The influence of filler morphology on the crystallization behaviors, thermal stability and strain-sensing behaviors of PLA nanocomposites was revealed.
Polypyrrole coated Fe3O4 nanoparticles have effectively enhanced the EMI shielding of epoxy nanocomposites compared with the physically mixed nanofillers.
Cobalt
(Co) and lithium (Li), rare and valuable elements, are mainly
used to prepare lithium cobalt oxide (LiCoO2) for applications
in lithium-ion batteries (LIBs). Developing an effective method to
recover Co and Li from the waste LIBs is of great significance. In
the present study, Co and Li were extracted from pure LiCoO2 powders and the extracted cathode materials powders from the waste
LIBs after acid dissolution via a mechanochemical reduction process
with iron powders. For pure LiCoO2 powders, the effects
of Fe to LiCoO2 mass ratio, rotation speed, and mechanochemical
reduction time were examined. These parameters influenced positively
the extraction of Co, while they showed negligible effects on the
leaching of Li. The X-ray diffraction (XRD) and scanning electron
microscope (SEM) analyses indicated a promoted extraction of Li arising
from the reduction of particle sizes, magnification of specific surface
area, and change of the crystal structure of particles. For high-efficiency
leaching of Co by the mechanochemical reduction process with iron
powders, X-ray photoelectron spectroscopy (XPS) analysis indicated
the changes in the valence state of Co. The actual cathode materials
disassembled from the wasted LIBs pretreated by this novel mechanochemical
reduction process were also explored. The results indicated that the
leaching ratios of Li, Co, Mn, and Ni could reach 77.15%, 91.25%,
100%, and 99.9%, respectively. This novel mechanochemical process
would be of great importance for the recovery of valuable metals from
waste LIBs.
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