The LiBH4-LiI Solid Solution as an Electrolyte in an All-Solid-State Battery

Dadi Þorsteinn Sveinbjörnsson, Ane Sælland Christiansen, Rasmus Viskinde, Poul Norby, Tejs Vegge

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The charge and discharge performance of an all-solid-state lithium battery with the LiBH4-LiI solid solution as an electrolyte is reported. Lithium titanate (Li4Ti5O12) was used as the positive electrode and lithium metal as the negative electrode. The performance of the all-solid-state cell is compared with a cell with an identical electrode setup but a liquid electrolyte (1 M LiPF6 in EC:DMC). All measurements were carried out at a temperature of 60°C. For the all-solid-state cells, 81% of the theoretical discharge capacity is reached for a discharge rate of 10 μA, but a capacity fade of 1.6% per charge-discharge cycle is observed. The electrochemical stability of the LiBH4-LiI solid solution was investigated using cyclic voltammetry and is found to be limited to 3 V. The impedance of the battery cells was measured using impedance spectroscopy. A strong correlation is found between the change in the discharge capacity of the cells and changes in the cell impedance over 200 charge-discharge cycles. This is expectedly due to the possible formation of passivating areas in the cell and/or loss of contact area between the electrolyte and the electrodes.
Original languageEnglish
JournalJournal of the Electrochemical Society
Volume161
Issue number9
Pages (from-to)A1432-A1439
ISSN0013-4651
DOIs
Publication statusPublished - 2014

Keywords

  • Batteries and Energy Storage
  • A

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