Method for preparing chelated boron-based lithium salt by recycling electrolyte from waste lithium ion battery

• Main Authors: ZHAO DONGNI, ZHANG NINGSHUANG, CUI XIAOLING, WANG JIE, DONG HONG, SONG LINHU, LI CHUNLEI, ZHANG JINGJING, LI SHIYOU
• Format: Patent
• Language: Chinese; English
• Published: 06.07.2021
• Subjects: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM; BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; METALLURGY; ORGANIC CHEMISTRY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

A method for preparing a chelated boron-based lithium salt from a waste lithium ion battery recycled electrolyte comprises the following steps: taking the lithium tetrafluoroborate-based waste lithium ion battery recycled electrolyte as a raw material, introducing a certain amount of pretreating agent into the recycled electrolyte, enabling HF and H2O in the recycled electrolyte and the pretreating agent to form a solid-phase product, filtering to obtain a filtrate of recovered electrolyte, adding a silane oxalic acid compound in a preset proportion, stirring at a preset reaction temperature to fully react, filtering again, and carrying out distillation concentration, extraction and recrystallization purification on the filtrate to obtain the chelated boron-based lithium salt product. 由废旧锂离子电池回收电解液制备螯合硼基锂盐的方法，其步骤为：以四氟硼酸锂基废旧锂离子电池回收电解液为原料，通过向回收电解液引入一定量的预处理剂，使回收电解液中的HF和H2O与预处理剂形成固相产物，经过滤得到回收电解液的滤液，再向其中加入预设比例的硅烷草酸化合物，在预设反应温度下，经搅拌充分反应后再次过滤，滤液经蒸馏浓缩、萃取和重结晶提纯，得到螯合硼基锂盐产品。