材料科学
阳极
分离器(采油)
枝晶(数学)
化学工程
电解质
共价键
阴极
金属
锂(药物)
共价有机骨架
纳米技术
无机化学
有机化学
复合材料
电极
化学
物理化学
冶金
内分泌学
几何学
工程类
物理
热力学
医学
数学
多孔性
作者
Ying Xu,Yang Zhou,Tao Li,Shuaihu Jiang,Xueren Qian,Yuwen Qin,Yijin Kang
标识
DOI:10.1016/j.ensm.2019.10.005
摘要
For its high specific capacity of 3860 mAh g−1 and low redox potential of −3.04 V (vs. SHE), lithium (Li) metal has been regarded as one of the most promising anode materials for the next-generation batteries. However, the limited Li utilization and the detrimental dendrite growth severely impede the practical application of Li metal batteries. Herein, the covalent organic frameworks LZU1 (COF-LZU1) is introduced to serve as a protective layer in-between the Li anode and separator. Because of the interaction between bis(trifluoromethanesulonyl)imide (TFSI) anions and aldehyde functional groups in COF-LZU1, TFSI− are immobilized on the COF-LZU1, alleviating the impact of space charge and hence suppressing the dendrite growth. Furthermore, the imine-linked COF-LZU1 is lithiophilic and electrolyte wettable, enabling a homogenous Li ions flux distribution and transport and hence resulting in a low voltage hysteresis. With the dendrite-free anode, the utilization of Li achieves >99% in Li–Cu cell and the life-span is over 2000 h in Li–Li symmetric cell with a low voltage hysteresis of ≈35 mV. Moreover, Li-Sulfur batteries with COF-LZU1 layer present significantly better stability and rate properties than the ones without COF-LZU1. Therefore, utilization of the COF-LZU1 protective layer has been successfully demonstrated to be an effective approach to enable safe and high power/energy density Li metal batteries.
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