The spinel LiMn₂O₄ was recognized as an appealing candidate cathode material for high rate Li-ion battery, but it suffers from severe capacity fading, especially at a high temperature. In order to solve this problem, we prepared V₂O₅ coated LiMn₂O₄ (LiMn₂O₄@V₂O₅) samples in this work and its structure and morphology were characterized by powder X-ray diffraction, scanning electron microscope, and transmission electron microscope. The LiMn₂O₄@V₂O₅ material delivers an excellent cycling ability and rate capability in lithium batteries, while sustaining a capacity of 75.5 mAh g⁻¹ after 200 cycles at 2 C with a high operating temperature (328 K). This performance are much better than that of LiMn₂O₄ (35.4 mAh g⁻¹) without V₂O₅ coating, the capacity of which faded seriously. These results indicated that the surface modification of V₂O₅, which possess a relative lower operating potential (≤ 3.7 V, Li_xV_2-x/5O₅) compare to the LiMn₂O₄ (∼ 3.9 and 4.1 V), can improve the electrochemical properties of LiMn₂O₄ by endowing a fast lithium diffusion and reasonable electronic conductivity which facilitates the transformation of the electrons and ions. In addition, the acidic and isolated protective layer of V₂O₅ can work as a HF inhibitor and/or HF scavenger and suppress the dissolution of manganese into electrolyte. Thus, we believe that such a LiMn₂O₄@V₂O₅ composite can be an economical and viable candidate cathode material for Li-ion batteries.

尖晶石LiMn ₂ O ₄被公认为是高倍率锂离子电池有吸引力的候选阴极材料，但它的容量急剧下降，尤其是在高温下。为了解决这个问题，我们准备了V ₂ O ₅包覆的LiMn ₂ O ₄（LiMn ₂ O ₄ @V ₂ O ₅）样品，并通过粉末X射线衍射，扫描电子显微镜对其结构和形貌进行了表征。 ，以及透射电子显微镜。LiMn ₂ O ₄ @V ₂ O ₅该材料在锂电池中提供了出色的循环能力和倍率性能，同时在2 C的高工作温度（328 K）下经过200次循环后，可维持75.5 mAh g ^-1的容量。该性能比不具有V ₂ O ₅涂层的LiMn ₂ O ₄（35.4 mAh g ^-1）的性能好得多，LiMn ₂ O ₄的容量严重下降。这些结果表明，与LiMn ₂ O ₄相比，具有相对较低的工作电势（≤3.7 V，Li _x V _{2-x / 5} O ₅）的V ₂ O ₅的表面改性。（约3.9和4.1 V）可通过赋予锂快速扩散和合理的电子传导性（促进电子和离子的转化）来改善LiMn ₂ O ₄的电化学性能。另外，V ₂ O ₅的酸性和隔离的保护层可以用作HF抑制剂和/或HF清除剂，并抑制锰溶解到电解质中。因此，我们认为这种LiMn ₂ O ₄ @V ₂ O ₅复合材料可以是一种经济且可行的锂离子电池正极材料。