高比能水体系锂电池研究

Investigation of High-Energy-Density Lithium Battery with Aqueous Electrolyte Solution

实现水溶液锂电池的关键技术是如何保护金属锂电极不与水反应。提出了一种保护金属锂电极,其不仅在有机电解液体系稳定而且在水溶液中也可稳定工作,这种锂电极可以用于水体系锂电池。该研究制备了双层锂离子电解质保护的金属锂电极,其外层采用的LAGP(Li1+x+yAlxGe2-x SiyP3-yO12)玻璃陶瓷电解质相对于包括水溶液等电解液是稳定的,该玻璃陶瓷电解质的电导率达到0.57 mS cm-1。通过交流阻抗评估发现不同电解质间的界面阻抗是水体系锂电池内阻的主要来源。最终采用双层保护金属锂电极制备的水体系锂空气电池和锂水电池可以稳定工作。

The key technology for aqueous lithium battery is protecting lithium from water.A protected lithium electrode which is stable not only in organic electrolyte but also in aqueous solutions and which can be used in aqueous lithium battery is proposed.The double layer Li-ion conductive electrolyte protected lithium electrode has been prepared.The front layer of LAGP（Li1＋x＋y AlxGe2-x SiyP3-yO12） glass-ceramic with ionic conductivity of 0.57 mS cm^-1 which is stable to electrolyte including aqueous solution.It is found that the impedance of interface of LAGP/liquid electrolyte is the major one for aqueous lithium battery.Finally,Li-Air battery and Li-Water battery have been assembled,and the two types of aqueous lithium battery are capable of work by using double layer protected lithium electrode.