| 초록 |
Lithium sulfur battery has attracted tremendous attention of global energy industry because of its huge theoretical capacity and energy density. However, continuous capacity decaying with charge and discharge process has inhibited its commercialization. Lithium sulfur battery’s poor cycle stability is caused of elution of lithium polysulfide which is reduced product of sulfur that is active material of lithium sulfur battery. Herein, polythiophene-polyethyleneglycol based cross-linked polymer coated carbon-sulfur composite were prepared for cathode of lithium sulfur battery. In one hand, cross-linked structure coating suppressed sulfur’s expansion during charging/discharging process so that reduced generation of lithium polysulfides. On the other hand, polythiophene and polyethyleneglycol introduced electronic ionic conductivity respectively so that minimized resistance of coating layer. From this strategy, coated carbon-sulfur composite showed enhanced electrochemical performances. |
