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Title: Dual Phase Li 4Ti 5O 12–TiO 2 Nanowire Arrays As Integrated Anodes For High-rate Lithium-ion Batteries

Lithium titanate (Li 4Ti 5O 12) is well known as a zero strain material inherently, which provides excellent long cycle stability as a negative electrode for lithium ion batteries. However, the low specific capacity (175 mA h g -1) limits it to power batteries although the low electrical conductivity is another intrinsic issue need to be solved. In this work, we developed a facile hydrothermal and ion-exchange route to synthesize the self-supported dual-phase Li 4Ti 5O 12–TiO 2 nanowire arrays to further improve its capacity as well as rate capability. The ratio of Li 4Ti 5O 12 to TiO 2 in the dual phase Li 4Ti 5O 12–TiO 2 nanowire is around 2:1. The introduction of TiO 2 into Li 4Ti 5O 12 increases the specific capacity. More importantly, by interface design, it creates a dual-phase nanostructure with high grain boundary density that facilitates both electron and Li ion transport. Compared with phase-pure nanowire Li 4Ti 5O 12 and TiO 2 nanaowire arrays, the dual-phase nanowire electrode yielded superior rate capability (135.5 at 5 C, 129.4 at 10 C, 120.2 at 20 C and 115.5 mA h g -1 at 30 C). In-situ transmission electron microscope clearly shows the nearmore » zero deformation of the dual phase structure, which explains its excellent cycle stability.« less
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Resource Type:
Journal Article
Resource Relation:
Journal Name: Nano Energy, 9:383-391
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org:
Country of Publication:
United States
Environmental Molecular Sciences Laboratory