Liquid-Solid Phase Diagrams of Binary Carbonates for Lithium Batteries

作者：Michael S. Ding, Kang Xu, T. Richard Jow · 发表于：Journal of The Electrochemical Society · 年份：2000 · DOI：10.1149/1.1393419 · 被引用次数：166 · 研究领域：Advanced Battery Materials and Technologies、Carbon dioxide utilization in catalysis、biodegradable polymer synthesis and properties

We present the liquid‐solid phase diagrams that we mapped with a differential scanning calorimeter (DSC) for the following seven binary carbonates: dimethyl carbonate (DMC)‐ethylene carbonate (EC), ethyl methyl carbonate (EMC)‐EC, EMC‐propylene carbonate (PC), EMC‐dimethyl ethylene carbonate (DMEC), EMC‐isobutylene carbonate (iBC), PC‐EC, and EMC‐DMC. Many of these are among the most frequently used solvent systems for making the nonaqueous electrolytes for lithium batteries. The phase diagrams of these carbonate systems are all of the simple eutectic type but with vastly different particular features. Comparison of these phase diagrams shows that to expand the liquid region of a carbonate system toward low temperature, the two components of the system need to have comparable melting temperatutes and compatible molecular structures. These results are consistent with thermodynamic considerations and have significant practical implications. © 2000 The Electrochemical Society. All rights reserved.