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Studies On The Electrochemical Performance Of The Lithium Vanadium Oxides By Cation Doping Methods

Posted on:2006-03-08Degree:MasterType:Thesis
Country:ChinaCandidate:H SunFull Text:PDF
GTID:2121360155462264Subject:Inorganic Chemistry
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Layered Li1+xV3O8 is one of the most promising cathode materials in lithium-ion rechargeable batteries because of its low cost and high theoretical capacity. However, previous synthesized methods, e.g., high-temperature sintering method, show obvious disadvantages for as-synthesized samples with low capacity. In this dissertation, we discussed the electrochemical performance of the doped lithium vanadium oxides synthesized by the combined methods of solid-state and microwave calcinations and studied how doping improve the electrochemical performance by employed charge-discharge cycles, XRD, FTIR and SEM techniques.This dissertation tried to improve the electrochemical performance by below process.First, a series of cobalt doped Li1+xV3O8 samples were synthesized by the combined methods of the microwave and solid-state sintering methods. Cobalt doping improves discharge plateau and increase the discharge capacity to 71mAh/g from original 54mAh/g of lithium vanadium oxides without doping in the voltage plateau between 2.20 and 2.44 V.Second, a series of silver doped lithium vanadium oxides were synthesized by optimization of microwave sintering time, solid-state sintering time, doping concentration and sintering temperature. The samples exhibits an initial capacity of 281mAh/g, which is increased 89mAh/g over the initial capacity of lithium vanadium oxides without doping.Third, several nickel doped lithium vanadium oxides were also synthesized and their electrochemical performance was compared with that of silver doped lithium vanadium oxides.
Keywords/Search Tags:lithium-ion batteries, Li1+xV3O8, doped, microwave sintering
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