Papers by Keyword: Lithium-Ion

Abstract: V2O5 microparticles of 0.3-0.6 μm in diameter were prepared from VO(O-C3H7 i)3 in an ethanol solution by the sol-gel method. The addition of poly(ethylene glycol) and acetyl acetone into the sols was effective to control the size and spherical shape of V2O5 particles. The particles thus obtained were amorphous having a layered structure with hydrated water, and transformed into an orthorhombic phase at 500°C through a glassy state. The microparticles were positively charged in I2-containing acetone, so that they were electrophoretically deposited on the cathode with applied DC voltage. The prepared particles were used as a cathode in an electrochemical cell with a lithium metal as an anode. Discharge capacity of a rechargeable cell of Li / LiPF6 (ethylene carbonate + diethylene carbonate) / V2O5 -based composite was 110-180 mAh g-1 when the potential range and current density were 2-4 V and 0.1 mAcm-2, respectively.

Abstract: Adsorbing and salvaging extremely small quantities of lithium ion, high-performance ion-exchange type lithium ion adsorbent was prepared through the ion-sieve formation method. The method uses acid treatment after the synthesis of spinel-structured nano-Li_1.33Mn_1.67O₄ precursor through the tartaric acid gel process. It has good selectivity and high efficiency in adsorbing lithium ion in seawater. The generated adsorbent showed a 28.2 mg/g lithium uptake from artificial seawater. This adsorbent further showed a difference reproducibility that was lower than 10% when subjected to five cycles of adsorption and desorption experiments.