Aging stability of Li2FeSiO4 polymorphs in LiPF6 containing organic electrolyte for lithium-ion batteries

被引：15
|
作者：
Dippel, Christian [1 ]
Krueger, Steffen [1 ]
Kraft, Vadim [1 ]
Nowak, Sascha [1 ]
Winter, Martin [1 ]
Li, Jie [1 ]
机构：
[1] Univ Munster, Inst Phys Chem, MEET Battery Res Ctr, D-48149 Munster, Germany
来源：
ELECTROCHIMICA ACTA | 2013年 / 105卷
关键词：
Lithium-ion battery; Cathode; Li2FeSiO4; polymorphs; LiFF6 based electrolyte; Aging; CARBONATE; PRODUCTS;
D O I：
10.1016/j.electacta.2013.05.013
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The aging stability of several Li2FeSiO4 (LFS) polymorphs in LiPF6-based organic carbonate solvent electrolyte at elevated temperature was investigated. The different LFS polymorphs were obtained by hydrothermal reaction and subsequent annealing at different temperatures. In addition, a carbon-coated sample was prepared. The samples were aged separately from each other at 60 degrees C in LiPF6-based organic electrolyte for 10 days and analyzed afterwards. The characterization of the residual powder by X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDX) reveals a different aging behavior depending on the structure of the LFS polymorph. This influence of the polymorph on the stability of LFS powder against HF was confirmed by investigations of the aged electrolyte by nuclear magnetic resonance (NMR) spectroscopy and ion chromatography (IC). (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：542 / 546
页数：5
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