FIGS. 5A-5C illustrate the impact of other example electrolyte compositions on the performance of cells comprising a powder-based high capacity, Si-comprising nanocomposite anode and powder-based intercalation-type cathode (NCM, in this example) and cycled in the voltage range from 2.5 to 4.4 V (it will be appreciated that the cathode potential may approach or exceed about 4.5V vs Li/Li+ in this cell). Cycle stability was studied in several example cells cycled at “C/2” rate at 45° C. Two-to-three (2-3) near-identical cells were constructed and tested for consistency. In these examples, all electrolytes comprise 1M LiPF₆ and 0.2M LiFSI salts, 7 vol. % FEC, 20 vol. % linear carbonate(s), 2 vol. % cyclic carbonate as an ADD solvent, 48 vol. % of the same ester of FIG. 2 (with melting point below ?90° C.) and 23 vol. % of identical non-FEC cyclic carbonate. Electrolyte ELR-A2 comprises 20 vol. % EMC as a linear carbonate component. Electrolyte ELR-S2 comprises 20 vol. % DEC as a linear carbonate component. Electrolyte ELR-T2 comprises 20 vol. % DMC as a linear carbonate component. Electrolyte ELR-U2 comprises 10 vol. % EMC and 10 vol. % DEC as linear carbonate components. Electrolyte ELR-V2 comprises 10 vol. % EMC and 10 vol. % DMC as linear carbonate components. Electrolyte ELR-W2 comprises 10 vol. % DEC and 10 vol. % DMC as linear carbonate components.