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Cathode material of zinc-nickel secondary batteries and preparation method thereof

A technology for secondary batteries and negative electrode materials, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of zinc electrode deformation, affecting discharge capacity, and limited effect.

Inactive Publication Date: 2008-04-09
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Repeated charge and discharge cycles will aggravate this phenomenon, resulting in deformation of the zinc electrode and affecting the discharge capacity
In addition, part of the zincate does not deposit on the zinc electrode during charging, but deposits on the outside of the electrolyte and in the diaphragm, forming dendrites, which easily penetrate the battery diaphragm and cause an internal short circuit of the battery, reducing the cycle life and affecting the battery cycle. Stability and Charging Efficiency
[0003] According to the root cause of the dendrite and deformation problems of zinc-nickel secondary batteries is the dissolution of ZnO in the alkaline electrolyte, domestic and foreign researchers have proposed to inhibit the dissolution of ZnO to improve the life of zinc-nickel batteries, such as adding Ca( Oh) 2 additives, but the electrode additives themselves and their addition methods cannot fundamentally prevent ZnO from entering the electrolyte, so the effect is limited

Method used

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  • Cathode material of zinc-nickel secondary batteries and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Take 8g ZnO, 1g SnCl 2 , 0.44g metal Zn powder and 0.088g nano-carbon fiber, the SnCl 2 Dissolve in concentrated HCl until completely dissolved, then dilute with deionized water to make SnCl 2 The concentration is 6.5g / L, add ZnO, fully stir, filter, wash, centrifuge to get Sn 6 o 4 (OH) 4 Surface modification ZnO, Sn 6 o 4 (OH) 4 The mass percent content is 10%, the Sn 6 o 4 (OH) 4 The surface modified ZnO is fully mixed with metal Zn powder and nano carbon fiber to obtain the negative electrode material of the zinc-nickel secondary battery. Add a small amount of PTFE, CMC and PVA to the uniformly mixed material as a binder, stir it with deionized water evenly, and then apply it to the collector foam nickel, after drying, pressing, and shearing, the size is: 20×20 ×0.4mm 3 , made of zinc electrodes.

Embodiment 2

[0014] Take 5g ZnO, 0.625g SnCl 2 , 0.55g metal Zn powder and 0.08g nano-carbon fiber, the SnCl 2 Dissolve in concentrated HCl until completely dissolved, then dilute with deionized water to make SnCl 2 The concentration is 6.5g / L; add ZnO, fully stir, filter, wash, and centrifuge to obtain Sn 6 o 4 (OH) 4 Surface modification ZnO, Sn 6 o 4 (OH) 4 The mass percent content is 10%, the Sn 6 o 4 (OH) 4 The surface modified ZnO is fully mixed with metal Zn powder and nano carbon fiber to obtain the negative electrode material of the zinc-nickel secondary battery. Add a small amount of PTFE, CMC and PVA to the uniformly mixed material as a binder, stir it with deionized water evenly, and then apply it to the collector foam nickel, after drying, pressing, and shearing, the size is: 20×20 ×0.4mm 3 , made of zinc electrodes.

Embodiment 3

[0016] Take 10g ZnO, 1.25g SnCl 2 , 1.65g metal Zn powder and 0.11g nano-carbon fiber, the SnCl 2 Dissolve in concentrated HCl until completely dissolved, then dilute with deionized water to make SnCl 2 The concentration is 6.5g / L; add ZnO, fully stir, filter, wash, and centrifuge to obtain Sn 6 o 4 (OH) 4 Surface modification ZnO, Sn 6 o 4 (OH) 4 The mass percent content is 10%, the Sn 6 o 4 (OH) 4 The surface modified ZnO is fully mixed with metal Zn powder and nano carbon fiber to obtain the negative electrode material of the zinc-nickel secondary battery. Add a small amount of PTFE, CMC and PVA to the uniformly mixed material as a binder, stir it with deionized water evenly, and then apply it to the collector foam nickel, after drying, pressing, and shearing, the size is: 20×20 ×0.4mm 3 , made of zinc electrodes.

[0017] The positive electrode of all embodiments is the β-Ni(OH) that is pasted and pressed on foamed nickel 2 Electrodes, the capacity of the posi...

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Abstract

The invention discloses a negative material of a zinc-nickel rechargeable battery which is a composite material containing Sn6O4(OH)4-surface-modified ZnO, metal Zn powder and nano-carbon fiber, the quality percentage is 85-95 percent and 4-13 percent for Sn6O4(OH)4-surface-modified ZnO and metal Zn powder respectively, and the rest is for nano-carbon fiber, wherein the quality percentage of Sn6O4(OH)4 in ZnO is 1-25 percent. PTFE, CMC and PVA are added in the present negative material as binder, stirred uniformly with deionized water and then coated in the current collector foam nickel, and by the processes of drying and pressing, a Zn cathode is fabricated. By using the material to fabricate zinc-nickel rechargeable batteries, the batteries have long service life, stable circulation performance, and can be applied to electric tools, transportation means, electric toys, household appliances, communication instruments and lighting equipment etc.

Description

technical field [0001] The invention relates to a negative electrode material of a zinc-nickel secondary battery and a preparation method thereof. Background technique [0002] Zinc-nickel secondary batteries have the advantages of high specific energy, high specific power, rich raw materials, low cost and no environmental pollution. Compared with lead-acid batteries, nickel-cadmium batteries, and nickel-hydrogen batteries, they are ideal green power sources. However, the cycle life of zinc-nickel secondary batteries is short, which limits the wide application of such batteries. The deformation and dendrite growth of the negative zinc electrode are the main reasons for the short cycle life of the battery. The discharge product ZnO or Zn(OH) of the zinc electrode 2 It can dissolve into the alkaline electrolyte and has a high solubility. The resulting zincate tends to the middle and lower parts of the battery due to its high density, and is reductively deposited on the middl...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/04
CPCY02E60/12Y02E60/10
Inventor 涂江平马敏徐彪袁永锋
Owner ZHEJIANG UNIV
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