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Ultrahigh-capacity zinc-cobalt battery positive electrode and self-activation preparation method thereof

A zinc-cobalt battery, self-activation technology, applied to battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of low actual capacity, low utilization rate of zinc-cobalt battery positive electrode materials, etc., to achieve enhanced valence conversion capability, electrolytic Uniform liquid distribution and improved wettability

Active Publication Date: 2022-01-11
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of low actual capacity caused by the low utilization rate of the positive electrode material of the zinc-cobalt battery, the present invention provides an ultra-high capacity zinc-cobalt battery positive electrode and its Self-activating preparation method for high electrochemical performance of batteries

Method used

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  • Ultrahigh-capacity zinc-cobalt battery positive electrode and self-activation preparation method thereof
  • Ultrahigh-capacity zinc-cobalt battery positive electrode and self-activation preparation method thereof
  • Ultrahigh-capacity zinc-cobalt battery positive electrode and self-activation preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] A self-activating preparation method for an ultra-high-capacity zinc-cobalt battery positive electrode:

[0050] (1) Assemble the traditional cobalt tetraoxide electrode into a zinc-cobalt battery with an air permeability of 75%. The preparation method of the traditional cobalt tetraoxide nanosheet electrode is: dissolve 0.5mmol cobalt nitrate hexahydrate, 4.5mmol ammonium fluoride and 8mmol urea in 40mL In deionized water, stir for 5 minutes to prepare the precursor solution, and pour it into a 50mL hydrothermal kettle lined with polytetrafluoroethylene; place the foamed nickel current collector in the hydrothermal kettle and completely submerge it in the precursor solution , close the hydrothermal kettle, and heat it at a temperature of 120°C for 9 hours to prepare a current collector loaded with a precursor; wash the current collector loaded with a precursor, dry it at a temperature of 60°C for 3 hours, and place it in a muffle furnace. Raise the temperature to 350°C...

Embodiment 2

[0056] A self-activating preparation method for an ultra-high-capacity zinc-cobalt battery positive electrode:

[0057] (1) Assembling the traditional cobalt tetroxide electrode into a zinc-cobalt battery with an air permeability of 75%, the preparation method of the traditional cobalt tetroxide electrode is the same as in Example 1;

[0058] (2) Charge and discharge the zinc-cobalt battery with a current density of 3.0A / g, and the charge and discharge times are each 15 minutes;

[0059] (3) 100 self-activation cycles under the charging and discharging conditions of step (2) to obtain an ultra-high-capacity zinc-cobalt battery electrode.

[0060] The ultra-high-capacity zinc-cobalt battery positive electrode prepared in this example shows the low-magnification microscopic morphology of the scanning electron microscope. Figure 7 , the high-magnification microscopic topography of scanning electron microscope is shown in Figure 8 , and the low-magnification microscopic morpho...

Embodiment 3

[0063] A self-activating preparation method for an ultra-high-capacity zinc-cobalt battery positive electrode:

[0064] (1) Assembling the traditional cobalt tetroxide electrode into a zinc-cobalt battery with an air permeability of 75%, the preparation method of the traditional cobalt tetroxide electrode is the same as in Example 1;

[0065] (2) Charge and discharge the zinc-cobalt battery with a current density of 3.0A / g, and the charge and discharge times are each 15 minutes;

[0066] (3) 150 self-activation cycles under the charging and discharging conditions of step (2) to obtain an ultra-high-capacity zinc-cobalt battery electrode.

[0067] In this example, a material with a multi-level nanosheet structure is obtained. The first-level nano-sheet structure uniformly covers the surface of the nickel foam with a length of 10 μm, and the thickness of the second-level ultrafine nano-sheet is 4 nm. After 150 self-activation cycles, the discharge capacity of the zinc-cobalt se...

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Abstract

The invention discloses an ultrahigh-capacity zinc-cobalt battery positive electrode and a self-activation preparation method thereof, and belongs to the technical field of zinc-cobalt batteries, the ultrahigh-capacity zinc-cobalt battery positive electrode has a two-stage ultrafine nanosheet structure, the length of a first-stage nanosheet is 10 [mu] m, and the thickness of a second-stage ultrafine nanosheet is 1.7-6 nm; the zinc-cobalt battery positive electrode is used in a zinc-cobalt battery, and the discharge capacity of the battery can reach 402.5-482.2 mAh / g. According to the ultrahigh-capacity zinc-cobalt battery positive electrode disclosed by the invention, a secondary superfine nanosheet structure creates an ultrahigh specific surface with a large number of active sites and a porous structure which is beneficial to material and electron transmission and electrolyte permeation, the electron transfer capability in the charge-discharge process is enhanced, and the discharge capacity can reach 482.2 mAh / g when the battery positive electrode is used in a zinc-cobalt battery.

Description

technical field [0001] The invention relates to the technical field of zinc-cobalt batteries, in particular to an ultra-high-capacity zinc-cobalt battery positive electrode and a self-activating preparation method thereof. Background technique [0002] A zinc-cobalt battery is a battery that uses metal zinc as the negative electrode, cobalt-based oxides as the positive electrode, and neutral or alkaline aqueous solution as the electrolyte. During discharge, the dissolution of metal zinc and the reduction reaction of cobalt-based oxides occur in the battery; while during charging, the deposition of metal zinc and the oxidation reaction of cobalt-based oxides occur. Thus, the battery can be charged and discharged multiple times. Zinc-cobalt battery has a high discharge voltage (~1.8V), energy density can reach 500Wh / kg, and the electrode and electrolyte materials are safe, so it is considered to be a battery with great development potential. [0003] Since cobalt tetroxide (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M10/36B82Y40/00
CPCH01M4/523H01M10/36B82Y40/00H01M2004/028Y02E60/10
Inventor 谈鹏尚文旭俞文涛马彦义何义
Owner UNIV OF SCI & TECH OF CHINA
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