Published 17 August 2010，Electrochemical properties of  (LLZ) were investigated to reveal its availability as a solid electrolyte for all-solid-state rechargeable batteries with a Li metal anode. After calcination at , a well-sintered LLZ pellet with a garnet-like structure was obtained, and its conductivity was  at room temperature. The cyclic voltammogram of the Li/LLZ/Li cell showed that the dissolution and deposition reactions of lithium occurred reversibly without any reaction with LLZ. This indicates that a Li metal anode can be applied for an LLZ system. A full cell composed of a  configuration was also operated successfully at expected voltage estimated from the redox potential of Li metal and . Simultaneously, an irreversible behavior was observed at the first discharge and charge cycle due to an interfacial problem between  and LLZ. The discharge capacity of the full cell was . These results reveal that LLZ is available for all-solid-state lithium batteries.

Author affiliations

1 Department of Applied Chemistry, Graduate School of Urban Environmental Science, Tokyo Metropolitan University, Tokyo 192-0397, Japan

2 NGK Insulators, Limited, Aichi 467-8530, Japan

Author notes

3 Electrochemical Society Active Member.

4 E-mail: masakoto@tmu.ac.jp

Dates

  1. Received 21 April 2010
  2. Revised 2 July 2010
  3. Published 17 August 2010