Cathode material for nickel-zinc battery and nickel-zinc battery employing cathode material

A zinc-nickel battery and cathode material technology, applied in the field of energy storage, can solve the problems of low energy density, high price, consumption of acid and oxidant, etc., achieve high energy density and power density, stable and reliable process conditions, and simple process flow easy effect

Active Publication Date: 2016-03-30
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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  • Cathode material for nickel-zinc battery and nickel-zinc battery employing cathode material
  • Cathode material for nickel-zinc battery and nickel-zinc battery employing cathode material
  • Cathode material for nickel-zinc battery and nickel-zinc battery employing cathode material

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Effect test

Embodiment 1

[0027] Example 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 the 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] Example 2: Ni(OH) 2 / Carbon Nanotubes)

[0030] Ni(OH) of this embodiment 2 / Carbon nanotubes are composite materials, in which the carbon nanotubes are single-wall, double-wall or multi-wall carbon nanotubes. The diameter of the nanotubes is 50-200nm and the length is 100nm-5μm. The surface of the nanotubes is treated with carboxyl groups on the surface Oxygen-containing functional groups such as, hydroxyl and epoxy groups, Ni(OH) 2 Covalently bonded with carbon nanotubes, electrons can be quickly transferred through carbon nanotubes during charging and discharging. The composite material is a 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 this embodiment 2 / Nanofibers are composite materials, where the diameter of the nanofibers is 50-200nm, and the length is 500nm-5μm. The surface of the nanofibers is treated, and the surface has oxygen-containing functional groups such as carboxyl, hydroxyl and epoxy groups, Ni(OH) 2 It is covalently bonded with carbon nanofibers, and electrons can be quickly transferred through carbon nanofibers during 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 particularly 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] The 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 environmentally friendly high-performance secondary battery. Zinc-nickel batteries have many outstanding advantages, but there are still no large-scale applications. This is because NiZn batteries have the following shortcomings: (1) Low energy density: The theoretical energy density of NiZn batteries is 372Wh / kg, but now commercial NiZn batteries are 75-85Wh / kg, which has a lot of room for improvement; 2) Limited number of cycles: When the energy density is 75-85Wh / k...

Claims

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Application Information

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Patent Type & Authority Applications(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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