A facile synthesis of three dimensional graphene sponge composited with sulfur nanoparticles for flexible Li–S cathodes

2016 ◽  
Vol 18 (32) ◽  
pp. 22146-22153 ◽  
Author(s):  
Chao Lin ◽  
Chaojiang Niu ◽  
Xu Xu ◽  
Ke Li ◽  
Zhengyang Cai ◽  
...  
Keyword(s):  
Self Assembly ◽  
Three Dimensional ◽  
High Rate ◽  
Sulfur Cathode ◽  
Facile Synthesis ◽  
Capacity Retention ◽  
Assembly Method ◽  
Graphene Sponge ◽  
Rate Discharge ◽  
High Rate Discharge

A novel 3DGS was fabricatedviaa reduction induced self-assembly method. When used as a sulfur cathode, it shows high rate discharge capacity retention up to 500 cycles.

scholarly journals Binder free three-dimensional sulphur/few-layer graphene foam cathode with enhanced high-rate capability for rechargeable lithium sulphur batteries

Nanoscale ◽  
2014 ◽  
Vol 6 (11) ◽  
pp. 5746-5753 ◽  
Author(s):  
Kai Xi ◽  
Piran R. Kidambi ◽  
Renjie Chen ◽  
Chenlong Gao ◽  
Xiaoyu Peng ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Rate Capability ◽  
High Rate ◽  
High Rate Capability ◽  
Capacity Retention ◽  
Layer Graphene ◽  
Binder Free ◽  
Rate Discharge ◽  
Few Layer Graphene ◽  
High Rate Discharge

A novel ultra-lightweight 3-D Li-S battery cathode has been synthesised by loading sulphur on to an interconnected 3-D network of few-layered graphene. The battery shows high rate discharge capacity retention for up to 400 cycles.

A Comparative Study of Potentiostatic and Potentiodynamic Method in the Synthesis of MnO2 Films for Electrochemical Capacitors

2011 ◽  
Vol 239-242 ◽  
pp. 501-505 ◽  
Author(s):  
Ling Bin Kong ◽  
Rui Juan Bai ◽  
Yong Chun Luo ◽  
Long Kang
Keyword(s):  
Specific Capacitance ◽  
Nickel Foam ◽  
Three Dimensional ◽  
High Rate ◽  
X Ray Diffraction ◽  
Ac Impedance Spectroscopy ◽  
X Ray ◽  
Rate Discharge ◽  
High Rate Discharge ◽  
Potentiodynamic Method

Nanostructured ε-manganese dioxide films are deposited directly on three-dimensional nickel foam (NF) from 0.25 M Mn(CH3COO)2 by means of the potentiostatic method (PSM) and potentiodynamic method (PDM). The prepared MnO2 films are characterized by X-ray diffraction and scanning electron microscopy. The electrochemical properties of MnO2 films are investigated by cyclic voltammetry (CV), charge-discharge tests, and alternating current (AC) impedance spectroscopy. The results show that the PSM-MnO2 films exhibit higher specific capacitance and better high-rate discharge ability, which are more promising for applications in supercapacitor than PDM-MnO2 films. The specific capacitance of PSM-MnO2 films is about 664 F g-1 at 5.5 A g-1, which is higher than many reported values.

A 3D nanostructure of graphene interconnected with hollow carbon spheres for high performance lithium–sulfur batteries

2015 ◽  
Vol 3 (21) ◽  
pp. 11395-11402 ◽  
Author(s):  
Shuangke Liu ◽  
Kai Xie ◽  
Zhongxue Chen ◽  
Yujie Li ◽  
Xiaobin Hong ◽  
...  
Keyword(s):  
Self Assembly ◽  
High Performance ◽  
High Rate ◽  
Carbon Spheres ◽  
Sulfur Cathode ◽  
Assembly Method ◽  
Lithium Sulfur Batteries ◽  
Hollow Carbon ◽  
High Rate Performance ◽  
Hollow Carbon Spheres

A novel 3D rGO–HCS nanostructure was designed via a hydrothermal self-assembly method. When used as a sulfur cathode, it delivers a low capacity-decay rate of 0.052% per cycle after 400 cycles and shows a high rate performance.

scholarly journals Effect of Rare Earth Elements on the Structure and Electrochemical Properties of La0.63R0.2Mg0.17Ni3.1Co0.3 Al0.1 Alloy Electrodes

2014 ◽  
Vol 17 (4) ◽  
pp. 235-242 ◽  
Author(s):  
Zhijie Gao ◽  
Xiaodong Zheng ◽  
Ping Du ◽  
Yongchun Luo
Keyword(s):  
Electrochemical Properties ◽  
Retention Rate ◽  
Steel Tube ◽  
High Rate ◽  
Stainless Steel Tube ◽  
Induction Melting ◽  
Hydrogen Storage Alloys ◽  
Capacity Retention ◽  
Rate Discharge ◽  
High Rate Discharge

Hydrogen storage alloys La0.63R0.2Mg0.17Ni3.1Co0.3Al0.1 (R = La, Ce, Pr, Nd, Y, Sm, Gd) based on A2B7 type were prepared by induction melting method. The alloys were annealed at 1173K during a week in a sealed stainless steel tube. The structure and the electrochemical properties of the annealed alloys have been studied systematically by XRD, EPMA and electrochemical studies. The alloys structure consists mainly of Ce2Ni7-type (SG: P63/mmc) La2Ni7 phase as well as minor Gd2Co7-type (SG: R-3m) phase, LaNi5 (CaCu5-type, SG:P6/mmm) phase. It is resulted that La0.65Y0.2Mg0.15Ni3.1Co0.3Al0.1 alloy exhibited the maximum electrochemical discharge capacity of 381.2 mAh·g-1. The best cycling stability was obtained with the La0.65Gd0.2Mg0.15Ni3.1Co0.3Al0.1 based alloy. This stability measured as the capacity retention rate at the 100th cycle (S100) was the highest for this sample (92.7%). The variation of the high rate discharge ability with the alloy composition. Its displayed a wave-like change. Firstly it increased from 24.5% (R = La) to 78.4% (R = Ce), then decreased to 14.4 % (R = Sm), and increased again to 63.8% with R = Gd.

Electrospun graphene-wrapped Na6.24Fe4.88(P2O7)4 nanofibers as a high-performance cathode for sodium-ion batteries

2017 ◽  
Vol 19 (26) ◽  
pp. 17270-17277 ◽  
Author(s):  
Yubin Niu ◽  
Maowen Xu ◽  
Chunlong Dai ◽  
Bolei Shen ◽  
Chang Ming Li
Keyword(s):  
Discharge Capacity ◽  
High Performance ◽  
Electronic Conductivity ◽  
Sodium Ion ◽  
High Rate ◽  
Sodium Ion Batteries ◽  
Rate Discharge ◽  
High Rate Discharge

Na6.24Fe4.88(P2O7)4 is one of the intensively investigated polyanionic compounds and has shown high rate discharge capacity, but its relatively low electronic conductivity hampers the high performance of the batteries.

Enhanced Hydrogen Storage Kinetics of Melt Spun Nanocrystalline and Amorphous Mg2Ni-Type Alloy by Substituting Ni with Co

2011 ◽  
Vol 399-401 ◽  
pp. 1419-1424
Author(s):  
Yang Huan Zhang ◽  
Guo Fang Zhang ◽  
Xia Li ◽  
Zhong Hui Hou ◽  
Yin Zhang ◽  
...  
Keyword(s):  
Melt Spinning ◽  
Cast Alloy ◽  
Nanocrystalline Structure ◽  
Amorphous Structure ◽  
High Rate ◽  
Desorption Kinetics ◽  
Type Alloy ◽  
Nanocrystalline And Amorphous ◽  
Rate Discharge ◽  
High Rate Discharge

The nanocrystalline and amorphous Mg2Ni1-xCox (x=0, 0.1, 0.2, 0.3, 0.4) alloys were prepared by melt-spinning technique. The structures of the alloys were studied by XRD, SEM and HRTEM. The hydrogen absorption and desorption kinetics and the high rate discharge ability (HRD) of the alloys were measured. The results show that the as-spun Co-free alloy holds a typical nanocrystalline structure, whereas the as-spun alloys containing Co display a nanocrystalline and amorphous structure, confirming that the substitution of Co for Ni facilitates the glass formation in the Mg2Ni-type alloy. The substitution of Co for Ni evidently improves the hydriding and dehydriding kinetics and the HRD of the alloys. With an increase in the amount of Co substitution from 0 to 0.4, the HRD value rises from 52.9% to 60.3% for the as-cast alloy, and from 65.9% to 76.0% for the as-spun (30 m/s) alloy.

Influence of Temperature on Self-Discharge and High-Rate Discharge Characteristics of La-Rich AB5-Based MH Alloy Electrode

2010 ◽  
Vol 654-656 ◽  
pp. 2835-2838 ◽  
Author(s):  
Huai Ying Zhou ◽  
Pei Pei Wang ◽  
Zhong Min Wang ◽  
Rui Ping Zou ◽  
Cheng Yuan Ni
Keyword(s):  
High Rate ◽  
Alloy Electrode ◽  
Discharge Process ◽  
Discharge Characteristics ◽  
Discharge Current Density ◽  
Influence Of Temperature ◽  
Capacity Loss ◽  
Influence Of Temperature On ◽  
Rate Discharge ◽  
High Rate Discharge

The influence of temperature on self-discharge and high-rate discharge characteristics of MmNi3.65(CoAlMn)1.35 alloy electrode has been investigated by way of simulated battery tests. Self-discharge behaviors of the MH electrode were measured using two methods: continuous mode self-discharge and step mode self-discharge. The results indicate that both reversible and irreversible capacity loss of MH electrode are mainly affected by temperature and storage time. When tested at 323K, the gross capacity loss after storage for 4 days is 30.88%, 15.02% at 273K and 20.09% at 303K, respectively. SEM analysis has shown that some needle corrosion products are formed on the surface of MH electrode, especially following storage at high temperature. The efficiency of high-rate discharge process is related closely to its discharge current density (DCD) adopted in tests, discharged capacities decreased with increasing DCD, and the electrode performed good high-rate discharge behavior at 303 K. Cyclic voltammetry (CV) analysis has indicated that near linear relationships between Ip and Scan rate (v) have been observed in the three temperature cases. The calculated values of hydrogen diffusion coefficient (D) within the electrode, are 1.479×10-8 cm2 / s at 273K, 2.437×10-8 cm2 / s at 303K, and 3.156×10-8 cm2 / s at 323K, respectively.

Facile synthesis of graphitic porous carbons with three-dimensional nanonetwork for high-rate supercapacitive energy storage

2016 ◽  
Vol 51 (12) ◽  
pp. 5676-5684 ◽  
Author(s):  
Zhenghui Li ◽  
Haiyan Zhang ◽  
Haiping Zhu ◽  
Liuqing Li ◽  
Haiyang Liao
Keyword(s):  
Energy Storage ◽  
Three Dimensional ◽  
High Rate ◽  
Porous Carbons ◽  
Facile Synthesis

Enhanced high-rate discharge properties of La 11.3 Mg 6.0 Sm 7.4 Ni 61.0 Co 7.2 Al 7.1 with added graphene synthesized by plasma milling

2014 ◽  
Vol 39 (24) ◽  
pp. 12765-12772 ◽  
Author(s):  
L.Z. Ouyang ◽  
Z.J. Cao ◽  
L.L. Li ◽  
H. Wang ◽  
J.W. Liu ◽  
...  
Keyword(s):  
High Rate ◽  
Rate Discharge ◽  
High Rate Discharge

Deterioration of lithium iron phosphate/graphite power batteries under high-rate discharge cycling

2015 ◽  
Vol 176 ◽  
pp. 270-279 ◽  
Author(s):  
Yong Zheng ◽  
Yan-Bing He ◽  
Kun Qian ◽  
Baohua Li ◽  
Xindong Wang ◽  
...  
Keyword(s):  
Lithium Iron Phosphate ◽  
Iron Phosphate ◽  
High Rate ◽  
Rate Discharge ◽  
High Rate Discharge
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