AI Article Synopsis
- Fluoroethylene carbonate (FEC) and vinylene carbonate (VC) are key additives that enhance the solid electrolyte interphase (SEI) of silicon-containing anodes, while lithium difluorophosphate (LiDFP) benefits cathodes and graphite.
- The study combines VC, FEC, and varying amounts of LiDFP in a concentrated electrolyte to assess their impact on silicon-dominant anodes through various tests in Si/NCM pouch cells.
- Results indicate that adding LiDFP significantly boosts performance, with 1 wt% being optimal, and analyses reveal that higher LiDFP concentrations lead to a more effective SEI film, reducing electrolyte decomposition and improving anode structure.
Article Abstract
Fluoroethylene carbonate (FEC) and vinylene carbonate (VC) are considered the most effective electrolyte additives for improving the solid electrolyte interphase (SEI) of Si-containing anodes while lithium difluorophosphate (LiDFP) is known to improve the interphases of cathode materials and graphite. Here, we combine VC, FEC, and different amounts of LiDFP in a highly-concentrated electrolyte to investigate the effect on Si-dominant anodes in detail. Cycle life tests, electrochemical impedance spectroscopy and rate tests with anode potential monitoring were conducted in Si/NCM pouch cells. The results reveal that adding LiDFP to the electrolyte improves all performance criteria of the full cells, with a concentration of 1 wt% being the optimal value for most cases. Post-mortem analyses using scanning electron microscopy and x-ray photoelectron spectroscopy showed that a more beneficial SEI film was formed for higher LiDFP concentrations, which led to less decomposition of electrolyte components and a better-maintained anode microstructure.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/cssc.202301153 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Ionic Liquid Additive Mitigating Lithium Loss and Aluminum Corrosion for High-Voltage Anode-Free Lithium Metal Batteries.
ACS Nano
November 2024
College of Materials Science and Engineering, State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle, Hunan University, Changsha 410082, China.
Concentrated electrolytes based on lithium bis(fluorosulfonyl)imide (LiFSI) have been proposed as an effective Li-compatible electrolyte for anode-free lithium metal batteries (AFLMBs). However, these electrolytes suffer from severe aluminum corrosion at an elevated potential. To address this issue, we propose a binary ionic liquid (IL) electrolyte additive comprising the 1-methyl-1-butyl pyrrolidinium cation (Pyr), difluoro(oxalate)borate anion (DFOB), and difluorophosphate (POF) anion to mitigate the Li inventory loss and Al corrosion in 4 M LiFSI/DME electrolyte simultaneously.
View Article and Find Full Text PDFIn Situ Formation of Stable Dual-Layer Solid Electrolyte Interphase for Enhanced Stability and Cycle Life in All-Solid-State Lithium Metal Batteries.
Nano Lett
October 2024
Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.
Article Synopsis
- All-solid-state lithium metal batteries are seen as a better alternative to traditional lithium-ion batteries due to their higher energy density and improved safety.
- This study focuses on using solid polymer electrolytes, particularly PVDF and DMF, while addressing challenges posed by side reactions between lithium metal and residual DMF solvents.
- By creating a protective dual-layer solid electrolyte interphase, the research enhances the battery's cycle life to 3000 hours and achieves high stability in a lithium iron phosphate battery, retaining 84% capacity over 400 cycles.
Quantification of Charge Transport and Mass Deprivation in Solid Electrolyte Interphase for Kinetically-Stable Low-Temperature Lithium-Ion Batteries.
Angew Chem Int Ed Engl
October 2024
CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, CAS Research/Education Center for Excellence in Molecular Sciences, Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, 100190, P. R. China.
Graphite (Gr)-based lithium-ion batteries with admirable electrochemical performance below -20 °C are desired but are hindered by sluggish interfacial charge transport and desolvation process. Li salt dissociation via Li-solvent interaction enables mobile Li liberation and contributes to bulk ion transport, while is contradictory to fast interfacial desolvation. Designing kinetically-stable solid electrolyte interphase (SEI) without compromising strong Li-solvent interaction is expected to compatibly improve interfacial charge transport and desolvation kinetics.
View Article and Find Full Text PDFSynergistic Effects of Bisalt Additives in High-Voltage Rechargeable Lithium Batteries.
ChemSusChem
November 2024
Department of Chemistry, Kunsan National University, Gunsan, Jeonbuk, 54150, Republic of Korea.
The stability of high-energy-density lithium metal batteries (LMBs) heavily relies on the composition of the solid electrolyte interphase (SEI) formed on lithium metal anodes. In this study, the inorganic-rich SEI layer was achieved by incorporating bisalts additives into carbonate-based electrolytes. Within this SEI layer, the presence of LiF, polythionate, and LiN was observed, generated by combining 1.
View Article and Find Full Text PDFTuning the Interface Stability of Nickel-Rich NCM Cathode Against Aggressive Structural Collapse via the Synergistic Effect of Additives.
Inorg Chem
March 2024
School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Nickel-rich layered oxides are envisaged as one of the most promising alternative cathode materials for lithium-ion batteries, considering their capabilities to achieve ultrahigh energy density at an affordable cost. Nonetheless, with increasing Ni content in the cathodes comes a severe extent of Ni redox side reactions on the interface, leading to fast capacity decay and structural stability fading over extended cycles. Herein, dual additives of bis(vinylsulfonyl)methane (BVM) and lithium difluorophosphate (LiDFP) are adopted to synergistically generate the F-, P-, and S-rich passivation layer on the cathode, and the Ni activity and dissolution at high voltage are restricted.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!