Characterization of cathode from LiNixMn2−xO4 nanofibers by electrospinning for Li-ion batteries
Characterization of cathode from LiNixMn2−xO4 nanofibers by electrospinning for Li-ion batteries
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DOI：
10.1039/c5ra21884e
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发表时间：
2015-12
期刊：
影响因子：
3.9
通讯作者：
Hongwei Zhou;X. Ding;Guicheng Liu;Zhan Gao;Guofeng Xu;Xindong Wang
中科院分区：
文献类型：
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作者：
Hongwei Zhou;X. Ding;Guicheng Liu;Zhan Gao;Guofeng Xu;Xindong Wang
采用静电纺丝和溶胶-凝胶相结合的方法制备了Ni取代LiMn2O4纳米纤维正极材料（LiNixMn2−xO4, x = 0.2, 0.3, 0.4, 0.5）。纳米纤维阴极材料具有多孔的“网状”形态，纳米直径为~ 120nm，微尺寸长度为bbb50 μm。该结构提供了短的锂扩散路径和大的表面积，促进快速充放电特性。Ni取代不仅减轻了jann - teller畸变效应，而且极大地抑制了Mn的溶解，提高了速率性能和循环性能。LiNi0.4Mn1.6O4纳米纤维阴极在室温和55℃下均表现出优异的倍率性能和循环性能。因此，LiNi0.4Mn1.6O4纳米纤维有望成为高倍率放电锂离子电池的正极材料。
Ni substituted LiMn2O4 nanofiber cathode materials (LiNixMn2−xO4, x = 0.2, 0.3, 0.4, 0.5) have been prepared by a combination of electrospinning and sol–gel techniques. The nanofiber cathode materials appear to have a porous “network-like” morphology with nanosized diameters of ∼120 nm and microsized lengths of >5 μm. The structure provides short lithium diffusion paths and a large surface area, facilitating rapid charge–discharge characteristics. The Ni substitution not only mitigated the Jahn–Teller distortion effect but also greatly suppressed the Mn dissolution, which improved the rate capability and cycle performance. The LiNi0.4Mn1.6O4 nanofiber cathode exhibits excellent rate capability and cycle performance both at room temperature and at 55 °C. Thus, the LiNi0.4Mn1.6O4 nanofibers may be a potential cathode material for high rate discharge lithium ion batteries.