Solid Electrolyte Interphase Recombination on Graphene Nanoribbons for Lithium Anode

Abstract

The practical application of lithium metal batteries is hindered by the lithium dendrite issue, which is seriously affected by the composition and structure of the solid electrolyte interphase (SEI). Modifying the SEI can regulate lithium dendrite formation and growth. Here, we experimentally realize a Li protective layer of LiTFSI-ether electrolyte induced a natural SEI grafted on graphene nanoribbons (SEI@ GNRs) via their in situ reactions. The experimental results and theoretical calculations uncover that the 3D structure of SEI@ GNRs can reduce the local current density and Li + flux. The natural SEI in SEI@GNRs, especially the rich inorganic species of LiF, Li 3 N, and Li 2 S, decreases the Li + nucleation overpotential, makes Li + ion deposition and nucleation uniform, and isolates electron transport. Their synergetic effect suppresses Li dendrite formation and growth, increasing the electrochemical performance of lithium metal batteries. The design strategy is beneficial for the development of lithium metal batteries.

Rational Molecular Engineering via Electron Reconfiguration toward Robust Dual-Electrode/Electrolyte Interphases for High-Performance Lithium Metal Batteries

“…Lithium metal batteries (LMBs), coupling lithium metal anodes with high-voltage nickel-rich cathodes (e.g., LiNi 0.8 Mn 0.1 Co 0.1 O 2 , NCM811), are considered as one of the most promising next-generation battery technologies due to their high energy density. , Nevertheless, LMBs have been seriously hindered by unstable electrode/electrolyte interphases (EEIs). , On the anode side, uncontrollable parasitic interfacial reactions and a fragile solid–electrolyte interphase (SEI) result in a series of formidable issues, such as dendritic growth, “dead Li” formation, and electrolyte depletion. , On the cathode side, chaotic arrangement of Ni/Li ions and continuous interface side reactions aggravate structural degradation and even serious particle cracks, which prejudice the stability of the cathode/electrolyte interface (CEI) . Moreover, sluggish kinetics of EEIs constrain ion diffusion and charge transfer, regressing high-rate performance and low-temperature applications. , The construction of robust dual-electrode/electrolyte interphases, including SEI and CEI, is a precondition for practical LMBs.…”

π–π Stacked Nigrosine@Carbon Nanotube Nanocomposite as an All-in-One Additive for High Energy Flexible Batteries

“…The ever-increasing energy demand for electronic devices has prompted intensive research into high energy density lithium-ion batteries. − A fundamental principle for enhancing energy density is to maximize the proportion and specific capacities of electroactive materials − while minimizing the proportion of inactive substances. , In conventional electrode processing, conductive agents and metallic current collectors are frequently used to improve the electronic conductivity of electrode materials, while binders (e.g., polyvinylidene fluoride, PVDF) are incorporated to connect the active materials, conductive agents, and current collectors. , These components inevitably increase the weight of the electrode and, consequently, reduce the overall energy density. To address this problem, it is imperative to develop efficient electrodes with the low content/absence of inactive components. , …”