The Advanced Energy Materials (AEM-EPES UI) research group devotes the research and development of advanced materials for energy-related applications ranging from the materials for energy generation, energy distribution to energy utilization. The role of advanced materials, particularly nano technology-based materials, are of important to provide clean energy technologies for human life, as shown in Fig.1.
In particular, the research interest of AEM – EPES UI includes the energy storage devices such as rechargeable batteries and super capacitors, display technologies and the insulating materials for high voltage applications.
Rechargeable Batteries (Lithium-Ion Batteries)
Lithium-ion batteries (LIBs) was firstly introduced by a Japanese company, Sony in the early 1990s, based on the use of Li-intercalation compounds. The basic work principle of LIBs is illustrated in Fig. 2. Briefly, during the process of charging, Li+ ions migrate from the positive electrode (cathode) through the electrolyte and separator and intercalate into the negative materials followed by the flow of electrons in the same direction. In opposite during the discharging, the Li+ ions transport through the electrolyte and porous separator from the anode to the cathode accompanied by the driven electron flow from the anode to the cathode through an external circuit.
Our group has been studying several approaches in order to enhance the electrochemical performance of anode and cathode materials of LIB as follows :
- Plasma-polymerized C60 coating on SnO2:F anode materials
- SnO2 coating on LiCoO2 cathode materials for high-voltage LIBs
- C60-coating on three-dimensional LiCoO2 thin film cathode in high-voltage regime
Display Technologies (Transparent Heater)
Transparent conducting heater (TCH) has been receiving much attention in recent years due to their wide applications as defogging windows, heating substrate of displays, heating source of sensors, reaction cells and microchips. TCH is defined as a transparent semiconductor coating material that can generate heat when the electric current passes through the coating material. It is desirable heating element because the accurate and fast temperature control can be obtained through the adjustment of the input supplied DC voltage. To fully understand the mechanism in TCH, we illustrate the TCH system in Fig. 3
The performed studies on TCH materials are shown in Fig. 5 :
- Effects of process parameters on sheet resistance uniformity of flexible substrates
- Effects of fluorine contents on fluorine-doped tin oxide for TCH
- Fluorine-doped tin oxide with metal nanodots for TCH