Characteristics of (Fe, M)S2 (M=Co, Ni, Mo) Composite Powders Fabricated by MCP

As the electrodes of secondary battery are made with sulfide composite powders, excellent electrode system of environmental non-toxicity and with high specific energy density and low material cost can be obtained. In this study, the (Fe, M)S2 composite powders was synthesized by mechanochemical processes (MCP) in order to improve of the cycle life in bettery. The formation of pyrite phase appreared at the case which adds nickel, but it was not observed in the case where the transition metal was does not add but the transition metal such as cobalt, molybdenum was added in stead. From charge-discharge test results, the initial discharge capasity of (Fe, Ni)S2 electrode was 845 mAh/g. The initial discharge capasity of (Fe, Co)S2 electrode was 500mAh/g, but it showed a better cycle perfoemance than the case where the diffrent transition metal was added.

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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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One-Step Hydrothermal Synthesis of CoNi2S4 for Hybrid Supercapacitor Electrodes

NANO ◽

10.1142/s1793292019500887 ◽

2019 ◽

Vol 14 (07) ◽

pp. 1950088 ◽

Cited By ~ 1

Author(s):

Peng Liu ◽

Yanwei Sui ◽

Fuxiang Wei ◽

Jiqiu Qi ◽

Qingkun Meng ◽

...

Keyword(s):

Electrode System ◽

Hybrid Supercapacitor ◽

Microstructural Study ◽

Specific Energy Density ◽

Reduced Graphene ◽

Efficient Charge ◽

Spherical Core ◽

One Step ◽

High Specific Energy ◽

Cycling Life

In this study, a simple one-step hydrothermal method was developed to prepare a novel hierarchical CoNi2S4 nanostructure similar to rambutan fruit. The surface microstructural study clearly visualized that the rambutan-like CoNi2S4 consists of nanorods grown directly on the surface of spherical core structures. The close attachment of the nanorods to the spheres increased the active areas of the electrode, which facilitates efficient charge transport from the nanorods to the spherical core structure. CoNi2S4 with a rambutan-like hierarchical structure showed an excellent specific capacitance of 944[Formula: see text]F[Formula: see text]g[Formula: see text] at 1[Formula: see text]A[Formula: see text]g[Formula: see text], considerable rate capacitance (75.6% retention at 10[Formula: see text]A[Formula: see text]g[Formula: see text]) and excellent cycling life (91.1% retention after 5000 circulations) in the three-electrode system. Besides, the assembled hybrid supercapacitor based on CoNi2S4 and reduced graphene oxide exhibited a high specific energy density of 23.58[Formula: see text]Wh[Formula: see text]kg[Formula: see text] at the power density of 800[Formula: see text]W[Formula: see text]kg[Formula: see text].

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Synthesis of LiNi1/3Co1/3Mn1/3O2 Composite Powders by Solid State Reaction

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.158.262 ◽

2010 ◽

Vol 158 ◽

pp. 262-272 ◽

Cited By ~ 4

Author(s):

Li Zhang ◽

Pei Xin Zhang ◽

Zhen Zhen Fan ◽

Xiang Zhong Ren ◽

Dong Yun Zhang ◽

...

Keyword(s):

Solid State ◽

Discharge Capacity ◽

Retention Rate ◽

High Energy ◽

Molar Ratio ◽

Wet Milling ◽

Composite Powders ◽

Capacity Retention ◽

Charge Discharge ◽

Discharge Test

A mixture of Li2CO3, NiO, Co2O3 and MnO2 with a molar ratio was introduced in the mixed high energy ball milling, LiNi1/3Co1/3Mn1/3O2 was prepared by solid state phase using mechanochemical activation which has highly reactive materials. The structure and electrochemical properties of LiNi1/3Co1/3Mn1/3O2 were analisised by employing X-ray diffraction(XRD), scanning electron microscopy(SEM) and galvanotactic charge-discharge test. Charge-discharge test results show that when the the LiNi1/3Co1/3Mn1/3O2 cathode was prepared by wet milling 10h between 2.8 V and 4.4V at a current of 0.5C rate, the initial discharge capacity is 135.1mAh/g, the capacity retention rate of 93.26% after 20 cycles. When nLi: n (Ni + Co + Mn) = 1.1, the samples sintered 20h at 850 °C, the first discharge capacity is 148.5 mAh/g, and the capacity retention rate is 94.88% after 40 cycles.

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Preparation and Study on Si/Ag/C Composite as Anode Material for Lithium Ion Batteries

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.834-836.281 ◽

2013 ◽

Vol 834-836 ◽

pp. 281-284

Author(s):

Tao Cui ◽

Yao Wu Wang ◽

Xu Yao Hu ◽

Yu Ming Shang ◽

Xiang Ming He ◽

...

Keyword(s):

Surface Morphology ◽

Electrochemical Performance ◽

Lithium Ion Batteries ◽

Lithium Ion ◽

Reversible Capacity ◽

Test Results ◽

Electrochemical Test ◽

Sem Images ◽

Charge Discharge ◽

Discharge Test

Si/Ag/C composite was prepared by two-step reaction. The phase and surface morphology of samples was studied by XRD and SEM. The electrochemical performance of the composite was investigated by charge/discharge test. SEM images indicate that the particles dispersed uniform and structure of the materials is stable. Electrochemical test results show that the initial discharged and charge capacities of Si/Ag/C composite are 2016.9 mAh/g and 1275.0 mAh/g, respectively. A reversible capacity of Si/Ag/C composite after 50 cycles is 325.5 mAh/g retained.

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Synthesis and Electrochemical Performance of Li3V2(PO4)3 Cathode Material by Microwave Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.490-495.3624 ◽

2012 ◽

Vol 490-495 ◽

pp. 3624-3627

Author(s):

Sheng Kui Zhong ◽

Hui Ping Hu ◽

Jie Qun Liu

Keyword(s):

Perfect Crystal ◽

Microwave Method ◽

Initial Discharge Capacity ◽

X Ray Diffraction ◽

Capacity Retention ◽

Voltage Range ◽

X Ray ◽

Initial Discharge ◽

Charge Discharge ◽

Discharge Test

Monoclinic Li3V2(PO4)3 was synthesized by a microwave method. The influence of sintering temperatures and time on the synthesis of Li3V2(PO4)3 was investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and charge-discharge test. The results of these tests shows that the Li3V2(PO4)3 sample synthesized at 850 °C for 15 min has pure and perfect crystal. The charge-discharge test shows the Li3V2(PO4)3 sample with optimal synthesis condition has the best initial discharge capacity of 120 mAh/g, with capacity retention of 101 mAh/g after 50 cycles, in the voltage range of 3.0 V–4.2 V.

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Preparation and Performance of Si/Al/C Composites Anode Material Prepared by Glucose-Modified

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.164.268 ◽

2012 ◽

Vol 164 ◽

pp. 268-271

Author(s):

Xu Ma ◽

Ling Long Kong ◽

Yu Ling Liu ◽

Yan Hong Ding ◽

Jie Zhao ◽

...

Keyword(s):

Anode Material ◽

Coulombic Efficiency ◽

Test System ◽

Cycling Stability ◽

Charge Capacity ◽

And Performance ◽

Charge Discharge ◽

Discharge Test

Si/Al/C composites were synthesized by the method of doping aluminum and glucose-modified. The samples were characterized by XRD, SEM, and the capacity and cycling stability of the composites were tested by electrochemical charge/discharge test system. After glucose was pyrolyzed, the first discharge and charge capacity of Si/Al/C composites were 1312 and 956.7mAh/g, and the first coulombic efficiency was 72.9%. After 50 cycles, the capacity of Si/Al/C composites was 440mAh /g and the coulombic efficiency remained over 98.1%

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Synthesis and Electrochemical Properties of Lithium Titanate Anode Materials Powders by Solid State Reaction of Li and Spherical TiO2 Powders

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.485.119 ◽

2011 ◽

Vol 485 ◽

pp. 119-122

Author(s):

Motofumi Yamada ◽

Hiroshi Kawaguchi ◽

Takayuki Kodera ◽

Takashi Ogihara

Keyword(s):

Solid State ◽

Solid State Reaction ◽

Spinel Structure ◽

Anode Materials ◽

Lithium Titanate ◽

Initial Discharge Capacity ◽

Composite Powders ◽

Particle Characteristics ◽

Initial Discharge ◽

Acid Aqueous Solution

Li4Ti5O12 powders were synthesized by solid state reaction of Li2CO3 and spherical composite powders of carbon and TiO2 (denoted as C/TiO2). C/TiO2 powders were synthesized by spray pyrolysis of using lactic acid aqueous solution. The particle characteristics of Li4Ti5O12 powders were determined by SEM, XRD and DTA-TG. DTA-TG showed that the carbon content was around 8 wt% in Li4Ti5O12 powders. XRD revealed that the spinel structure (Fd3m) was obtained by heating at 750 °C under N2 atmosphere. The first rechargeable capacity of Li4Ti5O12 anode was about 160 mAh/g at 1 C. That of Li4Ti5O12 anode decreased to 90 mAh/g at 20 C. The rechargeable capacity of Li4Ti5O12 anode decreased with increasing the rechargeable rate, but 81% of initial discharge capacity of Li4Ti5O12 anode was retained after 200 cycles at 1C

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