The invention discloses an SEM-EDS
combined test method for
metal foreign matters in a
lithium battery material and belongs to the field of
lithium ion battery materials. With the method adopted, theproblem of poor detection result accuracy of an existing SEM detection method can be solved. The method comprises the following steps that: high-purity water and a
lithium ion positive
electrode material are added into a test
bottle, a
magnet of which the
magnetic field intensity ranges from 5000GS to 6000GS is put into the test
bottle, and the high-purity water, the lithium
ion positive electrodematerial and the
magnet are uniformly mixed; a
slurry is poured out, the
magnet is taken out, a material adhered to the magnet is washed with the high-purity water, a
beaker with the magnet arrangedtherein is subjected ultrasonic washing with an ultrasonic instrument, the magnet is taken out from the
beaker, is washed and dried; a magnetic
foreign matter on the magnet is adhered to a conductiveadhesive tape; and the form and particle size of the magnetic
foreign matter particles are identified through an SEM, the
chemical composition and type of the
foreign matter particles are determined through
energy spectrum analysis, and magnetic foreign matter content statistics is performed according to the determined type, quantity and particle size of the
metal-containing foreign matter particles. With the method adopted,
trace metal foreign matter particles can be accurately analyzed.