What is the preparation method for bauxite for lithium battery separators?
Lithium-ion battery separators are thin films with a microporous structure. As a key structural component with many technical barriers in the lithium-ion battery industry, their performance directly affects battery capacity, internal resistance, cycle life, current density, and safety. One of the major safety concerns with lithium-ion batteries is the random internal short-circuiting. To address this safety issue, a thin layer of alumina coating is applied to the separator. A method for preparing alumina ceramic separators for lithium-ion batteries, characterized by using aluminum hydroxide as the raw material, preparing bayerite through hydrothermal reaction, and then calcining it at high temperatures to produce alumina for the separators; the steps include: using aluminum hydroxide as the raw material, ultra-fine aluminum hydroxide as the seed crystal, ammonia water as the additive, and soft water as the reaction medium to prepare hydrotalcite through hydrothermal reaction; calcining the bayerite at high temperatures to obtain α-alumina raw material; and then grinding the α-alumina raw material using a mill, spray drying, or air jet mill to prepare the alumina for the lithium-ion battery separators.
