Li2NaV2(PO4)3: A 3.7 V Lithium-Insertion Cathode with the Rhombohedral NASICON Structure

✍ Scribed by Brian L. Cushing; John B. Goodenough

• Book ID: 102610665
• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 396 KB
• Volume: 162
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2001.9213

✦ Synopsis

Li 2 NaV 2 (PO 4 ) 3 has been prepared in the rhombohedral NASI-CON structure via ion exchange from Na 3 V 2 (PO 4 ) 3 . As a lithium-insertion cathode material, Li 2 NaV 2 (PO 4 ) 3 exhibits a speci5c discharge capacity of &96 mAh g ؊1 at a current density of 0.50 mA cm ؊2 with a clear plateau near 3.7 V versus lithium metal. Approximately 10% of the capacity is lost through the 5rst 50 cycles, after which the capacity appears to stabilize. During charge and discharge, the Na ؉ ions tend to remain immobilized in the A(1) site of the NASICON structure, suggesting a direct A(2)PA(2) lithium-transport mechanism.