A negative electrode material for a zinc-nickel battery and its preparation method and application

A technology of zinc-nickel battery and negative electrode material, applied in nickel battery, electrode manufacturing, battery electrode and other directions, can solve the problems of unsuitable negative electrode material for lithium ion battery, inability to perform lithium ion intercalation and deintercalation, unstable thermodynamic properties, etc. Achieve excellent electrochemical performance, stable and reliable process conditions, high energy density and power density

Active Publication Date: 2019-06-11
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the unstable thermodynamic properties, the charging product zincate and the discharging product ZnO will dissolve in the alkali solution, which will cause problems such as electrode deformation, dendrite growth, self-corrosion and passivation, and deteriorate the performance of zinc electrodes.
[0004] Patent CN104993106 A discloses a preparation method and application of basic zinc carbonate, a zinc-based composite material. The preparation material is obtained by hydrothermal reaction of zinc acetate, sodium fluoride and hexamethylenetetramine. There are potential applications, but the charge-discharge curve of the battery it gives shows that the discharge platform is 0.6V, while the discharge platform of lithium-ion batteries is 3.2-3.7V, and the basic zinc carbonate does not have a layered structure similar to graphite, so it cannot Intercalation and deintercalation of lithium ions, so basic zinc carbonate is not suitable as a negative electrode material for lithium ion batteries

Method used

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  • A negative electrode material for a zinc-nickel battery and its preparation method and application
  • A negative electrode material for a zinc-nickel battery and its preparation method and application
  • A negative electrode material for a zinc-nickel battery and its preparation method and application

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Embodiment 1

[0035] Embodiment 1, urea prepares the method for basic zinc carbonate (zinc salt is example with zinc chloride)

[0036] 1g of zinc chloride was added into 50mL of water to obtain a zinc chloride solution, a certain amount of urea (the quality of urea was 1.33g, 1.55g or 1.77g) was dissolved in 30mL of water to obtain a urea solution, and the two solutions were mixed and transferred to the reactor. React at 90°C for 12h while stirring magnetically. After the reaction is completed, filter, wash with deionized water until neutral, and dry at a temperature of 50°C to obtain basic zinc carbonate. The scanning electron microscope picture is as follows: figure 1 As shown, its XRD pattern is shown in image 3 shown.

Embodiment 2

[0037] Embodiment 2, ammonium bicarbonate prepare the method for basic zinc carbonate (zinc salt is example with zinc nitrate)

[0038] Add 1g of zinc nitrate to 50mL of water to obtain zinc nitrate solution, weigh a certain mass of ammonium bicarbonate (1.08g, 1.15g or 1.23g respectively) and dissolve it in 15mL of water, slowly add the ammonium bicarbonate solution dropwise to the zinc salt solution At the same time, magnetic stirring was carried out, and the reaction temperature was 60°C. After the dropwise addition, the reaction was continued for 2h. After the reaction is completed, filter, wash with deionized water until neutral, and dry at a temperature of 50°C to obtain basic zinc carbonate. The scanning electron microscope picture is as follows: figure 2 As shown, its XRD pattern is shown in Figure 4 shown.

Embodiment 3

[0039] Embodiment 3, basic zinc carbonate as the negative electrode sheet preparation method of active material

[0040] In this embodiment, basic zinc carbonate is mixed with carbon materials (carbon nanotubes, carbon fibers or graphene), calcium hydroxide, bismuth oxide, and binder PTFE in a ratio of 82:10:1:3:4 to form a paste , apply it to brass mesh or three-dimensional tinned copper mesh, dry, press, and cut to obtain the negative plate; the PTFE used is a commercially available PTFE water emulsion with a mass concentration of 60%, and then diluted to 0.1%wt for use , converted to pure PTFE when calculating the PTFE ratio.

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Abstract

The invention belongs to the technical field of battery materials, and discloses a negative electrode material of a zinc-nickel battery, a preparation method and application thereof. The active material in the negative electrode material of the zinc-nickel battery of the present invention is basic zinc carbonate, and the basic zinc carbonate is prepared by reacting urea or ammonium bicarbonate with zinc salt; the invention also discloses the basic zinc carbonate in the negative material of the zinc-nickel battery Paste formulation of zinc carbonate, conductive agent, additives and binders. The test results of the soft-packed NiZn battery constructed by using the basic zinc carbonate as the negative electrode active material show that when the material is used as the negative electrode material of the battery, the overall electrochemical performance of the electrode and the battery containing the material is improved. The prepared pouch battery has good coulombic efficiency and cycle life, and the energy density of the battery is 130Wh kg ‑1 , the cycle stability is not less than 1200 times.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a negative electrode material of a zinc-nickel battery, a preparation method and application thereof. Background technique [0002] Zinc-nickel secondary battery has the characteristics of high energy density, high power density, high working voltage, wide working temperature, no memory effect, etc. It is a green and high-performance secondary battery. However, the deformation of the negative electrode and the growth of zinc dendrites during the charging and discharging process shorten the service life of the battery and restrict the development of zinc-nickel secondary batteries. [0003] Traditional zinc-nickel battery negative electrodes usually use ZnO as the active material, prepare ZnO, additives, conductive agents and binders into slurry, and press them on copper foam or copper grid to prepare the electrode. The electrolyte of the zinc-nickel battery...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/58H01M4/62H01M4/28H01M4/04H01M10/30C01G9/00
CPCC01G9/00H01M4/0404H01M4/0471H01M4/28H01M4/48H01M4/5825H01M4/62H01M4/623H01M4/625H01M10/30Y02E60/10
Inventor 关明云汪冬明黄茂战王佳琪
Owner JIANGSU UNIV OF TECH
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