SEPARATOR-ELECTRODE UNIT FOR LITHIUM-ION BATTERIES, METHOD FOR THE PRODUCTION AND USE THEREOF IN LITHIUM BATTERIES

摘要

The invention relates to separator-electrode units for lithium batteries and to a method for the use thereof, whereby the separator-electrode units comprise a porous electrode which is suitable for use as a positive (cathode) or negative (anode) electrode in a lithium battery and a separator layer applied to said electrode, characterized in that the separator-electrode units have a purely inorganic separator layer comprising at least two fractions of metal oxide particles which are different in terms of average particle size and metal. The separator layer, in particular, contains metal oxide particles having an average particle size (Dg) which is greater than the average pore size (d) of the pores of the positive electrode, which are joined by means of metal oxide particles having an average particle size (Dk) which is smaller than the pores of the porous electrode. One advantage of the inventive separator electrode unit is that it can be produced in a simple manner in the form of a single component and can be made of a greater variety of materials since the step in which the separator is laminated on the electrode can be dispensed with. The inventive separator electrode unit displays excellent mechanical stability and the separator is extremely thin, thereby enabling it to be used in high-power lithium batteries.