尖晶石型八面体结构锰酸锂的制备及其电化学性能

采用模板导向法和高温固相法制备尖晶石型八面体结构的LiMn₂O₄锂离子电池正极材料,研究了该材料的结构和电化学性能。 电化学性能研究表明,该电极材料具有良好的循环稳定性和倍率性能,在2.5~4.5 V电压范围,电流密度为100 mA/g时,首周充放电比容量分别为147和179 mA·h/g,循环50周后,其充放电比容量仍分别保持在180/181 mA·h/g。 优良的电化学性能可能归因于尖晶石LiMn₂O₄的形貌结构特征,该方法为制备锂离子电池正极材料提供了思路和依据。

Spinel Lithium Manganese Oxide Octahedral Nanoparticles with Excellent Electrochemical Performance as Cathode Materials for Lithium-Ion Batteries

Spinel LiMn₂O₄ octahedral nanoparticles were prepared by template-directed and high temperature solid-phase methods as cathode materials for lithium-ion batteries. Their structure and electrochemical performances were investigated. The electrochemical performance results show that LiMn₂O₄ as lithium-ion batteries cathode displays excellent cycling stability, rate capability and high specific capacity. The initial charge-discharge specific capacities are 147 mA·h/g and 179 mA·h/g at a current density of 100 mA/g and the voltage of 2.5~4.5 V, respectively. The cathode materials retain reversible charge-discharge capacities of 180 mA·h/g and 181 mA·h/g after 50 cycles, respectively. Excellent electrochemical properties may be attributed to the octahedral LiMn₂O₄ structure. This method is instructive for fabrication and design of excellent electrode materials for lithium ion batteries.