Abstract
Novel surface modifications with lithium vanadate (Li3VO4) were performed on LiCoO2 nanoparticles that were synthesized by a hydrothermal method. Facile wet coatings followed by high-temperature treatments were utilized to create the lithium vanadate layers. Reaction mechanisms between the surface modifier and LiCoO2 nanoparticles were also systematically investigated. Upon thermal annealing, lithium vanadates often captured Li from LiCoO2. It was found that it is crucial to add extra LiOH not to deteriorate LiCoO2 during the high-temperature treatments. For small weight percentage coatings (5.5 wt%), thin layers of Li3VO4 were found on the surface of LiCoO2; while for high weight percentage coatings (53.1 wt%), thick Li3VO4 shells as well as separate nanostructures were observed.
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