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Angewandte Chemie International Edition

Volume 55, Issue 23

June 1, 2016

Pages 6662–6666

 

“Defect-Controlled Formation of Triclinic Na2CoP2O7 for 4 V Sodium-Ion Batteries”

Heejin Kim+, Chan Sun Park+, Jang Wook Choi,* and Yousung Jung*

 

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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