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Description. Cobalt(II) chloride (CoCl 2) is the most common cobalt compound found in laboratories. The dramatic color change of blue-purple Cobalt(II) chloride to a rose color when hydrated makes CoCl 2 an excellent indicator for water in dessicants.
For example, lithium cobalt oxide, one of the most common Li-ion, has the chemical symbols of LiCoO2 and abbreviation LCO. For reason of simplicity, a short form as been assigned to a chemistry which for this battery is Li-cobalt. Cobalt is the main active material that gives this battery character.