CAJ | 학술논문

为研究S含量对S/AB复合正极材料的性能影响，将单质硫（S）与乙炔黑（AB）分别以3∶1、4∶1和5∶1比例复合，热处理后制得不同的复合正极材料。分别测试单质硫与乙炔黑的组织结构以及电池的交流阻抗谱、循环伏安特性和充放电特性等电化学性能。结果表明，S∶AB=4∶1时，S/AB复合正极材料在0.1 C的放电倍率下首次放电容量最高，达到899.86 mA·h/g，但20次循环后，库仑效率仅为38.45%，说明乙炔黑（AB）的颗粒状结构不能有效防止锂硫电池活性物质的损失。
위연구S함량대S/AB복합정겁재료적성능영향，장단질류（S）여을결흑（AB）분별이3∶1、4∶1화5∶1비례복합，열처리후제득불동적복합정겁재료。분별측시단질류여을결흑적조직결구이급전지적교류조항보、순배복안특성화충방전특성등전화학성능。결과표명，S∶AB=4∶1시，S/AB복합정겁재료재0.1 C적방전배솔하수차방전용량최고，체도899.86 mA·h/g，단20차순배후，고륜효솔부위38.45%，설명을결흑（AB）적과립상결구불능유효방지리류전지활성물질적손실。
To study the influences of sulfur content on properties of S/AB composite cathode materials, we synthesized cathodes of lithium-sulfur batteries by heating sulfur with acetylene black at the ratio of 3∶1, 4∶1 and 5∶1. The structures of sulfur and acetylene black, and the electrochemical properties such as electrochemical impedance spectroscopy, cyclic voltammetry property, and charge and discharge characteristics of the lithium-sulphur battery were tested Results show that when the S/AB ratio is 4∶1, the highest initial discharge capacity of the S/AB composite cathode material reaches 899.86 mA·h/g in the current rate of 0.1 C. However the coulombic efficiency is only 38.45% after 20 cycles. It illustrates that acetylene black of granular structure cannot prevent the loss of substance active substances.