scholarly journals Flexible Films as Anode Materials Based on rGO and TiO2/MnO2 in Li-Ion Batteries Free of Non-Active Agents

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 8168
Author(s):  
Tomasz Kędzierski ◽  
Daria Baranowska ◽  
Damian Bęben ◽  
Beata Zielińska ◽  
Xuecheng Chen ◽  
...  
Keyword(s):  
Thin Films ◽  
Flexible Substrate ◽  
Active Material ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Wearable Electronics ◽  
Free Standing ◽  
Filtration Method ◽  
Worldwide Distribution ◽  
Volume Weight

Recently, to meet the growing demand for stable and flexible batteries, anodes in the form of thin films have drawn the attention of researchers. It is clear that mass production of such batteries would bring the worldwide distribution of flexible devices and wearable electronics closer. Currently, electrodes are deposited on a flexible substrate and consist of conductive and binding agents that increase the volume/weight of the electrode. Here, we propose free-standing and non-active-material-free thin films based on reduced graphene oxide (rGO), titanium dioxide (TiO2) and manganese dioxide (MnO2) as working electrodes in lithium-ion half-cells prepared via the vacuum-assisted filtration method. The electrochemical performance of the assembled half-cells exhibited good cyclic stability and a reversible capacity at lower current densities. The addition of TiO2 and MnO2 improved the capacity of the rGO film, while rGO itself provided a stable rate performance. rGO/TiO2/MnO2 film showed the highest discharge capacity (483 mAh/g at 50 mA/g). In addition, all assembled cells displayed excellent repeatability and reversibility in cyclic voltammetry measurements and good lithium-ion diffusion through the electrolyte, SEI layer and the active material itself.

scholarly journals Low Reversible Capacity of Nitridated Titanium Electrical Terminals

Batteries ◽  
2019 ◽  
Vol 5 (1) ◽  
pp. 17 ◽  
Author(s):  
David Klein ◽  
Yaolin Xu ◽  
Robert Schlögl ◽  
Sébastien Cap
Keyword(s):  
Thin Films ◽  
Active Material ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Differential Capacity ◽  
Active Materials ◽  
Experimental Conditions ◽  
Manufacturing Method ◽  
Planar Substrate ◽  
Materials Used

The currently preferred manufacturing method for Lithium-ion battery (LIB) electrodes is via the slurry route. While such an approach is appealing, the complexity of the electrode layers containing the active materials, conductivity helpers, and binders, has hampered detailed investigations of the active materials. As an alternative, an active material can be deposited as a thin film on a planar substrate, which enables a more robust and detailed analysis. However, due to the small areal capacity of nanometric thin films, the electrochemical activity of the cell casing must be negligible or at least well determined. We reported on the capacity and the differential capacity metrics of several materials used in the construction of the electrical terminals in LIBs. Among these materials, Ti was revealed to have the minimum reversible capacity for lithium-ion storage. The mechanical and electrochemical properties of the Ti–based materials were further improved through surface nitridation with thermal treatment in an ammonia-rich atmosphere. The nitridated Ti electrical terminal achieved a reversible capacity that was at least fifteen times lower than that of stainless steel, with a featureless differential capacity representation creating quasi-ideal experimental conditions for a detailed investigation of electroactive thin films.

A Facile One-Pot Stepwise Hydrothermal Method for the Synthesis of 3D MoS2/RGO Composites with Improved Lithium Storage Properties

NANO ◽  
2019 ◽  
Vol 14 (03) ◽  
pp. 1950037 ◽  
Author(s):  
Bingning Wang ◽  
Xuehua Liu ◽  
Binghui Xu ◽  
Yanhui Li ◽  
Dan Xiu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electrochemical Performance ◽  
Hydrothermal Method ◽  
Hydrothermal Treatment ◽  
Active Material ◽  
Rate Capability ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Lithium Storage ◽  
One Pot

Three-dimensional reduced graphene oxide (RGO) matrix decorated with nanoflowers of layered MoS2 (denoted as 3D MoS2/RGO) have been synthesized via a facile one-pot stepwise hydrothermal method. Graphene oxide (GO) is used as precursor of RGO and a 3D GO network is formed in the first-step of hydrothermal treatment. At the second stage of hydrothermal treatment, nanoflowers of layered MoS2 form and anchor on the surface of previously formed 3D RGO network. In this preparation, thiourea not only induces the formation of the 3D architecture at a relatively low temperature, but also works as sulfur precursor of MoS2. The synthesized composites have been investigated with XRD, SEM, TEM, Raman spectra, TGA, N2 sorption technique and electrochemical measurements. In comparison with normal MoS2/RGO composites, the 3D MoS2/RGO composite shows improved electrochemical performance as anode material for lithium-ion batteries. A high reversible capacity of 930[Formula: see text]mAh[Formula: see text][Formula: see text][Formula: see text]g[Formula: see text] after 130 cycles under a current density of 200[Formula: see text]mA[Formula: see text][Formula: see text][Formula: see text]g[Formula: see text] as well as good rate capability and superior cyclic stability have been observed. The superior electrochemical performance of the 3D MoS2/RGO composite as anode active material for lithium-ion battery is ascribed to its robust 3D structures, enhanced surface area and the synergistic effect between graphene matrix and the MoS2 nanoflowers subunit.

MoS2 Layers Decorated RGO Composite Prepared by a One-Step High-Temperature Solvothermal Method as Anode for Lithium-Ion Batteries

NANO ◽  
2018 ◽  
Vol 13 (11) ◽  
pp. 1850135 ◽  
Author(s):  
Xuehua Liu ◽  
Bingning Wang ◽  
Jine Liu ◽  
Zhen Kong ◽  
Binghui Xu ◽  
...  
Keyword(s):  
High Temperature ◽  
Lithium Ion Batteries ◽  
Active Material ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cost Effective ◽  
Reversible Capacity ◽  
Reduced Graphene ◽  
One Step ◽  
Anode Active Material

A one-step high-temperature solvothermal approach to the synthesis of monolayer or bilayer MoS2 anchored onto reduced graphene oxide (RGO) sheet (denoted as MoS2/RGO) is described. It was found that single-layered or double-layered MoS2 were synthesized directly without an extra exfoliation step and well dispersed on the surface of crumpled RGO sheets with random orientation. The prepared MoS2/RGO composites delivered a high reversible capacity of 900[Formula: see text]mAhg[Formula: see text] after 200 cycles at a current density of 200[Formula: see text]mAg[Formula: see text] as well as good rate capability as anode active material for lithium ion batteries. This one-step high-temperature hydrothermal strategy provides a simple, cost-effective and eco-friendly way to the fabrication of exfoliated MoS2 layers deposited onto RGO sheets.

scholarly journals Characterization of Sn4P3–Carbon Composite Films for Lithium-Ion Battery Anode Fabricated by Aerosol Deposition

Nanomaterials ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 1032 ◽  
Author(s):  
Toki Moritaka ◽  
Yuh Yamashita ◽  
Tomohiro Tojo ◽  
Ryoji Inada ◽  
Yoji Sakurai
Keyword(s):  
Electrochemical Performance ◽  
Composite Film ◽  
Lithium Ion Battery ◽  
Active Material ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Aerosol Deposition ◽  
Raw Material ◽  
Composite Powders ◽  
Battery Anode

We fabricated tin phosphide–carbon (Sn4P3/C) composite film by aerosol deposition (AD) and investigated its electrochemical performance for a lithium-ion battery anode. Sn4P3/C composite powders prepared by a ball milling was used as raw material and deposited onto a stainless steel substrate to form the composite film via impact consolidation. The Sn4P3/C composite film fabricated by AD showed much better electrochemical performance than the Sn4P3 film without complexing carbon. Although both films showed initial discharge (Li+ extraction) capacities of approximately 1000 mAh g−1, Sn4P3/C films retained higher reversible capacity above 700 mAh g−1 after 100 cycles of charge and discharge processes while the capacity of Sn4P3 film rapidly degraded with cycling. In addition, by controlling the potential window in galvanostatic testing, Sn4P3/C composite film retained the reversible capacity of 380 mAh g−1 even after 400 cycles. The complexed carbon works not only as a buffer to suppress the collapse of electrodes by large volume change of Sn4P3 in charge and discharge reactions but also as an electronic conduction path among the atomized active material particles in the film.

scholarly journals Mexican Onyx Waste as Active Material and Active Material’s Precursor for Conversion Anodes of Lithium Ion Batteries

2021 ◽  
Vol 9 ◽  
Author(s):  
Enrique Quiroga-González ◽  
Emma Morales-Merino
Keyword(s):  
Active Material ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Li Ion Batteries ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Li Ion ◽  
Reducing Costs ◽  
First Time ◽  
Better Than

For the first time a limestone has been used as active material or active material’s precursor for electrodes of Li ion batteries. Limestones are very abundant, what is a condition for a sustainable development of energy storage devices. Mexican onyx has been used as a model of limestone in this work, mainly composed of calcite (calcium carbonate). Waste powder of this material from handcraft production was used, reducing costs. The material was carbonized and pyrolyzed, producing calcium oxide covered with carbon. Mexican onyx either treated or untreated works well as anode material for Li ion batteries, storing charges by conversion. Despite the grains of this material were as big as 50 μm, the material with no treatment showed a maximum Li storage capacity of 530.16 mAh/g at C/3.3, while the pyrolyzed one showed a maximum reversible capacity of 220 mAh/g at 1.37C and of 158 mAh/g at 5.48C, performance even better than the performance of graphite.

Electrochemical Properties of Advanced Anodes for Lithium-Ion Batteries Based on Carboxymethylcellulose as Binder

2013 ◽  
Vol 559 ◽  
pp. 49-55
Author(s):  
Volodymyr Khomenko ◽  
Viacheslav Barsukov ◽  
Ilona Senyk
Keyword(s):  
Electrochemical Properties ◽  
Active Material ◽  
Lithium Ion ◽  
Current Collector ◽  
Reversible Capacity ◽  
Water Soluble ◽  
Green Technologies ◽  
Carbon Coated ◽  
Improved Performance ◽  
Discharge Test

Electrochemical properties and possibilities of manufacturing the anodes based on water-soluble binders such as carboxymethylcellulose (CMC) have been investigated in order to create prerequisites for development of “green” technologies for recyclability of LIBs components. In this work an advanced anode was designed. A kind of nanosized carbon coated Si composite was synthesized. The charge/discharge test reveals that the advanced anode shows a reversible capacity of 600 mAh/g. The improved performance was ascribed to the carbon shell of Si and CMC binder. The binder CMC buffers the expansion of the Si and the improved electric contact between the active material and copper current collector.

scholarly journals Application of Carbonized Starches as Carbon Electrode Active Material Compared to Graphene Nanoplatelets-Based Anode in a Lithium-Ion Cell

2021 ◽  
Author(s):  
Marita Pigłowska ◽  
Beata Kurc ◽  
Łukasz Rymaniak
Keyword(s):  
High Performance ◽  
Active Material ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Graphene Nanoplatelets ◽  
Rational Engineering ◽  
Lithium Ion Cells ◽  
Lithium Ion Cell ◽  
Primary Focus

AbstractThe main aim of this research is the examination of the physicochemical properties and their impact on the electrochemical activity of carbon materials obtained from the starch of different botanical origin (SCs). The obtained materials are compared to graphene nanoplatelets (GNPs) of different particle sizes (5 and 25 µm) applied as an anode active material for high-performance lithium-ion cells. SCs were obtained via thermal carbonization and this process enables an obtainment of better sorption properties compared to GNPs. The excellent electrochemical properties are mainly attributed to the good DLi+ (3.03 × 10−13–7.64 × 10−11 cm2 s−1 for SCs and 7.60 × 10−13–5.42 × 10−12 cm2 s−1 for GNPs) and relatively small resistances (EIS). However, the primary focus is on the specific capacity and cyclability. The capacity retentions of CSC cycled at 1 mA g−1, 10 mA g−1, 50 mA g−1, 1 mA g−1 for 50 cycles are 98%, 99%, 96%, 94% with specific capacities equal to 820, 800, 790, 1000 mAh g−1, respectively. The 5GNPs and 25GNPs may present a much smaller reversible capacity of 650, 600 mAh g−1 at 10 mA g−1. The thermal modification process of starches is simple, safe and widely applied, providing new paths for rational engineering of anode materials for LIBs. Moreover, the applied materials are easily available worldwide and are promising in the well-known Green Chemistry aspect making the cells more biodegradable. Graphic Abstract

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