期刊
NANO ENERGY
卷 36, 期 -, 页码 46-57出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2017.04.020
关键词
Li4Ti5O12/graphene; Atomic layer deposition; Seeded route; Anode; Lithium ion capacitor
类别
资金
- National Natural Science Foundation of China [51502073]
- Natural Science Foundation of Tianjin, China [15JCYBJC53200]
- Hebei Province Education Department Science and Technology Research Project [QN2015208]
- US National Science Foundation [DMR 1151028]
- National Natural Science Foundation of China (NSFC) [51201148, U1530402, 21403188]
- Thousand Youth Talents Plan
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1151028] Funding Source: National Science Foundation
High performance composite of nanosized Li4Ti5O12 (LTO) and graphene nanosheets was fabricated using a novel atomic layer deposition (ALD) seeded process incorporated with hydrothermal lithiation for the first time. TiO2 nanoislands as seeds were anchored on graphene by ALD process, triggering the unique structure formation of subsequent LTO. The synergistic effects of nanosized LTO and graphene endow the composite with a short lithium ion diffusion path and efficiently conductive network for electron and ion transport, boosting the excellent reversible capacity, rate capability, and cyclic stability as anode materials for lithium ion capacitors (LICs). The reversible capacity of 120.8 mA h g(-1) at an extremely high current rate of 100 C was achieved successfully, and the electrode can be charged/discharged to about 70% of the theoretical capacity of LTO in 25 s. Meanwhile, the composite exhibited excellent cyclic stability of 90% capacity retention at 20 C with nearly 100% Coulombic efficiency after 2500 cycles. The sintering treatment after hydrothermal reaction has significant effects on the crystallinity, defect density, microstructure and electrochemical property of the composite, which is also supported by theoretical calculations. The results provide a versatile roadmap for synthesis of high performance LTO based composite and new insights into LICs.
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