New Perspectives in Energy Storage Materials
New Perspectives in Energy Storage Materials
New Perspectives in Energy Storage Materials
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Counts<br />
1200<br />
1100<br />
1000<br />
900<br />
800<br />
700<br />
600<br />
500<br />
400<br />
Orig<strong>in</strong> of spectroscopic “SOC”<br />
475 cm -1<br />
E g<br />
550 cm -1<br />
300 400 500 600 700 800<br />
Raman shift / cm-1<br />
A 1g<br />
Charged NCA cathode (3.77V)<br />
a - NaFeO 2 structure<br />
oxygen<br />
metal<br />
• A1g – oxygen atoms vibrate <strong>in</strong> opposite directions parallel to c-axis<br />
• Eg – oxygen atoms vibrate alternately <strong>in</strong> opposite directions parallel to Li and<br />
transition metal planes.<br />
• SOC proportional to A 1<br />
A 1<br />
/ <br />
475 cm 550cm<br />
a<br />
c<br />
LiMO 2<br />
M = Ni, Co
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