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Herein, thermal decomposition experiments of lithium peroxide (Li 2 O 2 ) were performed to prepare a precursor (Li 2 O) for sacrificing cathode material, Li 2 NiO 2 . The Li 2 O 2 was prepared by a hydrometallurgical reaction between LiOH·H 2 O and H 2 O 2 . The overall reaction during annealing was found to involve the following three steps: (1) dehydration of LiOH·H 2 O, (2) decomposition of Li 2 O 2 , and (3) pyrolysis of the remaining anhydrous LiOH. This stepwise reaction was elucidated by thermal gravimetric and quantitative X-ray diffraction analyses. Furthermore, over-lithiated lithium nickel oxide (Li 2 NiO 2 ) using our lithium precursor was synthesized, which exhibited a larger yield of 90.9% and higher irreversible capacity of 261 to 265 mAh g -1 than the sample prepared by commercially purchased Li 2 O (45.6% and 177 to 185 mAh g -1 , respectively) due to optimal powder preparation conditions.

Thermal Decomposition Study on Li2O2 for Li2NiO2 Synthesis as a Sacrificing Positive Additive of Lithium-Ion Batteries