镁锂混合电池正极材料的研究进展

Progress of Cathode Materials for Magnesium-lithium Hybrid-ion Batteries

简单介绍了镁锂混合电池的优势与工作原理,从正极材料与金属离子的反应机理出发,详细综述了嵌入型正极材料和转化型正极材料的研究进展,并对两类材料的反应机理和改性方法进行了总结。其中,嵌入型正极材料以过渡金属硫化物和氧化物为主;转化型正极材料主要是钴基、铜基、铁基以及镍基的金属硫化物。两者相比,嵌入型正极通过Mg2+和Li+的嵌入/脱出过程表现出稳定的循环性能与优异的倍率性能;转化型正极则基于锂转化或镁锂共转化反应展现了更高的放电容量。最后,对镁锂混合电池正极材料的发展进行了总结和展望。

This review introduces the advantages and working mechanisms of magnesium-lithium hybrid-ion batteries(MLHBs).Starting from the reaction mechanisms between cathode materials and metal ions,the research progress of intercalation-type and conversion-type cathode materials is reviewed in detail.The reaction mechanisms and modification methods of the two type materials are summarized.Among them,intercalation-type cathode materials are mainly transition metal sulfides and oxides.Conversion-type cathode materials are mainly cobalt,copper,iron and nickel-based metal sulfides.In comparison,intercalation-type cathode exhibits stable cycling performance and excellent rate capability through the intercalation/extraction process of Mg2+and Li+.Conversion-type cathodes tend to have higher discharge capacities based on Li conversion or Mg-Li co-conversion reactions.Finally,the development of cathode materials for MLHBs are summarized and prospected.