and complex hydrides may act as anode and solid electrolytes in next generation
of lithium batteries. Based on the conversion reaction with lithium to form
LiH, Mg- and Tibased anode materials have been tested in half-cell
configuration with solid electrolytes derived from the hexagonal high
temperature modification of the complex hydride LiBH4.
These anode materials show large first discharge capacities
demonstrating their ability to react with lithium. Reversibility remains more
challenging though possible for a few dozen cycles. The work has been extended
to full-cell configuration by coupling metallic lithium with positive
electrodes such as sulfur or titanium disulfide through complex hydride solid electrolytes.
Beside pure LiBH4 which works only above 120 _C, various strategies like substitution, nanoconfinement and sulfide
addition have allowed to lower the working temperature around 50 _C. In addition, use of lithium closo-boranes has been attempted. These
results break new research ground in the field of solid-state lithium
batteries. Finally, operando and in-situ neutron scattering methods applied
to full-cells are presented as powerful tools to investigate and understand the
reaction mechanisms taking place in working batteries.
- Metallic and complex hydrides