Herein, a simple method to prepare porous carbon that inhibits hydrogen evolution is used, which has enormous advantages for both capacitors and lead‐acid batteries. The quantitative filter paper spongy porous carbon (SQFPC) is successfully synthesized by the two‐step method. SQFPC displays a porous, spongy structure with a large specific surface area (1847 m2 g−1). In electrochemical tests, SQFPC exhibits high specific capacitance (244 F g−1 at 1 A g−1) and a capacitance retention rate of 72.5% at 40 A g−1. In addition, the capacity of the battery with 0.5 wt% SQFPC is improved by 57.6% at a discharge rate of 0.1C, and the cycle life under the high‐rate partial state of charge is 9.3 times that of the blank battery. The enhanced battery performance is related to the unique structure and surface functional groups of carbon, which speed up ion movement inside the battery and provide active sites for lead deposition.

In this article, different carbon materials (NC, CC) are obtained by burning two kinds of six‐carbon alkane, n‐hexane, and cyclohexane, respectively. They are used as negative electrode additives for lead‐carbon batteries (LCBs) that could considerably improve the performance of LCB cycle life. 0.1 wt% NC (0.1NC) shows the best high rate partial state of charge cycle performance (5350) which is 3.6 times of CC and 1.2 times of commercial conductive carbon black. Furthermore, in the charging acceptance test, the initial instantaneous constant voltage charging receiving current of 0.1NC is 7.81 A, which is increased by 167% compared with 0.1EC (2.92 A). The synergistic effect of high graphitization structure, small specific surface area, and abundant carboxyl functional groups may be the reason for NC's good performance.

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