氯
金属锂
锂(药物)
无机化学
金属
金属有机骨架
化学
材料科学
有机化学
电解质
电极
吸附
医学
内分泌学
物理化学
作者
Xu Yan,Long Jiao,Jiale Ma,Pan Zhang,Yongfu Tang,Lingmei Liu,Ying Liu,Honghe Ding,Jifei Sun,Mingming Wang,Zhenyu Li,Hai‐Long Jiang,Wei Chen
出处
期刊:Social Science Research Network
[Social Science Electronic Publishing]
日期:2022-01-01
摘要
Making primary lithium-thionyl chloride (Li-SOCl2) battery rechargeable in the lithium-chlorine (Li-Cl2) chemistry is an important milestone towards the development of high energy battery technology. Although porous carbons were used in the Li-Cl2 battery, they lack strong interaction with Cl2, which limit their electrochemical performance. Herein, we propose and design metal-organic frameworks (MOFs) with functional groups for nanoconfinement of chlorine by chemisorption in the Li-Cl2 battery. Predicted by theoretical calculations, highly porous MOF functionalized with -NH2 groups, namely UiO-66-NH2, is screened out as a model to apply in the Li-Cl2 battery. The Li-Cl2 battery using NH2-functionalized MOF (Li-Cl2@MOF) demonstrates high specific capacities up to 2000 mAh/g with excellent rate capability, and highly stable 500 cycles under a specific capacity of 1000 mAh/g at room temperature. It also exhibits superior low temperature performance, displaying a high voltage of 3.5 V and CE of 99.7% with stable 300 cycles under a capacity of 1000 mAh/g at -25 °C. Further, the Li-Cl2@MOF cell exhibits a high areal capacity of 4.4 mAh/cm2 in coin cells and a CE of 99% for over 120 cycles in large-scale pouch cells. Low-dose high-resolution transmission electron microscopy, cryogenic transmission electron microscopy, and X-ray photoelectron spectroscopy are utilized to reveal the storage mechanism on nanoconfinement of Cl2 and LiCl by UiO-66-NH2 in the Li-Cl2@MOF battery. This work provides opportunities for the promising application of functionalized MOFs as cathodes in rechargeable Li-Cl2 batteries.
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