Improved Commercialized Lithium Titanate Performance in  Lithium-ion Batteries by Annealing

Hydrolysis of Al and NaBH4 for hydrogen generation has obtained considerable attention as a portable hydrogen source system. In this paper, we report a new combined hydrogen generation from Al powder and alkaline NaBH4 solution activated by NiCl2 additive. The system is characterized as the followed features: the interaction of Al/NaBH4 hydrolysis, catalytic effect of Ni2B for Al and NaBH4, Al hydrolysis stimulated by NaOH solution. The effects which affect the hydrogen generation performance of the system were studied. The results showed that a favorable combination of high hydrogen yield and high hydrogen generation rate might be obtained via the optimized composition design. Therefore, the system may be developed as a portable hydrogen source system.

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Accelerated Hydrolysis of Solid-state NaBH4/Al System by Co2B Milled with Li for Hydrogen Generation

Journal of New Materials for Electrochemical Systems ◽

10.14447/jnmes.v19i2.338 ◽

2016 ◽

Vol 19 (2) ◽

pp. 109-115

Author(s):

Jiasong Chang ◽

Wenlong Song ◽

Ting Li ◽

Jindan Chen ◽

Hanmei Wu ◽

...

Keyword(s):

Milling Time ◽

Hydrogen Generation ◽

Synergetic Effect ◽

Hydrogen Yield ◽

Preparation Process ◽

Preparation Technology ◽

High Hydrogen ◽

Hydrolysis Process ◽

Hydrolysis Of ◽

Li Content

Co2B catalyst was milled with Al and Li to form Al-Li-Co2B composite, and the hydrogen generation performance of Al-Li-Co2B/NaBH4 system was investigated in this study. 100% hydrogen yield was reached, and high hydrogen generation rate was regulated by optimizing the composition design and preparation technology. The improvement was attributed to the synergetic effect of Co2B and Li in the preparation process, whereas a large specific surface area was obtained with the increase in Li content, Co2B, and milling time. In addition, the catalytic activity of Co2B and LiOH from Li hydrolysis was heightened for the hydrolysis of the Al/NaBH4 system because of the addition of Al(OH)3, LiAl2(OH)7.xH2O, and NaBO2 in the hydrolysis process.

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Combination of Chemical Hydride Hydrogen Generation System with Low-Temperature PEMFCs

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.253-255.751 ◽

2012 ◽

Vol 253-255 ◽

pp. 751-759

Author(s):

Ay Su ◽

Hsiu Lu Chiang ◽

Zhen Ming Huang

Keyword(s):

Sodium Borohydride ◽

High Purity ◽

Production Efficiency ◽

Hydrogen Generation ◽

Flow Reactor ◽

Integrated System ◽

Hydrogen Yield ◽

High Hydrogen ◽

Fuel Feed ◽

Hydrolysis Of

High purity hydrogen generated by hydrolysis of sodium borohydride can be used as the fuel of PEM fuel cell and other portable device. As its high hydrogen storage capacity, controllable reaction and mild condition, hydrogen generation by catalytic hydrolysis of chemical hydride, such as sodium borohydride, has been the major focus of researches. On the threshold of the controllable of hydrogen generated by hydrolysis of sodium borohydride, the catalyst for hydrolysis of hydrogen generation (HG) is studied. First, applying chemical plating, Ru/Ni foam catalyst was prepared; then, continuous flow reactor method was used to generate hydrogen. Varied parameters, such as concentrations of NaBH4 and NaOH, flow rate of NaBH4 solution and quantity of catalyst, were inspected in this research. It was found that, the NaBH4 and NaOH concentration at 20wt% and 3wt%, fuel feed to 4 g/min, hydrogen yield of 1.72 L/min, the hydrogen production efficiency as high as 91.2%. The present hydrogen generator was integrated with a 100W PEMFC and the optimum performance of the integrated system was studied. The hydrogen produced from NaBH4 has high purity and humidity; therefore, it can be directly used as the fuel for PEMFCs, which in general require humidified hydrogen. It is found that for cell voltage above 0.6V, the performance of cell using NaBH4 hydrogen is 103.45W, versus 99.9W with cylinder hydrogen.

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Research on hydrogen generation from rapid hydrolysis of aluminum in sodium fluoride solution

E3S Web of Conferences ◽

10.1051/e3sconf/201911803048 ◽

2019 ◽

Vol 118 ◽

pp. 03048

Author(s):

Changchun Li ◽

Yuxin Wu

Keyword(s):

Hydrogen Production ◽

Kinetic Model ◽

Sodium Fluoride ◽

Hydrogen Generation ◽

Hydrogen Yield ◽

Shrinking Core Model ◽

Fluoride Solution ◽

Shrinking Core ◽

Rapid Hydrolysis ◽

Hydrolysis Of

Hydrogen generation from rapid hydrolysis of aluminum in sodium fluoride solution was investigated through a hydrolysis experiment. Rapid and instant hydrogen yield were observed using sodium fluoride as additive. The experimental results demonstrate that the increase of temperature and the amount of additives in a certain range will boost the hydrogen production. The amount of additives outside the range only has an effect on the rapid hydrolysis of the aluminum during the initial stage, but the total amount of hydrogen produced doesn’t increased significantly. Theoretical analysis of the effects of the mixing ratio and the temperature on the hydrogen production rates were performed using the shrinking core model and the kinetic model. The shrinking core model parameter a and k indicate the film change degree of porosity and thickness and the effect of time on the diffusion coefficient. the kinetic model is verified and the activation energy confirming hydrogen yield control by a molecular diffusion process. Correspondingly, mechanisms of Al corrosion in NaF solutions under low and high alkalinity were proposed, respectively.

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Lithium Titanate Aerogel for Advanced Lithium-Ion Batteries

ACS Applied Materials & Interfaces ◽

10.1021/am3002742 ◽

2012 ◽

Vol 4 (5) ◽

pp. 2318-2321 ◽

Cited By ~ 15

Author(s):

Ryan P. Maloney ◽

Hyun Joong Kim ◽

Jeffrey S. Sakamoto

Keyword(s):

Lithium Ion Batteries ◽

Lithium Ion ◽

Lithium Titanate

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Synthesis of lithium titanate/graphite-ZnO composites by solid-state method as anode material for lithium-ion batteries

10.1063/5.0001714 ◽

2020 ◽

Author(s):

Abdul Salaam ◽

A. Z. Syahrial ◽

M. R. Nugraha ◽

Faizah ◽

A. Subhan ◽

...

Keyword(s):

Solid State ◽

Lithium Ion Batteries ◽

Anode Material ◽

Lithium Ion ◽

Lithium Titanate ◽

Solid State Method ◽

State Method

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CoO-Co2P composite nanosheets as highly active catalysts for sodium borohydride hydrolysis to generate hydrogen

Functional Materials Letters ◽

10.1142/s179360472051025x ◽

2020 ◽

Vol 13 (06) ◽

pp. 2051025

Author(s):

Hongyan Liu ◽

Qianyu Shi ◽

Yumei Yang ◽

Ya-Na Yu ◽

Yan Zhang ◽

...

Keyword(s):

Sodium Borohydride ◽

Hydrogen Generation ◽

Sodium Hypophosphite ◽

X Ray Diffraction ◽

Water Displacement ◽

X Ray ◽

Highly Active ◽

Naoh Solution ◽

Adsorption Desorption ◽

Hydrolysis Of

In this paper, CoO[Formula: see text]Co2P composite nanocatalysts as highly active catalysts were successfully prepared for catalytic hydrolysis of sodium borohydride (NaBH[Formula: see text] to generate hydrogen. For catalyst preparation, pre-synthesized Co(OH)2 nanosheets were uniformly mixed with sodium hypophosphite (NaH2PO[Formula: see text] and then treated through vapor-phase phosphorization process. For characterization, field-emission scanning electron microscopy (FE-SEM), energy dispersive spectrometry (EDS), X-ray diffraction (XRD), N2 adsorption–desorption measurement and X-ray photoelectric spectroscopy (XPS) were carried out, and traditional water-displacement method was performed to measure the hydrogen generation rate (HGR). It was found that component and catalytic activity of the composites were greatly affected by the ratio of Co(OH)2 to NaH2PO2. When the ratio was 2:1, the obtained catalyst composed of CoO and Co2P presented the highest HGR up to 3.94[Formula: see text]L min[Formula: see text] g[Formula: see text] using a 2[Formula: see text]wt.% NaBH[Formula: see text][Formula: see text]wt.% NaOH solution at [Formula: see text]C, and the apparent activation energy was detected as low as 27.4[Formula: see text]kJ mol[Formula: see text]. Additionally, the optimum CoO[Formula: see text]Co2P catalyst still retains 60% of the initial activity after recycling four times.

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