Zhangjiagang, China
Zhangjiagang, China

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Zhang L.,Soochow University of China | Chai L.,Soochow University of China | Qu Q.,Soochow University of China | Shen M.,Huasheng Chemical Corporation | Zheng H.,Soochow University of China
Electrochimica Acta | Year: 2013

Chitosan was applied as the electrode binder material for a spherical graphite anode in lithium-ion batteries. Compared to using poly (vinylidene fluoride) (PVDF) binder, the graphite anode using chitosan exhibited enhanced electrochemical performances in terms of the first Columbic efficiency, rate capability and cycling behavior. With similar specific capacity, the first Columbic efficiency of the chitosan-based anode is 95.4% compared to 89.3% of the PVDF-based anode. After 200 charge-discharge cycles at 0.5C, the capacity retention of the chitosan-based electrode showed to be significantly higher than that of the PVDF-based electrode. Electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) measurements were carried out to investigate the formation and evolution of the solid electrolyte interphase (SEI) formed on the graphite electrodes. The results show that a thin, homogenous and stable SEI layer is formed on the graphite electrode surface with chitosan binder compared with that using the conventional PVDF binder. © 2013 Elsevier Ltd. All rights reserved.


Tan L.,Soochow University of China | Zhang L.,Soochow University of China | Sun Q.,Soochow University of China | Shen M.,Huasheng Chemical Corporation | And 2 more authors.
Electrochimica Acta | Year: 2013

Capacity fading of a commercial 18650 LiFePO4/graphite cell was investigated at different temperatures (25,40,50 and 60° C) until 30% of its capacity was lost. Capacity decrease of the cell is in linear relationship with cycle number and the slope of the capacity-fading line is increased by elevating temperature. The capacity-fade mechanisms were investigated by using a combination of electrochemical, structural and inductively coupled plasma (ICP) techniques. Lithium inventory loss was found to be the main cause for the capacity loss. At the end of the cycling test, the amount of lithium precipitated on the graphite anode surface was determined. Most of the consumed lithium is found on the graphite anode, especially at high temperature condition, illustrating that the majority of lithium loss was ascribed to the side reactions at the graphite anode/electrolyte interface. Fe deposition at the graphite anode surface aroused from its dissolution into the electrolyte is not significant even when the cell is cycled at 50 °C condition. © 2013 Elsevier Ltd. All rights reserved.


Zhang L.,Soochow University of China | Chai L.,Soochow University of China | Shen M.,Huasheng Chemical Corporation | Zhang X.,Huasheng Chemical Corporation | And 3 more authors.
Electrochimica Acta | Year: 2014

The effect of Li-salt mixing in Li-ion battery electrolyte based on LiPF6 in ethylene carbonate (EC) and ethyl methyl carbonate (EMC) is investigated. The addition of an appropriate amount of lithium bis(fluorosulfonyl)imide (LiFSI) into the LiPF6-based electrolyte contributes to an electrochemical improvement of the graphite anode. However, the LiFePO4 cathode is difficult to cycle in such an electrolyte due to the severe corrosion of the aluminium current collector by FSI anions. Lithium bis-oxalato borate (LiBOB) is able to passivate Al and suppress the corrosion arising from the FSI anions. An improvement of rate performance and cycling stability for both the LiFePO4 cathode and the graphite anode is obtained in 1.0 mol L-1 LiPF6/EC/EMC electrolyte containing 0.2 mol L-1 LiFSI and 0.2 mol L-1 LiBOB salts. Moreover, an excellent compatibility between the graphite anode and LiFePO 4 cathode in the ternary-salt electrolyte system is further confirmed by the full cell tests. The electrochemical performance improvement of the electrolyte resulting from Li-salt mixing provides a new way for optimization of electrolyte for high performance Li-ion batteries. © 2014 Elsevier Ltd.


Shao J.,Soochow University of China | Wan Z.,Soochow University of China | Liu H.,Soochow University of China | Zheng H.,Soochow University of China | And 3 more authors.
Journal of Materials Chemistry A | Year: 2014

Hollow Co3O4 dodecahedrons with controllable interiors are prepared through direct pyrolysis of Co-based zeolitic imidazolate framework (ZIF-67) rhombic dodecahedrons. The ball-in-dodecahedron Co 3O4 demonstrates an extremely high reversible capacity of 1550 mA h g-1 and excellent cycling stability (1335 mA h g -1 after 100 cycles), rendering it to be a promising candidate for practical application in the next generation of high-energy Li-ion batteries. This journal is © the Partner Organisations 2014.


Zhao Y.,Soochow University of China | Liu T.,Soochow University of China | Xia H.,Nanjing University of Science and Technology | Zhang L.,Soochow University of China | And 4 more authors.
Journal of Materials Chemistry A | Year: 2014

Bismuth sulfide (Bi2S3) is a promising Li-storage material due to its high gravimetric and volumetric capacities. However, this intrinsic merit has often been compromised by the poor cycle and rate capability due to the lack of structural integrity upon the Li insertion/extraction process. Here, we engineer a branch-structured bismuth sulfide-carbon nanotube (CNT) hybrid by growing Bi2S3 nanorods onto CNTs to mitigate this issue. The hierarchical Bi2S3-CNT hybrids possess high surface areas, rich porosity for electrolyte infiltration, and direct electron transport pathways, and can be employed as efficient electrode materials for Li storage. These electrochemical results show that the Bi 2S3-CNT hybrid exhibits a high reversible capacity (671 mA h g-1 at 120 mA g-1), stable cycling retention (534 mA h g-1 after 90 cycles), and remarkable rate capability (399 mA h g -1 at 3000 mA g-1), notably outperforming other reported Bi2S3 materials. Such superb Li storage capabilities suggest that the Bi2S3-CNT branches could be potential electrodes for rechargeable batteries. This journal is © the Partner Organisations 2014.


Lu F.,Soochow University of China | Cao X.,Soochow University of China | Wang Y.,Soochow University of China | Jin C.,Soochow University of China | And 2 more authors.
RSC Advances | Year: 2014

Hierarchical NiCo2O4spinel nanowire array (H-NCO-NWA) electrocatalysts have been prepared through a facile template-free co-precipitation route. The as-prepared H-NCO-NWA exhibits a mesoporous (ca. 8 nm) structure and a high specific surface area of 124 m2g-1. The assembled Li-air batteries presented lower overpotentials, reasonable specific capacity, and enhanced cyclability. This journal is © the Partner Organisations 2014.


Yun J.,Soochow University of China | Wang Y.,Soochow University of China | Gao T.,Soochow University of China | Zheng H.,Soochow University of China | And 2 more authors.
Electrochimica Acta | Year: 2015

The effects of silver hexafluorophosphate (AgPF6) as an electrolyte additive on the electrochemical behaviors of graphite anode are systematically studied by cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. The surface structure and composition of graphite electrode after electrochemical cycles are investigated through scanning electron microscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. It is found that Ag nanoparticles derived from electrochemical reduction of Ag+ are homogenously distributed on the graphite surface. Significant improvements on the discharge capacity, rate behavior, and low-temperature performance of graphite electrode are obtained. The reasons are associated with the decreased resistances of solid-electrolyte interface and charge-transfer process, which improve the electrode kinetics for Li+ intercalation/deintercalation. © 2014 Elsevier Ltd. All rights reserved.


Wan Z.,Soochow University of China | Shao J.,Soochow University of China | Yun J.,Soochow University of China | Zheng H.,Soochow University of China | And 3 more authors.
Small | Year: 2014

Monodisperse sulfonated polystyrene (SPS) microspheres are employed as both the template and carbon source to prepare MoS2 quasi-hollow microspheres-encapsulated porous carbon. The synthesis procedure involves the hydrothermal growth of MoS2 ultrathin nanosheets on the surface of SPS microspheres and subsequent annealing to remove SPS core. Incomplete decomposition of SPS during annealing due to the confining effect of MoS2 shells leaves residual porous carbon in the interior. When being evaluated as the anode materials of Li-ion batteries, the as-prepared C@MoS2 microspheres exhibit excellent cycling stability (95% of capacity retained after 100 cycles) and high rate behavior (560 mAh g-1 at 5 A g-1). © 2014 Wiley-VCH Verlag GmbH & Co. KGaA.


Qu Q.,Soochow University of China | Gao T.,Soochow University of China | Zheng H.,Soochow University of China | Li X.,Soochow University of China | And 3 more authors.
Carbon | Year: 2015

This work presents the self-assembly growth of metal organic frameworks (ZIF-67) dodecahedrons on graphene oxides (GO) nanosheets. Ultrafine Co3O4 nanocrystallites with size of less than 10 nm are uniformly spread on graphene nanosheets through pyrolysis of GO/ZIF-67. The relative mass ratio of graphene to Co3O4 is controlled by adjusting the repeated numbers of GO in precursor solutions. For application as anode material of Li-ion batteries, graphene/Co3O4 manifests good high rate behavior (877 mAh g-1 at the current density of 5000 mA g-1) and long-term cycling stability (714 mAh g-1 after 200 cycles). © 2015 Elsevier Ltd. All rights reserved.


Cao X.,Soochow University of China | Jin C.,Soochow University of China | Lu F.,Soochow University of China | Yang Z.,Soochow University of China | And 2 more authors.
Journal of the Electrochemical Society | Year: 2014

MnCo2O4 (MCO) spinel powders have been synthesized by a sol-gel process with glucose as pore-former. The samples are characterized by XRD, SEM, BET. SEM and BET results show that MCO-700 has a porous structure and a high specific surface area of 11.1 m2 g?1. Catalytic activities of these oxides for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in 0.1MKOH solution have been studied by using a rotating ring-disk electrode (RRDE) technique. RRDE results show that MCO-700 exhibits better catalytic activity for the ORR. The ORR mainly favors a direct four electron pathway, and a maximum cathodic current density of 6.69 mA cm?2 at 2500 rpm has been obtained, which is close to that of commercial Pt/C electrocatalyst under the same testing conditions. Anodic linear scanning voltammograms results show that MCO-700 is more active for the OER. Although MCO-700 shows a stable catalytic activity for the ORR, a serious attenuation exists for the OER due to the oxidization of carbon under high potential. © 2014 The Electrochemical Society. All rights reserved.

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