Abstract
A unique attempt to exploit silicate chemistry for a possible enhancement of the electrochemicalproperties of a lithium ion system via exploration of the novel category lithium intercalatingLiNiSiO4 cathode has been made through the present study. A novel citric acid assistedmodified sol–gel method (CAM sol–gel) has been adopted to synthesizethe title compound with a formation temperature positioned well below500 °C, as derived from thermal studies. A powder x-ray diffraction (PXRD) pattern evidenced theabsence of undesirable peaks and confirmed the formation of a hexagonal lattice structure withenhanced crystallinity and phase purity, and the presence of uniformly distributed particles of∼200 nmsize with well defined grain boundaries is obvious from the scanning electron microscopy (SEM) imageof LiNiSiO4 material. Further, magic angle spinning (MAS)7Li nuclear magnetic resonance (NMR) results fromLiNiSiO4 confirmedthe presence of a layered type of crystal arrangement. A cyclic voltammetry (CV) study performed ona LiNiSiO4 cathode revealed an excellent reversibility without any change in the peak position uponextended cycling, thus substantiating the structural stability upon progressive cycling.
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