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A Conductive Polypyrrole-Coated, Sulfur-Carbon Nanotube Composite For Use In Lithium-Sulfur Batteries, Jianli Wang, Lin Lu, Dongqi Shi, Richard Tandiono, Zhaoxiang Wang, Konstantin Konstantinov, Hua Liu
A Conductive Polypyrrole-Coated, Sulfur-Carbon Nanotube Composite For Use In Lithium-Sulfur Batteries, Jianli Wang, Lin Lu, Dongqi Shi, Richard Tandiono, Zhaoxiang Wang, Konstantin Konstantinov, Hua Liu
Jianli Wang
A novel ternary composite, polypyrrole (PPy)-coated sulphur-carbon nanotube (S-CNT), is synthesised by using an in situ, one-pot method. Firstly, elemental sulfur is loaded into the CNT network by a solution-based processing technique. Then conducting PPy is coated on the surface of the S-CNT composite to form the S-CNT-PPy ternary composite by carrying out polymerization of the pyrrole monomer in situ. The ternary composite is tested as a cathode for lithium-sulfur batteries. The results show that PPy coating improves significantly the performance of the binary composites (S-CNT and S-PPy). The conducting PPy is believed to serve multiple functions in the composite: …
Electrochemical Behavior Of Mn3sn2 As Anode For Lithium Ion Batteries, Li Li, Rong Zeng, Christopher Cook, Zaiping Guo, Jianli Wang, Hua Liu
Electrochemical Behavior Of Mn3sn2 As Anode For Lithium Ion Batteries, Li Li, Rong Zeng, Christopher Cook, Zaiping Guo, Jianli Wang, Hua Liu
Jianli Wang
No abstract provided.
Flexible Free-Standing Graphene-Silicon Composite Film For Lithium-Ion Batteries, Jiazhao Wang, Chao Zhong, Shulei Chou, Hua Liu
Flexible Free-Standing Graphene-Silicon Composite Film For Lithium-Ion Batteries, Jiazhao Wang, Chao Zhong, Shulei Chou, Hua Liu
Shulei Chou
Flexible, free-standing, paper-like, graphene-silicon composite materials have been synthesized by a simple, one-step, in-situ filtration method. The Si nanoparticles are highly encapsulated in a graphene nanosheet matrix. The electrochemical results show that graphene-Si composite film has much higher discharge capacity beyond 100 cycles (708 mAh g− 1) than that of the cell with pure graphene (304 mAh g− 1). The graphene functions as a flexible mechanical support for strain release, offering an efficient electrically conducting channel, while the nanosized silicon provides the high capacity.
Nanocrystalline Nio Hollow Spheres In Conjunction With Cmc For Lithium-Ion Batteries, Chao Zhong, Jiazhao Wang, Shulei Chou, Konstantin Konstantinov, Mokhlesur Rahman, Hua Liu
Nanocrystalline Nio Hollow Spheres In Conjunction With Cmc For Lithium-Ion Batteries, Chao Zhong, Jiazhao Wang, Shulei Chou, Konstantin Konstantinov, Mokhlesur Rahman, Hua Liu
Shulei Chou
Hollow spherical NiO particles were prepared using the spray pyrolysis method with different concentrations of precursor. The electrochemical properties of the NiO electrodes, which contained a new type of binder, carboxymethyl cellulose (CMC), were examined for comparison with NiO electrodes with polyvinylidene fluoride (PVDF) binder. The electrochemical performance of NiO electrodes using CMC binder was significantly improved. For the cell made from 0.3 mol L−1 precursor, the irreversible capacity loss between the first discharge and charge is about 43 and 24% for the electrode with PVDF and CMC binder, respectively. The cell with NiO–CMC electrode has a much higher discharge …
The Effect Of Different Binders On Electrochemical Properties Of Lini1/3mn1/3c1/3o2 Cathode Material In Lithium Ion Batteries, Jiantie Xu, Shulei Chou, Qinfen Gu, Hua Liu, S Dou
The Effect Of Different Binders On Electrochemical Properties Of Lini1/3mn1/3c1/3o2 Cathode Material In Lithium Ion Batteries, Jiantie Xu, Shulei Chou, Qinfen Gu, Hua Liu, S Dou
Shulei Chou
LiNi1/3Mn1/3Co1/3O2 (NMC) as a cathode material for lithium ion batteries has been synthesized by the sol-gel method. The X-ray diffraction Rietveld refinement results indicated that single-phase NMC with hexagonal layered structure was obtained. Scanning electron microscope images revealed well crystallized NMC with uniform particle size in the range of 100-200 nm. The performance of the NMC electrodes with sodium carboxylmethyl cellulose (CMC), poly(vinylidene fluoride) (PVDF), and alginate from brown algae as binders was compared. Constant current charge-discharge test results demonstrated that the NMC electrode using CMC as binder had the highest rate capability, followed by those using alginate and PVDF …
Rapid Synthesis Of Li4ti5o12 Microspheres As Anode Materials And Its Binder Effect For Lithium-Ion Battery, Shulei Chou, Jiazhao Wang, Hua Liu, S. Dou
Rapid Synthesis Of Li4ti5o12 Microspheres As Anode Materials And Its Binder Effect For Lithium-Ion Battery, Shulei Chou, Jiazhao Wang, Hua Liu, S. Dou
Shulei Chou
Li4Ti5O12 microspheres composed of nanoflakes were synthesized within 1 h by a combination of a microwave-assisted hydrothermal method and a microwave postannealing process. The Li4Ti5O12 microspheres were characterized by X-ray diffraction, Brunauer–Emmett–Teller N2 adsorption, scanning electron microscopy, Raman spectroscopy, and transmission electron microscopy. Sodium carboxymethyl cellulose (CMC) was also investigated as a low-cost green binder. The electrochemical tests, including constant current charge–discharge, cyclic voltammetry, and electrochemical impedance spectroscopy, demonstrated that the electrode using CMC as binder had better high-rate capability than the one with polyvinylidene fluoride (PVDF) binder. The electrode using CMC and PVDF as binder had the same lithium …
Silver-Coated Tio2 Nanostructured Anode Materials For Lithium Ion Batteries, - Md. Mokhlesur Rahman, Jiazhao Wang, David Wexler, Yuyuan Zhang, Xinjun Li, Shulei Chou, Hua Liu
Silver-Coated Tio2 Nanostructured Anode Materials For Lithium Ion Batteries, - Md. Mokhlesur Rahman, Jiazhao Wang, David Wexler, Yuyuan Zhang, Xinjun Li, Shulei Chou, Hua Liu
Shulei Chou
Anatase TiO2 nanoribbons/nanotubes (TiO2-NRTs) have been synthesised successfully via a reflux method followed by drying in a vacuum oven, and then, silver-coated TiO2 NRTs (Ag/TiO2-NRTs) were prepared by coating silver particles onto the TiO2-NRTs surface by the traditional silver mirror reaction. The physical properties of the synthesised products were examined in detail using X-ray diffraction, field emission gun scanning electron microscopy, energy-dispersive X-ray spectroscopy, and transmission electron microscopy, respectively. The results indicated that the Ag nanoparticles were uniformly deposited on the surface of the TiO2 nanoribbons/nanotubes. The electrochemical properties were investigated …
Nanocrystalline Porous A-Life02-C Composite-An Environmentally Friendly Cathode For The Lithium-Ion Battery, Md Mokhlesur Rahman, Jiazhao Wang, Mohd Faiz Hassan, Shulei Chou, Zhixin Chen, Hua Liu
Nanocrystalline Porous A-Life02-C Composite-An Environmentally Friendly Cathode For The Lithium-Ion Battery, Md Mokhlesur Rahman, Jiazhao Wang, Mohd Faiz Hassan, Shulei Chou, Zhixin Chen, Hua Liu
Shulei Chou
A novel nanocrystalline porous α-LiFeO2–C composite with a high surface area of around 115 m2 g−1 has been synthesized by a simple molten salt method, followed by a carbon coating process. The structure and morphology were confirmed by X-ray diffraction, field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). FE-SEM observations demonstrated that the morphology consists of α-LiFeO2–C nanoclusters composed of very tiny nanoparticles joined together by a porous architecture. TEM investigations revealed that amorphous carbon was incorporated into the pores among the nanoparticles and that some nanoparticles were covered by a thin layer of carbon as well. …
High Capacity, Safety, And Enhanced Cyclability Of Lithium Metal Battery Using A V2o5 Nanomaterial Cathode And Room Temperature Ionic Liquid Electrolyte, Shulei Chou, Jia-Zhao Wang, Jia-Zeng Sun, David Wexler, Maria Forsyth, Hua Liu, Douglas Macfarlane, S. Dou
High Capacity, Safety, And Enhanced Cyclability Of Lithium Metal Battery Using A V2o5 Nanomaterial Cathode And Room Temperature Ionic Liquid Electrolyte, Shulei Chou, Jia-Zhao Wang, Jia-Zeng Sun, David Wexler, Maria Forsyth, Hua Liu, Douglas Macfarlane, S. Dou
Shulei Chou
V2O5 nanomaterials including nanoribbons, nanowires, and microflakes have been synthesized by an ultrasonic assisted hydrothermal method and combined with a post-annealing process. The as-annealed V2O5 nanomaterials are characterised by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) N2 adsorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high resolution transmission electron microscopy (HRTEM). A room temperature ionic liquid (RTIL) has been used as an electrolyte ([C3mpyr][NTf2] containing 1 M LiNTf2) in rechargeable lithium metal batteries by combining V2O5 nanomaterials as cathode materials. The electrochemical tests including constant current charge-discharge, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) show near theoretical specific capacity, …
Nickel Sulfide Cathode In Combination With An Ionic Liquid-Based Electrolyte For Rechargeable Lithium Batteries, Jiazhao Wang, Shulei Chou, Sau Yen Chew, Jiazeng Sun, Maria Forsyth, Douglas Macfarlane, Hua Liu
Nickel Sulfide Cathode In Combination With An Ionic Liquid-Based Electrolyte For Rechargeable Lithium Batteries, Jiazhao Wang, Shulei Chou, Sau Yen Chew, Jiazeng Sun, Maria Forsyth, Douglas Macfarlane, Hua Liu
Shulei Chou
Nickel sulfides, pure Ni3S2 and a mixture of Ni7S6-NiS, were synthesized through a solvothermal process. The nickel sulphide powders were characterised by X-ray diffraction, scanning electron microscopy, and electrochemical testing. The results showed that the capacity of NiS-Ni7S6 is much higher than that of Ni3S2, when used as the cathode in a lithium cell with an organic solvent-based electrolyte, 1 M lithium bis (trifluoromethanesulfonyl)amide (LiNTf2) in poly(ethylene glycol) dimethyl either 500. The NiS-Ni7S6 electrodes were also tested with an ionic liquid electrolyte consisting of 1 M LiNTf2 in N-methyl-N-propyl pyrrolidinium bis(trifioromethanesulfonyl)amide ([C3mpyr][NTf2]) to compare with organic-solvent based electrolytes. The result …
Electrochemical Deposition Of Porous Co3o4 Nanostructured Thin Film For Lithium-Ion Battery, Shulei Chou, Jiazhao Wang, Hua Liu, S. Dou
Electrochemical Deposition Of Porous Co3o4 Nanostructured Thin Film For Lithium-Ion Battery, Shulei Chou, Jiazhao Wang, Hua Liu, S. Dou
Shulei Chou
Porous Co3O4 nanostructured thin films are electrodeposited by controlling the concentration of Co(NO3)2 aqueous solution on nickel sheets, and then sintered at 300C for 3 h. The as-prepared thin films are characterised by thermogravimetric analysis (TGA), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The electrochemical measurements show that the highly porous Co3O4 thin film with the highest electrochemically active specific surface area (68.64 m2 g-1) yields the best electrochemical performance compared with another, less-porous film and with a non-porous film. The highest specific capacity (513 mAh g-1 after 50 cycles) is obtained from the thinnest film with Co3O4 loaded …
The Compatibility Of Transition Metal Oxide/Carbon Composite Anode And Ionic Liquid Electrolyte For The Lithium-Ion Battery, Shulei Chou, Lin Lu, Jiazhao Wang, Md Mokhlesur Rahman, Chao Zhong, Hua Liu
The Compatibility Of Transition Metal Oxide/Carbon Composite Anode And Ionic Liquid Electrolyte For The Lithium-Ion Battery, Shulei Chou, Lin Lu, Jiazhao Wang, Md Mokhlesur Rahman, Chao Zhong, Hua Liu
Shulei Chou
Three types of transition metal oxide/carbon composites including Fe2O3/C, NiO/C and CuO/Cu2O/C synthesized via spray pyrolysis were used as anode for lithium ion battery application in conjunction with two types of ionic liquid: 1 M LiN(SO2CF3)2 (LiTFSI) in 1-ethyl-3-methyl-imidazolium bis(fluorosulfonlyl)imide (EMI-FSI) or 1-methyl-1-propylpyrrolidinium bis(fluorosulfonyl)imide (Py13-FSI). From the electrochemical measurements, the composite electrodes using Py13-FSI as electrolyte show much better electrochemical performance than those using EMI-FSI as electrolyte in terms of reversibility. The Fe2O3/C composite shows the highest specific capacity and the best capacity retention (425 mAh g−1) under a current density of 50 mA g−1 for up to 50 cycles, …
Sno2-Coated Multiwall Carbon Nanotube Composite Anode Materials For Rechargeable Lithium-Ion Batteries, Lukman Noerochim, Jiazhao Wang, Shulei Chou, Huijun Li, Hua Liu
Sno2-Coated Multiwall Carbon Nanotube Composite Anode Materials For Rechargeable Lithium-Ion Batteries, Lukman Noerochim, Jiazhao Wang, Shulei Chou, Huijun Li, Hua Liu
Shulei Chou
SnO2-coated multiwall carbon nanotube (MWCNT) nanocomposites were synthesized by a facile hydrothermal method. The as-prepared nanocomposites were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). The SnO2/MWCNT composites, when combined with carboxymethyl cellulose (CMC) as a binder, show excellent cyclic retention, with the high specific capacity of 473 mAh g−1 beyond 100 cycles, much greater than that of the bare SnO2 which was also prepared by the hydrothermal method in the absence of MWCNTs. The enhanced capacity retention could be mainly attributed to …
Spray Pyrolyzed Nio-C Nanocomposite As An Anode Material For The Lithium-Ion Battery With Enhanced Capacity Retention, - Md. Mokhlesur Rahman, Shulei Chou, Chao Zhong, Jiazhao Wang, David Wexler, Hua Liu
Spray Pyrolyzed Nio-C Nanocomposite As An Anode Material For The Lithium-Ion Battery With Enhanced Capacity Retention, - Md. Mokhlesur Rahman, Shulei Chou, Chao Zhong, Jiazhao Wang, David Wexler, Hua Liu
Shulei Chou
NiO–C nanocomposite was prepared by a spray pyrolysis method using a mixture of Ni(NO3)2 and citric acid solution at 600 °C. The microstructure and morphology of the NiO–C composite were characterized by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS) mapping, and thermogravimetric analysis (TGA). The results showed that the NiO nanoparticles were surrounded by amorphous carbon. Electrochemical tests demonstrated that the NiO–C nanocomposites exhibited better capacity retention (382 mAh g− 1 for 50 cycles) than that of pure NiO (141 mAh g− 1 for 50 cycles), which was also prepared by spray pyrolysis using …
Rapid Synthesis Of Binary -Nisb-Nis By Microwave Autoclave For Rechargeable Lithium Batteries, Nurul Idris, - Md. Mokhlesur Rahman, Shulei Chou, Jiazhao Wang, David Wexler, Hua Liu
Rapid Synthesis Of Binary -Nisb-Nis By Microwave Autoclave For Rechargeable Lithium Batteries, Nurul Idris, - Md. Mokhlesur Rahman, Shulei Chou, Jiazhao Wang, David Wexler, Hua Liu
Shulei Chou
To reduce the reaction time, electrical energy consumption, and cost, binary α-NiS–β-NiS has been synthesized by a rapid, one-pot, hydrothermal autoclave microwave method within 15 min at temperatures of 160–180 °C. The microstructure and morphology of the α-NiS–β-NiS products were characterized by means of X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and transmission electron microscopy (TEM). At 140 °C, pure hexagonal NiAs-type α-NiS phase was identified from the XRD patterns. With increasing reaction temperature (160–180 °C), the XRD evidence indicates that an increasing fraction of rhombohedral millerite-like β-NiS is formed as a secondary phase. The α-NiS–β-NiS sample synthesized …