| 초록 |
For energy storage technology to go one step further, Li-Sulfur battery is the main key. This battery ensures two to three times higher energy density than previous Li-ion batteries. However, their use was restricted due to some obstacles. The poor electrical conductivity of sulfur, and the lithium polysulfides which comes out as intermediates are the main problems that many researchers are dealing with. Titanium nitride (TiN), one of the polar conductive sulfur hosts, attracts attention as it improves active material utilization and capacity retention for long term cycling. Despite its fascinating features, the low flexibility compared to carbonaceous materials is a task left to be solved. Herein, TiN based freestanding composite electrodes for a relatively higher sulfur loading of 2.5mg/cm2 is investigated. We demonstrated the better electrochemical performance of TiN based electrodes by comparing with 1-D TiO2 based electrodes. Due to endowed conductivity of TiN, it results in better active material utilization and capacity retention compared to TiO2 based electrode. |
