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The synthesis and characterization of were carried out in order to improve the electrochemical properties of for lithium ion batteries. Single phase of ( and in hexagonal setting) was obtained by heating a reaction mixture of , , and at 750°C under an oxygen stream for 20 h and examined in nonaqueous lithium cells. was oxidized to in the voltage range of 3.5–4.8 V. X‐ray diffraction examinations of indicated that the reaction
Ohzuku et al. (Fri,) studied this question.