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Zhangjiagang, China

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

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. Source

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

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. Source

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

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. Source

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

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. Source

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

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. Source

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