Formulating Electrolytes for 4.6 V Anode-Free Lithium Metal Batteries

被引:0
|
作者
Deng, Jiaojiao [1 ]
Lin, Hai [2 ]
Hu, Liang [3 ,4 ]
Zhan, Changzhen [3 ,4 ]
Weng, Qingsong [3 ,4 ]
Yu, Xiaoliang [3 ,4 ]
Sun, Xiaoqi [5 ]
Zhang, Qianlin [1 ]
Mo, Jinhan [6 ]
Li, Baohua [2 ]
机构
[1] Shenzhen Univ, Coll Chem & Environm Engn, Graphene Composite Res Ctr, Shenzhen 518060, Peoples R China
[2] Tsinghua Shenzhen Int Grad Sch, Shenzhen Geim Graphene Ctr, Shenzhen Key Lab Power Battery Safety Res, Shenzhen 518055, Peoples R China
[3] Hong Kong Polytech Univ, Dept Mech Engn, Hong Kong, Peoples R China
[4] Hong Kong Polytech Univ, Res Inst Smart Energy, Hong Kong, Peoples R China
[5] Northeastern Univ, Dept Chem, Shenyang 110819, Peoples R China
[6] Shenzhen Univ, Coll Civil & Transportat Engn, Shenzhen 518060, Peoples R China
来源
MOLECULES | 2024年 / 29卷 / 20期
基金
中国国家自然科学基金;
关键词
lithium metal battery; anode free; high voltage; electrolyte; interphase; SALT;
D O I
10.3390/molecules29204831
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
High-voltage initial anode-free lithium metal batteries (AFLMBs) promise the maximized energy densities of rechargeable lithium batteries. However, the reversibility of the high-voltage cathode and lithium metal anode is unsatisfactory in sustaining their long lifespan. In this research, a concentrated electrolyte comprising dual salts of LiTFSI and LiDFOB dissolved in mixing solvents of dimethyl carbonate (DMC) and fluoroethylene carbonate (FEC) with a LiNO3 additive was formulated to address this challenge. FEC and LiNO3 regulate the anion-rich solvation structure and help form a LiF, Li3N-rich solid electrolyte interphase (SEI) with a high lithium plating/stripping Coulombic efficiency of 98.3%. LiDFOB preferentially decomposes to effectively suppress the side reaction at the high-voltage operation of the Li-rich Li1.2Mn0.54Ni0.13Co0.13O2 cathode. Moreover, the large irreversible capacity during the initial charge/discharge cycle of the cathode provides supplementary lithium sources for cycle life extension. Owing to these merits, the as-fabricated AFLMBs can operate stably for 80 cycles even at an ultrahigh voltage of 4.6 V. This study sheds new insights on the formulation of advanced electrolytes for highly reversible high-voltage cathodes and lithium metal anodes and could facilitate the practical application of AFLMBs.
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页数:10
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