processing And Performance of V_2O_5 Xerogel, Aerogel, and Aerogel-Line Mterials as Lithium Intercalation HOsts

摘要

Various forms of vanadium pentoxide, including xerogel, aerogel, and aerogel-like forms, were prepared by sol-gel synthesis and porcessed by novel procedures following synthesis. It was demonstrated that the intrinsic thermodynamics oflithium intercalaton of the ARG and ARG-like materials prepared by solvent exchange processes involving methyl formate are identical, while they are drastically different fom those of the parent XRG, which gives rise to significantly increased specific energies for the MF/ARG or MF/ARG-like as lithium intercalation hosts. ALl three forms are capable of reversibly itnercalating up to four moles of Li~+ ions per mole of V_2O_5 electrochemically and can be cathode candidates for rechargeable lithium batteries. Various processing methods for fabricating ocmposite electrodes with the XRG led to specific capacity in the range of 300 to 350 mAh/g at C_4Li/20 rate, and good cyclability.