Defect‐Controlled Formation of Triclinic Na2CoP2O7 for 4 V Sodium‐Ion Batteries |
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| Authors: | Dr. Heejin Kim Chan Sun Park Prof. Jang Wook Choi Prof. Yousung Jung |
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| Affiliation: | 1. Graduate School of EEWS, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea;2. Suncheon Center, Korea Basic Science Institute, Suncheon, Republic of Korea |
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| Abstract: | 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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| Keywords: | crystal engineering density functional calculations nonstoichiometry polymorphism sodium-ion batteries |
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