The invention belongs to the technical field of
electrolyte preparation of
lithium battery electrolyte and discloses a method for producing
anhydrous lithium perchlorate. The
water content of
anhydrous lithium perchlorate sold in the market is about 3,000ppm, so a factory using the
anhydrous lithium perchlorate needs to remove water from the anhydrous
lithium perchlorate before preparing
electrolyte from the anhydrous
lithium perchlorate. But the water is not completely removed and fluctuation frequently exists, the yield and the quality of the
electrolyte are restricted. At the same time, with the development of lithium batteries, the requirements on the
impurity content and the stability of a pH value of lithium
perchlorate are higher and higher. The method, namely reaction between
lithium hydroxide or
lithium carbonate and
perchloric acid, solves the problems. The method sequentially comprises the following steps of: neutralizing, filtering, evaporating for the first time, cooling for
crystallization, performing
centrifugal separation to obtain a
solid, dissolving, evaporating for the second time, cooling for
crystallization, performing
centrifugal separation to obtain a
solid,melting and evaporating, cooling and crushing, and
drying and packing. The produced anhydrous lithium perchlorate has low
impurity content and the
water content of lower then 200ppm; the pH value of
aqueous solution of the anhydrous lithium perchlorate is stable; and the anhydrous lithium perchlorate can be directly used for producing the electrolyte.