The family of 2D transition metals carbides, carbonitrides, and nitrides—communally known as MXenes—have been explored dramatically since Ti3C2 was first discovered in 2011. MXenes’ hydrophilic surfaces are a result of surface functionalities like fluorine, oxygen, or hydroxyls. MXenes’ versatile surface chemistry allows for customization for a variety of applications, like lubrication, photo-, electro-, and chemical catalysis, energy storage, composite reinforcement, shielding against electromagnetic interferences, reinforcements, biosensors, and water purifications. Thus, this chapter provides a thorough discussion of the usage of MXenes and their composites in rechargeable batteries including the evaluation of their efficacy. On the other hand, MXenes suffer from low electrochemical kinetics and capacity degradation due to self-stacking and agglomeration. Therefore, it is crucial to modify MXene using different nanomaterials. Consequently, MXene-based composites can provide more control over the chemical and physical characteristics of MXene because of their surface terminal groups. The current developments in MXene and its composite nanoarchitectures, which were created for various rechargeable batteries to improve electrochemical properties, problems, and scientific solutions, were covered in this chapter.