Porous LiMn2O4 nanorods with durable high-rate capability for rechargeable Li-ion batteries
Porous LiMn2O4 nanorods with durable high-rate capability for rechargeable Li-ion batteries
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用于可充电锂离子电池的具有持久高倍率性能的多孔 LiMn2O4 纳米棒
DOI：
10.1039/c1ee01795k
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发表时间：
2011-09-01
影响因子：
32.5
通讯作者：
Chen, Jun
中科院分区：
文献类型：
--
作者：
Cheng, Fangyi;Wang, Hongbo;Chen, Jun
本文主要研究了多孔LiMn 2 O 4纳米棒的制备及其在锂离子电池正极材料中的应用。MnC 2 O 4前驱体的热分解导致多孔Mn 2 O3纳米棒的固态锂化，导致形成具有高结晶度和相纯度的多孔LiMn 2 O 4纳米棒。未经表面改性，合成的多孔纳米棒表现出上级的高倍率性能和循环性能的对应无孔纳米棒和纳米粒子。在10 C倍率下可以提供105 mAh g-1的初始放电容量，并且在该高倍率下500次循环后获得约90%的容量保持率。持久的高倍率性能归因于独特的多孔一维（1D）纳米结构，其产生了快速的锂嵌入动力学和尖晶石电极的良好结构稳定性。一维多孔纳米结构的有益收获可能会启发新的高功率应用的尖晶石基电极的设计和构建。
In this paper, we demonstrated the preparation and application of porous LiMn2O4 nanorods as cathode materials for rechargeable lithium-ion batteries. Solid-state lithiation of porous Mn2O3 nanorods, resulting from thermal decomposition of MnC2O4 precursor, led to the formation of porous LiMn2O4 nanorods with high crystallinity and phase purity. Without surface modification, the as-synthesized porous nanorods exhibited superior high-rate capability and cyclability to the counterpart nonporous nanorods and nanoparticles. An initial discharge capacity of 105 mAh g−1 could be delivered at 10 C rate, and capacity retention of about 90% was obtained after 500 cycles at this high rate. The durable high-rate capability was attributed to the unique porous one-dimensional (1D) nanostructure that gave rise to fast Li-intercalation kinetics and good structural stability for the spinel electrodes. The beneficial gains from 1D porous nanoarchitecture may enlighten the design and construction of new spinel-based electrode for high power applications.