Aluminum 1 Battery testing 1 Cathode materials 1 Cathode structure 1 Combustion 1 Combustion method 1 Crystallite size 1 Electrochemical performance 1 Field emission cathodes 1 Field emission microscopes 1 Field emission scanning electron microscopy 1 Lithium compounds 1 Lithium-ion batteries 1 Nickel compounds 1 Phase structure 1 Scanning electron microscopy 1 Self-propagating combustion 1 Semiconductor doping 1 Semiconductor materials 1 Single-phase structure 1 Titanium compounds 1 Undoped material X ray diffraction 1