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首页> 外文期刊>International Journal of Electrochemical Science >TiO2-Modified Spinel Lithium Manganate for Suppressing Mn Ion Dissolution in Lithium Ion Batteries
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TiO2-Modified Spinel Lithium Manganate for Suppressing Mn Ion Dissolution in Lithium Ion Batteries

机译：TiO 2 修饰的尖晶石锰酸锂用于抑制锰离子在锂离子电池中的溶解

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Capacity fading of spinel lithium manganate-based batteries is mainly caused by the dissolution of manganese, which limits their large-scale application. Suppressing the dissolution of manganese is crucial to reduce the capacity decline of lithium manganate-based batteries. Using a sol-gel method, Titanium dioxide (TiO2) was doped into the surface layer of a spinel LiMn2O4 core, X-ray diffraction data showed that the crystal structure after modification was similar to the bulk spinel LiMn2O4, indicating cationic shell LiMn2-xTixO4 was formed. The phase similarity between the pristine and doped layers fully maintained the ionic and electronic transport channels. Meanwhile, the doped surface layer blocked direct contact between LiMn2O4 and the electrolyte, preventing corrosion of LiMn2O4 in the electrolyte. Cycle performance experiments at elevated temperature and high rate fully demonstrated the excellent cyclability of the doped structure as a cathode material, and manganese dissolution test gave direct evidence for the superior effect of the modified cathode in suppressing Mn dissolution.
机译：尖晶石锰酸锂基电池的容量衰减主要是由于锰的溶解引起的，这限制了它们的大规模应用。抑制锰的溶解对于减少锰酸锂基电池的容量下降至关重要。使用溶胶-凝胶法，将二氧化钛（TiO2）掺杂到尖晶石LiMn2O4核的表面层中，X射线衍射数据表明，改性后的晶体结构类似于块状尖晶石LiMn2O4，表明阳离子壳LiMn2-xTixO4成立了。原始层和掺杂层之间的相相似性完全保持了离子和电子传输通道。同时，掺杂的表面层阻止了LiMn2O4与电解质之间的直接接触，从而防止了LiMn2O4在电解质中的腐蚀。在高温和高速率下的循环性能实验充分证明了作为阴极材料的掺杂结构的优异循环性能，锰溶解测试直接证明了改性阴极在抑制Mn溶解方面的优异作用。

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