Behaviour of highly crystalline graphites in lithium-ion cells with propylene carbonate containing electrolytes

被引:51
作者
Buqa, H [1 ]
Würsig, A
Goers, A
Hardwick, LJ
Holzapfel, M
Novák, P
Krumeich, F
Spahr, ME
机构
[1] Paul Scherrer Inst, Electrochem Lab, CH-5232 Villigen, Switzerland
[2] Swiss Fed Inst Technol, Inorgan Chem Lab, CH-8093 Zurich, Switzerland
[3] TIMCAL Ltd, CH-6743 Bodio TI, Switzerland
关键词
propylene carbonate electrolyte; graphite exfoliation; graphite negative electrode materials; rechargeable lithium batteries;
D O I
10.1016/j.jpowsour.2005.03.106
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
Several TIMREX (R) synthetic and natural graphite negative electrode materials with different particle size distributions were tested with regard to their compatibility with propylene carbonate used as electrolyte component in lithium-ion cells. The first lithium insertion properties of these graphite materials were characterised in electrochemical lithium half-cells containing I M LiPF6 in ethylene carbonate/propylene carbonate as electrolyte system. Postmortem scanning electron microscopy was applied to study the exfoliation process observed for some of these graphite materials especially with coarser particle sizes. X-ray diffraction, Raman spectroscopy and nitrogen gas adsorption were used to characterise and correlate the material bulk and surface properties of the graphite materials with their electrochemical performance. Differential electrochemical mass spectrometry was applied to study the passivation process of the graphite material surface during the first electrochemical reduction. Non-exfoliating graphite materials indicate the formation of an efficient solid electrolyte interphase, which seems to be kinetically controlled by intrinsic properties of the graphite material bulk and surface. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:134 / 141
页数:8
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