Structure of Thin film batteries
Encapsulation
Direct connect with battery’s stability
Protection the anode from exterior
Ex) Parlylene, Cr, V
Anode
Desorbs electrons as discharging
Ex) Li, SnO2, C
Electrolyte
High density of charge carrier
High density of vacancy & interstitial site
Low activation Energy of hopping
Cathode
Absorb electrons as discharging
Direct connect w
instrument composition
-Electric furnace
Temperature range:
25°C~1500°C
Heat speed :
Maximum 200°C/min
*Separate Electric furnace and other system like Electronic scale
-Because Electric furnace temperature is very high
so we need to protect other system.
instrument composition
-Electric furnace
Temperature range:
25°C~1500°C
Heat speed :
Maximum 200°C/min
*N
Fundamental structure is same as the general lithium polyer
battery . But some specific functional parts are to be reformed.
Functional improvement
Detailed shap have to be modified by experiment
[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
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.
2.2. 구성요소
구성요소는 크게 전해질, 전극, 이온교환막, 쌍극판, 펌프, 탱크가 있다.
2.2.1. 전해질
각 redox ion couple를 함유한 전해질은 셀 내에 저장되어 있지 않고, 외부의 탱크에 액체 상태로 저장되어 있으며 충•방전 과정 중에 펌프를 통하여 셀 내부로 공급된다. 전해질 용액은 농도와 양의
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