Rate capability

C-rate or another rate label must use a stated capacity basis and protocol. If basis, temperature, cutoffs, or sample state differ, two tests with the same label may not be comparable, so figures need complete annotations.

At higher current, ion movement in electrolyte and pores, electron transport in conductive networks, and interfacial charge transfer can all limit performance. Thicker or more compacted electrodes can also amplify local concentration and temperature differences.

Start-stop, short-duration UPS, and sustained storage demand different pulse and continuous power. Selection should assess usable energy, heat, efficiency, and cycling cost together rather than using one short pulse result as a substitute for sustained operation.