Nickel Chevrel-phase sulfides NiyMo6S8−z and NiyMo6S8−zOn as the cathode of lithium secondary batteries

✍ Scribed by M. Wakihara; H. Ikuta; T. Uchida

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 174 KB
• Volume: 44
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/0378-7753(93)80215-b

✦ Synopsis

As cathode of lithium secondary batteries, some nickel Chevrel-phase sulfides (NMS: NirMo6Sa_z) with nonstoichiometric compositions both in nickel and sulfur were reexamined, and their promising cycling properties at ambient temperature were recognized. The Li/ NMS cells could be galvanostatically discharged up to x=4 (Li~NMS) when the current density was 0.5 mA/cra 2. Also the NMS which partly incorporated oxygen in the cluster structure (NMSO: e.g., Ni2Mo687.500.1) were tested as the cathode of lithium secondary batteries. In a deep cycling test carried out between 1.5 and 2.7 V for NMS and NMSO, more than 50% of the initial discharge capacity was maintained at the 60th cycle. NMSO cathode at the composition NizMo~ST.500.1 showed more excellent discharge/charge cycling properties than those in NMS.