New covalent salts of the 4+Â V class for Li batteries

► Two Hückel anions with an anodic stability limit of 4.6 V as substitutes of LiPF6. ► Determination by PFG-NMR technique of diffusion coefficients for electrolyte species. ► Electrochemical performance of LiMn2O4 versus Li with a Hückel anion based electrolyte.