An electron energy loss spectroscopy and electron diffraction study of the Pmnb polymorph of Li2MnSiO4

被引：4
作者：
Gummow, R. J. [1 ]
Blackford, M. G. [2 ]
Lumpkin, G. R. [2 ]
He, Y. [1 ]
机构：
[1] James Cook Univ, Sch Engn & Phys Sci, Townsville, Qld 4811, Australia
[2] ANSTO, Inst Mat Engn, Kirrawee, NSW 2232, Australia
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2013年 / 551卷
关键词：
Electron energy loss spectroscopy; Transition metal alloys and compounds; Energy storage materials; Crystal structure; Amorphisation; LITHIUM-ION BATTERIES; CATHODE MATERIALS; ELECTROCHEMICAL PERFORMANCE; LOSS SPECTROMETRY; VALENCE STATES; EELS ANALYSIS; LI2MSIO4; M; MN; FE; SYSTEM;
D O I：
10.1016/j.jallcom.2012.11.013
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：
The Mn valency and the crystallinity of Li2MnSiO4 cathodes (Pmnb form) were examined with electron energy-loss spectroscopy (EELS) and selected area electron diffraction (SAED) both before and after electrochemical lithium extraction. A decrease in the crystallinity of the delithiated charged cathode particles compared to the as-prepared material was observed. The decrease in crystallinity varied from particle to particle. EELS analysis showed that the non-uniform decrease in crystallinity was due to a non-uniform extraction of lithium from the particles. The observed decrease in discharge capacity of the Pmnb polymorph of Li2MnSiO4 with cycling was attributed to the progressive loss of crystallinity and the structural collapse of Li diffusion pathways. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：521 / 526
页数：6
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