Zinc-nickel battery cathode material, preparation method thereof, and zinc-nickel battery using the cathode material

A zinc-nickel battery and cathode material technology, applied in nickel batteries, battery electrodes, alkaline batteries, etc., can solve the problems of low energy density, consumption of acid and oxidant, and high price, and achieve high energy density and power density. The process is simple and easy to operate, and the process conditions are stable and reliable.

Active Publication Date: 2019-03-19
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is because the NiZn battery has the following disadvantages: (1) low energy density: the theoretical energy density of the NiZn battery is 372Wh / kg, but now the commercial NiZn battery is 75-85Wh / kg, there is a lot of room for improvement; ( 2) Limited number of cycles: when the energy density is 75-85Wh / kg, the number of cycles is less than 500
But academically Ni(OH) 2 The disadvantages of the preparation method of carbon composite materials are (1) the modification procedure of carbon materials is very complicated, and consumes a large amount of acid and oxidant, and cannot be industrialized; (2) N,N-dimethylformamide (DMF) and Water as mixed solvent and Ni(AC) 2 Hydrolysis in a DMF-water mixture, DMF and Ni(AC) 2 The price is relatively expensive, which is not conducive to the transformation into practical application

Method used

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  • Zinc-nickel battery cathode material, preparation method thereof, and zinc-nickel battery using the cathode material
  • Zinc-nickel battery cathode material, preparation method thereof, and zinc-nickel battery using the cathode material
  • Zinc-nickel battery cathode material, preparation method thereof, and zinc-nickel battery using the cathode material

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Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1, (modification of carbon material)

[0028] The carbon material used in this embodiment is a surface-treated carbon material. The carbon material includes carbon nanotubes, nanofibers, conductive carbon black, graphene, etc., and its surface is modified with oxygen-containing functional groups such as carboxyl groups, hydroxyl groups, and epoxy groups. The interior of the carbon material remains intact and maintains good electrical conductivity.

Embodiment 2

[0029] Embodiment 2, (Ni(OH) 2 / carbon nanotubes)

[0030] Ni(OH) of the present embodiment 2 / Carbon nanotubes are composite materials, in which carbon nanotubes are single-walled, double-walled or multi-walled carbon nanotubes, the diameter of the nanotubes is 50-200nm, the length is 100nm-5μm, the surface of the nanotubes is treated, and the surface has carboxyl groups Oxygen-containing functional groups such as , hydroxyl and epoxy groups, Ni(OH) 2 Combined with carbon nanotubes by covalent bonds, electrons can be quickly transferred through carbon nanotubes when charging and discharging. The composite material is black powder and has high energy density and power density when assembled into NiZn batteries. When the density is 140-160Wh / Kg, the cycle stability reaches more than 900 times.

Embodiment 3

[0031] (Example 3, Ni(OH) 2 / nano carbon fiber)

[0032] Ni(OH) of the present embodiment 2 / Nanofiber is a composite material, wherein the diameter of the nanofiber is 50-200nm, the length is 500nm-5μm, the surface of the nanofiber is treated, and the surface has oxygen-containing functional groups such as carboxyl, hydroxyl and epoxy groups, Ni(OH) 2 Combined with carbon nanofibers by covalent bonds, electrons can be quickly transferred through carbon nanofibers when charging and discharging. The composite material is black powder and has high energy density and power density when assembled into NiZn batteries. When the density is 140-160Wh / Kg, the cycle stability reaches more than 900 times.

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Abstract

The invention discloses a preparation method of a cathode material for a nickel-zinc battery. The method comprises large-scale modification of a carbon material, so that the surface has an oxygen-containing group, and the carbon material has good dispersity in water or an organic solvent. The invention further discloses a preparation method of an Ni(OH)<2> / carbon composite material. The material is applied to a positive electrode and a Zn negative electrode to construct a soft package NiZn battery. A test result shows that the material improves the electric contact performance of the electrodes when used as an electrode material, so that the overall electrochemical properties of the electrodes and the battery including the material are improved.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and in particular relates to a method for preparing a positive electrode material of a zinc-nickel battery and a zinc-nickel battery using the positive electrode material to prepare a positive electrode sheet. Background technique [0002] Zinc-nickel secondary battery has the characteristics of high working voltage, high power density, high energy density, no memory effect, high safety index, and low production cost. It is an environment-friendly high-performance secondary battery. Zinc-nickel batteries have many outstanding advantages, but there is still no large-scale application. This is because the NiZn battery has the following disadvantages: (1) low energy density: the theoretical energy density of the NiZn battery is 372Wh / kg, but now the commercial NiZn battery is 75-85Wh / kg, there is a lot of room for improvement; ( 2) Limited cycle number: when the energy density is 75-85Wh / kg,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/52H01M4/38H01M4/36H01M4/583H01M4/62H01M10/30
CPCH01M4/362H01M4/42H01M4/52H01M4/583H01M4/625H01M10/30Y02E60/10
Inventor 关明云简妍汪冬明
Owner JIANGSU UNIV OF TECH
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