title: Microstructures and electrochemical properties of Si-xTiNi alloys for lithium secondary batteries.
abstract: The rapidly solidified Si-xTiNi (x = 0.2-0.45) alloy ribbons were fabricated via melt spinning process. The thickness of the melt-spun ribbons was about 12.5 microm, and the sound section was selected for the experiment. The microstructures of the ribbons were analyzed using XRD, FE-SEM, and HR-TEM: The primary silicon particles of 30 nm-100 n min diameter were finely dispersed in the inactive buffering matrix of Si7Ni4Ti4 phase. The charge/discharge energy capacity and electrochemical properties were significantly influenced by the relative ratio of NiTi to silicon. With increasing the total amount of Ni and Ti content up to 45 at%, the amount of Si7Ni4Ti4 phase increased and the cycle performance was improved. The Si7Ni4Ti4 phase acted as a buffer for the volume expansion/contraction of Si occurring during the alloying and dealloying, and it could prevent a significant deterioration in cycle performance of the battery.
authors.affiliation: Department of Nano Engineering/Center for Nano Manufacturing, Inje University, Gyeongnam 621-749, Korea.
authors.forename: Hye Jin
authors.initials: HJ
authors.lastname: Kwon
authors.forename: Jong Jin
authors.initials: JJ
authors.lastname: Song
authors.forename: Deuk Kyu
authors.initials: DK
authors.lastname: Ahn
authors.forename: Soon Ho
authors.initials: SH
authors.lastname: Hong
authors.forename: Jong Soo
authors.initials: JS
authors.lastname: Cho
authors.forename: Jeong Tak
authors.initials: JT
authors.lastname: Moon
authors.forename: Keun Yong
authors.initials: KY
authors.lastname: Sohn
authors.forename: Won-Wook
authors.initials: WW
authors.lastname: Park
mesh_terms: D004553:Electric Conductivity; D011211:Electric Power Supplies; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008094:Lithium / Q000737:chemistry*; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D009532:Nickel / Q000737:chemistry*; D010316:Particle Size; D012825:Silicon / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: C040654:titanium nickelide; D009532:Nickel; D008094:Lithium; D014025:Titanium; D012825:Silicon