Analysis of Irreversible Charge-Discharge Reaction in LiFePO4/Li4Ti5O12 Full-Cell Using Two-Phase Reaction Active Material

Lithium ion battery performance of graphitized Meso Carbon Micro Beads (MCMB) as an anode material was investigated in full cell battery system containing LiCoO2 cathode, PE separator and LiPF6 electrolyte. The commercial MCMB, which was fabricated by LinyiTM, was sintered at 500⁰C for five hour to make graphitized MCMB. The microstructure of graphitized MCMB was characterized using XRD and SEM to show the crystalinity, crystal phase and morphology of the MCMB particle. The result indicated that the crystal phase of the sample was changed into graphitized carbon .The electrode was made using coating method. We used copper foil as the substrate for anode. The anode materials consist of graphitized MCMB (active material), Polyvinylidene fluoride/PVDF (binder) and acetylene black (additive material). Full cell battery was tested using charge-discharge and cyclic voltammetry (CV) methods. From the CV characterization, cyclic voltammograms of the cell show characteristic lithium intercalation through reduction-oxidation peak. Charge-discharge test showed the discharge and charge capacity of the cells. According charge discharge test, commercial MCMB was better that graphitized MCMB.

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Electrospun SnO2-Graphene Composite Nanofibers as High Performance Anode for Lithium Ion Batteries

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.645-646.1207 ◽

2015 ◽

Vol 645-646 ◽

pp. 1207-1213

Author(s):

Yu Ling Wu ◽

Jie Lin ◽

Jian Yan Wang ◽

Hang Guo

Keyword(s):

Lithium Ion Batteries ◽

Composite Nanofibers ◽

Lithium Ion ◽

Morphological Properties ◽

Phase Reaction ◽

Galvanostatic Charge ◽

Two Phase ◽

Electrospinning Technique ◽

Graphene Composite ◽

Charge Discharge

A promising anode material for lithium ion batteries is reported in this paper. It is one-dimensional SnO2−graphene composite nanofibers (SnO2−G nanofibers) fabricated by using electrospinning technique. In the study, X-ray diffraction (XRD) and scanning electron microscopy (SEM) are used to characterize its structural and morphological properties. Samples with different ratio of SnO2 to graphene (wt%) are prepared to investigate its electrochemical performance. Galvanostatic charge/discharge tests reveals that Li-insertion/extraction is carried out through a two-phase reaction mechanism that is supported by galvanostatic charge−discharge profiles. It is found that the optimal proportion of SnO2 to graphene is 8:1 (wt%) for the electrospun composite materials. Furthermore, micro thin film batteries have been fabricated and tested. The results show that initial discharge capacity is 301.86 mA h g−1 at current density of 50 μA g−1, and battery can retain 63.3% of reversible capacity after 300 cycles, which is 5 times higher than bare SnO2.

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Meso Carbon Micro Bead (MCMB) Based Graphitized Carbon for Negative Electrode in Lithium Ion Battery

KnE Engineering ◽

10.18502/keg.v1i1.497 ◽

2016 ◽

Vol 1 ◽

Author(s):

Fadli Rohman

Keyword(s):

Lithium Ion Battery ◽

Polyvinylidene Fluoride ◽

Active Material ◽

Lithium Ion ◽

Crystal Phase ◽

Cyclic Voltammograms ◽

Full Cell ◽

Graphitized Carbon ◽

Charge Discharge ◽

Discharge Test

Lithium ion battery performance of graphitized Meso Carbon Micro Beads (MCMB) as an anode material was investigated in full cell battery system containing LiCoO2 cathode, PE separator and LiPF6 electrolyte. The commercial MCMB, which was fabricated by LinyiTM, was sintered at 500⁰C for five hour to make graphitized MCMB. The microstructure of graphitized MCMB was characterized using XRD and SEM to show the crystalinity, crystal phase and morphology of the MCMB particle. The result indicated that the crystal phase of the sample was changed into graphitized carbon .The electrode was made using coating method. We used copper foil as the substrate for anode. The anode materials consist of graphitized MCMB (active material), Polyvinylidene fluoride/PVDF (binder) and acetylene black (additive material). Full cell battery was tested using charge-discharge and cyclic voltammetry (CV) methods. From the CV characterization, cyclic voltammograms of the cell show characteristic lithium intercalation through reduction-oxidation peak. Charge-discharge test showed the discharge and charge capacity of the cells. According charge discharge test, commercial MCMB was better that graphitized MCMB.

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Numerical simulation of gas-solid two-phase reaction flow with multiple moving boundaries

International Journal of Numerical Methods for Heat &amp Fluid Flow ◽

10.1108/hff-01-2014-0018 ◽

2015 ◽

Vol 25 (2) ◽

pp. 375-390 ◽

Cited By ~ 7

Author(s):

Qiao Luo ◽

Xiaobing Zhang

Keyword(s):

Numerical Simulation ◽

Physical Phenomenon ◽

Great Influence ◽

Moving Boundaries ◽

Charge Weight ◽

Phase Reaction ◽

Two Phase ◽

Content Type ◽

One Dimensional ◽

Chamber Volume

Purpose – In engineering applications, gas-solid two-phase reaction flow with multi-moving boundaries is a common phenomenon. The launch process of multiple projectiles is a typical example. The flow of adjacent powder chambers is coupled by projectile’s motion. The purpose of this paper is to study this flow by numerical simulation. Design/methodology/approach – A one-dimensional two-phase reaction flow model and MacCormack difference scheme are implemented in a computational code, and the code is used to simulate the launch process of a system of multiple projectiles. For different launching rates and loading conditions, the simulated results of the launch process of three projectiles are obtained and discussed. Findings – At low launching rates, projectiles fired earlier in the series have little effect on the launch processes of projectiles fired later. However, at higher launching rates, the projectiles fired first have a great influence on the launch processes of projectiles fired later. As the launching rate increases, the maximum breech pressure for the later projectiles increases. Although the muzzle velocities increase initially, they reach a maximum at some launching rate, and then decrease rapidly. The muzzle velocities and maximum breech pressures of the three projectiles have an approximate linear relationship with the charge weight, propellant web size and chamber volume. Originality/value – This paper presents a prediction tool to understand the physical phenomenon of the gas-solid two-phase reaction flow with multi-moving boundaries, and can be used as a research tool for future interior ballistics studies of launch system of multiple projectiles.

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A two-phase system for the clean and high yield synthesis of furylmethane derivatives over –SO3H functionalized ionic liquids

Green Chemistry ◽

10.1039/c7gc01654a ◽

2017 ◽

Vol 19 (20) ◽

pp. 4804-4810 ◽

Cited By ~ 14

Author(s):

S. H. Shinde ◽

C. V. Rode

Keyword(s):

Ionic Liquids ◽

Reaction System ◽

High Yield ◽

Phase System ◽

Phase Reaction ◽

Two Phase ◽

Yield Production ◽

High Yield Production

A new and effective unique two-phase reaction system for the high yield production of tri(furyl)methane from furfural and furan.

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Preparation of Activated Carbon Derived from Water Hyacinth as Electrode Active Material for Li-Ion Supercapacitor

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1000.50 ◽

2020 ◽

Vol 1000 ◽

pp. 50-57

Author(s):

Jagad Paduraksa ◽

Muhammad Luthfi ◽

Ariono Verdianto ◽

Achmad Subhan ◽

Wahyu Bambang Widayatno ◽

...

Keyword(s):

Activated Carbon ◽

Water Hyacinth ◽

Electrode Materials ◽

Storage System ◽

Active Material ◽

Lithium Ion ◽

High Energy ◽

Specific Power ◽

Full Cell ◽

Lithium Ion Capacitor

Lithium-Ion Capacitor (LIC) has shown promising performance to meet the needs of high energy and power-density-energy storage system in the era of electric vehicles nowadays. The development of electrode materials and electrolytes in recent years has improvised LIC performance significantly. One of the active materials of LIC electrodes, activated carbon (AC), can be synthesized from various biomass, one of which is the water hyacinth. Its abundant availability and low utilization make the water hyacinth as a promising activated carbon source. To observe the most optimal physical properties of AC, this study also compares various activation temperatures. In this study, full cell LIC was fabricated using LTO based anode, and water hyacinth derived AC as the cathode. The LIC full cell was further characterized to see the material properties and electrochemical performance. Water hyacinth derived LIC can achieve a specific capacitance of 32.11 F/g, the specific energy of 17.83 Wh/kg, and a specific power of 160.53 W/kg.

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Operando XRD study of LiMn1.5Ni0.5O4 high-voltage cathode under high-rate charge-discharge reaction

Powder Diffraction ◽

10.1017/s0885715619000083 ◽

2019 ◽

Vol 34 (S1) ◽

pp. S8-S13

Author(s):

T. Konya ◽

Y. Shiramata ◽

T. Nakamura

Keyword(s):

Volume Change ◽

Low Voltage ◽

High Rate ◽

Insertion Reaction ◽

Phase Reaction ◽

Two Phase ◽

Voltage Range ◽

Lattice Volume ◽

Rate Determining Step ◽

Spinel Cathode

Structural variation of LiMn1.5Ni0.5O4 spinel cathode during the Li+ extraction/insertion reaction was studied using operando X-ray diffraction. It was found that the reaction in the voltage range from 3.5 to 4.9 V consisted of two consecutive two-phase reactions, where three spinel phases of LiMn1.5Ni0.5O4, Li0.5Mn1.5Ni0.5O4 and Mn1.5Ni0.5O4 were identified and the lattice volume change in the whole reaction was evaluated as 6%. The reactions were symmetric and reversible under low-current conditions, but some asymmetries were detected during high current operation. Furthermore, a two-phase reaction between cubic and tetragonal phases was observed in the low-voltage reaction at 2.1–3.5 V, where the lattice volume change was approximately 4.9%. The rate-determining step was discussed based on these operando results.

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Preparation and Electrochemical Performances of Calcium Zincate Synthesized by Microwave Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.236-238.868 ◽

2011 ◽

Vol 236-238 ◽

pp. 868-871 ◽

Cited By ~ 1

Author(s):

Meng Liang Tong ◽

Xuan Yan Liu

Keyword(s):

Cyclic Voltammetry ◽

Active Material ◽

Electrochemical Performances ◽

Microwave Method ◽

X Ray ◽

Battery Charge ◽

Secondary Battery ◽

Initial Capacity ◽

Charge Discharge ◽

Discharge Test

Calcium zincate as an active material in Zn/Ni secondary battery has been successfully synthesized by microwave method. The chemical composition of Ca(OH)2·2Zn(OH)2·2H2O was confirmed by X-ray powder diffraction pattern and weight loss in thermogravimetric analysis.The results of cyclic voltammetry and experimental Zn/Ni battery charge–discharge test showed that the material of calcium zincate had excellent electrochemical performances: a high discharging platform of 1.685 V and a good cycleability, discharge capacity would be 70.0% of initial capacity after circulated 120 times.

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Electrochemical Performance of Molybdenum Disulfide Supercapacitor Electrode in Potassium Hydroxide and Sodium Sulfate Electrolytes

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.f7602.038620 ◽

2020 ◽

Vol 8 (6) ◽

pp. 5499-5503

Keyword(s):

Molybdenum Disulfide ◽

Active Material ◽

Current Collector ◽

Future Application ◽

Energy Storage Materials ◽

Discharge Process ◽

Supercapacitor Electrode ◽

Optical And Mechanical Properties ◽

Interest In Research ◽

Charge Discharge

Two-dimensional materials have attracted growing interest in research because of their specific electronic, physical, optical and mechanical properties. Molybdenum disulfide was theoretically investigated as novel energy storage materials because of its unusual physicochemical properties. This paper describes easy approach to fabricate molybdenum disulfide (MoS2 ) electrode using slurry technique on conducting substrate namely Ni foam as current collector for supercapacitor device application. This MoS2 electrode exhibits relatively good specific gravimetric capacitance, (Csp) of 11.12 to 12.38 Fg -1 at 1 mVs -1 scan rate. Moreover, galvanostatic charge-discharge displays symmetrical triangular curves which attributed to the fast charge-discharge process (in seconds). These results show that MoS2 active material can be charged and discharged reversibly between 0.2 and 1.0 V (in 6 M KOH) and between 0.3 and 1.0 V (in 0.5 M Na2SO4 ). From cyclic stability test exhibits capacitance retention of up to 83% and 64% after 1000 cycles in 6 M KOH and 0.5 M Na2SO4 , respectively. The MoS2 electrode is thus a promising material for future application of the supercapacitor.

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