Get Closer to Solid Lithium Ion Conductors

Nowadays, Lithium ion batteries have almost dominated the rechargeable batteries market. It because of the high energy density factor, low self-discharge, and negligible memory effect. But, lithium ion batteries are still limited owing to the concern on safety issues. Scientist still work on the highly inflammable organic electrolytes. One of the promising invention to build lithium ion batteries which would exhibit superior and performance involves Solid lithium ion conductors material. Substituting the liquid electrolytes with solid ones would provide new opportunities in the development of advanced chemical batteries with high safety. Besides, lithium metal can be adopted as anode without worrying the existing of detrimental lithium dendrite formation. According to Cheng et al., 2019 stated that those strategy will lead us through promising an ultra-high theoritical capacity of 3860 mA.h/g (ten times higher than the currently used graphite).

Furthermore, there are three critical requirements for solid electrolytes to be used in all solid state battery. High lithium ionic conductivity and low electronic conductivity, wide electrochemical stability window, and good chemical compatibility with electrodes. During the decades, a large number of solid electrolytes have been developed, including organic solid electrolytes, composite electrolytes, and inorganic solid electrolytes (perovskites, garnets, layered Li3N, NASICON, and sulfides). In some solid electrolytes lithium ion design, rare earth elements (REE) are frequently took a part as framework elements. It can act as dopants to elevate the lithium ion conductivity. Generally speaking, ionic conductive rare earth oxide materials were divided into three categories. As additives to improve ion conduction, as the main constitutents of solid electrolytes, and as cations to carry charge in solid.

Date : 11 May 2021
Written by : NBRI
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