Phosphate-based localized high-concentration electrolytes (LHCE) feature high flame retardant and satisfactory cathodic stability for lithium metal batteries. However, stable cycling of those electrolytes at ultra-high upper cut-off voltages for long-term stability remains challenging. Herein, an ether-modified phosphate, diethyl (2-methoxy ethoxy) methylphosphonate (DMEP), is designed for high-voltage applications. The ether modification enhances the stability of the Li-DMEP-FSI coordination structure, promoting the formation of cation-anion aggregates (AGG) dominated solvation structure, which favors the generation of LiF-rich cathode electrolyte interphase layers compared to triethyl phosphate (TEP)-based LHCE. Consequently, cathode degradation, including transition-metal dissolution and electrode cracking, is well-suppressed. The LiNiCoMnO (NCM811)||Li full cells using DMEP-based LHCEs show more than 90.7% capacity retention at an ultrahigh upper cut-off voltage of 4.7 V after 100 cycles. Notably, DMEP-LHCE exhibits enhanced safety than that of TEP-LHCE, suggesting its versatility and potential for next-generation lithium metal batteries.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/adma.202312302 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Metallic Bonding in Close-Packed Structures: Structural Frustration from a Hidden Gauge Symmetry.
Phys Rev Lett
December 2024
Department of Physics, Brock University, St. Catharines, Ontario L2S 3A1, Canada.
Based on its simple valence electron configuration, we may expect lithium to have straightforward physical properties that are easily explained. However, solid lithium, when cooled below 77 K, develops a complex structure that has been debated for decades. A close parallel is found in sodium below 36 K where the crystal structure still remains unresolved.
View Article and Find Full Text PDFHigh-Rate 4.2 V Solid-State Potassium Batteries by In Situ Polymerized Epoxide Ether Electrolyte.
Nano Lett
January 2025
College of Materials Science and Engineering, Hunan Joint International Laboratory of Advanced Materials and Technology of Clean Energy, Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha 410082, China.
Article Synopsis
- Solid-state metallic potassium batteries (SSMPBs) are gaining attention as alternatives to lithium batteries, but face challenges like low ionic conductivity and high interfacial resistance.
- Researchers achieved improved performance by using in situ ring-opening polymerization with a plasticizer and catalyst, resulting in short-chain polyether electrolytes that significantly enhance ionic conductivity.
- The developed SSMPBs show a high discharge capacity of 69 mAh/g at 100 mA/g and 88.8% capacity retention after 100 cycles, outperforming previous SSMPB studies.
Enhancing cathode composites with conductive alignment synergy for solid-state batteries.
Sci Adv
January 2025
Department of Mechanical Engineering, University of Delaware, Newark, DE 19716, USA.
Article Synopsis
- Enhancing transport and mechanical properties in cathode composites is essential for solid-state battery performance.
- The FAST electrode features vertically aligned carbon nanotubes in a polymer electrolyte, improving ionic and electronic conductivity while reinforcing the electrode.
- This innovative design leads to excellent electrochemical performance, achieving a capacity of 148.2 mAh/g at 0.2 C over 100 cycles, indicating progress in solid-state lithium metal battery technology.
Converting a Metal-Coordinating Polymer to a Polymerized Ionic Liquid Improves Li Transport.
ACS Macro Lett
January 2025
Materials Department, University of California, Santa Barbara, California 93106, United States.
Solid polymer electrolytes (SPEs) with mechanical strength and reduced flammability may also enable next-generation Li batteries with higher energy densities. However, conventional SPEs have fundamental limitations in terms of Li conductivity. While an imidazole functionalized polymer (PMS-Im) has been previously shown to have ionic conductivity related to the imidazole-Li coordination, herein we demonstrate that quaternization of this polymer to form an analogous imidazolium functionalized polymer (PMS-Im) more efficiently solvates lithium salts and plasticizes the polymer.
View Article and Find Full Text PDFDetermination of streptococcus mutans retention in acidic and neutral pH artificial saliva environment of all-ceramic materials with different surface treatment.
BMC Oral Health
January 2025
Department of Basic Medical Science, Faculty of Medicine, Yozgat Bozok University, Yozgat, 66100, Türkiye, Turkey.
Background: Although surface finishing processes are effective against Streptococcus mutans biofilm, the mechanism of action of saliva with different acidity values has not been studied in detail. This study aims to produce four different all-ceramic materials in a single session with CAD/CAM devices and apply two different surface finishing processes, glazing and polishing, and then determine the retention of Streptococcus mutants on the surfaces of the materials in saliva with varying levels of acidity.
Methods: Zirconia-reinforced lithium silicate (Vita Suprinity, Vita Zahnfabrik, Bad Saöckingen, Germany), monochromatic feldspar (Vitablocs Mark 2, Vita Zahnfabrik, Bad Saöckingen, Germany), leucite glass ceramic (IPS Empress CAD, Ivoclar Vivadent, Liechtenstein), and monolithic zirconia (Incoris TZI (Cerec) Sirona, Germany) were used in the study.
Want 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!