期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 16, 期 23, 页码 11737-11746出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cp00746h
关键词
-
资金
- Advanced Low Carbon Technology Research and Development Program (ALCA) of the Japan Science and Technology Agency (JST)
- Technology Research Grant Program of the New Energy and Industrial Technology Development Organization (NEDO) of Japan
- MEXT program Elements Strategy Initiative to Form Core Research Center'', Ministry of Education Culture, Sports, Science and Technology (MEXT) of Japan
The physicochemical properties of pentaglyme (G5) and sodium bis(trifluoromethanesulfonyl)amide (Na[TFSA]) binary mixtures were investigated with respect to salt concentration and temperature. The density, viscosity, ionic conductivity, self-diffusion coefficient, and oxidative stability of a series of binary mixtures were measured, and the mixtures were examined as electrolytes for Na secondary batteries. An equimolar mixture of G5 and Na[TFSA] formed a low melting solvate, [Na(G5)(1)][TFSA], which exhibited an ionic conductivity of 0.61 mS cm(-1) at 30 degrees C. The ionicity (Lambda(imp)/Lambda(ideal)) of the glyme-Na[TFSA] mixture was estimated from the molar conductivity of electrochemical impedance measurements (Lambda(imp)) and the Walden plot (Lambda(ideal)). [Na(G5)(1)][TFSA] possessed a high ionicity of 0.63 at 30 degrees C, suggesting that [Na(G5)(1)][TFSA] is highly dissociated into a [Na(G5)(1)](+) cation and a [TFSA](-) anion, regardless of the extreme salt concentration in the liquid. The oxidative stabilities of G5-Na[TFSA] mixtures were investigated by linear sweep voltammetry, and the higher concentration resulted in higher oxidative stability due to the lowering of the HOMO energy level of G5 by complexation with the Na+ ion. In addition, battery tests were performed using the mixtures as electrolytes. The [Na|[Na(G5)(1)][TFSA]vertical bar Na0.44MnO2] cell showed good charge-discharge cycle stability, with a discharge capacity of ca. 100 mA h g(-1), while the [Na(G5)(1.25)][TFSA] system, containing excess G5, showed poor stability.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据