DescriptionLog number of publications about electrochemical powersources by year.png
English: The number of patent families (solid lines) and of journal articles (dotted lines) related to fuel cells (all types, green), to flow batteries (blue), to lithium (metal and ion) batteries (red) and to lead-acid batteries (black) vs the earliest priority (for patents) or publication (for journals) year. Also shown as the magenta line is the inflation-adjusted oil price in US$/liter
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The log number of publications about electrochemical powersources by year. Lithium (ion and metal) batteries are shown in red in a log scale. The magenta line is the inflation-adjusted oil price in US$/liter in linear scale.