title: Enhanced overcharge performance of nano-LiCoO2 by novel Li3VO4 surface coatings.
abstract: LiCoO(2) nanoparticles were coated with 3.4 and 5.5 wt% of lithium vanadate (Li(3)VO(4)) by a wet-chemical and sintering method. When the electrode containing 5.5-wt% Li(3)VO(4)-coated LiCoO(2) was overcharged to 4.5 V at a current of 30 mA g(-1) (∼0.2 C), ∼85% of the initial discharge capacity after 100 charge-discharge cycles was maintained, compared to only ∼67% for the electrode with bare LiCoO(2) nanoparticles. The electrode with 5.5 wt% coating can also deliver 115 mA h g(-1) discharge capacity at a current of 1200 mA g(-1) (∼8 C) and a discharge-charge voltage of 4.5 V, which is twice the capacity of the bare LiCoO(2) sample. The improvement of overcharge cyclability and high-rate capability was believed to be due to the structurally protective Li(3)VO(4) surface coating with good Li-ion conductivity.
authors.affiliation: Materials Science and Engineering Program, Texas A&M University, College Station, Texas 77843, USA.
authors.forename: Xiong
authors.initials: X
authors.lastname: Pu
authors.forename: Choongho
authors.initials: C
authors.lastname: Yu