Citation: Huang Fanyang, Jie Yulin, Li Xinpeng, Chen Yawei, Cao Ruiguo, Zhang Genqiang, Jiao Shuhong. Correlation between Li Plating Morphology and Reversibility of Li Metal Anode[J]. Acta Physico-Chimica Sinica, ;2021, 37(1): 200808. doi: 10.3866/PKU.WHXB202008081 shu

Correlation between Li Plating Morphology and Reversibility of Li Metal Anode

Hefei National Laboratory for Physical Sciences at the Microscale, Department of Materials Science and Engineering, CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei 230026, China

Corresponding author: Jiao Shuhong, jiaosh@ustc.edu.cn

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Received Date: 27 August 2020
Revised Date: 27 September 2020
Accepted Date: 28 September 2020
Available Online: 19 October 2020
Fund Project: the National Natural Science Foundation of China 21776265the National Key Research and Development Program of China 2017YFA0206700the Anhui Provincial Natural Science Foundation 1908085ME122The project was supported by the National Key Research and Development Program of China (2017YFA0402802, 2017YFA0206700), the National Natural Science Foundation of China (51902304, 21776265), the Anhui Provincial Natural Science Foundation (1908085ME122), the Fundamental Research Funds for the Central Universities, China (Wk2060140026)the Fundamental Research Funds for the Central Universities, China Wk2060140026the National Key Research and Development Program of China 2017YFA0402802the National Natural Science Foundation of China 51902304

Commercialization of high-energy rechargeable batteries can promote the rapid development of portable electronics and electric vehicles. Li metal batteries (LMBs) have attracted considerable attention owing to their high theoretical energy density. Li metal anodes (LMAs) used in LMBs suffer from the disadvantages of high reactivity, interface instability and dendrite growth, which impede the practical development of the LMBs. Coulombic efficiency (CE), which depends on the type of electrolyte used, is one of the key parameters for evaluating the reversibility of battery systems. Herein, we use atomic force microscopy (AFM) to study the initial plating stages and growth of the lithium metal in different electrolytes, such as 1 mol·L^-1 lithium hexafluorophosphate (LiPF₆)-ethylene carbonate/dimethyl carbonate (EC/DMC, 1 : 1, V/V), 1 mol·L^-1 LiPF₆-EC/DMC (1 : 1, V/V) + 5% (mass fraction, w) fluoroethylene carbonate (FEC), 1 mol·L^-1 lithium bis(trifluoromethanesulfonyl)imide (LiTFSI)-1, 3-dioxolane/dimethoxyethane (DOL/DME, 1 : 1, V/V) + 2% (w) lithium nitrate (LiNO₃), and 4 mol·L^-1 lithium bis(fluorosulfonyl)imide (LiFSI)-DME, and further investigate the correlation between the CE of LMA and Li plating morphology. There are two types of Li morphologies in these electrolytes: strip-like and particle-like morphology. Since the specific surface area of particle-like deposits is much smaller than that of strip-like deposits, the particle-like morphology facilitates higher CE. (1) In the conventional carbonate electrolyte (1 mol·L^-1 LiPF₆-EC/DMC), Li predominantly forms strip-like deposits with large specific surface area, consuming much active Li (due to the side reaction between Li and the electrolyte). The dendrite morphology of the Li deposits lead to the formation of dead Li during the stripping process, which results in low CE. (2) FEC, an effective additive often used in carbonate electrolyte, can induce the transformation of Li plating morphology from strip-like to particle-like morphology. Therefore, the CE in FEC-containing electrolytes has been significantly improved with stable electrode/electrolyte interphase and small specific surface area of deposited Li. (3) In ether electrolytes, which have better compatibility with LMAs than carbonate electrolytes, Li metal exhibits a particle-like morphology and achieves high CE. (4) In the highly concentrated electrolyte (4 mol·L^-1 LiFSI-DME), Li metal grows into large particles without dendrite formation, which hampers the parasitic side reactions, and further enhances CE.
- Li metal anode,
- Coulombic efficiency,
- Plating morphology,
- Electrolyte,
- Atomic force microscopy
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  南开大学师唯/华北电力大学（保定）刘景维：二维配位聚合物中有序的亲锂冠醚位点用于无枝晶锂沉积
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Correlation between Li Plating Morphology and Reversibility of Li Metal Anode

南开大学师唯/华北电力大学（保定）刘景维：二维配位聚合物中有序的亲锂冠醚位点用于无枝晶锂沉积

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通讯作者: 陈斌, bchen63@163.com