To overcome MnO2's structural issues, various types of materials have been used, such as mesoporous nanostructures with multiple assemblies. Structures such as hollow carbon spheres (HCS) have been tested due to their high surface-to-volume ratios, encapsulation capability, and outstanding chemical and thermal stability. For MnO2 precisely, nanorods seem to work the best to maintain the ultrahigh-specific capacity while increasing efficiency. The nanorods make the MnO2 highly porous and improve the overall surface area, enabling higher, faster ion conductivity and flow. This is a large reason because 1D systems are the smallest dimension structures for efficient transport of electrons and may give an ideal host material for inserting and extracting ions.