In the last decades, many researchers were inspired to develop recycling technologies for nanomaterial manufacturing and manage the excessive generation of wastes (biomass, biological, plastic, and industrial wastes). Cost-efficient, sustainable process, and good material properties are the requirements to meet for a successful recycling route and, consequently, inducing huge economic and environmental benefits. Moreover, the use of the recycled nanomaterials for several applications was reported in the literature, such as catalysis, energy storage, and biomedical applications. This chapter will be devoted to reviewing the studies carried on the recycling of nanomaterials for battery applications, mainly alkali metal ion batteries (alkali metal: Li, Na, Mg, K), conventional secondary batteries, and alkaline batteries.