Chemically desodiated thiochromites as cathode materials in secondary lithium cells

✍ Scribed by R. Moshtev; V. Manev; A. Nassalevska; A. Gushev; G. Pistoia

• Book ID: 103898455
• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 512 KB
• Volume: 26
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/0378-7753(89)80136-3

✦ Synopsis

The chemical desodiation of non-doped and vanadium-doped sodium thiochromites has been studied. The changes in the chemical composition and X-ray diffraction patterns during desodiation of the stoichiometric compound reveal that the vanadium-doped thiochromite can be more effectively desodiated. The presence of vanadium in the disulfide layers enhances the covalency of the M-S bond; this probably facilitates a first order phase transition of the vanadium-doped material during deintercalation of both Na+ and Li+. The electrochemical performance of cathodes prepared from the chemically desodiated, vanadium-doped thiochromite is assessed by cycling in a 1 M LiC104/PC + DME solution at a 3 h rate between 1.8 and 3.4 V. The volumetric energy density of the pressed cathodes is 0.51 W h cmB3 at the 100th cycle and drops to 0.35 W h cmm3 after 500 cycles.