Synthesis, Characterization, and Thermal Stability of LiNi1/3Mn1/3Co1/3-zMgzO2, LiNi1/3-zMn1/3Co1/3MgzO2 and LiNi1/3Mn1/3-zCo1/3MgzO2

被引：96

作者：

Luo, Wenbin ^{[1
,2
]}

Zhou, Fu ^{[1
]}

Zhao, Xuemei ^{[1
]}

Lu, Zhonghua ^{[3
]}

Li, Xinhai ^{[2
]}

Dahn, J. R. ^{[1
]}

机构：

[1] Dalhousie Univ, Dept Phys & Atmospher Sci, Halifax, NS B3H 3J5, Canada

[2] Cent S Univ, Sch Met Sci & Engn, Changsha 410083, Hunan, Peoples R China

[3] 3M Co, Ctr 3M, St Paul, MN 55144 USA

来源：

CHEMISTRY OF MATERIALS | 2010年 / 22卷 / 03期

关键词：

CATHODE MATERIALS; LITHIUM; REACTIVITY; LICOO2; ELECTROLYTE;

D O I：

10.1021/cm902593n

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

LiNi1/3Mn1/3Co1/3-zMgzO2, LiNi1/3-zMn1/13Co1/3MgzO2, and LiNi1/3Mn1/3-zCo1/3MgzO2(0 <= 1/3) were prepared from hydroxide precursors. The hydroxide precursors were heated with Li2CO3 at 900 degrees C to prepare the oxides. Rietveld refinements of XRD data show that Mg substitution for Co, Ni and Mn results in different degrees of cation mixing in the Li layer with very little cation mixing in LiNi1/3Mn1/3-zCo1/3MgzO2 and the most cation mixing in LiNi1/3Mn1/3Co1/3-zMgzO2. Electrochemical studies of the LiNi1/3Mn1/3Co1/3-zMgzO2, LiNi1/3-zMn1/3Co1/3MgzO2, and LiNi1/3Mn1/3-zCo1/3MgzO2 (0 <= z < 1/3) samples were used to measure the rate of capacity reduction with Mg content, found to be about -389 (mAh/g)/(z = 1) independent of which cation was substituted by Mg. The impact of Mg substitution on the thermal stability of NMC samples was studied via accelerating rate calorimetry and compared with Al-substituted NMC samples. The substitution of Mg did not improve the thermal stability of the samples, independent of which cation was substituted and independent of the amount of Mg added, in contrast to the effect of A1, which dramatically improves thermal stability.

引用

页码：1164 / 1172

页数：9

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