MANUFACTURING METHOD FOR LITHIUM DIFLUOROPHOSPHATE POWDER AND LITHIUM DIFLUOROPHOSPHATE

• Main Authors: NAKAHARA KEITA, NISHIMURA NATSUYA, IKEDA YUTA, MORINAKA TAKAYOSHI
• Format: Patent
• Language: English; Korean
• Published: 07.07.2017
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

디플루오로인산 리튬 용액으로부터, 디플루오로인산 리튬 분체를 회수할 수 있는 제조 방법을 제공한다. 주용매에 디플루오로인산 리튬이 용해된 용액에, 빈용매를 첨가하여, 고체상의 디플루오로인산 리튬을 석출시키는 공정과, 상기 고체상의 디플루오로인산 리튬을, 상기 주용매 및 상기 빈용매를 포함하는 액체로 고액분리하여, 디플루오로인산 리튬 분체를 얻는 공정을 포함하고, 상기 주용매의 옥탄올/물 분배 계수(P)와, 상기 빈용매의 옥탄올/물 분배 계수(P)와의 관계식이, 이하의 식 (1)과 같은 것을 특징으로 하는 디플루오로인산 리튬 분체의 제조 방법을 이용한다. P≥-4/3×P+1.2 ... (1) [Problem] To provide a manufacturing method with which lithium difluorophosphate powder can be recovered from a lithium difluorophosphate solution. [Solution] A method for manufacturing lithium difluorophosphate powder is used which includes the steps of precipitating solid lithium difluorophosphate by adding a poor solvent to a solution in which lithium difluorophosphate is dissolved in a main solvent, and obtaining lithium difluorophosphate powder by solid-liquid separation of the solid lithium difluorophosphate from the liquid containing the main solvent and the poor solvent, wherein the relational expression between the octanol/water partition coefficient P P of the main solvent and the octanol/water partition coefficient P A of the poor solvent is defined by the following formula (1). P A ‰¥ ˆ’ 4 / 3 × P P + 1.2