The demand for fast-charging metal-ion batteries underlines the importance of anodes that work at high currents with no risk of dendrite formation. NiBTA, a one-dimensional Ni-based polymer derived from benzenetetramine (BTA), is a recently proposed promising material for safe fast-charging batteries. However, its charge-discharge mechanisms remained unclear and controversial. Here we solve the controversies by providing the first rigorous study using a combination of advanced theoretical and experimental techniques, including and X-ray diffraction, Raman spectroscopy and X-ray absorption near-edge spectroscopy (XANES). In safe potential ranges (0.5-2.0 V M/M, M = Li, Na or K), NiBTA offers high capacities, fast charge-discharge kinetics, high cycling stability and compatibility with various cations (Li, Na, K). In the Na- and K-based cells, fast bulk faradaic processes are manifested for partially reduced states. Atomistic simulations explain the fast kinetics by facile rotations and displacements of the macromolecules in the crystal, opening channels for fast ion insertion. The material undergoes distinct crystal structure rearrangements in the Li-, Na- and K-based systems, which explains different electrochemical features. At the molecular level, the charge storage mechanism involves reversible two-electron reduction of the repeating units accompanied by a change of the absorption bandgap. The reversible reduction involves filling of the orbitals localized at the ligand moieties. No reduction of NiBTA beyond two electrons per repeating unit is observed at potentials down to 0 V M/M.
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http://dx.doi.org/10.1039/d2sc03127b | DOI Listing |
Recent Pat Nanotechnol
January 2025
Ansteel Beijing Research Institute Co., Ltd., Beijing 102211, China.
Background: Sodium vanadium fluorophosphate is a sodium ion superconductor material with high sodium ion mobility and excellent cyclic stability, making it a promising cathode material for sodium-ion batteries. However, most of the literature and patents report preparation through traditional methods, which involve complex processes, large particle sizes, and low electronic conductivity, thereby limiting development progress.
Objective: Aiming at the limitation of high cost and poor performance of vanadium sodium fluorophosphate cathode material, the low temperature and high-efficiency nano preparation technology was developed.
Small
January 2025
Department of Physics, Malaviya National Institute of Technology Jaipur, Rajasthan, 302017, India.
Increasing attention to sustainability and cost-effectiveness in energy storage sector has catalyzed the rise of rechargeable Zinc-ion batteries (ZIBs). However, finding replacement for limited cycle-life Zn-anode is a major challenge. Molybdenum disulfide (MoS), an insertion-type 2D layered material, has shown promising characteristics as a ZIB anode.
View Article and Find Full Text PDFSmall
January 2025
Research Institute for Sustainable Energy (RISE), TCG-CREST, Salt Lake, Kolkata, 700091, India.
Advancing next-generation battery technologies requires a thorough understanding of the intricate phenomena occurring at anodic interfaces. This focused review explores key interfacial processes, examining their thermodynamics and consequences in ion transport and charge transfer kinetics. It begins with a discussion on the formation of the electro chemical double layer, based on the GuoyChapman model, and explores how charge carriers achieve equilibrium at the interface.
View Article and Find Full Text PDFACS Appl Mater Interfaces
January 2025
Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States.
Conversion electrodes, such as antimony (Sb), are high energy density electrode materials for sodium-ion batteries (NIBs). These materials are limited in their performance due to the mechanical instability of these systems resulting from volume expansion of the material during cycling. Stabilizing conversion materials using a conductive polymer binder (CPB) protective layer is an effective way to enhance the performance of these materials.
View Article and Find Full Text PDFAcc Chem Res
January 2025
Department of Chemistry, The University of Manchester, Manchester M13 9PL, United Kingdom.
ConspectusThe emergence of two-dimensional (2D) materials, such as graphene, transition-metal dichalcogenides (TMDs), and hexagonal boron nitride (h-BN), has sparked significant interest due to their unique physicochemical, optical, electrical, and mechanical properties. Furthermore, their atomically thin nature enables mechanical flexibility, high sensitivity, and simple integration onto flexible substrates, such as paper and plastic.The surface chemistry of a nanomaterial determines many of its properties, such as its chemical and catalytic activity.
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