Synthesis of layered Li1.2+x[Ni0.25Mn0.75]0.8-xO2 materials (0 ≤ x ≤ 4/55) via a new simple microwave heating method and their electrochemical properties

被引：29

作者：

Peng, Qingwen ^{[2
]}

Tang, Zhiyuan ^{[2
]}

Zhang, Lianqi ^{[1
]}

Li, Xingjiang ^{[1
]}

机构：

[1] Tianjin Inst Power Sources, Natl Key Lab Power Sources, Tianjin 300381, Peoples R China

[2] Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China

来源：

MATERIALS RESEARCH BULLETIN | 2009年 / 44卷 / 11期

关键词：

Layered compounds; Electrochemical measurements; Photoelectron spectroscopy; X-ray diffraction; Electrochemical properties; CATHODE MATERIALS; RAY; MN; DIFFRACTION; ELECTRODES; BEHAVIOR; NI; CO;

D O I：

10.1016/j.materresbull.2009.07.018

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Li1.2+x[Ni0.25Mn0.75](0.8-x)O-2 (0 <= x <= 4/55) was prepared by a new simple microwave heating method and the effect ofextra Li+ content on electrochemistry of Li1.2Ni0.2Mn0.6O2 (x = 0) was firstly revealed. X-ray diffraction identified that they had layered alpha-NaFeO2 structure (space group R-3m). Linear variation of lattice constant as a function of x value supported the formation of solid solution, that is, extra Li+ is possibly incorporated in structure of layered Li1.2Ni0.2Mn0.6O2 (x = 0), accompanying oxidization of Ni2+ to Ni3+ to form Li1.2+x[Ni0.25Mn0.75](0.8-x)O-2 (0 <= x <= 4/55). This was confirmed by X-ray photoelectron spectroscopy that Ni3+ appeared and increased in content with increasing x value. Charge-discharge tests showed that Li1.2+x[Ni0.25Mn0.75](0.8-x)O-2 (0 <= x <= 4/55) truly displayed different electrochemical properties (different initial charge-discharge plots, capacities and cycleability). Li1.2Ni0.2Mn0.6O2 (x = 0) in this work delivered the highest discharge capacity of 219 mAh g(-1) between 4.8 and 2.0 V. Increasing Li content (x value in Li1.2+x[Ni0.25Mn0.75](0.8-x)O-2) reduced charge-discharge capacities, but significantly enhancing cycleability. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：2147 / 2151

页数：5

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