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

共 30 条

[11] Optimization of microwave synthesis of Li[Ni0.4Co0.2Mn0.4]O2 as a positive electrode material for lithium batteries [J].

Lee, Ki-Soo ;

Myung, Seung-Taek ;

Prakash, Jai ;

Yashiro, Hitoshi ;

Sun, Yang-Kook .

ELECTROCHIMICA ACTA, 2008, 53 (07) :3065-3074

[12] Local structure and composition studies of Li1.2Ni0.2Mn0.6O2 by analytical electron microscopy [J].

Lei, C. H. ;

Bareno, J. ;

Wen, J. G. ;

Petrov, I. ;

Kang, S. -H. ;

Abraham, D. P. .

JOURNAL OF POWER SOURCES, 2008, 178 (01) :422-433

[13] Microwave solid-state synthesis of spinel Li4Ti5O12 nanocrystallites as anode material for lithium-ion batteries [J].

Li, Juan ;

Jin, Yong-Li ;

Zhang, Xiao-Gang ;

Yang, Hui .

SOLID STATE IONICS, 2007, 178 (29-30) :1590-1594

[14] Layered cathode materials Li[NixLi(1/3-2x/3)Mn(2/3-x/3)]O2 for lithium-ion batteries [J].

Lu, ZH ;

MacNeil, DD ;

Dahn, JR .

ELECTROCHEMICAL AND SOLID STATE LETTERS, 2001, 4 (11) :A191-A194

[15] Understanding the anomalous capacity of Li/Li[NixLi(1/3-2x/3)Mn(2/3-x/3]O2 cells using in situ X-ray diffraction and electrochemical studies [J].

Lu, ZH ;

Dahn, JR .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2002, 149 (07) :A815-A822

[16] Layered Li[NixCo1-2xMnx]O2 cathode materials for lithium-ion batteries [J].

Lu, ZH ;

MacNeil, DD ;

Dahn, JR .

ELECTROCHEMICAL AND SOLID STATE LETTERS, 2001, 4 (12) :A200-A203

[17] Structure and electrochemistry of Li[NixCo1-2xMnx]O2 (0≤x≤1/2) [J].

MacNeil, DD ;

Lu, Z ;

Dahn, JR .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2002, 149 (10) :A1332-A1336

[18]

Makimura Y., 2003, J POWER SOURCES, V156, P119

[19] Ab initio structure determination of Li2MnO3 from X-ray powder diffraction data [J].

Massarotti, V ;

Bini, M ;

Capsoni, D ;

Altomare, A ;

Moliterni, AGG .

JOURNAL OF APPLIED CRYSTALLOGRAPHY, 1997, 30 :123-127

[20]

Nakayama M, 2003, SOLID STATE IONICS, V164, P35, DOI [10.1016/j.ssi.2003.08.048, 10.1016/j.ssi.2003-08.048]

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