Sep 2026· Journal of Physics, Conference Series· Vol 3322, pp. 012048· 0 citations· 9 references
Physics
Abstract
The high-voltage performance of sodium-ion batteries is strongly influenced by electrolyte chemistry, as parasitic reactions at the cathode interface can accelerate capacity loss. For layered oxide cathodes, the instability of the cathode-electrolyte interphase (CEI) becomes more severe at elevated voltages. Thus, optimizing the electrolyte is critical for maintaining interfacial stability and long-term cycling behavior. In this work, a NaFSI-containing ionic liquid electrolyte was introduced and compared with a conventional carbonate electrolyte using P2-type Na2/3Li1/4Sb1/12Mn2/3O2 as a model cathode. Within 1.5-4.5 V at 50 mA g−1, the IL-based cell retains 70.5% of its initial capacity after 200 cycles, while the carbonate-based cell retains only 25.3%. ToF-SIMS depth analysis together with 3D reconstruction indicates that the ionic-liquid electrolyte facilitates the formation of a spatially homogeneous CEI containing a relatively stable inorganic-rich domain. This interface is associated with reduced electrolyte decomposition and mitigated high-voltage interfacial degradation. The present results suggest that regulating interfacial chemistry through ionic-liquid electrolytes is beneficial for enhancing the durability of high-voltage sodium-ion batteries.
Lithium-ion batteries (LIBs) employing high-nickel layered oxide cathodes are regarded as highly promising candidates for high energy density. However, operating Ni-rich cathodes at elevated cut-off voltage accelerates electrolyte decomposition and irreversible structural deterioration. To address these obstacles, we d...
Jia-Jia Huang, Jia-He Chen, Hao-Ran Ma et al.· ChemSusChem· 0 citations
Raising the upper cutoff voltage and deploying Ni-rich layered oxides (e.g., NMC811) are promising routes to higher lithium-ion cell energy density. However, the origin of degradation remains unclear at high-voltage operation. We propose using a cycle-relevant scan rate (1.0 mV s−1) cyclic voltammetry in a three-elec...
Kyumin Kim, O. Voznyy· ACS Applied Engineering Mate...· 0 citations
Sodium-ion batteries (SIBs) have emerged as promising alternatives for large-scale energy storage owing to the abundance and low cost of sodium. However, layered oxide cathodes suffer from severe surface degradation and irreversible phase transitions during high-voltage cycling, limiting their electrochemical perform...
S. Gong, In Soo Kim, M. Cho et al.· ACS Applied Energy Materials· 0 citations
Sodium metal batteries are plagued by the uncontrollable growth of sodium dendrites, which leads to short circuits and limits their practical applications. This work enhances the stability of the sodium metal anode through a combined strategy of constructing the solid electrolyte interphase (SEI) and modifying the curr...
Gui-Shan Liu, Shu-Hua Hao, Jian-Hui Ma et al.· Small· 0 citations
Hard carbon (HC) anodes in sodium-ion batteries (SIBs) suffer interfacial instability in conventional carbonate electrolytes. Vinyltrimethylsilane (VTMS) is introduced as a multifunctional additive to stabilize both electrolyte phase and electrode-electrolyte interface layers (EEILs). VTMS scavenges HF and disrupts s...
Y. Wan, Jing-Kang Ma, Wei-Fu Yuan et al.· ACS Energy Letters· 0 citations
High-capacity Li-rich Mn-based oxide cathodes exhibit exceptional specific capacity density; however, their utilization encounters challenges pertaining to sluggish Li+ ion transport kinetics and severe interfacial issues in high-voltage lithium-ion batteries, especially under the working condition of fast charging. He...
