The impact of society on the climate of our planet is becoming even clearer, starting from our energy demand, which is in constant growth. This energy used to be generated through fossil fuels. Due to the rise in awareness of the repercussions they have on the whole world, a decarbonized energy generation is evidently needed. Renewables are the medium to achieve this goal, although the main challenges to face are their intermittency and unpredictability. Energy storage plays a critical role in smoothing out their variations, with electrochemical energy storage being the main actor in terms of volumetric and gravimetric energy density.