title: Tissue-like Silicon Nanowires-Based Three-Dimensional Anodes for High-Capacity Lithium Ion Batteries.
abstract: Here, we report on the scalable synthesis and characterization of novel architecture three-dimensional (3D) high-capacity amorphous silicon nanowires (SiNWs)-based anodes with focus on studying their electrochemical degradation mechanisms. We achieved an unprecedented combination of remarkable performance characteristics, high loadings of 3-15 mAh/cm(2), a very low irreversible capacity (10% for the 3-4 mAh/cm(2) anodes), current efficiency greater than 99.5%, cycle stability (both in half cells and a LiFePO4 battery), a total capacity of 457 mAh/cm(2) over 204 cycles and fast charge-discharge rates (up to 2.7C at 20 mA/cm(2)). These SiNWs-based binder-free 3D anodes have been cycled for over 200 cycles, exhibiting a stable cycle life. Notably, it was found that the growth of the continuous SEI layer thickness, and its concomitant increase in resistivity, represents the major reason for the observed capacity loss of the SiNWs-based anodes. Importantly, these NWs-based anodes of novel architecture meet the requirements of lithium batteries for future portable, and electric-vehicle, applications.
authors.affiliation: †School of Chemistry, Faculty of Exact Sciences and ‡Applied Materials Research Center, Tel Aviv University, Tel Aviv, 69978, Israel.
authors.forename: Emanuel
authors.initials: E
authors.lastname: Peled
authors.affiliation: †School of Chemistry, Faculty of Exact Sciences and ‡Applied Materials Research Center, Tel Aviv University, Tel Aviv, 69978, Israel.
authors.forename: Fernando
authors.initials: F
authors.lastname: Patolsky
authors.affiliation: †School of Chemistry, Faculty of Exact Sciences and ‡Applied Materials Research Center, Tel Aviv University, Tel Aviv, 69978, Israel.
authors.forename: Diana
authors.initials: D
authors.lastname: Golodnitsky
authors.affiliation: †School of Chemistry, Faculty of Exact Sciences and ‡Applied Materials Research Center, Tel Aviv University, Tel Aviv, 69978, Israel.
authors.forename: Kathrin
authors.initials: K
authors.lastname: Freedman
authors.affiliation: †School of Chemistry, Faculty of Exact Sciences and ‡Applied Materials Research Center, Tel Aviv University, Tel Aviv, 69978, Israel.
authors.forename: Guy
authors.initials: G
authors.lastname: Davidi
authors.affiliation: †School of Chemistry, Faculty of Exact Sciences and ‡Applied Materials Research Center, Tel Aviv University, Tel Aviv, 69978, Israel.
authors.forename: Dan
authors.initials: D
authors.lastname: Schneier
keywords: Silicon; anode; batteries; composite materials; energy storage; nanowires