Lithium Iron Disulfide Battery Chemistry

[greg136]

I've been researching Lithium Iron Disulfide Batteries, but I've been unable to find the half-equations for the Cathode and Anode.

Cathode - Iron Disulfide
Anode - Lithium
Electrolyte - Organic Solvent Blend (Propylene Carbonite, Dioxolane, Dimethoxyethane)

The overall equation is,

4Li + FeS(2) --> Fe + 2Li(2)S

Any help would be greatly appreciated.

Thanks in advance.

 

[Borek]

No idea what is exactly happening in these batteries, but just looking at overall equation it is obvious what is getting oxidized and what is getting reduced, so half reactions seem pretty straghtforward.

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methods

 

[greg136]

so half reactions seem pretty straghtforward.

Not for me, I've not done chemistry since GCSE :S

Anyway, this is what I've come up with,

Li --> Li(+) + e-

and

FeS(2) + 4Li(+) + 4e- -- > Fe + 2Li(2)S

How do they look?

Cheers

 

[Borek]

First one - lithium oxidation - is OK. There is a problem with the other one, as you have mixed both half reactions together. You need something like FeS₂ -> Fe + S₂^2-, just balanced with electrons so that charge is identical on both sides.

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[greg136]

Ok, thanks for that.

 

[drandall]

One example from energizer on page 3, although there may be a typo on the sulfer:

http://data.energizer.com/PDFs/lithiuml91l92_appman.pdf