Hareendrakrishnakumar, Haritha Chulliyote, Reshma Joseph, Mary Gladis Micro- and Nanocrystalline Inverse Spinel LiCoVO<sub>4</sub> for Intercalation Pseudocapacitive Li<sup>+</sup> Storage with Ultrahigh Energy Density and Long-Term Cycling Intercalation pseudocapacitance has been recognized as a new type of charge storage mechanism in crystalline metal oxides, wherein Li<sup>+</sup> intercalation is not limited to surface structures, instead extended to the bulk crystalline framework of the material. This may possibly narrow the performance gap between pseudocapacitors and batteries. Hitherto, very few crystalline materials have been found to exhibit such an intrinsic capacitive property. Here, we report for the first time that the inverse spinel LiCoVO<sub>4</sub> exhibits intercalation pseudocapacitive Li<sup>+</sup> storage property in aqueous electrolyte. Micro- and nanocrystalline LiCoVO<sub>4</sub> were synthesized via conventional solid-state reaction and hydrothermal reaction followed by calcination, respectively. In particular, nanocrystalline LiCoVO<sub>4</sub> demonstrated better Li<sup>+</sup> intercalation benefited from its small crystallite size with highly exposed Li<sup>+</sup> selective crystallographic pathways toward electrolyte. The LiCoVO<sub>4</sub> nanocrystals demonstrated excellent capacitive performance, including high specific capacitance (929.58 F g<sup>–1</sup> at 1 A g<sup>–1</sup>) and cycling stability. Moreover, asymmetric hybrid cells were assembled using nanocrystalline LiCoVO<sub>4</sub> and MWCNT as the positive and negative electrode, respectively. The hybrid cells exhibited an unprecedented energy density (148.75 Wh kg<sup>–1</sup> at a power density of 264.6 W kg<sup>–1</sup>) and superior cycling stability (94% capacitance retention after 5000 cycles). nanocrystalline LiCoVO 4;Ultrahigh Energy Density;Intercalation Pseudocapacitive Li;Long-Term Cycling Intercalation pseudocapacitance;MWCNT;hydrothermal reaction;LiCoVO 4 nanocrystals;crystallite size;spinel LiCoVO 4 exhibits intercalation pseudocapacitive Li;5000 cycles;capacitive property;performance gap;surface structures;metal oxides;storage property;capacitive performance;cycling stability;power density;Nanocrystalline Inverse Spinel LiCoVO 4;charge storage mechanism 2018-01-30
    https://acs.figshare.com/articles/journal_contribution/Micro-_and_Nanocrystalline_Inverse_Spinel_LiCoVO_sub_4_sub_for_Intercalation_Pseudocapacitive_Li_sup_sup_Storage_with_Ultrahigh_Energy_Density_and_Long-Term_Cycling/5866737
10.1021/acsaem.7b00070.s001