本发明公开了种煅烧有机锡化合物制备锂电池负极添加剂的方法。制备过程包括：选取二醋酸二丁基锡、三正丁基氟化锡