本发明涉及一种基于钼酸盐的硫基复合正极材料及其制备方法，该硫基复合正极材料，由单质硫和作为载体的钼酸盐复合而成，其中，硫在复合正极材料中的质量百分比含量为50%~95%。所述钼酸盐的理论密度>3.5 g cm‑3，振实密度>1.0 g cm‑3。钼酸盐为空心球结构，其制备方法是将乙酰丙酮金属盐M(AA)、乙酰丙酮钼按比例加入到甲醇中室温下搅拌，随后加入HNO3，将得到的溶液置于反应釜中保温处理，所得沉淀用清洗后干燥，干燥好的粉末300~500°C。本发明钼酸盐载体材料能够实现固硫和促进电化学反应进行的作用，继而获得高容量和高稳定性的锂‑硫电池。
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