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The lowdown on batteries: Lithium sulphur dioxide

Posted: 18 Aug 2014 ?? ?Print Version ?Bookmark and Share

Keywords:battery? lithium sulphur dioxide? AAA? Teflon? acetonitrile?

Another consideration: Especially after long storage and/or being subjected to low temperatures, the terminal voltage may dip suddenly at the first application of a load and then recover. The effect is similar to lithium-thionyl-chloride chemistries. (See The lowdown on batteries: Lithium thionyl chloride.)

Specific energy: approximately 250 Wh/kg
Energy density: approx. 400 Wh/L
Specific power: 15 W/kg (light loads)
Discharge efficiency: approx. 50-72%
Energy/consumer-price: 0.12 Wh/dollar
Service or shelf life: 10 years
Self-discharge: 0.25%/month
Cycle durability: primary battery/NA
Nominal cell voltage: 2.85 V (3.9 V with bromine monochloride added)
Open-circuit voltage: 3.0 V (varies by manufacturer)
Cut-off voltage: 2.0 V (varies by manufacturer and use)
Temperature: -55 to +70C (selected versions to -60C)

Chemistry
Anode: Li Li+ + e-
Cathode: 2SO2 + e S2O4
Overall: 2Li + 2SO2 Li2S2O4

Usage
Though the military has typically been one of the larger users of this battery type, I think one of the more interesting applications is inside a spacecraft named Huygens that landed on a moon of Saturn called Titan.

The representative illustrations below are for the Saft G 06/2 (0.95AH) battery.

Figure 1: Voltage at mid-discharge versus current and temperature (2.0V cut-off).

Figure 2: Typical discharge profiles at +20C.

Figure 3: Capacity versus current and temperature (continuous discharges, 2.0V cut-off)./i>

In my next column, we'll look at some more tips and tricks, and we will consider another battery technology. In the meantime, as always, I welcome any questions or comments.

About the author
Ivan Cowie is the Chief Engineer at MaxVision.

To download the PDF version of this article, click here.


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