Electromechanics
Batteries
Lithium-Ion
ElectromechanicsBatteriesLithium-Ion |
|
As the lightest material Lithium owns the highest electrochemical potential and considers the highest energy density per weight. The aim of using this high energy potential for portable power solutions was the beginning of a new technology era which gets more and more important. As its high capacity of 3.86Ah/g is an advantage for portable products, it has its disadvantages as well:
To use high energy density on a rechargeable basis, battery manufacturers had to search for other chemical compounds and configurations. By using graphite as negative electrode and ionised lithium as a positive counterpart, lithium-ion technology was founded.
Advantages |
Disadvantages |
|
+ nominal capacity = 2 x NiMH |
- all lithium-ion technologies need a protection circuit |
|
+ no need for formatting or periodical care for a long life time |
- aging depend on storage conditions |
|
+ no memory effect |
- damages easy by over(dis)charge |
| Cobalt | Manganese | Phosphate | |
| Safety |
- - |
+ |
++ |
| Cycle life |
+ |
- |
++ |
| Power weight density |
+ |
- |
- |
| Long term cost |
++ |
+ |
- |
| Temperature [°C] |
-20 / +60 |
-20 / +60 |
-45 / +70 |