title: Designing new lithium-excess cathode materials from percolation theory: nanohighways in Li(x)Ni(2-4x/3)Sb(x/3)O2.
abstract: Increasing lithium content is shown to be a successful strategy for designing new cathode materials. In layered Li(x)Ni(2-4x/3)Sb(x/3)O2 (x = 1.00-1.15), lithium excess improves both discharge capacity and capacity retention at 1C. Structural studies reveal a complex nanostructure pattern of Li-Sb and Ni-Sb ordering where the interface between these domains forms the correct local configuration for good lithium mobility. The <1 nm Li-Sb stripe domains and their interfaces thereby effectively act as nanohighways for lithium diffusion.
authors.affiliation: Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.
authors.forename: Nancy
authors.initials: N
authors.lastname: Twu
authors.forename: Xin
authors.initials: X
authors.lastname: Li
authors.forename: Alexander
authors.initials: A
authors.lastname: Urban
authors.forename: Mahalingam
authors.initials: M
authors.lastname: Balasubramanian
authors.forename: Jinhyuk
authors.initials: J
authors.lastname: Lee
authors.forename: Lei
authors.initials: L
authors.lastname: Liu
authors.forename: Gerbrand
authors.initials: G
authors.lastname: Ceder
keywords: Cathode; lithium-excess; nano; percolation