DOI: 10.1016/j.scib.2020.09.018
论文题名: Electrolytes enriched by potassium perfluorinated sulfonates for lithium metal batteries
作者: Qi S. ; Wang H. ; He J. ; Liu J. ; Cui C. ; Wu M. ; Li F. ; Feng Y. ; Ma J.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2021
卷: 66, 期: 7 起始页码: 685
结束页码: 693
语种: 英语
中文关键词: Additives
; Electrolyte
; Lithium anode protection
; Lithium metal batteries
; Potassium perfluorinated sulfonates
英文关键词: Additives
; Anodes
; Calculations
; Cathodes
; Ions
; Lithium
; Lithium batteries
; Molecular dynamics
; Potassium
; Electrochemical behaviors
; Electrochemical potential
; Electrolyte additives
; Electrostatic shields
; First-principles calculation
; High voltage cathode
; Molecular dynamics simulations
; Solid electrolyte interphase
; Solid electrolytes
英文摘要: Lithium (Li) metal is widely considered as a promising anode for next-generation lithium metal batteries (LMBs) due to its high theoretical capacity and lowest electrochemical potential. However, the uncontrollable formation of Li dendrites has prevented its practical application. Herein, we propose a kind of multi-functional electrolyte additives (potassium perfluorinated sulfonates) from the multi-factor principle for electrolyte additive molecular design (EDMD) view to suppress the Li dendrite growth. The effects of these additives are revealed through experimental results, molecular dynamics simulations and first-principles calculations. Firstly, K+ can form an electrostatic shield on the surface of Li anode to prevent the growth of Li dendrites. Secondly, potassium perfluorinated sulfonates can improve the activity of electrolytes as co-conductive salts, and lower the electro-potential of Li nucleation. Thirdly, perfluorinated sulfonate anions not only can change the Li+ solvation sheath structure to decrease the desolvation energy barrier and increase the ion migration rate, but also can be partly decomposed to form the superior solid electrolyte interphase (SEI). Benefited from the synergistic effects, an outstanding cycle life over 250 h at 1 mA cm−2 is achieved in symmetric Li||Li cells. In particular, potassium perfluorinated sulfonate additives (e.g., potassium perfluorohexyl sulfonate, denoted as K+PFHS) can also contribute to the formation of high-quality cathode electrolyte interphase (CEI). As a result, Li||LiNi0.6Mn0.2Co0.2O2 full cells exhibit significantly enhanced cycling stability. This multi-factor principle for EDMD offers a unique insight on understanding the electrochemical behavior of ion-type electrolyte additives on both the Li metal anode and high-voltage cathode. © 2020 Science China Press Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170369
Appears in Collections: 气候变化与战略
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作者单位: School of Physics and Electronics, Hunan University, Changsha, 410082, China; Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education, Zhengzhou University, Zhengzhou, 450002, China
Recommended Citation:
Qi S.,Wang H.,He J.,et al. Electrolytes enriched by potassium perfluorinated sulfonates for lithium metal batteries[J]. Science Bulletin,2021-01-01,66(7)