Nonflammable Nitrile Deep Eutectic Electrolyte Enables High-Voltage Lithium Metal Batteries

被引：200

作者：

Hu, Zhenglin ^{[1
,2
]}

Xian, Fang ^{[3
]}

Guo, Ziyang ^{[4
]}

Lu, Chenglong ^{[1
]}

Du, Xiaofan ^{[1
]}

Cheng, Xiangyang ^{[1
]}

Zhang, Shu ^{[1
]}

Dong, Shanmu ^{[1
]}

Cui, Guanglei ^{[1
]}

Chen, Liquan ^{[5
]}

机构：

[1] Chinese Acad Sci, Qingdao Ind Energy Storage Res Inst, Qingdao Inst Bioenergy & Bioproc Technol, Qingdao 266101, Peoples R China

[2] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China

[3] Qingdao Univ, Qingdao 266071, Peoples R China

[4] Qingdao Univ Sci & Technol, Coll Chem & Mol Engn, Qingdao 266042, Peoples R China

[5] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

来源：

CHEMISTRY OF MATERIALS | 2020年 / 32卷 / 08期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

ANODE; SUCCINONITRILE; PERFORMANCE; INTERPHASE; CAPACITY; LIDFOB; PHASE;

D O I：

10.1021/acs.chemmater.9b05003

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Nonflammable functional electrolytes with remarkably interfacial compatibility toward both lithium anodes and high-voltage cathodes are considered as the ultimate pursuit for rechargeable lithium metal battery. For this target, we report a dual-anion deep eutectic solution (D-DES) based on elaborately selected combination of nitrite and functional lithium salts. The interactions of succinonitrile with cation/anion are highlighted by in situ/ex situ measurements, which endow D-DES with excellent ionic conductivity and significantly enhanced interface stability. By using this D-DES, constant LilLi cycling over 1 year (>10,000 h) under a Li capacity of 5 mA h cm(-2) can be achieved. The capacity retention is still over 70% with a high charging voltage of 4.7 V for 500 cycles in LiCoO2 vertical bar Li battery. Pouch cells with high areal capacity close to practical application also deliver superior safe performance. This study paves a new pathway for designing high-safety electrolyte and boosts the practical application of high-voltage lithium metal battery.

引用

页码：3405 / 3413

页数：9

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