Nonpolarizing oxygen-redox capacity without O-O dimerization in Na2Mn3O7

AbstractReversibility of an electrode reaction is important for energy-efficient rechargeable batteries with a long battery life. Additional oxygen-redox reactions have become an intensive area of research to achieve a larger specific capacity of the positive electrode materials. However, most oxygen-redox electrodes exhibit a large voltage hysteresis >0.5 V upon charge/discharge, and hence possess unacceptably poor energy efficiency. The hysteresis is thought to originate from the formation of peroxide-like O22− dimers during the oxygen-redox reaction. Therefore, avoiding O-O dimer formation is an essential challenge to overcome. Here, we focus on Na2-xMn3O7, which we recently identified to exhibit a large reversible oxygen-redox capacity with an extremely small polarization of 0.04 V. Using spectroscopic and magnetic measurements, the existence of stable O−• was identified in Na2-xMn3O7. Computations reveal that O−• is thermodynamically favorable over the peroxide-like O22− dimer as a result of hole stabilization through a (σ + π) multiorbital Mn-O bond.

Download Full-text

Nanohollow Carbon for Rechargeable Batteries: Ongoing Progresses and Challenges

Nano-Micro Letters ◽

10.1007/s40820-020-00521-2 ◽

2020 ◽

Vol 12 (1) ◽

Author(s):

Jiangmin Jiang ◽

Guangdi Nie ◽

Ping Nie ◽

Zhiwei Li ◽

Zhenghui Pan ◽

...

Keyword(s):

Electrochemical Performance ◽

Carbon Nanostructures ◽

Active Sites ◽

Electrode Materials ◽

Mechanical Stability ◽

High Surface ◽

Specific Capacity ◽

Rate Capability ◽

Lithium Ion ◽

Rechargeable Batteries

AbstractAmong the various morphologies of carbon-based materials, hollow carbon nanostructures are of particular interest for energy storage. They have been widely investigated as electrode materials in different types of rechargeable batteries, owing to their high surface areas in association with the high surface-to-volume ratios, controllable pores and pore size distribution, high electrical conductivity, and excellent chemical and mechanical stability, which are beneficial for providing active sites, accelerating electrons/ions transfer, interacting with electrolytes, and giving rise to high specific capacity, rate capability, cycling ability, and overall electrochemical performance. In this overview, we look into the ongoing progresses that are being made with the nanohollow carbon materials, including nanospheres, nanopolyhedrons, and nanofibers, in relation to their applications in the main types of rechargeable batteries. The design and synthesis strategies for them and their electrochemical performance in rechargeable batteries, including lithium-ion batteries, sodium-ion batteries, potassium-ion batteries, and lithium–sulfur batteries are comprehensively reviewed and discussed, together with the challenges being faced and perspectives for them.

Download Full-text

High specific capacity and excellent stability of interface-controlled MWCNT based anodes in lithium ion battery

MRS Proceedings ◽

10.1557/opl.2011.1392 ◽

2011 ◽

Vol 1313 ◽

Author(s):

Indranil Lahiri ◽

Sung-Woo Oh ◽

Yang-Kook Sun ◽

Wonbong Choi

Keyword(s):

Electrode Materials ◽

Specific Capacity ◽

High Energy ◽

Rechargeable Batteries ◽

Operating Voltage ◽

Li Ion Batteries ◽

High Specific Capacity ◽

Capacity Degradation ◽

Li Ion ◽

Very High

ABSTRACTRechargeable batteries are in high demand for future hybrid vehicles and electronic devices markets. Among various kinds of rechargeable batteries, Li-ion batteries are most popular for their obvious advantages of high energy and power density, ability to offer higher operating voltage, absence of memory effect, operation over a wider temperature range and showing a low self-discharge rate. Researchers have shown great deal of interest in developing new, improved electrode materials for Li-ion batteries leading to higher specific capacity, longer cycle life and extra safety. In the present study, we have shown that an anode prepared from interface-controlled multiwall carbon nanotubes (MWCNT), directly grown on copper current collectors, may be the best suitable anode for a Li-ion battery. The newly developed anode structure has shown very high specific capacity (almost 2.5 times as that of graphite), excellent rate capability, nil capacity degradation in long-cycle operation and introduced a higher level of safety by avoiding organic binders. Enhanced properties of the anode were well supported by the structural characterization and can be related to very high Li-ion intercalation on the walls of CNTs, as observed in HRTEM. This newly developed CNT-based anode structure is expected to offer appreciable advancement in performance of future Li-ion batteries.

Download Full-text

Penta-BCN monolayer with high specific capacity and mobility as a compelling anode material for rechargeable batteries

Physical Chemistry Chemical Physics ◽

10.1039/d1cp03017e ◽

2021 ◽

Author(s):

Lei Chen ◽

Yang MinRui ◽

Kong Fan ◽

Wenling Du ◽

Jiyuan Guo ◽

...

Keyword(s):

Anode Material ◽

First Principles ◽

Metal Ion ◽

Electrode Materials ◽

Specific Capacity ◽

High Capacity ◽

Rechargeable Batteries ◽

First Principles Calculations ◽

High Specific Capacity ◽

Increasing Demand

With the increasing demand for sustainable and clean energies, seeking high-capacity density electrode materials applied in the rechargeable metal-ion batteries is urgent. In this work, using first-principles calculations, we evaluate...

Download Full-text

Flexible α-Fe2O3 nanorod electrode materials for sodium-ion batteries with excellent cycle performance

Functional Materials Letters ◽

10.1142/s1793604718400027 ◽

2018 ◽

Vol 11 (06) ◽

pp. 1840002 ◽

Cited By ~ 6

Author(s):

Depeng Zhao ◽

Di Xie ◽

Hengqi Liu ◽

Fang Hu ◽

Xiang Wu

Keyword(s):

Electrochemical Performance ◽

Flexible Electronics ◽

Electrode Materials ◽

Specific Capacity ◽

Rechargeable Batteries ◽

Sodium Ion ◽

Cycle Performance ◽

Carbon Cloth ◽

Sodium Ion Batteries ◽

Performance Measurements

With the rise of flexible electronics, flexible rechargeable batteries have attracted widespread attention as a promising power source in new generation flexible electronic devices. In this work, [Formula: see text]-Fe2O3 nanorods grown on carbon cloth have been synthesized through a facile hydrothermal method as binder-free electrode material. The electrochemical performance measurements show that [Formula: see text]-Fe2O3 nanorods possess high specific capacitance and specific capacity retention of 119% after 100 cycles. The combination of low-cost and excellent electrochemical performance makes [Formula: see text]-Fe2O3 nanorods promising anode materials for sodium-ion batteries.

Download Full-text

Investigation of structure and electrochemical properties of layered structure NaFexMn1-xO2

Science and Technology Development Journal - Natural Sciences ◽

10.32508/stdjns.v3i4.573 ◽

2020 ◽

Vol 3 (4) ◽

pp. 317-325

Author(s):

Nguyen Thi Kieu Duyen ◽

Huynh Le Thanh Nguyen ◽

Nguyen Thi Thu Trang ◽

Le My Loan Phung ◽

Tran Van Man

Keyword(s):

Layered Structure ◽

Electrode Materials ◽

Low Cost ◽

Specific Capacity ◽

Rechargeable Batteries ◽

Lattice Parameters ◽

Constant Current ◽

Metallic Sodium ◽

Layered Oxides ◽

Unit Cells

Layered oxides are promising electrode materials for sodium-ion batteries, the next generation of rechargeable batteries. The layered oxides with the tránition metallic manganese and iron have paid more attention due to its low-cost, eco-friendly, and facile preparation. In this work, the metallic sodium oxides with a layered structure based on Fe and Mn, NaFexMn1-xO2 (x = 1/3, 1/2 và 2/3) were synthesized via a solid-state reaction at 900 oC for 12–36 hours. All XRD patterns of NaFexMn1-xO2 pointed out the layered structure. In two ratio Fe:Mn = 1/3:2/3 and 1/2:1/2, the synthesized samples presented the P3-layered structure, while in ratio Fe:Mn = 2/3:1/3, the O3-structure was obtained. The lattice parameters were determined by Celref software. The lattice parameters and the volumic of unit cells depended on the ionic radius of cation Mn3+ and Fe3+. The Na-migration was studied by the cycling test with a constant current. The charge-discharge curves and the specific capacity depended on the ratio of Fe:Mn. The specific capacity was found out 120 mAh/g (1/2:1/2), 118 mAh/g (2/3:1/3), and 120 mAh/g (1/3:2/3). After 20 cycles, the capacity was maintained 77 mAh/g (1/2:1/2), 88 mAh/g (2/3:1/3), and 80 mAh/g (1/3:2/3).

Download Full-text

Bi4V2O11 and related compounds as positive electrode materials for lithium rechargeable batteries

Solid State Ionics ◽

10.1016/s0167-2738(96)00444-4 ◽

1996 ◽

Vol 91 (3-4) ◽

pp. 273-278 ◽

Cited By ~ 4

Author(s):

M y de Dompablo

Keyword(s):

Electrode Materials ◽

Rechargeable Batteries ◽

Positive Electrode ◽

Lithium Rechargeable Batteries ◽

Related Compounds ◽

Positive Electrode Materials

Download Full-text

Controlled Nanostructuration of Cobalt Oxyhydroxide Electrode Material for Hybrid Supercapacitors

Materials ◽

10.3390/ma14092325 ◽

2021 ◽

Vol 14 (9) ◽

pp. 2325

Author(s):

Ronan Invernizzi ◽

Liliane Guerlou-Demourgues ◽

François Weill ◽

Alexia Lemoine ◽

Marie-Anne Dourges ◽

...

Keyword(s):

Ionic Liquid ◽

Ionic Liquids ◽

Energy Storage ◽

Specific Surface ◽

Electrode Materials ◽

Specific Capacity ◽

Hybrid Supercapacitors ◽

Cobalt Oxyhydroxide ◽

Precipitation Medium ◽

The Impact

Nanostructuration is one of the most promising strategies to develop performant electrode materials for energy storage devices, such as hybrid supercapacitors. In this work, we studied the influence of precipitation medium and the use of a series of 1-alkyl-3-methylimidazolium bromide ionic liquids for the nanostructuration of β(III) cobalt oxyhydroxides. Then, the effect of the nanostructuration and the impact of the different ionic liquids used during synthesis were investigated in terms of energy storage performances. First, we demonstrated that forward precipitation, in a cobalt-rich medium, leads to smaller particles with higher specific surface areas (SSA) and an enhanced mesoporosity. Introduction of ionic liquids (ILs) in the precipitation medium further strongly increased the specific surface area and the mesoporosity to achieve well-nanostructured materials with a very high SSA of 265 m2/g and porosity of 0.43 cm3/g. Additionally, we showed that ILs used as surfactant and template also functionalize the nanomaterial surface, leading to a beneficial synergy between the highly ionic conductive IL and the cobalt oxyhydroxide, which lowers the resistance charge transfer and improves the specific capacity. The nature of the ionic liquid had an important influence on the final electrochemical properties and the best performances were reached with the ionic liquid containing the longest alkyl chain.

Download Full-text

Advances in the Applications of Graphene-Based Nanocomposites in Clean Energy Materials

Crystals ◽

10.3390/cryst11010047 ◽

2021 ◽

Vol 11 (1) ◽

pp. 47

Author(s):

Yiqiu Xiang ◽

Ling Xin ◽

Jiwei Hu ◽

Caifang Li ◽

Jimei Qi ◽

...

Keyword(s):

Solar Cells ◽

Fuel Cells ◽

Lithium Ion Batteries ◽

Electrode Materials ◽

Specific Capacity ◽

Lithium Ion ◽

Clean Energy ◽

Proton Exchange ◽

Energy Storage And Conversion ◽

Thermoelectric Conversion

Extensive use of fossil fuels can lead to energy depletion and serious environmental pollution. Therefore, it is necessary to solve these problems by developing clean energy. Graphene materials own the advantages of high electrocatalytic activity, high conductivity, excellent mechanical strength, strong flexibility, large specific surface area and light weight, thus giving the potential to store electric charge, ions or hydrogen. Graphene-based nanocomposites have become new research hotspots in the field of energy storage and conversion, such as in fuel cells, lithium-ion batteries, solar cells and thermoelectric conversion. Graphene as a catalyst carrier of hydrogen fuel cells has been further modified to obtain higher and more uniform metal dispersion, hence improving the electrocatalyst activity. Moreover, it can complement the network of electroactive materials to buffer the change of electrode volume and prevent the breakage and aggregation of electrode materials, and graphene oxide is also used as a cheap and sustainable proton exchange membrane. In lithium-ion batteries, substituting heteroatoms for carbon atoms in graphene composite electrodes can produce defects on the graphitized surface which have a good reversible specific capacity and increased energy and power densities. In solar cells, the performance of the interface and junction is enhanced by using a few layers of graphene-based composites and more electron-hole pairs are collected; therefore, the conversion efficiency is increased. Graphene has a high Seebeck coefficient, and therefore, it is a potential thermoelectric material. In this paper, we review the latest progress in the synthesis, characterization, evaluation and properties of graphene-based composites and their practical applications in fuel cells, lithium-ion batteries, solar cells and thermoelectric conversion.

Download Full-text

Sulfurized Polyacrylonitrile for High-Performance Lithium Sulfur Batteries: Advances and Prospects

Journal of Materials Chemistry A ◽

10.1039/d1ta03300j ◽

2021 ◽

Author(s):

Xiaohui Zhao ◽

Chonglong Wang ◽

Ziwei Li ◽

Xuechun Hu ◽

Amir A. Razzaq ◽

...

Keyword(s):

Energy Density ◽

High Performance ◽

Specific Capacity ◽

Rechargeable Batteries ◽

Next Generation ◽

Lithium Sulfur Batteries ◽

Theoretical Specific Capacity ◽

Lithium Sulfur

The lithium sulfur (Li-S) batteries have a high theoretical specific capacity (1675 mAh g-1) and energy density (2600 Wh kg-1), exerting a high perspective as the next-generation rechargeable batteries for...

Download Full-text