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Zinc oxide/nickel composite micron rod electrode material and preparation method thereof

A zinc oxide micron, electrode material technology, applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc., can solve the problem of low first coulombic efficiency of zinc oxide, incomplete charging reaction, and low cycle performance of zinc oxide and other problems, to achieve the effect of enhancing high-rate charge-discharge performance, improving cycle stability, and small entry and exit resistance

Active Publication Date: 2019-02-01
TAIZHOU UNIV
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Problems solved by technology

This is mainly because there are two serious problems when zinc oxide is directly used as an anode material: (1) the first coulombic efficiency of zinc oxide is low
The first coulombic efficiency of conventional zinc oxide powder electrode materials is generally lower than 50%, because the first discharge product of zinc oxide (lithium oxide and solid electrolyte membrane) cannot be completely decomposed in the subsequent first charging process, and the charging reaction is not complete.
(2) The cycle performance of zinc oxide is low
Nanostructured materials generally have a very high specific surface area, which often leads to more side reactions, which is not conducive to the improvement of the first Coulombic efficiency.

Method used

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  • Zinc oxide/nickel composite micron rod electrode material and preparation method thereof

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Embodiment

[0019] (1) The homogeneous precipitation method is used to prepare the precursor by homogeneous precipitation reaction of the mixed solution of zinc nitrate, nickel nitrate and ethylenediamine. The concentration of zinc nitrate in the solution is 0.20 mol / L, and the concentration of nickel nitrate is 0.03 mol / L, the concentration of ethylenediamine is 0.05 mol / L, and the reaction temperature is 65 o C, the reaction time is 1 h.

[0020] (2) Calcining the precursor powder obtained in step (1) in a reducing atmosphere of hydrogen-argon mixture (hydrogen-containing gas fraction 5%), the calcination temperature is 400 o C, the calcination time is 2 h, and the ZnO / Ni composite microrod electrode material is obtained.

[0021] In the prepared ZnO / Ni composite microrod electrode material, the ZnO microrod was used as the matrix, its length was 10-15 μm, its diameter was 2-3 μm, and its mass fraction was 92%; metal nickel nanoparticles were dispersed in ZnO In the microrod matrix, ...

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Abstract

The invention discloses a zinc oxide / nickel composite micron rod electrode material and a preparation method thereof. The method includes, preparing a precursor by taking a mixed solution of zinc nitrate, nickel nitrate and ethylenediamine as a raw material through a homogeneous precipitation method; and then calcining the precursor in a hydrogen argon mixed reduction atmosphere to prepare the zinc oxide / nickel composite micron rod material. The material has the advantages of high initial coulomb efficiency, high reversible capacity, good cycle stability and the like when the material is usedas a lithium ion battery cathode material.

Description

technical field [0001] The invention relates to a lithium ion battery electrode material, in particular to a zinc oxide / nickel composite micro-rod electrode material and a preparation method thereof. Background technique [0002] Due to the advantages of high cell voltage, high energy and power density, and long cycle life, lithium-ion batteries have occupied a dominant position in the secondary battery market and become the most important electrical energy storage device. The improvement of lithium-ion battery performance mainly depends on the development of electrode material technology. In the existing commercial lithium-ion batteries, the negative electrode materials are mainly traditional graphite materials, and its low theoretical capacity (372 mAh / g) severely limits the further improvement of the energy density of lithium-ion batteries. [0003] As a new type of lithium-ion battery negative electrode replacement material, zinc oxide has a theoretical capacity of abou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/38H01M4/48H01M10/0525Y02E60/10
Inventor 黄小华吴建波钟文武申士杰林燕曹一琦
Owner TAIZHOU UNIV
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