Metal ions 13 Lithium ion batteries 11 Absorption and adsorption 9 Ion exchange 9 Electric properties 7 Glass 7 Ions 7 Lithium ions 7 Ion bombardment 6 Lithium cells 6 Analysis 5 Hydrogen-ion concentration 5 Storage batteries 5 Dense plasma focus 4 Heavy ions 4 Ion implantation 4 Materials 4 Measurement 4 Polyelectrolytes 4 Secondary ion mass spectrometry 4 Spectra 4 Adsorption 3 Chemical process control 3 Electrochemical analysis 3 Electrodes, Ion selective 3 Electrolytes 3 Heavy ion collisions 3 Heavy metals 3 Ion exchange chromatography 3 Proteins 3