The invention relates to a
silicon-carbon composite assembled battery. The
silicon-carbon composite assembled battery is prepared by steps: (1) adding
silicon powder into NaOH solution containing various mixtures and being smaller than 30% in
mass ratio, vibrating ultrasonically, filtering and
drying to remove surface impurities and oxides of silicon, wherein the mixtures include carbohydrates, high polymers, silicon
powder and organic solvents in a
mass ratio of 1:1:0.5:5-1:0.1:0.1:0.5; (2) dissolving
citric acid in absolute ethyl
alcohol to obtain
citric acid /
ethanol solution with concentration being 0.4g / ml; adding the silicon
powder processed at the step 1 into the
citric acid /
ethanol solution according to an addition quantity of 2g / ml, ultrasonically stirring for reaction for 30min, and subjecting the
mixed solution to
spray pyrolysis in air at 400 DEG C to obtain the silicon-carbon composite assembled battery. Easiness in
raw material acquisition, low cost and simplicity in preparation are realized, and the prepared silicon-carbon composite is small and controllable in size.