![]() Titanium disulfide was expensive (~$1,000 per kilogram in the 1970s) and difficult to work with, since it has to be synthesized under completely oxygen and moisture-free conditions. Drawing on previous research from his time at Stanford University, he used a layered titanium(IV) sulfide as cathode and lithium metal as anode. ![]() Stanley Whittingham, then a researcher at ExxonMobil, first reported a charge-discharge cycling with a lithium metal battery (a precursor to modern lithium-ion batteries) in the 1970s.
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