Disordered spinel LiNi0.5Mn1.5O4 cathode with improved rate performance for lithium-ion batteries

被引：28
作者：
Rosedhi, Nur Diyana [1 ]
Idris, Nurul Hayati [1 ]
Rahman, Md Mokhlesur [2 ]
Din, M. F. Md [3 ]
Wang, Jianli [4 ]
机构：
[1] Univ Malaysia Terengganu, Sch Ocean Engn, Kuala Terengganu 21030, Terengganu, Malaysia
[2] Deakin Univ, Inst Frontier Mat, Waurn Ponds, Vic 3216, Australia
[3] Natl Def Univ Malaysia, Dept Elect & Elect Engn, Fac Engn, Kuala Lumpur 57000, Malaysia
[4] Univ Wollongong NSW, Inst Superconducting & Elect Mat, Wollongong, NSW, Australia
来源：
ELECTROCHIMICA ACTA | 2016年 / 206卷
关键词：
LiNi0.5Mn1.5O4; lithium-ion batteries; cathode materials; glycine; POLYMER PRECURSOR METHOD; SOL-GEL METHOD; ELECTROCHEMICAL PROPERTIES; ANODE MATERIAL; RECHARGEABLE BATTERIES; ASSISTED SYNTHESIS; TEMPERATURE; ELECTRODE; GRAPHENE; STORAGE;
D O I：
10.1016/j.electacta.2016.04.152
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The high voltage LiNi0.5Mn1.5O4 cathode with a disordered spinel structure is synthesized by a glycine-assisted low-temperature reaction follows by a thermal treatment at 750 degrees C, 850 degrees C, and 950 degrees C for 12 h. Glycine is used as a chelating agent for the first time to build required environment for shaping the precursor of LiNi0.5Mn1.5O4 materials. The microstructure and morphology of the LiNi0.5Mn1.5O4 product are characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, Brunauer-Emmett-Teller, and transmission electron microscopy. The sample prepares at 750 degrees C reveals small particles with well-defined crystals as confirmed by electron microscopy. Electrochemical results demonstrate that LiNi0.5Mn1.5O4 electrode anneal at 750 degrees C (compare to other two samples) delivers the highest reversible capacity of 110 mAh g(-1) at 0.2C after 100 cycles with good rate capability. The enhanced electrochemical performance could be attributed to the smaller particle sizes as well as well-defined crystals which provide a directional and shorter diffusion path length for Li+ transportation within the crystals. (c) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：374 / 380
页数：7
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