Electrolyte Interphase Built from Anionic Covalent Organic Frameworks for Lithium Dendrite Suppression

被引：78

作者：

Li, Xinru ^{[1
]}

Tian, Yue ^{[2
,3
]}

Shen, Li ^{[1
]}

Qu, Zhibin ^{[4
]}

Ma, Tianqiong ^{[5
]}

Sun, Fei ^{[4
]}

Liu, Xiaoyan ^{[2
,3
]}

Zhang, Chen ^{[1
]}

Shen, Jianqiang ^{[1
]}

Li, Xianyang ^{[1
]}

Gao, Lina ^{[6
]}

Xiao, Shengxiong ^{[2
,3
]}

Liu, Taifeng ^{[2
,3
]}

Liu, Yi ^{[2
,3
]}

Lu, Yunfeng ^{[1
]}

机构：

[1] Univ Calif Los Angeles, Dept Chem & Biomol Engn, Los Angeles, CA 90095 USA

[2] Shanghai Normal Univ, Sch Chem & Mat Sci, Key Lab Resource Chem, Educ Minist, Shanghai 200234, Peoples R China

[3] Shanghai Normal Univ, Sch Chem & Mat Sci, Shanghai Key Lab Rare Earth Funct Mat, Shanghai 200234, Peoples R China

[4] Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Peoples R China

[5] Peking Univ, Beijing Natl Lab Mol Sci, Coll Chem & Mol Engn, Beijing 100871, Peoples R China

[6] Zhejiang Univ, Sch Mat Sci & Engn, Hangzhou 310027, Peoples R China

来源：

ADVANCED FUNCTIONAL MATERIALS | 2021年 / 31卷 / 22期

关键词：

anionic covalent organic frameworks; dendrite suppression; electrolyte interphase; Li metal anodes; HIGH-ENERGY; ION; LAYER; SILICON;

D O I：

10.1002/adfm.202009718

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Lithium (Li) metal batteries hold considerable promise for numerous energy-dense applications. However, the dendritic Li anode produced during Li+/Li deposition-stripping endangers battery safety and shortens cycle lifespan. Herein, an electrolyte interphase built from 2D anionic covalent organic frameworks (ACOF) is coated on Li for dendrite suppression. The ACOF with Li+-affinity facilitates rapid and exclusive passage of Li-ions from the electrolyte, yielding near-unity Li+ transference number (0.82) and ionic conductivity beyond 3.7 mS cm(-1) at the interphase. Such high transport efficiency of Li-ions can fundamentally circumvent the Li+ deficiency that results in dendrite formation. Pairing the ACOF-coated Li against a high-voltage LiCoO2 cathode (4.5 V) achieves exceptional cycle stability, mitigated polarization, as well as improved rate capability. Accordingly, this strategy vastly expands the pool of electrolyte interphases that can be used for coating and protecting Li anode.

引用

页数：8

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