The two-phase battery concept: a new strategy for high performance lithium polymer batteries

被引:9
作者
Prosini, PP [1 ]
Carewska, M [1 ]
Alessandrini, F [1 ]
Passerini, S [1 ]
机构
[1] ENEA, Adv Energy Technol, CR Casaccia, I-00060 Rome, Italy
关键词
PEG; composite cathode; polymer electrolyte; lithium battery;
D O I
10.1016/S0378-7753(01)00653-X
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
A new concept is proposed to realize high performance lithium polymer batteries. The two-phase battery concept is based on the use of two polyethers of different molecular weight. A low molecular weight polyether is used in the composite cathode to assure high ionic conductivity while a high molecular weight polyether is used in the electrolyte formulation. In this work, a composite cathode based on a solid, low molecular weight poly(ethylenglycol) dimethyl ether (PEG-DME, M.W. 2000), was coupled with a solid polymer electrolyte (SPE) based on poly(ethylenoxide) (PEO, M.W. 4 x 10(6)). The electrochemical stability window, evaluated by a slow sweep voltammetry, showed that the system has an anodic breakdown voltage higher than 4.0 V versus Li. The feasibility of two-phase batteries was evaluated by cycling tests. The results indicate that two-phase batteries have enhanced performance with respect to PEO based batteries. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:786 / 789
页数:4
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