ADVANTAGES OF LI-ION BATTERY

Articles: Advantages of Li-Ion Battery

There are many advantages for using Li-Ion Battery compared to using Lead-Acid Battery. A very distinct advantage with the Li-Ion Battery is its size. It is smaller and lighter, which gives you the mobility and portability.

Advantages

  • Higher voltage in Lithium over Lead Acid. (3.7v vs 2.0v)
  • Greater Energy Density per unit. Weight(3x), Volume(6x)
  • Lighter and smaller volume size, offers more portability
  • Higher temperature tolerance (140F vs 80F)
  • No air-conditioning required during operation. (Saving on need for construction of room for air-conditioning as well as utilities)
  • Faster recharge time and more time in between recharges (26 weeks vs maximum 2 weeks for Lead acid)
  • High turnaround charge efficiency (97% vs 75%)
  • More discharge cycles. (2x)
  • Deeper Discharge Tolerance (95% vs 50%). Higher Depth of Discharge
  • Replacement Time-frame (4-7 years for Li-ion, Lead acid 1.5-2yrs)

Disadvantages

  • Li-ion: Protection circuit is custom and expensive
  • Lead Acid: Overall circuitry is commercial off the shelf and inexpensive
  • Li-ion volatility must be closely managed and addressed with safety considerations in design
  • Higher cost per w/hr

 

ENERGY DENSITY LEAD ACID LI-ION (COBALT)
Nominal Cell Voltage 2.0V 3.7V
Voltage Operating Range 1.8 – 2.1V 3.2 – 4.1V
Wh/Kg 35-40 140-150
Size of 1kWh Battery 14 Litres 2.5 Litres
Weight of 1kWh Battery 25kg 6.7kg
Temperature 0K to 25°C (77F) 0K to 60°C (140F)
Life % Remaining at Discharge Temperature 100% at 77F50% at 87F
25% at 97F
12% at 107F
6% at 117F
3% at 127F
0% at 137F (60°C)
100%
100%
100%
100%
100%
100%
Low Temperature (partial functionality) to -40°C to -25°C

 

CHARGING LEAD ACID
LI-ION (COBALT)
Over-Chargeability Tolerant (form H2 gas) Intolerant – Vents
Protection Circuitry Cheap Expensive
Constant Charging 0.07C Rate 10x Faster
Recharging Time 10x the Capacity 1x the Capacity
Recharge Interval Weekly Every 4 – 6 months
Turnaround Charge Efficiency 75% 97%
Temperature Range -40°C to 27°C -20°C to 55°C