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Preperation and Properties of New Lithium Ion Battery Anode Materials CuCrO2and Composites

Author: TianJing
Tutor: ZhuXiaoDong
School: Harbin Institute of Technology
Course: Chemical Engineering
Keywords: Lithium ion battery CuCrO2anode CuCrO2/CNTs CuCrO2/GNS Cycle performance
CLC: TM912
Type: Master's thesis
Year: 2012
Downloads: 16
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Abstract


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.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Battery
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