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首页> 外文期刊>Journal of nanoscience and nanotechnology >Electrochemical Studies of Molybdate-Doped LiFePO_4 as a Cathode Material in Li-Ion Batteries
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Electrochemical Studies of Molybdate-Doped LiFePO_4 as a Cathode Material in Li-Ion Batteries

机译：钼酸锂离子电池LiFePO_4的电化学研究

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摘要

The use of molybdate as a new anionic dopant that replaces phosphate in LiFePO_4 was studied. When a small amount of molybdate (0.5 mol%) was used as a dopant, the olivine structure was maintained, while the lattice volume increased by 0.4%. The expanded volume facilitates ionic transfer, because of which the capacity of doped LiFePO_4 at high current discharge rates is higher than that of pure LiFePO_4. The discharge value increased by 25.2% at a charge rate of 5 C when the material was doped with 0.5 mol% molybdate ions. The slight expansion of the lattice volume in the olivine structure facilitates a fast redox reaction by lowering the charge transfer resistance. The current values from cyclic voltammetry indicate that the oxidation (charge) process of the cathode material is more improved than the corresponding reduction (discharge) process. Increasing the level of doping beyond 0.5 mol% had no effect on the results. At some discharge rates, the discharge capacity became worse. Because molybdate is divalent while phosphate is trivalent, a large number of molybdate ions in the lattice can exert considerable stress on the structure.
机译：研究了使用钼酸盐作为新的阴离子掺杂剂替代LiFePO_4中的磷酸盐。当使用少量的钼酸盐（0.5mol％）作为掺杂剂时，保持橄榄石结构，而晶格体积增加0.4％。扩大的体积有利于离子转移，因此，掺杂的LiFePO_4在高电流放电速率下的容量比纯LiFePO_4高。当材料掺杂有0.5 mol％的钼酸根离子时，在5 C的充电速率下，放电值增加了25.2％。橄榄石结构中晶格体积的轻微膨胀通过降低电荷转移电阻而促进了快速的氧化还原反应。循环伏安法的电流值表明，阴极材料的氧化（充电）过程比相应的还原（放电）过程得到了更大的改善。将掺杂水平增加到超过0.5mol％对结果没有影响。在某些放电速率下，放电容量变差。因为钼酸盐是二价而磷酸盐是三价，所以晶格中的大量钼离子会在结构上施加相当大的应力。

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