Preperation And Properties Of New Lithium Ion Battery Anode Materials CuCrO₂and Composites

The application of delafossite oxide in both photoelectric and catalytic industrywas equivalent prospective. The copper oxide CuCrO₂, as promising andoe materialof lithium-ion battery, obtained theoretical lithium-intercalating capacity of726mAh·g^-1based on redox mechanism via redox reactions between copper oxideCuCrO₂and four-times Li. In this paper, various characterization methods of XRD,SEM and TEM as well as multiple testing tools of charge-discharge cycles, cyclicvoltammetry and AC impedance were applied to study the feasibility of CuCrO₂asanode material of lithium-ion batteries for the first time.First, the impact of synthetic route to CuCrO₂performance was studied to findthat electrochemical performance of micro-scale particles CuCrO₂prepared bysol-gel method was improved efficiently because of carbon-coating and the capacityretention raised up to296mAh·g^-1from210mAh·g^-1at the1C rate after50cycles.Comparatively, nano-scale CuCrO₂fabricated by hydrothermal synthesis showedgood uniformity and satisfying cycling performance with capacity retention of304mAh·g^-1after50cycles. The electrochemical performance of CuCrO₂was improvedobviously for the sake of adding CNTs to ameliorate CuCrO₂conductivity andconfine volume expansion of CuCrO₂because of first-dimensional tubular structureas well as strength electrode structure stability, all factors above whichcollaboratively dedicated to achieve higher capacity retention of435mAh·g^-1after50cycles.Two different nano-scale composite materials of CuCrO₂/CNTs andCuCrO₂/GNS were prepared by in-situ hydrothermal growth method via thecompound between CuCrO₂and CNTs, GNS respective ly, considering excellentperformances of good conductivity, large specific surface area and excellentmechanical properties of the two above. The results showed that CuCrO₂/CNTs hadrelatively high capacity with up to740mAh·g^-1（0.2C） after70cycles, and cyclingcapacity retention still reached up to530mAh·g^-1with good rate capability andstable electrode structure. Comparatively, the capacity retention of CuCrO₂/GNSreached797mAh·g^-1（0.2C） after40cycles, and capacity deteriorated rapidly withcycles increasing, which still retained to514mAh·g^-1after60cycles, obviouslyhigher than traditional graphite materials or CuCrO₂. The desired electrode materialof good mixture, well-combined complex structure was prepared via adding ofCNTs and GNS, which improved specific capacity, cycling stability andconductivity of electrode material, and then enhanced collaborative ly electrodestability.