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Porous Isomeric Li 2.5 Na 0.5 V 2 (PO 4 ) 3 Wide Voltage Cathode for High‐Performance Lithium‐Ion Batteries Synthesized Through a Colloid Chemical Method
Author(s) -
Wang Yaoyao,
Zhang Xudong,
He Wen,
Yang Wenhao,
Wei Chuanliang
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201900040
Subject(s) - electrochemistry , cathode , monoclinic crystal system , materials science , lithium (medication) , composite number , nanoparticle , ion , porosity , current density , chemical engineering , nanotechnology , analytical chemistry (journal) , crystal structure , chemistry , crystallography , electrode , composite material , organic chemistry , medicine , physics , quantum mechanics , engineering , endocrinology
Abstract The synthesis of highly active and stable cathode materials for lithium‐ion batteries (LIBs) is a major challenge for electrochemical energy storage. Herein, we report an isomeric Li 2.5 Na 0.5 V 2 (PO 4 ) 3 porous nanoparticle composite synthesized through a colloid chemical strategy. This composite is composed of monoclinic Li 3 V 2 (PO 4 ) 3 (M–LVP), rhombohedral Li 3 V 2 (PO 4 ) 3 (R‐LVP) and rhombohedral Na 3 V 2 (PO 4 ) 3 (R‐NVP). Benefiting from the porous structure and synergistic effects between the stable M−LVP and highly conductive R‐LVP, this composite cathode exhibits outstanding electrochemical performance for LIBs. It shows a high discharge capacity of 228.1 mAh g −1 at 0.1 C rate (1 C=150 mA g −1 ) and 108.9 mAh g −1 at 10 C rate in a wide potential range between 1.5 and 4.3 V. Moreover, even in a high current density of 10 C, it still exhibits a stable cycle performance and retains a discharge capacity of 80 mAh g −1 after 500 cycles.