Positive electrode of nickel-hydrogen secondary battery added with carbon gas gel

A carbon aerogel and secondary battery technology, applied in the field of electrodes, can solve the problems of low electrode exchange current density, powdering and falling off of active materials, poor conductivity, etc., achieve high discharge voltage platform, improve conductivity, and improve performance Effect

Inactive Publication Date: 2007-03-21
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nickel-metal hydride secondary battery adopts micron spherical β-Ni(OH) 2 As the positive active material, due to the spherical β-Ni(OH) 2 The conductivity is poor, and there is volume expansion and contraction in the process of interconversion with β-NiOOH, so it will lead to low electrode exchange current density, severe polarization, and active material powdering and falling off. [1]

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The carbon airgel used in this example is made of resorcinol and formaldehyde as raw materials (molar ratio 1:2), polycondensation reaction occurs under the condition of sodium carbonate as a catalyst, and then carbonized at high temperature. Surface area over 600m 2 / g. The positive electrode of the nickel-hydrogen secondary battery prepared in this embodiment contains 0.1% of the above-mentioned carbon aerogel, 8% of cobaltous oxide, 3.4% of Zn powder, and spherical β-Ni(OH) 2 . Mix the carbon airgel, cobaltous oxide and spherical nickel hydroxide in the above mass ratio, add 0.5% sodium carboxymethylcellulose, 3.5% polytetrafluoroethylene and deionized water, and ultrasonically oscillate and stir in vacuum Mix evenly, and make Ni-MH battery positive electrode through processes such as drying, powder cleaning, rolling, spot welding, and shearing. Put the prepared positive electrode into a glass tee tube as a working electrode; prepare a nickel sheet of the same are...

Embodiment 2

[0035] Ohmic impedance

[0036] It can be seen from Table 2 that, compared with Example 1, the ohmic impedance of the positive electrode containing 0.3% of the Ni-MH battery is lower, and the discharge specific capacity is higher; the capacity decay is slower, and the cycle stability is better; the discharge platform and oxygen evolution potential are also improved. .

Embodiment 3

[0038] Ohmic impedance

[0039] It can be seen from the above table that compared with Example 2, the ohmic impedance of the positive electrode of the nickel-hydrogen battery containing 0.5% is further reduced; the discharge specific capacity is further improved, and the increase is obvious; the capacity decline is only 1.5g / cycle, indicating that the electrode cycle stability is better; The discharge platform was further increased to 0.375V; the oxygen evolution potential was also significantly improved.

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Abstract

This invention relates to the positive of a NiH secondary cell added with carbon gel in the following components and weight content: carbon gel: 0.1-1%, cobaltous oxide: 3-12%, Zn: 2.1-6.5%, Teflon: 1.0-4.5%, carboxymethylcellulose sodium: 0.1-1.2% and spherical beta-Ni(OH)2, which can be widely used in high rate, high capacitance and high temperature NiH sealing alkali secondary cells.

Description

technical field [0001] The invention relates to an electrode used in the field of battery technology, in particular to a positive electrode of a nickel-hydrogen secondary battery added with carbon aerogel. Background technique [0002] Nickel-metal hydride secondary battery is one of the most widely used secondary batteries at present. Its energy density is 1.5~2.0 times that of cadmium-nickel battery, and its volume energy density is comparable to that of lithium-ion battery. , no environmental pollution. Nickel-metal hydride secondary batteries use micron-sized spherical β-Ni(OH) 2 As the positive active material, due to the spherical β-Ni(OH) 2 The conductivity is poor, and there is volume expansion and contraction in the process of interconversion with β-NiOOH, so it will lead to low electrode exchange current density, severe polarization, and active material powdering and falling off. [1] . In order to improve the charge-discharge performance, cycle stability, and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/32H01M4/62H01M4/52
CPCY02E60/124Y02E60/10
Inventor 余震吴建波尹桂林
Owner SHANGHAI JIAO TONG UNIV
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