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Positive-electrode material of metal hydride nickle sealed secondary cell

A technology of secondary battery and positive electrode material, which is applied in the direction of alkaline battery electrode, secondary battery, airtight battery, etc. problems such as service life and internal resistance, to achieve the effect of extending cycle life, excellent high-rate discharge performance, and reducing ohmic internal resistance

Inactive Publication Date: 2003-08-27
ZHEJIANG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the additives used are conventional carbon materials such as acetylene black and conductive graphite, which have high internal resistance and are easy to fall off during charging and discharging, which reduces the cycle stability and cycle life of metal hydride nickel-sealed alkaline secondary batteries.

Method used

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  • Positive-electrode material of metal hydride nickle sealed secondary cell

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Embodiment

[0011] The positive electrode material composition of the metal hydride nickel sealed alkaline secondary battery contains (by weight): 0.8% multi-walled carbon nanotubes (CNTs), 6.4% CoO, 0.7% Co, remaining β-Ni(OH) 2 . Composition of multi-walled carbon nanotubes and spherical β-Ni(OH) 2 , CoO and Co powders were mixed in proportion, and after ultrasonic oscillation and mechanical stirring for 60 min, the multi-walled carbon nanotubes, CoO and Co powders were mixed in β-Ni(OH) 2 Evenly dispersed in the powder. After adding a small amount of CMC and PTFE binders and water, the uniformly mixed powder is coated on the nickel foam of the current collector, dried and pressed to prepare positive electrodes of different sizes.

[0012] Cut the nickel foam positive plate into shape, the size is: 86×40×0.66mm 3 ; The negative electrode is dry pressed and formed on the copper grid to add oxygen catalyst AB 5 Type hydrogen storage alloy, the excess capacity of the negative electrode...

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Abstract

The material of the positive electrode contains 0.1-3.7 nano carbon tubes with multiple walls, 4.8-8.7% CoO, 0.1-1.7% C0 and the rest as beta-Ni(OH)2. The batteries prepared by using said material possessing the excellent high powered discharge capability, good cyclical stability, low internal resistance and intrinsic voltage can be utilized to drive electric tools, vehicles, toys and household electrical appliances etc.

Description

technical field [0001] The invention relates to a metal hydride nickel sealed alkaline secondary battery positive electrode material. Background technique [0002] Metal hydride nickel (Ni / MH) batteries use metal hydride as the negative electrode material, nickel hydroxide (Ni(OH) 2 ) is a non-environmentally polluting secondary battery of positive electrode material. In order to further improve the charge-discharge performance, cycle life and safety reliability during use of metal hydride nickel sealed alkaline secondary batteries, appropriate additives are usually added to electrode materials. At present, the additives used are conventional carbon materials such as acetylene black and conductive graphite, which have high internal resistance and are easy to fall off during charging and discharging, which reduces the cycle stability and cycle life of metal hydride nickel-sealed alkaline secondary batteries. . [0003] Multi-walled carbon nanotube...

Claims

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Application Information

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IPC IPC(8): H01M4/24H01M4/32H01M4/36H01M4/52H01M4/62H01M10/34
CPCY02E60/124H01M4/32H01M2004/028H01M10/345H01M4/625H01M4/36Y02E60/10
Inventor 涂江平张文魁吕骥余杰俞光海张孝彬郦征宇周国凡
Owner ZHEJIANG UNIV
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