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Zhou H, Li T, Liu W, Guo Z, Su Z, Gao J, Qu M, Peng G. A Bifunctional Fluorine-Free Electrolyte Additive for Realizing Dendrite-Free Lithium Anodes. CHEMSUSCHEM 2023; 16:e202300186. [PMID: 36780130 DOI: 10.1002/cssc.202300186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 02/12/2023] [Accepted: 02/13/2023] [Indexed: 05/20/2023]
Abstract
Owing to the strong energy advantage of lithium anodes, the development of lithium-metal batteries has become an inevitable trend. However, plagued by the instability of solid-electrolyte interphase (SEI) films, lithium metal anodes face challenges such as lithium dendrite formation and volume expansion. Studies have proven that modulating the composition and structure of SEI films by using electrolyte additives is a convenient and valid method. Currently, it is widely accepted that fluoride is an effective additive but, based on the high cost of fluoride production and environmental concerns, the development of fluoride-free additives is of great significance. In this work, the bifunctional additive N,O-bis(trimethylsilyl)acetamide (BSA) is proposed, which can build up a SEI layer that is rich in SiOx and Li3 N on the surface of the lithium anode to control the deposition behavior of lithium and clean the electrolyte of HF to protect the electrode. The experimental results indicate that BSA suppresses the generation of lithium dendrites and controls the volume expansion of lithium anodes. Moreover, compared with the commonly used carbonate electrolytes, the battery containing BSA has the best overall performance. Methodologically, the results can be extended to other additives containing Si-O functional groups to replace the same type of fluorine-containing additives.
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Affiliation(s)
- Hanxiao Zhou
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences Chengdu, Sichuan, 610041, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Tianhui Li
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences Chengdu, Sichuan, 610041, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Wenjing Liu
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences Chengdu, Sichuan, 610041, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Zhihao Guo
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences Chengdu, Sichuan, 610041, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Zihao Su
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences Chengdu, Sichuan, 610041, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Jingjing Gao
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences Chengdu, Sichuan, 610041, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Meizhen Qu
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences Chengdu, Sichuan, 610041, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Gongchang Peng
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences Chengdu, Sichuan, 610041, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
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Jiang Y, Lu S, Jiang J, Li M, Liao Y, Xu Y, Huang S, Zhao B, Zhang J. Optimized Solid Electrolyte Interphase and Solvation Structure of Potassium Ions in Carbonate Electrolytes for High-Performance Potassium Metal Batteries. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023:e2300411. [PMID: 37029576 DOI: 10.1002/smll.202300411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 03/06/2023] [Indexed: 06/19/2023]
Abstract
The introduction of electrolyte additives is one of the most potential strategies to improve the performance of potassium metal batteries (PMBs). However, designing an additive that can alter the K+ solvation shell and essentially inhibit K dendrite remains a challenge. Herein, the amyl-triphenyl-phosphonium bromide was introduced as an additive to build a stable solid electrolyte interphase layer. The amyl-TPP cations can form a cation shielding layer on the metal surface during the nucleation stage, preventing K+ from gathering at the tip to form K dendrites. Besides, the cations can be preferentially reduced to form Kx Py with fast K+ transport kinetics. The Br- anions, as Lewis bases with strong electronegativity, can not only coordinate the Lewis acid pentafluoride to inhibit the formation of HF, but also change the K+ solvation structure to reduce solvent molecules in the first solvation structure. Therefore, the symmetrical battery exhibits a low deposition overpotential of 123 mV at 0.1 mA cm-2 over 4200 h cycle life. The full battery, paried with a perylene-tetracarboxylic dianhydride (PTCDA) cathode, possesses a cycle life of 250 cycles at 2 C and 81.9% capacity retention. This work offers a reasonable electrolyte design to obtain PMBs with long-term stablity and safety.
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Affiliation(s)
- Yong Jiang
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China
| | - Shangying Lu
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China
| | - Jinlong Jiang
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China
| | - Meng Li
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China
| | - Yalan Liao
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China
| | - Yi Xu
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China
| | - Shoushuang Huang
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China
| | - Bing Zhao
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China
| | - Jiujun Zhang
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China
- Institute for Sustainable Energy/College of Sciences, Shanghai University, Shanghai, 200444, China
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