H3PO4/NaHCO3联合活化制备铅炭超级电池用活性炭

Activated carbon for Pb-C batteries prepared under co-activation with H3PO4 and NaHCO3

对一商用活性炭依次使用H3PO4和NaHCO3联合活化制备适用于铅炭超级电池用活性炭材料,该材料在较浓硫酸体系下具有较高的比电容较和良好的稳定性.利用SEM、XRD和FTIR分别对活性炭表面形貌、微晶结构和表面官能团结构进行分析,通过循环伏安、恒流充放电等方法研究活性炭的电化学性能.结果表明,经过联合活化的活性炭在1.0A/g电流密度、4.8mol/L硫酸溶液条件下稳定放电电容高达224.9F/g,比电容保持率达到86.5％.将联合活化制得的活性炭添加到铅酸电池负极中,其在高倍率部分荷电状态下循环性能有明显提高.

Activated carbon for Pb-C batteries was prepared from a commercial activated carbon via co-activation with H3PO4 and NaHCO3 as activation agents successively.Higher specific capacitance and more stable activated carbon in concentrated sulfuric are achieved.Its surface morphology,crystalline structure and surface functional group structure were characterized by scanning electron micro-scope （SEM）,X-ray diffraction（XRD） and Fourier Transform infrared spectroscopy （FTIR）.The electrochemical characteristics of activated carbon were evaluated by cyclic voltammetry、galvanostatic charge-discharge.Experiment results indicate that during the activation process with H3PO4 and NaHCO3,the modified activated carbon has excellent charge-discharge performance in 4.8 mol/L sulfuric,exhibit a high stable discharge capacitance of 201.9F/g at a current density of 1A / g and the retention rate of specific capacity reaches up to 86.5%.Activated carbon from co-activation was applied to the negative plates of Lead-acid batteries,and better cycle performance of ultrabattery under HRPSoC is achieved.