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| Ï뽫Õâ¶ÎÓ¢ÎÄ·Òë³ÉÖÐÎÄ£¬Çë´óÏÀ°ïæ¡£single crystal studies show that the structure of a-LiVOPO4 is a close-packed column of VO octahedra with all interstitial holes alternately filled with Li and P atoms. Whereas in the b-LiVOPO4 the interstitial hole is filled with a P atom and a Li atom is located in between the VO and PO4 coordination polyhedrons surrounded by six oxygen atoms leading to a distorted octahedron. As a result, b-LiVOPO4 structure does not accomplish the steric condition required for facile Li ion transport. Besides this, the high temperature a-LiVOPO4 phase has more open framework with large Li sites in which Li atoms are loosely bound as compared to the metastable b-LiVOPO4 |
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