CAJ | 학술논문

以有机气凝胶RC-500为原料,采用低质量比KOH(KOH：有机气凝胶=3：1)活化的方法,900℃炭化活化,制备出一种具有层次孔结构的活性炭气凝胶ACA-500-3。将其作为硫载体,与单质硫在155℃熔融复合后制备出含硫量达66.2%的锂硫电池正极复合材料( ACA-500-3-S)。通过N2吸附、SEM、TEM、XRD和XPS等测试手段考察ACA-500-3和ACA-500-3-S的结构和形貌,并利用循环伏安、恒流充放电和交流阻抗等方法研究ACA-500-3-S的电化学性能。 ACA-500-3-S在0.2 C(1 C=1675 mA·g-1)电流密度下,初始放电比容量高达1287 mAh·g-1,200圈后比容量保持在643 mAh·g -1,并表现出良好的倍率性能,明显优于单质硫电极。
이유궤기응효RC-500위원료,채용저질량비KOH(KOH：유궤기응효=3：1)활화적방법,900℃탄화활화,제비출일충구유층차공결구적활성탄기응효ACA-500-3。장기작위류재체,여단질류재155℃용융복합후제비출함류량체66.2%적리류전지정겁복합재료( ACA-500-3-S)。통과N2흡부、SEM、TEM、XRD화XPS등측시수단고찰ACA-500-3화ACA-500-3-S적결구화형모,병이용순배복안、항류충방전화교류조항등방법연구ACA-500-3-S적전화학성능。 ACA-500-3-S재0.2 C(1 C=1675 mA·g-1)전류밀도하,초시방전비용량고체1287 mAh·g-1,200권후비용량보지재643 mAh·g -1,병표현출량호적배솔성능,명현우우단질류전겁。
An activated carbon aerogel with a hierarchical pore structure was prepared through KOH activation with a KOH/organ-ic aerogel with mass ratio 3:1, followed by carbonization at 900 ℃ for 3 h. The activated carbon aerogel was used as a conductive host of elemental sulfur to prepare a composite by a melt-infiltration method. Nitrogen adsorption, SEM, TEM, XRD and XPS were used to characterize the structure and morphology of the samples before and after the sulfur infiltration. Cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy were used to evaluate the electrochemical performance of the composite as a cathode in lithium ion batteries. It is found that the composite has a sulfur content of up to 66. 2%, a high initial discharge capacity of 1 287 mAh·g-1 at a current density of 0. 2 C and a retained capacity of 643 mAh·g-1 after 200 cycles, which are much higher than those of a sulfur cathode without the carbon host. The composite also exhibits excellent rate capability.