Electrode Properties of Defect-Introduced Graphenes for Lithium-Ion Batteries

2013 ◽  
Vol 582 ◽  
pp. 103-106
Author(s):  
Wonk Yun Lee ◽  
Shinya Suzuki ◽  
Masaru Miyayama
Keyword(s):  
Lithium Ion Batteries ◽  
Current Density ◽  
Lithium Ion ◽  
Graphene Sheets ◽  
Oxidizing Agent ◽  
Lithium Storage ◽  
Charge Capacity ◽  
Oxidized Graphite ◽  
A Current ◽  
Graphite Oxides

Electrochemical properties of defect-introduces graphenes for lithium ion batteries were investigated. Graphene sheets (GSs) were prepared from graphite through treating with oxidizing agent followed by rapid thermal exfoliation. Defect concentration was controlled by selecting the number of times of oxidation of graphite. GSs electrodes derived from 1, 2 and 3 times-oxidized graphite oxides exhibited a high charge capacity of 1250, 1790 and 2310 mAh g1, respectively, at the 20th cycle at a current density of 100 mA g1. The enhanced capacity is assumed to be due to additional lithium storage sites such as defects and edges.

scholarly journals Nitrogen-doped carbon-encapsulated SnO2–SnS/graphene sheets with improved anodic performance in lithium ion batteries

2015 ◽  
Vol 3 (47) ◽  
pp. 24148-24154 ◽  
Author(s):  
Jieqiong Shan ◽  
Yuxin Liu ◽  
Ping Liu ◽  
Yanshan Huang ◽  
Yuezeng Su ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Current Density ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Graphene Sheets ◽  
Core Shell ◽  
High Specific Capacity ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon ◽  
A Current

A dual-doping approach for N–C@SnO2–SnS/GN with 2D core–shell architecture has been developed. Used as the anode material in LIBs, it delivers a high specific capacity of 1236 mA h g−1 at a current density of 0.1 A g−1 after 110 cycles.

scholarly journals Flake (NH4)6Mo7O24/Polydopamine as a High Performance Anode for Lithium Ion Batteries

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1115
Author(s):  
Ying Xie ◽  
Xiang Xiong ◽  
Kai Han
Keyword(s):  
Lithium Ion Batteries ◽  
Discharge Capacity ◽  
Current Density ◽  
High Performance ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Ammonium Molybdate ◽  
Drying Methods ◽  
Lithium Storage ◽  
A Current

Ammonium molybdate tetrahydrate ((NH4)6Mo7O24) (AMT) is commonly used as the precursor to synthesize Mo-based oxides or sulfides for lithium ion batteries (LIBs). However, the electrochemical lithium storage ability of AMT itself is unclear so far. In the present work, AMT is directly examined as a promising anode material for Li-ion batteries with good capacity and cycling stability. To further improve the electrochemical performance of AMT, AMT/polydopamine (PDA) composite was simply synthesized via recrystallization and freeze drying methods. Unlike with block shape for AMT, the as-prepared AMT/PDA composite shows flake morphology. The initial discharge capacity of AMT/PDA is reached up to 1471 mAh g−1. It delivers a reversible discharge capacity of 702 mAh g−1 at a current density of 300 mA g−1, and a stable reversible capacity of 383.6 mA h g−1 is retained at a current density of 0.5 A g−1 after 400 cycles. Moreover, the lithium storage mechanism is fully investigated. The results of this work could potentially expand the application of AMT and Mo-based anode for LIBs.

High Reversible Capacity of Nitrogen-Doped Graphene as an Anode Material for Lithium-Ion Batteries

2014 ◽  
Vol 1070-1072 ◽  
pp. 459-464
Author(s):  
Chang Jing Fu ◽  
Shuang Li ◽  
Qian Wang
Keyword(s):  
Graphene Oxide ◽  
Electron Microscope ◽  
Lithium Ion Batteries ◽  
Current Density ◽  
Lithium Ion ◽  
X Ray ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
A Current

Nitrogen-doped graphene (N-rGO) was synthesized in the process of preparation of reduced graphene oxide from the expanded graphite through the improved Hummers’ method. The morphology, structure and composition of nitrogen-doped graphene oxide (GO) and N-rGO were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The nitrogen content of N-rGO was approximately 5 at.%. The electrochemical performances of N-rGO as anode materials for lithium-ion batteries were evaluated in coin-type cells versus metallic lithium. Results showed that the obtained N-rGO exhibited a higher reversible specific capacity of 519 mAh g-1 at a current density of 100 mA⋅g-1 and 207.5 mAh⋅g-1 at a current density of 2000 mA⋅g-1. The excellent cycling stability and high-rate capability of N-rGO as anodes of lithium-ion battery were attributed to the large number of surface defects caused by the nitrogen doping, which facilitates the fast transport of Li-ion and electron on the interface of electrolyte/electrode.

scholarly journals Carbon nanotube-wrapped Fe2O3 anode with improved performance for lithium-ion batteries

2017 ◽  
Vol 8 ◽  
pp. 649-656 ◽  
Author(s):  
Guoliang Gao ◽  
Yan Jin ◽  
Qun Zeng ◽  
Deyu Wang ◽  
Cai Shen
Keyword(s):  
Hydrothermal Synthesis ◽  
Lithium Ion Batteries ◽  
Anode Material ◽  
Electronic Conductivity ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Practical Application ◽  
Lithium Storage ◽  
Improved Performance ◽  
A Current

Metall oxides have been proven to be potential candidates for the anode material of lithium-ion batteries (LIBs) because they offer high theoretical capacities, and are environmentally friendly and widely available. However, the low electronic conductivity and severe irreversible lithium storage have hindered a practical application. Herein, we employed ethanolamine as precursor to prepare Fe2O3/COOH-MWCNT composites through a simple hydrothermal synthesis. When these composites were used as electrode material in lithium-ion batteries, a reversible capacity of 711.2 mAh·g−1 at a current density of 500 mA·g−1 after 400 cycles was obtained. The result indicated that Fe2O3/COOH-MWCNT composite is a potential anode material for lithium-ion batteries.

scholarly journals Polypyrrole Coated Mn–Fe Bimetallic Oxides as High Stability Anode for Lithium-ion Batteries

2021 ◽  
Author(s):  
Yuan Fang ◽  
Tengfei Li ◽  
Fen Wang ◽  
Jianfeng Zhu
Keyword(s):  
Metal Oxides ◽  
Lithium Ion Batteries ◽  
Volume Change ◽  
Current Density ◽  
Transition Metal Oxides ◽  
High Stability ◽  
Specific Capacity ◽  
Lithium Ion ◽  
High Specific Capacity ◽  
A Current

Abstract Transition metal oxides as anode materials have received extensive research owing to the high specific capacity. Whereas, the rapid decline of battery capacity caused by volume expansion and low electrical conductivity hinders the practical application of transition metal oxides. This study reported a pseudo-capacitance material polypyrrole coated Fe2O3/Mn2O3 composites material as a high stability anode for lithium-ion batteries. The polypyrrole coating layer can not only serve as a conductive network to improve electrode conductivity but also can be used as a protective buffer layer to suppress the volume change of Fe2O3/Mn2O3 during the charging and discharging process. At the same time, the porous structure of Fe2O3/Mn2O3 composite can not only provide more active sites for lithium storage but also play a certain buffer effect on the volume change of the material. Polypyrrole-coated Fe2O3/Mn2O3 composite as the anode for lithium-ion batteries shows great electrochemical storage performance, with high specific capacity (627 mAh g− 1 at a current density of 1A g− 1), great cycle stability (the capacity not shows obvious signs of attenuation after 500 cycles) and rate performance (432 mAh g− 1 at a current density of 2.0 A g− 1).

A 3D pore-nest structured silicon–carbon composite as an anode material for high performance lithium-ion batteries

2017 ◽  
Vol 4 (12) ◽  
pp. 1996-2004 ◽  
Author(s):  
Yankai Li ◽  
Zhi Long ◽  
Pengyuan Xu ◽  
Yang Sun ◽  
Kai Song ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Material ◽  
Current Density ◽  
High Performance ◽  
Lithium Ion ◽  
Carbon Composite ◽  
Nest Structure ◽  
Composite Anode ◽  
Silicon Carbon ◽  
A Current

A novel silicon–carbon composite with a 3D pore-nest structure denoted as Si@SiOx/CNTs@C was prepared and studied, and the capacity of a Si@SiOx/CNTs@C composite anode can be maintained at above 1740 mA h g−1 at a current density of 0.42 A g−1 after 700 cycles.

scholarly journals Boron-Doped Carbon Nano-/Microballs from Orthoboric Acid-Starch: Preparation, Characterization, and Lithium Ion Storage Properties

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Xinhua Lu ◽  
Lin Chen
Keyword(s):  
Current Density ◽  
Carbon Nanostructures ◽  
Hydrothermal Reaction ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Lithium Storage ◽  
Boron Doped ◽  
Specific Discharge ◽  
Boron Source ◽  
A Current

A boron-doped carbon nano-/microballs (BC) was successfully obtained via a two-step procedure including hydrothermal reaction (180°C) and carbonization (800°C) with cheap starch and H3BO3 as the carbon and boron source. As a new kind of boron-doped carbon, BC contained 2.03 at% B-content and presented the morphology as almost perfect nano-/microballs with different sizes ranging from 500 nm to 5 μm. Besides that, due to the electron deficient boron, BC was explored as anode material and presented good lithium storage performance. At a current density of 0.2 C, the first reversible specific discharge capacity of BC electrode reached as high as 964.2 mAh g–1 and kept at 699 mAh g–1 till the 11th cycle. BC also exhibited good cycle ability with a specific capacity of 356 mAh g–1 after 79 cycles at a current density of 0.5 C. This work proved to be an effective approach for boron-doped carbon nanostructures which has potential usage for lithium storage material.

scholarly journals Cobalt Sulfide Confined in N-Doped Porous Branched Carbon Nanotubes for Lithium-Ion Batteries

2019 ◽  
Vol 11 (1) ◽  
Author(s):  
Yongsheng Zhou ◽  
Yingchun Zhu ◽  
Bingshe Xu ◽  
Xueji Zhang ◽  
Khalid A. Al-Ghanim ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Lithium Ion Batteries ◽  
Current Density ◽  
Large Scale ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Cobalt Sulfide ◽  
Energy Storage Devices ◽  
A Current

Abstract Lithium-ion batteries (LIBs) are considered new generation of large-scale energy-storage devices. However, LIBs suffer from a lack of desirable anode materials with excellent specific capacity and cycling stability. In this work, we design a novel hierarchical structure constructed by encapsulating cobalt sulfide nanowires within nitrogen-doped porous branched carbon nanotubes (NBNTs) for LIBs. The unique hierarchical Co9S8@NBNT electrode displayed a reversible specific capacity of 1310 mAh g−1 at a current density of 0.1 A g−1, and was able to maintain a stable reversible discharge capacity of 1109 mAh g−1 at a current density of 0.5 A g−1 with coulombic efficiency reaching almost 100% for 200 cycles. The excellent rate and cycling capabilities can be ascribed to the hierarchical porosity of the one-dimensional Co9S8@NBNT internetworks, the incorporation of nitrogen doping, and the carbon nanotube confinement of the active cobalt sulfide nanowires offering a proximate electron pathway for the isolated nanoparticles and shielding of the cobalt sulfide nanowires from pulverization over long cycling periods.

Fabrication of a fayalite@C nanocomposite with superior lithium storage for lithium ion battery anodes

RSC Advances ◽  
2014 ◽  
Vol 4 (102) ◽  
pp. 58260-58264 ◽  
Author(s):  
Qingtang Zhang ◽  
Songwang Ge ◽  
Hongtao Xue ◽  
Xiaomei Wang ◽  
Hanxue Sun ◽  
...  
Keyword(s):  
Lithium Ion Battery ◽  
Crystalline Structure ◽  
Lithium Ion ◽  
Lithium Storage ◽  
Charge Capacity ◽  
Initial Discharge ◽  
A Current

Fayalite (α-Fe2SiO4) with an orthorhombic crystalline structure delivers an initial discharge/charge capacity of 849.0 mA h g−1/514.5 mA h g−1 and a second discharge/charge capacity of 504.9 mA h g−1/489.5 mA h g−1 at a current rate of 0.1 C.

PREPARATION OF THREE-DIMENSIONAL GRAPHENE NETWORKS FOR USE AS ANODE OF LITHIUM ION BATTERIES

2013 ◽  
Vol 06 (06) ◽  
pp. 1350063 ◽  
Author(s):  
HAI LI ◽  
CHUNXIANG LU
Keyword(s):  
Lithium Ion Batteries ◽  
Current Density ◽  
Graphene Nanosheets ◽  
Three Dimensional ◽  
Rate Capability ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
3D Graphene ◽  
Potential Applications ◽  
A Current

The three-dimensional (3D) graphene networks have been prepared by annealing the mixture of graphene oxide and SiO 2 nanoparticles and then etching SiO 2. The obtained material was characterized by X-ray diffraction, scanning electron microscope and transmission electron microscopy, which revealed that 3D networks consisting of crumpled graphene nanosheets were preserved after the removal of SiO 2. When used as anode material of lithium ion batteries, the graphene networks showed a reversible capacity of 610.9 mAh/g at a current density of 50 mA/g after 50 cycles and excellent rate capability of 291.5 mAh/g at a current density of 5000 mA/g. The good electrochemical performance can be attributed to the network structure, which enables graphene to electrochemically absorb more lithium ions and significantly improve the electrical conductivity of electrode. The graphene networks have the potential applications in ultracapacitor and catalyst supports.

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