scholarly journals Extremely Pure Mg2FeH6 as a Negative Electrode for Lithium Batteries

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1952 ◽  
Author(s):  
Sergio Brutti ◽  
Luca Farina ◽  
Francesco Trequattrini ◽  
Oriele Palumbo ◽  
Priscilla Reale ◽  
...  
Keyword(s):  
Lithium Batteries ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
Negative Electrode ◽  
Reversible Capacity ◽  
Xrd Analysis ◽  
Ex Situ ◽  
Molar Ratio ◽  
Conversion Reaction ◽  
Lithium Cell

Nanocrystalline samples of Mg-Fe-H were synthesized by mixing of MgH2 and Fe in a 2:1 molar ratio by hand grinding (MIX) or by reactive ball milling (RBM) in a high-pressure vial. Hydrogenation procedures were performed at various temperatures in order to promote the full conversion to Mg2FeH6. Pure Mg2FeH6 was obtained only for the RBM material cycled at 485 °C. This extremely pure Mg2FeH6 sample was investigated as an anode for lithium batteries. The reversible electrochemical lithium incorporation and de-incorporation reactions were analyzed in view of thermodynamic evaluations, potentiodynamic cycling with galvanostatic acceleration (PCGA), and ex situ X-ray Diffraction (XRD) tests. The Mg2FeH6 phase underwent a conversion reaction; the Mg metal produced in this reaction was alloyed upon further reduction. The back conversion reaction in a lithium cell was here demonstrated for the first time in a stoichiometric extremely pure Mg2FeH6 phase: the reversibility of the overall conversion process was only partial with an overall coulombic yield of 17% under quasi-thermodynamic control. Ex situ XRD analysis highlighted that the material after a full discharge/charge in a lithium cell was strongly amorphized. Under galvanostatic cycling at C/20, C/5 and 1 C, the Mg2FeH6 electrodes were able to supply a reversible capacity with increasing coulombic efficiency and decreasing specific capacity as the current rate increased.

Preparation and Electrochemical Performance of Praseodymium Doped SnO2 Particles as Negative Electrode Material of Lithium-Ion Battery

2014 ◽  
Vol 492 ◽  
pp. 370-374
Author(s):  
Xiao Zhen Liu ◽  
Guang Jian Lu ◽  
Xiao Zhou Liu ◽  
Jie Chen ◽  
Han Zhang Xiao
Keyword(s):  
Lithium Ion Battery ◽  
Electrode Material ◽  
Electrode Materials ◽  
Raw Materials ◽  
Negative Electrode ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Xrd Analysis ◽  
Coprecipitation Method ◽  
Negative Electrode Material

Pr doped SnO2 particles as negative electrode material of lithium-ion battery are synthesized by the coprecipitation method with SnCl4·5H2O and Pr2O3 as raw materials. The structure of the SnO2 particles and Pr doped SnO2 particles are investigated respectively by XRD analysis. Doping is achieved well by coprecipitation method and is recognized as replacement doping or caulking doping. Electrochemical properties of the SnO2 particles and Pr doped SnO2 particles are tested by charge-discharge and cycle voltammogram experimentation, respectively. The initial specific discharge capacity of Pr doped SnO2 the negative electrode materials is 676.3mAh/g. After 20 cycles, the capacity retention ratio is 90.5%. The reversible capacity of Pr doped SnO2 negative electrode material higher than the reversible capacity of SnO2 negative electrode material. Pr doped SnO2 particles has good lithiumion intercalation/deintercalation performance.

Cu–Al–Si alloy anode material with enhanced electrochemical properties for lithium ion batteries

2019 ◽  
Vol 12 (04) ◽  
pp. 1950054 ◽  
Author(s):  
Huilin Fan ◽  
Youhong Wang ◽  
Mingxiang Yu ◽  
Kangkang Wang ◽  
Junting Zhang ◽  
...  
Keyword(s):  
Anode Material ◽  
Electrode Material ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
Negative Electrode ◽  
Lithium Ion ◽  
Alloy Anode ◽  
Multiple Mixing ◽  
Negative Electrode Material ◽  
Circular Outline

The microstructure and electrochemical property of Cu–Al–Si alloy anode material are studied in this paper. The research shows that the alloy particle has a basic circular outline, and two copper-rich phases with different silicon contents are detected in the particle, and both phases with nanostructure are observed in its surface layer. The nano-silicon alloy negative electrode material needs to be used in a certain proportion with graphite, binder and conductive agent, and the stirring process also has an important influence on its electrochemical performance. Multiple mixing can achieve a better cycle retention compared to direct mixing. The first-cycle coulombic efficiency of the electrode material is improved up to about 90%, and the specific capacity is still higher than 500[Formula: see text]mAh[Formula: see text]g[Formula: see text] after 100 cycles. The battery manufacturing process is similar to the graphite negative electrode, so it is easy to be applied.

The Electrochemistry of Germanium Nitride Versus Lithium

2002 ◽  
Vol 756 ◽  
Author(s):  
N. Pereira ◽  
M. Balasubramanian ◽  
L. Dupont ◽  
J. McBreen ◽  
L. C. Klein ◽  
...  
Keyword(s):  
Negative Electrode ◽  
Reversible Capacity ◽  
Ex Situ ◽  
X Ray Diffraction ◽  
Selective Area ◽  
Transmission Electron ◽  
Electrochemically Active ◽  
Li Ion ◽  
Negative Electrode Material

ABSTRACTGermanium nitride (Ge3N4) was examined as a potential negative electrode material for Li-ion batteries. The electrochemistry of Ge3N4 versus Li showed high reversible capacity (500mAh/g) and good capacity retention during cycling. A combination of ex-situ and in-situ x-ray diffraction (XRD), ex-situ transmission electron microscopy (TEM) and ex-situ selective area electron diffraction (SAED) analyses revealed evidence supporting the conversion of a layer of Ge3N4 crystal into an amorphous Li3N+LixGe nanocomposite during the first lithiation. The nanocomposite was electrochemically active via a reversible Li-Ge alloying reaction while a core of unreacted Ge3N4 crystal remained inactive. The lithium/metal nitride conversion reaction process was kinetically hindered resulting in limited capacity. Mechanical milling was found to improve the material capacity.

Preparation and Electrochemical Performance of Cathode Material Carbyne Polysulfide for Lithium Batteries

2006 ◽  
Vol 11-12 ◽  
pp. 407-412 ◽  
Author(s):  
Bing Chuan Li ◽  
Wei Kun Wang ◽  
Zhi Feng Fu ◽  
An Bang Wang ◽  
Ke Guo Yuan
Keyword(s):  
Cathode Material ◽  
Lithium Batteries ◽  
Specific Capacity ◽  
Reversible Capacity ◽  
High Specific Capacity ◽  
Lithium Rechargeable Battery ◽  
Convenient Approach ◽  
Novel Material ◽  
New Type ◽  
Initial Cycle

Lithium rechargeable battery is a new type of battery developed in recent years. The studies on this system are naturally focused on the cathode material. The cathode material with conducting skeleton and energy-storing side lines was reported and a novel material carbyne polysulfide was studied. This paper was to explore a convenient approach for preparing carbyne polysulfide. The products obtained by co-heating polyvinylidene chloride(PVDC) and pulverized sulfur in ammonia environment was characterized by DSC /TG, IR, Raman spectrums and elemental analysis. And the product had been proved to have a sp2 hybride carbon skeleton with polysulfide attached on it, which resembles the theoretical structure of carbyne polysulfide. The material with favorable sulfur contents exhibited high specific capacity up to 705 mAh/g in the initial cycle and a stable reversible capacity approximately 420 mAh/g.

Density modulated multilayer silicon thin films as li-ion battery anodes

2012 ◽  
Vol 1440 ◽  
Author(s):  
M. Taha Demirkan ◽  
Xin Li ◽  
Bingqing Wei ◽  
Tansel Karabacak
Keyword(s):  
Thin Films ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
High Capacity ◽  
Reversible Capacity ◽  
Low Density ◽  
Li Ion Battery ◽  
Silicon Thin Film ◽  
Battery Cell ◽  
Li Ion

AbstractIn this work, we demonstrate a new density modulated multilayered silicon thin film anode approach that can provide a robust high capacity electrode for Li-ion batteries. These films have the ability to tolerate large volume changes due to their controlled microstructure. Silicon films with alternating layers of high/low material density were deposited using a DC sputtering system. Density of the individual layers was controlled by simply changing the working gas pressure during sputtering. Samples of Si films having thicknesses of 460 nm with different number of high/low density layers have been deposited on Cu current collectors. The electrochemical performance of the multilayered anode material was evaluated using a galvanostatic battery testing system at C/10 rate. After reaching a stabilized phase the battery cell showed a high coulombic efficiency of 96% to 99% and reversible specific capacity of 666 mAh g-1 (after 100 cycles). Low-density layers are believed to be acting as compliant sheets during volume expansion making the films more durable compared to conventional Si film anodes. The results indicate that density modulated multilayer Si thin films can be used to improve the mechanical properties of Li-ion battery anodes leading to high reversible capacity values even after high number of cycles.

The Electrochemical Performance of Carboxymethyl Cellulose with Different DS as a Binding Material in Lithium Batteries

2012 ◽  
Vol 499 ◽  
pp. 114-119 ◽  
Author(s):  
Hong Ying Hao ◽  
Zi Qiang Shao
Keyword(s):  
Electrochemical Performance ◽  
Lithium Batteries ◽  
Carboxymethyl Cellulose ◽  
Electrochemical Impedance ◽  
Specific Capacity ◽  
Degree Of Substitution ◽  
Rechargeable Lithium Batteries ◽  
Lithium Cell ◽  
Binding Material ◽  
Galvanostatic Discharge

The carboxymethyl cellulose (CMC) with the different degree of substitution, which was synthesized in the mixed agent system of isopropanol and ethanol and water, was used in rechargeable Lithium batteries. The electrochemical performance of the 9,10-anthracenedione (AQ) electrodes with different binders were investigated by galvanostatic discharge/charge, cyclic voltammetry and electrochemical impedance spectroscopy techniques. Tested as the binding material in a lithium cell at room temperature, the CMC electrode showed better electrochemical performance compared to a PVDF electrode. It exhibited a specific capacity of up to 214 mAh.g-1at the initial discharge, and its specific capacity was maintained at 62 mAh.g-1after 50 cycles. In addition, it had better stability during the charge and discharge processes. Furthermore, the electrochemical performance of the CMC with lower degree of substitution(DS) was better.

scholarly journals Enhancing the electrochemical properties of a nickel–cobalt-manganese ternary hydroxide electrode using graphene foam for supercapacitors applications

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
V. N. Kitenge ◽  
K. O. Oyedotun ◽  
O. Fasakin ◽  
D. J. Tarimo ◽  
N. F. Sylla ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
Synthesis Method ◽  
Negative Electrode ◽  
Potential Range ◽  
Electrochemical Performances ◽  
Mass Loading ◽  
Graphene Foam ◽  
Nickel Cobalt

AbstractThis study has investigated the effect of the incorporation of graphene foam (GF) into the matrix of a ternary transition-metals hydroxide containing nickel, cobalt, and manganese for optimal electrochemical performances as electrodes for supercapacitors applications. An adopted simple, low-cost co-precipitation synthesis method involved the loading a mass of the ternary metal hydroxides (NiCoMn-TH) onto various GF mass loading so as to find ints effect on the electrochemical properties of the hydroxides. Microstructural and chemical composition of the various composite materials were investigated by employing scanning/transmission electron microscopy (SEM/TEM), x-ray diffraction (XRD), Raman spectroscopy, and N2 physisorption analysis among others. Electrochemical performances of the NiCoMn-TH/200 mg GF composite material evaluated in a three-electrode system using 1 M KOH solution revealed a maximum specific capacity around 178.6 mAh g−1 compared to 76.2 mAh g−1 recorded for the NiCoMn-TH pristine material at a specific current of 1 A g−1. The best mass loading of GF nanomaterial (200 mg GF), was then utilised as a positive electrode material for the design of a novel hybrid device. An assembled hybrid NiCoMn-TH/200 mg GF//CSDAC device utilizing the NiCoMn-TH/200 mg GF and activated carbon derived from the cocoa shell (CSDAC) as a positive and negative electrode, respectively, demonstrated a sustaining specific capacity of 23.4 mAh g−1 at a specific current of 0.5 A g−1. The device also yielded sustaining a specific energy and power of about 22.32 Wh kg−1 and 439.7 W kg−1, respectively. After a cycling test of over 15,000 cycles, the device could prove a coulombic efficiency of ~ 99.9% and a capacity retention of around 80% within a potential range of 0.0–1.6 V at a specific current of 3 A g−1. These results have demonstrated the prodigious electrochemical potentials of the as-synthesized material and its capability to be utilized as an electrode for supercapacitor applications.

scholarly journals Achieving over 90 % initial Coulombic efficiency and highly stable Li storage in SnO2 by constructing interfacial oxygen redistribution in multilayers

2021 ◽  
Author(s):  
Xuexia Lan ◽  
Jie Cui ◽  
Xiaofeng Zhang ◽  
Renzong Hu ◽  
Liang Tan ◽  
...  
Keyword(s):  
High Performance ◽  
Tin Dioxide ◽  
Theoretical Calculations ◽  
Coulombic Efficiency ◽  
High Capacity ◽  
Reversible Capacity ◽  
Cycling Stability ◽  
Ex Situ ◽  
Initial Coulombic Efficiency ◽  
Li Storage

Abstract Among the promising high capacity anode materials, tin dioxide (SnO2) represents a classic and important candidate that involves both conversion and alloying reactions toward Li storage. However, the inferior reversibility of conversion reactions usually results in low initial Coulombic efficiency (ICE, ~ 60%), small reversible capacity and poor cycling stability of electrodes. Here, we demonstrate that by carefully designing the interface structure of SnO2-Mo, a breakthrough comprehensive performance with ultrahigh average ICE up to 92.6 %, large capacity of 1067 mA h g-1 and 100 % capacity retention after 200 cycles can be realized in a multilayer Mo/SnO2/Mo electrode. The amorphous SnO2/Mo interfaces, which are induced by redistribution of oxygen atoms between SnO2 and Mo, can precisely adjust the reversible capacity and cycling stability of the multilayers, while the stable capacities of electrodes are parabolic with the interfacial density. Theoretical calculations and in/ex-situ experimental investigation clearly reveal that oxygen redistribution in the SnO2/Mo hetero-interfaces boosts the Li ions transport kinetics by inducing a built-in electric field and improves the reaction reversibility of SnO2. This work provides a new understanding of the interface-performance relationship of metal-oxide hybrid electrodes and pivotal guidance for creating high performance Li-ion batteries.

scholarly journals Unlocking the potential of amorphous red phosphorus films as a long-term stable negative electrode for lithium batteries

2017 ◽  
Vol 5 (5) ◽  
pp. 1925-1929 ◽  
Author(s):  
Chandrasekar M. Subramaniyam ◽  
Zhixin Tai ◽  
Nasir Mahmood ◽  
Dan Zhang ◽  
Hua Kun Liu ◽  
...  
Keyword(s):  
Lithium Batteries ◽  
Lithium Battery ◽  
Negative Electrode ◽  
Reversible Capacity ◽  
High Energy ◽  
Red Phosphorus ◽  
Sonication Technique ◽  
Battery Anode

Amorphous red phosphorus films (NS-RP) synthesized by a high energy sonication technique delivered a reversible capacity of 2137 mA h g−1 when used as a sole active lithium battery anode.

scholarly journals Cycling properties of Na3V2(PO4)2F3 as positive material for sodium-ion batteries

Ionics ◽  
2021 ◽  
Vol 27 (5) ◽  
pp. 1853-1860
Author(s):  
Nicolò Pianta ◽  
Davide Locatelli ◽  
Riccardo Ruffo
Keyword(s):  
Electrode Materials ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
Scale Up ◽  
Negative Electrode ◽  
Sodium Ion ◽  
High Rate ◽  
Electrochemical Performances ◽  
Metallic Sodium ◽  
Free Standing

AbstractThe research into sodium-ion battery requires the development of high voltage cathodic materials to compensate for the potential of the negative electrode materials which is usually higher than the lithium counterparts. In this framework, the polyanionic compound Na3V2(PO4)2F3 was prepared by an easy-to-scale-up carbothermal method and characterized to evaluate its electrochemical performances in half cell vs. metallic sodium. The material shows a specific capacity (115 mAh g−1) close to the theoretical limit, good coulombic efficiency (>99%) and an excellent stability over several hundred cycles at high rate. High-loading free-standing electrodes were also tested, which showed interesting performances in terms of areal capacity and cyclability.

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