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Method for improving electrochemical performance of zinc ferrite by doping nickel element and application

A technology of zinc ferrite and nickel elements, which is applied in the preparation process of advanced composite materials and the field of negative electrode composite materials for lithium-ion batteries, can solve the problems of large volume change, short cycle life, and low cycle stability, and achieve a simple synthesis method, Low self-discharge rate and good cycle stability

Active Publication Date: 2016-09-21
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among these transition metal oxides, due to ZnFe 2 o 4 Inexpensive, non-toxic, environmentally friendly, especially with a high specific capacity of 1000.5 mAh per gram, however ZnFe 2 o 4 Short cycle life, low cycle stability, and large volume changes during charge and discharge, these shortcomings limit its practical application

Method used

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  • Method for improving electrochemical performance of zinc ferrite by doping nickel element and application
  • Method for improving electrochemical performance of zinc ferrite by doping nickel element and application
  • Method for improving electrochemical performance of zinc ferrite by doping nickel element and application

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Embodiment 1

[0026] A method for improving the electrochemical performance of zinc ferrite by doping nickel elements, wherein a certain molar mass of nickel replaces a certain molar mass of zinc to form a ternary metal oxide, and the specific preparation steps are as follows:

[0027] (1) Dissolve 0.15 mmol of nickel nitrate hexahydrate, 0.85 mmol of zinc nitrate hexahydrate, 1.5 mmol of ferrous sulfate heptahydrate, 2.5 mmol of urea and 1.7 mmol of ammonium fluoride in 25 milliliters of deionized water to form a uniform The mixed solution is then transferred to a stainless steel reaction kettle, and subjected to hydrothermal reaction for 20 hours at 180 degrees Celsius;

[0028] (2) cooling and centrifuging the turbid solution prepared in step (1), and cleaning three times with deionized water and alcohol;

[0029] (3) After drying the sample prepared in step (2) in an oven for 24 hours, the powder sample is fully ground in a mortar, mixed evenly, placed in a porcelain boat, and placed in...

Embodiment 2

[0031] A method for improving the electrochemical performance of zinc ferrite by doping nickel elements, wherein a certain molar mass of nickel replaces a certain molar mass of zinc to form a ternary metal oxide, and the specific preparation steps are as follows:

[0032] (1) Dissolve 0.25 mmol of nickel nitrate hexahydrate, 0.75 mmol of zinc nitrate hexahydrate, 2 mmol of ferrous sulfate heptahydrate, 5 mmol of urea and 2 mmol of ammonium fluoride in 35 milliliters of deionized water to form a uniform The mixed solution is then transferred to a stainless steel reactor, and subjected to hydrothermal reaction at 200 degrees Celsius for 24 hours;

[0033] (2) cooling and centrifuging the turbid solution prepared in step (1), and cleaning three times with deionized water and alcohol;

[0034] (3) After drying the sample prepared in step (2) in an oven for 24 hours, the powder sample is fully ground in a mortar, mixed evenly, placed in a porcelain boat, and placed in a tube furnac...

Embodiment 3

[0036] A method for improving the electrochemical performance of zinc ferrite by doping nickel elements, wherein a certain molar mass of nickel replaces a certain molar mass of zinc to form a ternary metal oxide, and the specific preparation steps are as follows:

[0037] (1) Dissolve 0.35 mmol of nickel nitrate hexahydrate, 0.65 mmol of zinc nitrate hexahydrate, 1.8 mmol of ferrous sulfate heptahydrate, 3 mmol of urea and 2.5 mmol of ammonium fluoride in 45 milliliters of deionized water to form a uniform The mixed solution is then transferred to a stainless steel reactor, and subjected to hydrothermal reaction for 28 hours at 220 degrees Celsius;

[0038] (2) cooling and centrifuging the turbid solution prepared in step (1), and cleaning three times with deionized water and alcohol;

[0039] (3) After drying the sample prepared in step (2) in an oven for 24 hours, the powder sample is fully ground in a mortar, mixed evenly, placed in a porcelain boat, and placed in a tube fu...

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Abstract

The invention discloses a method for improving charge-discharge cycling capacity of zinc ferrite by doping nickel element and application, and relates to the field of lithium ion battery anode composite material preparation. The method comprises the following steps: forming a ternary metallic oxide by doping the nickel element in zinc ferrite, selecting and using, and mixing and stirring nickel nitrate hexahydrate, zinc nitrate hexahydrate, ferrous sulfate septihydrate, urea and ammonium fluoride according to a certain molar mass ratio to form a uniform mixed solution; and carrying out hydro-thermal synthesis and calcinations to obtain NixZn1-xFe2O4(x being greater than 0 and smaller than 1) metallic oxide. According to the method, the NixZn1-xFe2O4(x being greater than 0 and smaller than 1) metallic oxide with excellent electrochemical performance can be prepared; and moreover, the synthetic method is relatively simple, low in energy consumption, good in controllability, high in yield and low in cost, and is applicable for large-scale production. The invention also discloses application of the NixZn1-xFe2O4(x being greater than 0 and smaller than 1) metallic oxide, the NixZn1-xFe2O4(x being greater than 0 and smaller than 1) metallic oxide is used for lithium ion battery anode materials, and the metallic oxide has the characteristics of high charging and discharging specific capacity and high cycling stability.

Description

technical field [0001] The invention relates to the field of preparation of lithium-ion battery negative electrode composite materials, in particular to a method and application for improving the electrochemical performance of zinc ferrite by doping nickel elements, and belongs to the technical field of advanced composite material preparation technology. Background technique [0002] In recent years, with the increasing shortage of traditional fossil energy and the continuous deterioration of the ecological environment, the development of new green energy has attracted more and more attention from all over the world. As a kind of new energy, chemical power source has the advantages of mobility and high energy density, and has attracted more attention. Lithium-ion secondary battery is a new type of chemical power source. Because of its superior electrochemical performance and environmental protection advantages, it has become the first choice for secondary batteries today, an...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/364H01M4/38H01M4/52H01M4/626H01M10/0525Y02E60/10
Inventor 金波李林林郎兴友杨春成朱永福高旺文子李建忱赵明蒋青
Owner JILIN UNIV
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