Understanding the exceptional elevated temperature performance of high voltage LiNi0.5Mn1.5O4 cathodes by LiFePO4 modification

被引：14

作者：

Jang, Won Hee ^{[1
]}

Kim, Min Chul ^{[1
]}

Kim, Shin Ho ^{[1
]}

Aravindan, Vanchiappan ^{[1
,2
]}

Kim, Woo Seong ^{[3
]}

Yoon, Won-Sub ^{[4
]}

Lee, Yun-Sung ^{[1
]}

机构：

[1] Chonnam Natl Univ, Fac Appl Chem Engn, Kwangju 500757, South Korea

[2] Nanyang Technol Univ, Energy Res Inst NTU ERI N, Singapore 637553, Singapore

[3] GS EM Co Ltd, Iksan 570977, South Korea

[4] Sungkyunkwan Univ, Dept Energy Sci, Gyeonggi Do 440746, South Korea

来源：

ELECTROCHIMICA ACTA | 2014年 / 137卷

关键词：

Lithium-ion battery; High voltage spinel; Olivine phosphate coating; Sol-gel; LITHIUM; BATTERIES; STORAGE; SAFETY;

D O I：

10.1016/j.electacta.2014.06.054

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Exceptional elevated temperature performance of high voltage spinel cathodes are realized by LiFePO4 coating in a single-step process at 600 degrees C under Ar flow. First, the single-phase spinel LiNi0.5Mn1.5O4 is prepared via sol-gel route by optimizing the adipic acid concentration (0 - 1 mol.). Then, the high performing spinet phase (0.7 mol. adipic acid treated) is subjected to LiFePO4 modification by conventional two-step coating procedure with various coating concentrations (1-3 wt.%). Single-step LiFePO4 coating procedure also performed at 550 degrees C under Ar atmosphere for the comparison. Although LiFePO4 modified LiNi0.5Mn1.5O4 delivered appreciable performance in elevated temperature (55 degrees C), but it is not sufficient for the practical applications. Therefore, fine tuning of the LiFePO4 (1 wt.%) formation temperature (500-600 degrees C) have been varied to achieve excellent electrochemical profiles at elevated temperature conditions. The presence of thin LiFePO4 have been confirmed by high resolution TEM studies and supported well with EDAX measurements. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：404 / 410

页数：7

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