Synthesis of cobalt ferrite with enhanced magnetostriction properties by the sol−gel−hydrothermal route using spent Li-ion battery

The magnetostriction of cobalt ferrites with a spinel structure was successfully prepared using the sol-gel-hydrothermal route using spent Li-ion batteries. On the basis of the aforementioned SEM observation, the formation of a hedgehog-like microsphere structure might involve two important steps: Ostwald ripening and self-assembly.151