Alkali secondary battery negative electrode material [Cu<x>Zn<y>Ni<z>Fe2O4] and battery employing same

A technology for secondary batteries and negative electrode materials, applied in alkaline batteries, battery electrodes, circuits, etc., can solve the problems of low utilization efficiency of active materials, restricting battery development, and poor rate performance, so as to improve charging efficiency and improve cycle stability. performance, long cycle life

Active Publication Date: 2018-02-16
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the iron negative electrode with iron ferric oxide as the main active material has always had the problems of passivation and hydrogen evolution, resulting in poor rate performance (< 2C) and low utilization efficiency of active materials (the actual gram capacity can only reach 200-300mAh / g ), seriously restricting the development of this type of battery

Method used

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  • Alkali secondary battery negative electrode material [Cu&lt;x&gt;Zn&lt;y&gt;Ni&lt;z&gt;Fe2O4] and battery employing same
  • Alkali secondary battery negative electrode material [Cu&lt;x&gt;Zn&lt;y&gt;Ni&lt;z&gt;Fe2O4] and battery employing same
  • Alkali secondary battery negative electrode material [Cu&lt;x&gt;Zn&lt;y&gt;Ni&lt;z&gt;Fe2O4] and battery employing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] [Cu 0.8 Zn 0.1 Ni 0.1 Fe 2 o 4 ] Preparation of negative electrode material:

[0031] Copper chloride, zinc sulfate, nickel chloride and iron sulfate are added to deionized water in a molar ratio of Cu / Zn / Ni / Fe=0.8 / 0.1 / 0.1 / 2 to prepare copper iron with a total molar concentration of 3mol / L Nickel-zinc compound salt solution; potassium hydroxide is dissolved in deionized water to prepare a potassium hydroxide solution with a molar concentration of 3mol / L; at 30°C, potassium hydroxide solution is added to the copper-iron-nickel-zinc compound salt solution to adjust the mixed solution The pH of the solution is 13, and the stirring is continued for 40 minutes; the mixed solution is transferred to a hydrothermal reaction kettle for hydrothermal reaction at 130°C for 5 hours, cooled to room temperature, filtered, washed, and dried at 80°C for 5 hours to obtain a brown powder; under a nitrogen atmosphere , the brown powder was heat-treated at 700°C for 1h, ground, and sie...

Embodiment 2

[0035] [Cu 0.5 Zn 0.3 Ni 0.2 Fe 2 o 4 ] Preparation of negative electrode material:

[0036] Add copper nitrate, zinc sulfate, nickel sulfate, and ferric chloride into deionized water in a molar ratio of Cu / Zn / Ni / Fe=0.5 / 0.3 / 0.2 / 2 to prepare copper-iron-nickel with a total molar concentration of 4mol / L Zinc compound salt solution; dissolving sodium hydroxide in deionized water to prepare a sodium hydroxide solution with a molar concentration of 4mol / L; adding the sodium hydroxide solution to the copper-iron-nickel-zinc compound salt solution at 20°C to adjust the concentration of the mixed solution The pH is 11, and the stirring is continued for 30 minutes; the mixed solution is transferred to a hydrothermal reaction kettle and subjected to a hydrothermal reaction at 150°C for 20 hours, cooled to room temperature, filtered, washed, and dried at 80°C for 5 hours to obtain a brown powder; under a nitrogen atmosphere, The brown powder was heat-treated at 600°C for 4h, ground,...

Embodiment 3

[0040] [Cu 0.6 Zn 0.3 Ni 0.1 Fe 2 o 4 ] Preparation of negative electrode material:

[0041] Copper sulfate, zinc sulfate, nickel sulfate and iron nitrate are added into deionized water in a molar ratio of Cu / Zn / Ni / Fe=0.6 / 0.3 / 0.1 / 2 to prepare a copper-iron-nickel-zinc composite with a total molar concentration of 2mol / L Salt solution; dissolving potassium hydroxide in deionized water to prepare a potassium hydroxide solution with a molar concentration of 1mol / L; adding the potassium hydroxide solution to the copper-iron-nickel-zinc composite salt solution at 30°C to adjust the pH of the mixture to 12. Stir continuously for 40 minutes; transfer the mixed solution into a hydrothermal reaction kettle for hydrothermal reaction at 170 ° C for 1 h, cool to room temperature, filter, wash, and dry at 80 ° C for 5 h to obtain a brown powder; in an air atmosphere, the brown The powder was heat-treated at 500°C for 10 hours, ground, and sieved to obtain the target product [Cu 0.6 Z...

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Abstract

The invention discloses an alkali secondary battery negative electrode material [Cu<x>Zn<y>Ni<z>Fe2O4] and a battery employing the same, and belongs to the technical field of a secondary battery negative electrode material. The alkali secondary battery negative electrode material comprises a spinel-structure composite ferrite [Cu<x>Zn<y>Ni<z>Fe2O4] or a composite material comprising the spinel-structure composite ferrite [Cu<x>Zn<y>Ni<z>Fe2O4] and a carbon material, wherein x is more than or equal to 0.5 but less than or equal to 0.95, y is more than 0 but less than 0.5, z is more than 0 but less than 0.5, and (x+y+z) is equal to 1. The invention also discloses a preparation method of the alkali secondary battery negative electrode material and application of the alkali secondary battery negative electrode material in an alkali secondary battery negative pole plate. The discharging gram capacity of the negative material prepared by the method reaches 530mAh / g at 0.2C, and the discharging gram capacity at 5C reaches 480mAh / g; and the alkali secondary battery prepared by employing the negative electrode material has the advantages of low cost, high rate performance and long cycle lifetime.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for alkaline secondary batteries, and in particular relates to a negative electrode material for alkaline secondary batteries, a preparation method thereof and a battery using the negative electrode material. Background technique [0002] Compared with lithium-ion batteries, alkaline secondary batteries (such as cadmium-nickel secondary batteries, hydrogen-nickel secondary batteries, zinc-nickel secondary batteries, and iron-nickel secondary batteries) are widely used due to their unique advantages such as good safety and high cost performance. Widely used in various energy storage devices. Due to the environmental pollution problem of the cadmium negative electrode, the application of the cadmium-nickel secondary battery in the civilian market has been limited at present. Due to the high price of hydrogen storage alloy anode active materials, the development of nickel-hydrog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/52H01M4/525H01M4/58H01M4/62H01M10/24
CPCH01M4/362H01M4/48H01M4/521H01M4/525H01M4/5825H01M4/625H01M10/24Y02E60/10
Inventor 上官恩波王芹李晶付淑倩常照荣李全民
Owner HENAN NORMAL UNIV
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