Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 23, Pages 6662-6666Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201601022
Keywords
crystal engineering; density functional calculations; nonstoichiometry; polymorphism; sodium-ion batteries
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Funding
- National Research Foundation - Korea government [NRF-2014R1A4A1003712, NRF-2010-C1AAA001-0029031]
- R&D Convergence Program of the National Research Council of Science Technology [CAP-15-02-KBSI]
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Simple defects such as sodium deficiencies can induce the selective synthesis of triclinic Na2CoP2O7, providing an increase in energy density of more than 40% compared to the stoichiometric polymorph that is preferentially formed under the commonly used synthesis conditions. Such a significant improvement, which was achieved just by changing the crystal structure, suggests that controlling the polymorphism could be an effective and facile method for developing high-performance electrode materials and that defects can play a remarkable role in this process.
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