分离器(采油)
材料科学
化学工程
阳极
金属
共价有机骨架
纳米纤维
聚丙烯
电极
纳米技术
化学
复合材料
物理
物理化学
工程类
冶金
热力学
多孔性
作者
Ce Wang,Wanzhong Li,Yuhong Jin,Jingbing Liu,Hao Wang,Qianqian Zhang
出处
期刊:Small
[Wiley]
日期:2023-05-16
卷期号:19 (28)
被引量:36
标识
DOI:10.1002/smll.202300023
摘要
Uncontrolled ion transport and susceptible SEI films are the key factors that induce lithium dendrite growth, which hinders the development of lithium metal batteries (LMBs). Herein, a TpPa-2SO3 H covalent organic framework (COF) nanosheet adhered cellulose nanofibers (CNF) on the polypropylene separator (COF@PP) is successfully designed as a battery separator to respond to the aforementioned issues. The COF@PP displays dual-functional characteristics with the aligned nanochannels and abundant functional groups of COFs, which can simultaneously modulate ion transport and SEI film components to build robust lithium metal anodes. The Li//COF@PP//Li symmetric cell exhibits stable cycling over 800 h with low ion diffusion activation energy and fast lithium ion transport kinetics, which effectively suppresses the dendrite growth and improves the stability of Li+ plating/stripping. Moreover, The LiFePO4//Li cells with COF@PP separator deliver a high discharge capacity of 109.6 mAh g-1 even at a high current density of 3 C. And it exhibits excellent cycle stability and high capacity retention due to the robust LiF-rich SEI film induced by COFs. This COFs-based dual-functional separator promotes the practical application of lithium metal batteries.
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