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New alloy compositions with improved specific capacity have been defined to reduce the cost of the negative material by decreasing Co content, which is the most expensive component of the electrode. However, corrosion rate is increased in the same way. By modifying the other components' content, tuning metallurgical treatments of the alloy (rapid quenching techniques, optimised annealing temperature), cycling stability and thus cycle life of batteries have been improved.
Prototype evaluation demonstrates that this new alloy allows a 4.6 % capacity gap in commercial AA cells, without having a detrimental effect on cycling stability. Compared to reference alloys, the newly developed one exhibits a similar cycle life.
An electrochemical cell was designed for in situ X-ray measurements of metal hydride alloys. It can be used for the investigation of metal surfaces in contact with an electrolyte solution and during electrochemical processes by grazing incidence X-ray diffraction.
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