Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 28, Pages 8540-8544Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201803511
Keywords
anode materials; sandwich structures; sodium titanate; sodium-ion batteries; ultrathin nanosheets
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Funding
- National Key Research and Development Program of China [2016YFA0202604]
- Natural Science Foundation of China [21606088, 51621001]
- Thousand Talents Program
- Fundamental Research Funds for the Central Universities [2017ZD063]
- Australian Research Council [DE150101234, FL170100154]
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Confined transformation of assembled two-dimensional MXene (titanium carbide) and reduced graphene oxide (rGO) nanosheets was employed to prepare the free-standing films of the integrated ultrathin sodium titanate (NTO)/potassium titanate (KTO) nanosheets sandwiched between graphene layers. The ultrathin Ti-based nanosheets reduce the diffusion distance while rGO layers enhance conductivity. Incorporation of graphene into the titanate films produced efficient binder-free anodes for ion storage. The resulting flexible NTO/rGO and KTO/rGO electrodes exhibited excellent rate performances and long cycling stability characterized by reversible capacities of 72mAhg(-1) at 5Ag(-1) after 10000 cycles and 75mAhg(-1) after 700 cycles at 2Ag(-1) for sodium and potassium ion batteries, respectively. These results demonstrate the superiority of the unique sandwich-type electrodes.
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