Abstract
A new C@SnO2 composites was prepared when the siraitia grosvenorii residue (note as C material) was used as carbon source and SnCl2 was used as the precursor with a 2:1.63 ratio after series characterization. The N-doped C@SnO2 composites (C@SnO2-N) were prepared by the hydrothermal-doping method when dopamine was used as a nitrogen source to hybrid with C@SnO2 with a 16.67:1 ratio which were obtained from the test results of CV and EIS. C material, C@SnO2, and C@SnO2-N were used as negative electrodes. A simulated lead‑carbon battery was assembled and its electrochemical performance was tested with a battery charge/discharge testing system. The first discharge specific capacity of the three materials are 46.8, 102.0, and 123.9 mAh g−1, respectively. After 200 cycles, the specific capacity retention rate of C@SnO2-N can still reach 74.22%.
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