Lithium-ion batteries are constituted of many harmful components; the presence of these components in the environment may negatively affect human health. The application of innovations in Li-ion batteries recycling technologies, contributes to the protection of humans and the complete environment in a significant degree. However, the hazard from explosions or toxic matter emissions cannot be excluded even in the case of the application of modern technologies. In terms of recognizing the potential hazards, this paper describes possible toxic effects of the most important components of Li-ion batteries, with special accent on used electrolytes. Also, in terms of improving the employee's safety, this paper suggests certain protective measures during the recycling procedures.