title: Interconnected silicon hollow nanospheres for lithium-ion battery anodes with long cycle life.
abstract: Silicon is a promising candidate for the anode material in lithium-ion batteries due to its high theoretical specific capacity. However, volume changes during cycling cause pulverization and capacity fade, and improving cycle life is a major research challenge. Here, we report a novel interconnected Si hollow nanosphere electrode that is capable of accommodating large volume changes without pulverization during cycling. We achieved the high initial discharge capacity of 2725 mAh g(-1) with less than 8% capacity degradation every hundred cycles for 700 total cycles. Si hollow sphere electrodes also show a Coulombic efficiency of 99.5% in later cycles. Superior rate capability is demonstrated and attributed to fast lithium diffusion in the interconnected Si hollow structure.
authors.affiliation: Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States.
authors.forename: Yan
authors.initials: Y
authors.lastname: Yao
authors.forename: Matthew T
authors.initials: MT
authors.lastname: McDowell
authors.forename: Ill
authors.initials: I
authors.lastname: Ryu
authors.forename: Hui
authors.initials: H
authors.lastname: Wu
authors.forename: Nian
authors.initials: N
authors.lastname: Liu
authors.forename: Liangbing
authors.initials: L
authors.lastname: Hu
authors.forename: William D
authors.initials: WD
authors.lastname: Nix
authors.forename: Yi
authors.initials: Y
authors.lastname: Cui
mesh_terms: D004058:Diffusion; D011211:Electric Power Supplies; D004566:Electrodes; D007477:Ions / Q000737:chemistry; D008094:Lithium / Q000737:chemistry*; D054118:Nanospheres / Q000737:chemistry*; D036103:Nanotechnology; D010316:Particle Size; D012825:Silicon / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D007477:Ions; D008094:Lithium; D012825:Silicon