Dilatometric Investigations of Graphite Electrodes in Nonaqueous Lithium Battery Electrolytes
Dilatometric Investigations of Graphite Electrodes in Nonaqueous Lithium Battery Electrolytes
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DOI：
10.1149/1.1393548
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发表时间：
2000-07
影响因子：
3.9
通讯作者：
M. Winter;Gerhard H. Wrodnigg;J. Besenhard;W. Biberacher;P. Novák
中科院分区：
文献类型：
--
作者：
M. Winter;Gerhard H. Wrodnigg;J. Besenhard;W. Biberacher;P. Novák
一种相对不常见的技术，称为原位电化学膨胀测量法，可用于记录石墨样品在含阳离子的非水电解质中充电/放电期间的宏观膨胀（扩张）和收缩。已经研究了基于溶剂混合物的几种电解质，例如碳酸亚乙酯/碳酸二甲酯、纯碳酸亚丙酯（PC）和具有额外溶剂（亚硫酸亚乙酯或碳酸亚乙酯）的PC。该膨胀计在纯PC中发生的溶剂化锂嵌入/脱嵌（相对膨胀>100%的量级）和在其它电解质中发生的相应的非溶剂化过程（理论相对膨胀10%的量级）之间产生明显的区别。由于溶剂化锂嵌入导致的石墨剥离可能会破坏石墨样品。电解质渗透到剥离样品的孔或裂缝中也可以通过渗透率测定法监测。因此，电解质测量法提供了关于给定电解质溶液用于以石墨作为负极的可充电锂离子电池的可行性的相关信息。电化学阻抗计的局限性和优点以及该仪器的具体实验特征得到了解决。© 2000电化学学会。All rights reserved.
A relatively uncommon technique known as in situ electrochemical dilatometry can be used to record the macroscopic expansion (dilatation) and contraction of graphite samples during charge/discharge in cation‐containing nonaqueous electrolytes. Several electrolytes based on solvent mixtures such as ethylene carbonate/dimethyl carbonate, pure propylene carbonate (PC), and PC with additional solvents (ethylene sulfite or chlorethylene carbonate) have been investigated. The dilatometer yields a clear distinction between solvated lithium intercalation/deintercalation occuring in pure PC (relative expansion of the order of >100%) and the corresponding unsolvated processes occuring in the other electrolytes (theoretical relative expansion of the order of 10%). Exfoliation of graphite due to solvated lithium intercalation may destroy the graphite sample. The penetration of electrolyte into pores or fissures of the exfoliated sample can also be monitored by dilatometry. Hence, dilatometry provides relevant information concerning the feasibility of a given electrolytic solution for rechargeable lithium‐ion cells with graphite as the negative electrode. Limitations and advantages of the electrochemical dilatometer and specific experimental features of the instrument are addressed. © 2000 The Electrochemical Society. All rights reserved.