Ridwan A. Ahmed, Krishna Prasad Koirala, Qian Zhao, Ju-Myung Kim, Cassidy Anderson, Chongmin Wang, Ji-Guang Zhang and Wu Xu*,
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引用次数: 0
Abstract
Lithium (Li) metal batteries (LMBs) are some of the most promising high energy density batteries to meet the demands of electric transportation. However, the practical applications of LMBs are hindered by short cycle life and safety concerns, mainly associated with the side reactions between Li metal anode and liquid electrolyte and the growth of Li dendrites during cycling. In this study, we develop a stable artificial solid electrolyte interphase (aSEI) layer, which consists of a surface-treated (ST) PEO–Li6.4Ga0.2La3Zr2O12 composite polymer coating layer (CPL) on a Li metal anode. The developed aSEI is stable against a selected electrolyte and enables a uniform electrodeposition of Li. Therefore, STCPL@Li||LiNi0.8Mn0.1Co0.1O2 (NMC811) cells exhibit improved cycling stability compared with bare Li||NMC811 cells at moderate to high current densities. Notably, using a 50 μm-thick Li and a practical NMC811 cathode (∼4.8 mAh cm–2), a capacity retention of 85% is obtained for STCPL@Li||NMC811 cells at a current density of 2.4 mA cm–2 after 300 cycles compared with 24% for bare Li||NMC811 cells. Furthermore, STCPL@Li||NMC811 cells demonstrate higher capacities at charge current densities of 2.4, 4.8, and 7.2 mA cm–2 compared with bare Li||NMC811 cells. These findings suggest that STCPL is promising for high current density practical LMBs.
锂金属电池(lmb)是满足电动交通需求的最有前途的高能量密度电池之一。然而,lmb的实际应用受到循环寿命短和安全性问题的阻碍,主要与锂金属阳极与液体电解质的副反应以及循环过程中锂枝晶的生长有关。在本研究中,我们开发了一种稳定的人工固体电解质界面(aSEI)层,该层由表面处理(ST) PEO-Li6.4Ga0.2La3Zr2O12复合聚合物涂层(CPL)组成。所开发的aSEI对选定的电解质是稳定的,并且能够均匀地电沉积锂。因此,STCPL@Li||LiNi0.8Mn0.1Co0.1O2 (NMC811)电池在中高电流密度下比裸Li||NMC811电池表现出更好的循环稳定性。值得注意的是,使用50 μm厚的锂电池和实用的NMC811阴极(~ 4.8 mAh cm-2),在2.4 mA cm-2的电流密度下,STCPL@Li||NMC811电池在300次循环后的容量保持率为85%,而裸锂||NMC811电池的容量保持率为24%。此外,STCPL@Li||NMC811电池在2.4、4.8和7.2 mA cm-2的充电电流密度下比裸锂||NMC811电池表现出更高的容量。这些发现表明STCPL在高电流密度的实用lmb中是有前景的。
期刊介绍:
ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.