Electrolyte solutions with a wide electrochemical window for recharge magnesium batteries
Electrolyte solutions with a wide electrochemical window for recharge magnesium batteries
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DOI：
10.1149/1.2806175
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发表时间：
2008-01-01
影响因子：
3.9
通讯作者：
Aurbach, Doron
中科院分区：
文献类型：
--
作者：
Mizrahi, Oren;Amir, Nir;Aurbach, Doron
以苯基氯化镁（PhMgCl）刘易斯碱和AlCl 3刘易斯酸在醚中的反应产物为基础，研制了可充镁电池电解液。这些配体的transmetabolites形成的解决方案与MgxCly+和AlCl 4-nPhn-离子作为主要的离子物种，分析通过多核核磁共振光谱。（PhMgCl）（2）-AlCl 3的四氢呋喃（THF）溶液表现出最佳性能：高度可逆的Mg沉积（100%循环效率），过压低：< 0.2 V和电化学窗口宽于3 V。对于这些溶液，在-10至30 ℃之间可以测量到2-5 × 10（-3）Ω（-1）cm（-1）的比电导率，类似于Li电池的标准电解质溶液。在这些溶液中，Mg离子可逆地嵌入Chevrel相（MgxMo 6S 8）阴极。这些系统具有很高的热稳定性。该解决方案可以使得能够使用高电压、高容量Mg插入材料作为阴极，并且因此打开了研究和开发高能量密度、可再充电Mg电池的大门。(c)2007年电化学学会。
Electrolyte solutions for rechargeable Mg batteries were developed, based on reaction products of phenyl magnesium chloride (PhMgCl) Lewis base and AlCl3 Lewis acid in ethers. The transmetallation of these ligands forms solutions with MgxCly+ and AlCl4-nPhn- ions as the major ionic species, as analyzed by multinuclei nuclear magnetic resonance spectroscopy. Tetrahydrofuran (THF) solutions of (PhMgCl)(2)-AlCl3 exhibit optimal properties: highly reversible Mg deposition (100% cycling efficiency) with low overvoltage: < 0.2 V and electrochemical windows wider than 3 V. A specific conductivity of 2-5 X 10(-3) Omega(-1) cm(-1) could be measured between -10 and 30 degrees C for these solutions, similar to that of standard electrolyte solutions for Li batteries. Mg ions intercalate reversibly with Chevrel phase (MgxMo6S8) cathodes in these solutions. These systems exhibit high thermal stability. The solutions may enable the use of high voltage, high-capacity Mg insertion materials as cathodes and hence open the door for research and development of high- energy density, rechargeable Mg batteries. (c) 2007 The Electrochemical Society.