Abstract Alignite-based porous carbon was prepared by KOH solution extraction and subsequently by an activation of the extractant with Baoqing lignite as the raw material, and the composite capacitive materials combining the porous carbon with CoNi2S4 were fabricated by a facile hydrothermal method. The effect of different carbon material ratios on the electrochemical performance of lignite-based porous carbon/CoNi2S4 composites was investigated. The results indicate that too high or too low carbon content is not conducive to an improvement in the specific capacitance of the composites, while the lignite-based porous carbon/CoNi2S4 composites with 37% of carbon have higher specific capacitance and better cycling performance. The specific capacitance of the composites is as high as 1318.2 F/g at a current density of 4 A/g, and the capacitance retention is 80.9% after 4000 cycles.

中文翻译：

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褐煤基多孔碳/CoNi2S4复合材料的制备及其电容性能

摘要 以宝庆褐煤为原料，采用KOH溶液萃取、活化萃取剂制备方铅矿基多孔炭，采用简便的水热法制备了多孔炭与CoNi2S4复合电容材料。研究了不同碳材料配比对褐煤基多孔碳/CoNi2S4复合材料电化学性能的影响。结果表明，碳含量过高或过低均不利于复合材料比电容的提高，而含碳量为37%的褐煤基多孔碳/CoNi2S4复合材料具有更高的比电容和更好的循环性能。在电流密度为 4 A/g 时，复合材料的比电容高达 1318.2 F/g，