This 2D layered material had been considered before as a candidate for anodes, but tests showed that its electrochemical performance was far below its theoretical potential. A Black Phosphorus-Graphite Composite Anode for Li-/Na-/K-Ion Batteries Black phosphorus (BP) is a desirable anode material for alkali metal ion storage owing to its high electronic/ionic conductivity and theoretical capacity. One reason for the shortfall is that the material’s structure deforms during battery operation. Two-dimensional black phosphorus (2D BP) possesses huge potential in electrochemical energy storage field owing to its unique electronic structure, high charge carrier mobility, and large interlayer spacing. Compared with red and white allotropes of phosphorus‚ black phosphorus is a more thermodynamically stable semiconductor material. In‐depth understanding of the redox reactions between BP and the alkali metal ions is key to reveal the potential and limitations of BP, and thus to guide the design of BP‐based composites for high‐performance alkali metal ion batteries. By combining black phosphorous with graphite, Ji, Duan and colleagues showed that the chemical bonds between the two materials stabilize the edge structure and prevent unwanted edge changes. Maximizing the performance of all these materials at the same time is a longstanding goal of battery research, yet in practice, improvements in one usually comes at the expense of the others. (Image credit: Dong Yihan, SHI Qianhui and Liang Yan), Advanced Light Microscopy and Spectroscopy (ALMS) Lab, Electron Imaging Center for Nanomachines (EICN), Integrated NanoMaterials Laboraotry (INML), Molecular Screening Shared Resource (MSSR), Nano and Pico Characterization Laboratory (NPC), Nanoscience Workshop for Teachers Program. Black phosphorus is an allotrope of white phosphorus, and it is an electrode material with great potential to meet the requirements of fast charging. Black phosphorus is the thermodynamically stable form of phosphorus at room temperature and pressure, with a heat of formation of -39.3 kJ/mol (relative to white phosphorus which is defined as the standard state). During operation, these ions move back and forth between the anode and cathode through an electrolyte as part of the battery’s charge-discharge cycle. For context, an anode material that can charge at 13 A/g with a reversible capacity of 440 mA.hour/g implies that an advanced lithium-ion battery made with this technology could be charged in less than 10 minutes. Lithium ions are the workhorse in many common battery applications, including electric vehicles. “If scalable production can be achieved, this material may provide an alternative, updated graphite anode, and move us toward a lithium-ion battery with an energy density of higher than 350 watts-hour per kilogram,” says Sen Xin, a researcher at the Institute of Chemistry, Chinese Academy of Sciences, and one of the study’s co-first authors.This figure, he adds, means that an electric vehicle equipped with such a battery could travel 600 miles on a single charge – making it competitive with conventional combustion-engine vehicles. A single elemental hybrid composed of black phosphorus (BP) and red phosphorus (RP) is synthesized via a feasible sonochemical method. Researchers led by Ji at USTC and Xiangfeng Duan at the University of California, Los Angeles, made their new anode material by combining graphite with black phosphorus. This deformation, which begins at the edges of the black phosphorus layers, reduces the material’s quality to such an extent that lithium ions cannot easily transfer through it. This 2D layered material had been considered before as a candidate for anodes, but tests showed that its electrochemical performance was far below its theoretical potential. Recommended for you. Tel: (310) 267-4838 Full details of the research are published in Science. To overcome the continued formation and build-up of an ionically less conductive solid-electrolyte interphase, the team applied a thin polyaniline gel coating to the electrode materials – a strategy that also reinforced the transport path for lithium ions. Since the discovery of graphene, interest in 2D … However, its practical application is hindered by large volume change of BP and poor mechanical stability of BP anodes by traditional slurry casting technology. If you'd like to change your details at any time, please visit My account. Abstract and Figures Two-dimensional black phosphorus (2D BP), an emerging material, has aroused tremendous interest once discovered. By way of comparison, the Tesla Model S can travel 400 miles on one charge. We report use of black phosphorus (BP) as the active anode for high-rate, high-capacity Li storage. They found that their test devices had reversible capacities of 910 mA.hour/g, 790 mA.hour/g  and 440 mA.hour/g after more than 2000 cycles at 2.6 A/g, 5.2 A/g and 13 A/g, respectively. 570 Westwood Plaza This 2D layered material had been considered before as a candidate for anodes, but tests showed that its electrochemical … However, a series of current studies have found that there is a certain gap between the comprehensive performance indicators of black phosphorus … Fax: (310) 267-4918, Copyright © 2020 California NanoSystems Institute, The black phosphorus composite material connected by carbon-phosphorus covalent bonds has a more stable structure and a higher lithium ion storage capacity. As a result, the increase in battery capacity usually leads to a long charging time, which represents a critical roadblock for more widespread adoption of EVs.”. Engineered electrode material moves battery development closer to fast charging by University of Science and Technology of China The black phosphorous composite â ¦ Black phosphorus, which is a relatively rare allotrope of phosphorus, was first discovered by Bridgman in 1914. “For example, anode materials with high lithium storage capacity, such as silicon, are usually reported as having low lithium-ion conductivity, which hinders fast battery [charging]. The new research was published in the Journal Science. The website forms part of the Physics World portfolio, a collection of online, digital and print information services for the global scientific community. Credit: DONG Yihan, SHI Qianhui and LIANG Yan A new electrode material could make it possible to construct lithium-ion batteries with a high charging rate and storage capacity. 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