The Experts below are selected from a list of 70248 Experts worldwide ranked by ideXlab platform
Dianlong Wang - One of the best experts on this subject based on the ideXlab platform.
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preparation and performance of lead foam grid for negative electrode of vrla battery
Materials Chemistry and Physics, 2006Co-Authors: Changsong Dai, Dianlong Wang, Bin Zhang, Bin ZhangAbstract:Abstract Lead (alloy) foam was prepared via electrodeposition by using copper foam as the substrate and adding element cerium to the electrodepositing solution under ultrasonic treatment. The performances and morphology of the lead foam were investigated by means of SEM and AFM. The results show that because of the addition of cerium and the application of ultrasound, the distribution thickness ratio (DTR) of the lead foam is decreased. The lead foam has a uniform three-dimensional reticulate structure with a specific surface area of about 5700 m 2 m −3 , a porosity of about 88.1%, and an apparent resistivity of about 150 μΩ cm −1 . The results of the cyclic voltammetry indicate that the lead foam has a good stability when it is used as the negative electrode Material of a lead acid battery. The battery testing revealed that, at 5, 2 h and high current discharge rates, there are improvements of 28.5%, 29.5% and 20.4% in the negative active Material Utilization efficiencies with the lead-foam VRLAB compared with the cast grid one and the mass specific capacities of the lead foam negative electrode are 36%, 44% and 33% higher than those of the cast grid one.
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effects of lead foam grids on performance of vrla battery
Journal of Power Sources, 2006Co-Authors: Changsong Dai, Dianlong WangAbstract:Abstract Lead-foam grids have been prepared by electrodepositing lead on a copper-foam substrate that has good conductibility and a symmetrically three-dimensional reticulated structure. VRLA batteries with lead foam as the negative electrode current collector Material have been fabricated; the effects of the lead foam on the specific capacity, the active Material Utilization efficiency and the negative active Material transformation process of the VRLA batteries have been studied. The results show that a lead-foam grid has a bigger specific surface area than a cast grid. The charge voltage of a VRLA battery with a lead-foam negative electrode is significantly lower than that of a VRLA battery with a cast grid electrode during a charge process. The discharge capacity, the mass specific capacity, and the active Material Utilization efficiency of a VRLA battery with a lead-foam electrode can be greatly improved at different states of discharge. The EIS research revealed that a lead-foam negative electrode has higher electrochemical reactivity. Observed by means of a scanning electron microscope, it was found that the spongy Pb crystals at a lead-foam grid negative electrode are smaller than that of a cast grid negative electrode at a state of charge; while the PbSO 4 crystals are smaller than that of a cast grid negative electrode at a state of discharge.
Changsong Dai - One of the best experts on this subject based on the ideXlab platform.
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preparation and performance of lead foam grid for negative electrode of vrla battery
Materials Chemistry and Physics, 2006Co-Authors: Changsong Dai, Dianlong Wang, Bin Zhang, Bin ZhangAbstract:Abstract Lead (alloy) foam was prepared via electrodeposition by using copper foam as the substrate and adding element cerium to the electrodepositing solution under ultrasonic treatment. The performances and morphology of the lead foam were investigated by means of SEM and AFM. The results show that because of the addition of cerium and the application of ultrasound, the distribution thickness ratio (DTR) of the lead foam is decreased. The lead foam has a uniform three-dimensional reticulate structure with a specific surface area of about 5700 m 2 m −3 , a porosity of about 88.1%, and an apparent resistivity of about 150 μΩ cm −1 . The results of the cyclic voltammetry indicate that the lead foam has a good stability when it is used as the negative electrode Material of a lead acid battery. The battery testing revealed that, at 5, 2 h and high current discharge rates, there are improvements of 28.5%, 29.5% and 20.4% in the negative active Material Utilization efficiencies with the lead-foam VRLAB compared with the cast grid one and the mass specific capacities of the lead foam negative electrode are 36%, 44% and 33% higher than those of the cast grid one.
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effects of lead foam grids on performance of vrla battery
Journal of Power Sources, 2006Co-Authors: Changsong Dai, Dianlong WangAbstract:Abstract Lead-foam grids have been prepared by electrodepositing lead on a copper-foam substrate that has good conductibility and a symmetrically three-dimensional reticulated structure. VRLA batteries with lead foam as the negative electrode current collector Material have been fabricated; the effects of the lead foam on the specific capacity, the active Material Utilization efficiency and the negative active Material transformation process of the VRLA batteries have been studied. The results show that a lead-foam grid has a bigger specific surface area than a cast grid. The charge voltage of a VRLA battery with a lead-foam negative electrode is significantly lower than that of a VRLA battery with a cast grid electrode during a charge process. The discharge capacity, the mass specific capacity, and the active Material Utilization efficiency of a VRLA battery with a lead-foam electrode can be greatly improved at different states of discharge. The EIS research revealed that a lead-foam negative electrode has higher electrochemical reactivity. Observed by means of a scanning electron microscope, it was found that the spongy Pb crystals at a lead-foam grid negative electrode are smaller than that of a cast grid negative electrode at a state of charge; while the PbSO 4 crystals are smaller than that of a cast grid negative electrode at a state of discharge.
Zhan Lin - One of the best experts on this subject based on the ideXlab platform.
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in situ wrapping si nanoparticles with 2d carbon nanosheets as high areal capacity anode for lithium ion batteries
ACS Applied Materials & Interfaces, 2017Co-Authors: Lijing Yan, Jie Liu, Qianqian Wang, Minghao Sun, Zhanguo Jiang, Chengdu Liang, Feng Pan, Zhan LinAbstract:Silicon (Si) has aroused great interest as the most attractive anode candidate for energy-dense lithium-ion batteries (LIBs) in the past decade because of its significantly high capacity and low discharge potential. However, the large volume change during cycling impedes its practical application, which is more serious in the case of high mass loading. Designing Si anode with high mass loading and high areal capacity by a simple, scalable, and environmentally friendly method is still a big challenge. Herein, we report in situ one-pot synthesis of Si/C composite, where Si nanoparticles are wrapped by graphene-like 2D carbon nanosheets. After 500 cycles at 420 mA g–1, the Si/C anode displays a gravimetric capacity of 881 mAh g–1 with 86.4% capacity being retained. More specially, a high areal capacity of 3.13 mAh cm–2 at 5.00 mg cm–2 after 100 cycles is achieved. This study demonstrates a novel route for the preparation of the Si/C composite with high Material Utilization and may expand the possibility of f...
S. Ambalavanan - One of the best experts on this subject based on the ideXlab platform.
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An in situ generated carbon as integrated conductive additive for hierarchical negative plate of lead-acid battery
Journal of Power Sources, 2014Co-Authors: M Saravanan, M Ganesan, S. AmbalavananAbstract:Abstract In this work, we report an in situ generated carbon from sugar as additive in the Negative Active Mass (NAM) which enhances the charge–discharge characteristics of the lead-acid cells. In situ formed sugar derived carbon (SDC) with leady oxide (LO) provides a conductive network and excellent protection against NAM irreversible lead sulfation. The effect of SDC and carbon black (CB) added negative plates are characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), galvanostatic charge–discharge, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), respectively. The results show that subtle changes in the addition of carbon to NAM led to subsequent changes on the performance during partial-state-of-charge (PSoC) operations in lead-acid cells. Furthermore, SDC added cells exhibit remarkable improvement in the rate capability, active Material Utilization, cycle performance and charge acceptance compared to that of the conventional CB added cells. The impact of SDC with LO at various synthesis conditions on the electrochemical performance of the negative plate is studied systematically.
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multi walled carbon nanotubes percolation network enhanced the performance of negative electrode for lead acid battery
Journal of The Electrochemical Society, 2013Co-Authors: M Saravanan, P Sennu, M Ganesan, S. AmbalavananAbstract:The discharge performance of lead-acid battery is improved by adding multi-walled carbon nanotubes (MWCNTs) as an alternate conductive additive in Negative Active Mass (NAM).We report thatMWCNTs added to the negative electrode, exhibits high capacity, excellent cycling performances at 10-h rate, high rate partial state of charge (HRPSoC) cycling and various rates of discharge. It significantly reduces the irreversible lead sulfate on the NAM, increases the active Material Utilization and improves the electrode performance. The improvement of capacity and cyclic performance of the cell is attributed to the nanoscale dimension of the MWCNTs as additive. Subsequent characterization using high resolution transmission electron microscopy and scanning electron microscopy were carried out to understand the influence of MWCNTs on the negative electrode of lead-acid battery.
Daining Fang - One of the best experts on this subject based on the ideXlab platform.
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thick electrodes upon biomass derivative carbon current collectors high areal capacity positive electrodes for aluminum ion batteries
Electrochimica Acta, 2019Co-Authors: Ya Chen, Zhili Zhou, Shuqiang Jiao, Haosen Chen, Weili Song, Daining FangAbstract:Abstract Rechargeable aluminum-ion batteries (AIBs) are considered as low-cost safe energy storage devices beyond lithium-ion batteries, due to the high volumetric capacity and rich abundance of aluminum. However, the highly corrosive room temperature ionic liquid electrolyte causes serious problems in the traditional metal current collectors, and electrochemical inert metals with higher density have been commonly used, which leads to dramatic decreased Material Utilization in the positive electrode. For addressing such issues, here a biomass-derivative carbon (BDC) current collector is demonstrated to construct millimeter-scale thick positive electrodes based on two types of graphite active Materials (with different planar sizes) and two electrode configurations. The results suggest the strategy of using single-side casting process with graphite of smaller planar size would be more promising to promote the overall electrochemical properties and energy storage performance. The as-assembled thick electrode (with thickness up to ∼2 mm) using the same type of graphite is able to deliver much enlarged areal loading (36 mg cm−2), showing greater areal capacity for energy storage. The strategy and mechanism in this work offers a considerable approach for improving the current collectors and promoting the graphite proportion in AIBs.