Degradation in polymer Ni-MH battery

Mohamad, Ahmad Azmin

doi:10.1007/bf02430392

Cited by 5 publications

(4 citation statements)

References 27 publications

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“…However, the next discharge capacities, nearly stable at about 331 mAh•g -1 , were higher than that of the traditional KOH electrolyte Ni-MH batteries and other relevant documents obviously. [9,21] These results revealed that the Mg 2 NiH 4 alloys, inside of the electrode, were prevented more corrosion by using the PVA/SiO 2 AMPEs than the conventional KOH aqueous electrolyte and the corrosion resistance of the whole alloys improved.…”

Section: Electrochemical Stability Measurementmentioning

confidence: 89%

Novel PVA/SiO₂Alkaline Micro-porous Polymer Electrolytes for Polymer Ni—MH Batteries

陆霞

吴仁香²,

李波波³

et al. 2013

Acta Chim. Sinica

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New poly(vinyl alcohol)/silica (designated as PVA/SiO 2) alkaline micro-porous polymer electrolytes (AMPEs) were prepared by soaking PVA/SiO 2 micro-porous composite membranes, obtained by solution casting of PVA/PEG/SiO 2 membrane in acetone solution, into an electrolyte solution of 6 mol/L KOH aqueous solution. The morphology and structure of PVA/SiO 2 composite polymer membranes were characterized by scanning electron microscopy (SEM) and X-Ray diffraction (XRD). The SEM photographs showed that the nano-SiO 2 filler content was a crucial issue for the well-dispersed and optimal-sized pores which could storage charge carrier durably. Meanwhile, the crystalline of PVA decreased effectively for a large number of crystal defects and free volume appeared in the interface of inorganic particles and polymer for the addition of nano-SiO 2 filler. The electrochemical properties of the AMPEs were measured by the alternating current impedance (AC impedance) and the cyclic voltammetry (CV) techniques. The results indicated that the PVA/SiO 2 AMPEs containing 5 ω nano-SiO 2 filler exhibited good performances at room temperature, such as 1.62×10-2 S•cm-1 for ionic conductivity and 2.20 V for electrochemical stability window. What's more, we used the gravimetric method to obtain the electrolyte uptake of various PVA/SiO 2 composite micro-porous polymer membranes. From the data, we learned that the maximum electrolyte uptake could reach to 102.7% and it had very relevance to the size of pores in PVA/SiO 2 composite polymer membranes, and then influenced the ionic conductivity. Each polymer Ni-MH battery was assembled by three parts: the new AMPE, Mg-based hydrogen storage alloy and the commercial sintered Ni(OH) 2 /NiOOH electrode, in which each part did for electrolyte and diaphragm, negative electrode and positive electrode, respectively. The cycle experiments of the batteries exhibited a high first-cycle discharge capacity of 613 mAh•g-1 and stable discharge capacities about 330 mAh•g-1 for the following 5 cycles. The results encouraged that the novel AMPEs are prospective for the applications of polymer electrolyte in Ni-MH battery field.

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Section: Electrochemical Stability Measurementmentioning

confidence: 89%

Novel PVA/SiO₂Alkaline Micro-porous Polymer Electrolytes for Polymer Ni—MH Batteries

陆霞

吴仁香²,

李波波³

et al. 2013

Acta Chim. Sinica

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“…The excess OH − ions attacked the rest of the Mg active material, converting it to the Mg(OH) 2 passive material. Mohamad et al [8,14] demonstrated that the XRD and SEM of the Mg 2 Ni-based anode, fully changed to Mg(OH) 2 upon cycling in 6 M KOH aqueous electrolyte.…”

Section: Methodsmentioning

confidence: 98%

“…The solid electrolytes that have been used such as Sb 2 O 5 .nH 2 O [1,2] and tetramethylammonium hydroxide penthydrate [3]. Meanwhile, for the alkaline solid polymer electrolytes (ASPE), those that have been reported were polyacrylamide gel [4], poly(ethylene oxide) [5], copolymer of epichlorohydrin and ethylene oxide P(ECH-co-EO) [6], polyvinyl alcohol (PVA) [7][8][9][10], poly(acrylic acid) (PAA) [11] and PVA-PEO-glass fiber mat [12].…”

Section: Introductionmentioning

confidence: 99%

Ni-MH battery based on plasticized alkaline solid polymer electrolytes

Mohamad

Arof

2007

Ionics

Self Cite

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Solid-state nickel metal hydride cells were fabricated using plasticized alkaline solid polymer electrolytes (ASPE) prepared from polyvinyl alcohol (PVA), potassium hydroxide (KOH), alumina (α-Al 2 O 3 ), and propylene carbonate (PC). The ASPE film with PVA/KOH/α-Al 2 O 3 / PC/H 2 O weight ratio of 1.00:0.67:0.09:2.64:1.32 and conductivity of (6.6±1.7)×10 −4 S cm −1 was used in fabrication of the electrochemical cells. To investigate the electrochemical properties of the plasticized ASPE, cells with the configuration Mg 2 Ni/plasticized ASPE/Ni(OH) 2 were fabricated. At the eighth cycle with a current drain of 0.1 mA and plateau voltage of ∼1.1 V, the discharge lasted for 14 h before the cell was considered to have failed. The failure mode of the cell was due to the formation of thin Mg(OH) 2 insulating layers.

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“…There is no fire hazard associated with Mg-Ni aqueous solution rechargeable batteries. Unfortunately, the high electrochemical capacity of Mg (or Mg alloy) attenuates very quickly after a dozen charging-discharging cycles due to Mg (or Mg alloys) suffering severe corrosion in an aqueous alkaline solution (4). Using a non-aqueous solid polymer electrolyte (SPE) membrane to replace the caustic alkaline solution will prevent the Mg from corroding and greatly increase the cycle life.…”

Section: Introductionmentioning

confidence: 99%

Novel Electrolyte Chemistries for Mg-Ni Rechargeable Batteries

Kane

García-Díaz

2011

ECS Trans.

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A new electrolyte chemistry is suggested to replace aqueous-based alkaline solutions for Mg-Ni rechargeable batteries that have high theoretical energy density, low cost, long cycle life, and no safety issues. The addition of potassium hydroxide and nano-sized clay particles to polyvinyl alcohol both increase conductivity to nearly 0.1 S/cm. The clay particles reduce the polymer crystallinity, thus increase conductivity; although the addition of more than 5 wt% clay actually reduces conductivity values. A mechanism is suggested for this behavior that includes the interaction of the clay with ion channels within the polymer helix.

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Degradation in polymer Ni-MH battery

Cited by 5 publications

References 27 publications

Novel PVA/SiO₂Alkaline Micro-porous Polymer Electrolytes for Polymer Ni—MH Batteries

Novel PVA/SiO₂Alkaline Micro-porous Polymer Electrolytes for Polymer Ni—MH Batteries

Ni-MH battery based on plasticized alkaline solid polymer electrolytes

Novel Electrolyte Chemistries for Mg-Ni Rechargeable Batteries

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Degradation in polymer Ni-MH battery

Cited by 5 publications

References 27 publications

Novel PVA/SiO2Alkaline Micro-porous Polymer Electrolytes for Polymer Ni—MH Batteries

Novel PVA/SiO2Alkaline Micro-porous Polymer Electrolytes for Polymer Ni—MH Batteries

Ni-MH battery based on plasticized alkaline solid polymer electrolytes

Novel Electrolyte Chemistries for Mg-Ni Rechargeable Batteries

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Product

Resources

About

Novel PVA/SiO₂Alkaline Micro-porous Polymer Electrolytes for Polymer Ni—MH Batteries

Novel PVA/SiO₂Alkaline Micro-porous Polymer Electrolytes for Polymer Ni—MH Batteries