Pd = E x I (Eq.4) Therefore, the rate capability must be increased by improving both ion and electron transport during the charge/discharge processes. The rate capability depends on both intrinsic (molecular design of the framework) and extrinsic (electrolyte, processing of active material, conductive additives, etc.) factors that need to be optimised to improve the electronic and ionic conductivities. Here we will focus on how to improve intrinsic electronic and ionic conductivities from a molecular design point of view (Fig. ). Extrinsic factors (beyond molecular design) to increase the rate capability will be discussed in the next section.