Page 403 - Lindens Handbook of Batteries

14.68 PriMAry BATTerieS

1.0 3
2
0.5 60°C 45°C 1
Discharge current, mA/g 0.05 0°C 20°C 0.5 Discharge current, mA/cm 3
0.2

0.1
0.3
–20°C
0.2
0.1
0.02
0.05
0.01 0.03
10 20 40 60 100 200 400 1000 2000 4000
Hours of service
FIGURE 14.65 Service life of Li/CFx coin-type batteries at various discharge
rates and temperatures; 2.0 V end voltage.

3.5
85°C 45°C 20°C Load: 1 kΩ
3.0

Voltage, V 2.5

2.0
0°C –20°C –40°C
1.5

1.0
0 100 200 300 400 500 600
Duration, h
FIGURE 14.66 Discharge curves for Li/CFx 2/3 A-size cylindrical battery on a 1 kiloohm load at
temperatures from -40 to +85°C.

The average load voltages for 2/3 A-size cylindrical batteries at various temperatures and rates
are given in Fig. 14.67. The performance data are then summarized in Fig. 14.68, which shows the
effect of temperature and load on the service life of a battery normalized to unit weight (grams) and
volume (cubic centimeters).

Shelf Life. The Li/CFx cells have extremely good storage characteristics. Tests over more than
10 years of storage show a self-discharge rate of about 0.5%/yr at 20°C for coin cells and 1.0%/yr
45
for cylindrical batteries. These rates decrease on longer-term storage. This cell is also well-suited
for applications requiring low current drain over an extended period of time. This is illustrated in