电解质
电导率
电极
兴奋剂
材料科学
离子
相(物质)
背景(考古学)
快离子导体
分析化学(期刊)
化学工程
化学
物理化学
色谱法
有机化学
光电子学
工程类
生物
古生物学
作者
Sushobhan Kobi,Amardeep,Akhilesh Vyas,Parag Bhargava,Amartya Mukhopadhyay
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2020-08-14
卷期号:167 (12): 120519-120519
被引量:23
标识
DOI:10.1149/1945-7111/abad66
摘要
Air-stable solid electrolytes, possessing good Li-ion conductivity and facilitating low resistance at electrode/electrolyte interface, are essential towards facile development/handling of safe-cum-stable solid-state Li-ion batteries, possessing desired power densities. In this context, we report here the design and development of Al/Mg co-doped Li-La-zirconate (LLZO) based solid electrolytes that address the concerns associated with inferior air stability of Al-doped LLZO, while retaining Li-ion conductivity (∼4.7 × 10−4 s cm−1) as good as that for similarly developed Al-doped LLZO and higher than that for Mg-doped counterpart. Doping as "little" as 0.1 mole of Mg-ion (per mole of LLZO), as for the optimized Al(0.2)/Mg(0.1) co-doped LLZO, is sufficient to impart long term phase and structural stability in air, unlike that for Al-doped LLZO. Accordingly, Li-ion conductivity of Al(0.2)/Mg(0.1) co-doped LLZO gets nearly retained even after air-exposure for 50 days, in contrast to lowering of conductivity for Al-doped LLZO by ∼3 orders of magnitude after 24 days. The influence of excellent air stability and Li-ion conductivity could be seen on the Li/LLZO interfacial resistance, with the Al(0.2)/Mg(0.1) co-doped LLZO possessing the lowest area specific resistance of ∼18 Ω cm2 among those investigated, which is also among the lowest reported to-date, without any additional surface/interfacial engineering being done.
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