可充镁电池有机电解液的研究进展

The development of organic electrolyte for rechargeable magnesium battery

对有机格氏试剂盐系列电解质的研究进行了总结。镁的沉积过程是复杂的吸附过程。吸附物决定了沉积的形貌,对循环效率有很大影响。Mg(AX4-nRn)2型有机镁盐(其中A=Al、B、As、P、Sb、Ta和Fe等,X=Cl、Br和F,R=烷基或芳基)可以看作是Lewis碱R2Mg和Lewis酸AX3-nR′n的反应产物,溶液中Lewis酸的浓度决定了电液的分解电位,R基的含量决定可逆性的好坏,以THF/Bu2Mg (AlCl2Et)2体系性能最佳。

The development of organic electrolyte of magnesium battery was reviewed. Mg deposition-dissolution involved adsorption-desorption process. The specific absorbed species affected the final morphology of Mg deposition, which strongly affected the cycling efficiency of Mg deposit. The grignard salts of Mg(AX_(4-n)R_n)_2 type (A=Al, B, As, P, Sb, Ta and Fe; X= Cl, Br and F, and R=alkyl or aryl) could be expected to be products of a reaction between an R_2Mg Lewis base which played a key role of the decomposition potential of electrolyte and an AX_(3-n)R~′_n Lewis acid. The content of R groups was crucial for obtaining reversible magnesium deposition. The best performance was obtained with the solutions containing the THF/Bu_2Mg-(AlCl_2Et)_2.