BaFeO_4 was synthesized by solution reaction between Ba~2+ ion and FeO_4 ion. Li-doped BaFeO_4 was prepared by ball mill solid-state reaction between BaFeO_4 and LiOH. XRD spectroscopy and electrochemical mehtods were used to examien their structures and propertie.s The discharge capacity of barium ferrate was examined at room temperature. The cell was charged (Li released) to 4.5 V and discharged (Li inserted) to 0 V at a constant current of 0.1 mA per 0.01 g BaFeO_4. The curve (Fig.2) shows that barium ferrate working in the high-potential range (3374 to 2618 mV versus Li/Li~+) is not suitable for use as positive-electrode active material in Li-ion batteries because of its discharge capacity low down to 0.475 mAh/g. The curve (Fig.3) shows that barium ferrate working i nthe low-potnetial range (290 to 0 mV versus Li/Li~+) is suitable for use as negative-electrode active material in Li-ion batteries because of its discharge capacity high up to 294 mAh/g.
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机译：通过Ba〜2 +离子与FeO_4离子的溶液反应合成了BaFeO_4。通过BaFeO_4与LiOH之间的球磨机固态反应，制备了掺Li的BaFeO_4。用XRD光谱和电化学方法检测了它们的结构和性质。在室温下检查了高铁酸钡的放电容量。每0.01 g BaFeO_4以0.1 mA的恒定电流将电池充电（释放Li）至4.5 V，并放电（插入Li）至0V。曲线（图2）表明，在高电势范围（相对于Li / Li〜+的3374至2618 mV）下工作的高铁酸钡由于其放电而不适合用作正极活性材料。容量低至0.475 mAh / g。曲线（图3）表明，在低电位范围（相对于Li / Li〜+为290至0 mV）下工作的高铁酸钡因其放电容量而适合用作负极活性材料。最高可达294 mAh / g。
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