Spherical silver powder with high specific surface area and preparation method thereof

The invention discloses high-specific-surface spherical silver powder and a preparation method thereof. The method comprises the steps that a silver nitrate solution A, a low-concentration reducing agent solution C and a high-concentration reducing agent solution D are prepared for standby application; adding a certain amount of coupling agent into the silver nitrate solution A, stirring and controlling the temperature to 15-40 DEG C to form a silver-ammonia solution; quickly adding the solution C into the silver-ammonia solution, stirring and controlling the temperature to 15-40 DEG C to form a solution E; the solution D is added into the solution E at the speed of 50 L/min to be subjected to a reduction reaction for 10-20 min, suction filtration is conducted on the solution after the reaction is finished, and a silver powder filter cake is obtained; and the obtained silver powder filter cake is washed and subjected to suction filtration multiple times through deionized water, then the washed silver powder f