低温固相法合成锰酸锂及其储锂性能研究

Fabrication of spinel LiMn_2O_4 through Solid-state Reaction at Low Temperature and Investigation on its Lithium Storage Property

由于尖晶石型锰酸锂具有无污染、能量密度高、成本低且资源丰富等特点,现已发展成为最具潜力的锂离子电池正极材料之一。本文分别以电化学法获得的Mn_3O_4及商业化Mn_3O_4为前驱体,采用低温固相法(700℃)合成了不同尺寸的尖晶石LiMn_2O_4材料。电化学测试表明以电化学法获得的Mn_3O_4为前驱体合成的LiMn_2O_4具有较好的循环性能和倍率性能。100次充放电循环后,该LiMn_2O_4电极的容量保持率达到91.7%。20C倍率下,比容量仍高达98.9 mAh/g。

Spinel lithium manganate is one of the most potential cathode materials for lithium-ion batteries because of the characteristics of non-pollution, high energy density, low cost and abundant resources. Herein, two kinds of LiMn2O4 with different particle sizes are synthesized through low temperature(700 ℃)solid-state reaction using electrochemically-obtained Mn3O4(PS-LiMn2O4) and commercial Mn3O4(NS-LiMn2O4) as the precursors. When utilized as cathode materials for lithium-ion batteries, the PS-LiMn2 O4 shows enhanced cycling stability(the capacity retentionratios after 100 cycles at 1 C is 91.7%) and excellent rate capability(98.9 mAh/g at 20 C).