过量锂在合成锂离子电池正极材料0.4Li2MnO3•0.6LiNi2/3Mn1/3O2中的作用
he role of excessive lithium in preparation of 0.4Li2MnO3?0.6LiNi2/3Mn1/3O2 cathode material for lithium-ion batteries
本文采用溶胶凝胶法合成了富锂正极材料0.4Li2MnO3?0.6LiNi2/3Mn1/3O2. 通过X射线衍射(XRD),扫描电子显微镜(SEM),傅里叶变换红外光谱(FT-IR)对所得样品的结构、形貌等进行了表征。实验合成的正极材料0.4Li2MnO3?0.6LiNi2/3Mn1/3O2的颗粒尺寸大约在200-500nm。研究发现合成的富锂材料具有碱性。通过材料分析，观察到合成的正极材料0.4Li2MnO3?0.6LiNi2/3Mn1/3O2中存在碳酸锂。分别用不同含量的锂源来合成材料，发现随着锂含量的增加，材料的碱性虽然增强，但是层状材料的晶型结构和电化学性能却得到了改善。
In this paper，lithium-rich layered oxides 0.4Li2MnO3?0.6LiNi2/3Mn1/3O2 material was synthesized via a sol-gel process. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). The particle size of the 0.4Li2MnO3?0.6LiNi2/3Mn1/3O2 materials is about 200-500 nm. The as-obtained material shows an alkaline characteristic. By means of our analyses, it is confirmed that the lithium carbonate is formed generally in the electrode material of 0.4Li2MnO3?0.6LiNi2/3Mn1/3O2. A series of 0.4Li2MnO3?0.6LiNi2/3Mn1/3O2 materials with different lithium contents were synthesized to investigate the alkaline characteristic of the samples. The amount of lithium content used in the preparation affects the order of layer structure, which is correlated to the electrochemical performance of the samples. The use of excessive lithium in preparation of the samples is an effective method to improve the electrochemical performance of 0.4Li2MnO3?0.6LiNi2/3Mn1/3O2 electrode material.
沈临江、顾大伟、李冀蜀、李笑娲
电工材料电化学工业
富锂层状氧化物溶胶凝胶法比容量
lithium-rich layered oxidessol-gel processspecific capacity
沈临江,顾大伟,李冀蜀,李笑娲.过量锂在合成锂离子电池正极材料0.4Li2MnO3•0.6LiNi2/3Mn1/3O2中的作用[EB/OL].(2015-02-15)[2025-08-11].http://www.paper.edu.cn/releasepaper/content/201502-190.点此复制
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