[Anode material]
The potential that is close the standard electrode potential of Li.
High energy density per volume & weight
Excellent cycle stability (Coulomb effeciency)
Have to endure rapid charging or discharging
Stability
.
.
.
[High Voltage]
[Pollution-Free]
[long cycle life]
[No Memory Effect]
[Safer than Lithium ion battery]
[lower internal resistivity]
[advantageous
lithium ions storage.
Prevent the graphite anode from expanding by lithium ion intercalation
Si has theoretical capacity of 4200mAh/g
Due to it’s large volume change, pulverization can be occurred.
Silicon has high-capacity but poor cycle stability
Carbon has low-capacity but good cycle stability
So silicon/carbon composites can have higher capacity than single carbon anode
Metal
Ex)Al, Cu.
Substrate
Power of Si device → Si
Ex) Si, Glass, Polymer
cf) Polymer substrate → Flexible
Recent R&D Trend
New component materials
Anode : Stability, Reversibility, Low expansion rate
High Melting Temp. of Li(180.6℃) are
needed
Electrolyte : Patent on LiPON
→Need Alternative Materials
Cathode : Direct connect with capacity
Metal & Substrate
내부의 미세한 층 사이에서 빛을 생성하여 밖으로 방출하여야 하는 것이 LED의 목적이라는 점을 생각해보면, 구성 layer중 가장 두꺼운 부분을 차지하는 substrate층의 선택은 LED 자체의 성능을 좌우한다 하여도 과언이 아닐 것이다. 기존의 반도체들이 불투명 결정상의 Si Wafer 을 사용하는
Experimental Setup
Three electrode cell Working electrode : Composite electrode
active material + conducting material + binder
LiCoO2
carbon PVDF
Counter electrode & reference electrode : lithium foil
Electrolyte : Li salt IN non-aqueous solvent
Li salt : LiPF6, LiBF4, LiClO4…
Solvent : EC, PC, DMC, DME…
Lab. of Energy Conversion & STORAGE Materials
Fig.