A Li4Ti5O12–rutile TiO2 nanocomposite with an excellent high rate cycling stability for lithium ion batteries

作者: Xi-Ping Li , Jian Mao

DOI: 10.1039/C5NJ00306G

关键词:

摘要: A lithium titanate (Li4Ti5O12)–rutile titanium dioxide (TiO2) nanocomposite was synthesized using a sol-hydrothermal synthesis method hydroxide monohydrate and titanium(IV) t-butoxide as precursors. The material obtained exhibited micron-sized flower-like morphology (3 μm to 4 μm) consisting of layer-stacked nanosheets. In the composite material, nanosized rutile TiO2 sheets were generated in situ adhered on Li4Ti5O12 sheets. These Li4Ti5O12–rutile play an important role producing numerous Li4Ti5O12/rutile two-phase interfaces which act tiny reaction sites for rapid intercalation extraction, inhibiting side reactions with electrolyte, avoiding aggregation primary nanosheets during long-term cycling process. Benefiting from these unique features, exhibits excellent rate capability (a reversible capacity 148, 146 142 mA h g−1 at 5, 10 20 C, respectively, 1 C = 175 g−1) outstanding stability (only 6.3% loss after 1000 cycles high C).

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