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:9
标识
DOI:10.1002/smll.202300023
摘要
Abstract 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‐2SO 3 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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