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Modification method of nickel ferrite negative electrode material

A negative electrode material, nickel ferrite technology, applied in the field of modification of nickel ferrite negative electrode material, can solve the problems of poor cycle stability, low conductivity, large volume change, etc., to improve cycle performance, increase conductivity, improve reversibility sexual effect

Inactive Publication Date: 2017-03-22
WUXI MINGSHENG STRONG BLOWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But NiFe 2 o 4 The material itself has defects such as low electrical conductivity and large volume change during charge and discharge cycles, resulting in poor cycle stability and unsatisfactory electrochemical performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for modifying a nickel ferrite negative electrode material, comprising:

[0018] (1) Evenly disperse graphite oxide in deionized water, add nickel nitrate and iron nitrate, and then add CO(NH 2 ) 2 , stir until completely dissolved;

[0019] (2) Transfer the solution in step (1) to an autoclave with a filling degree of 75%, heat to 175° C. for 18 hours, cool and centrifuge;

[0020] (3) Disperse the powder obtained in step (2) in a 10wt% sucrose solution, add a dispersant, and mix uniformly to obtain a slurry;

[0021] (4) Dry the slurry at 100°C, and treat it in a tube furnace at 400°C for 30 minutes in an inert atmosphere to obtain NiFe 2 o 4 / graphene / carbon composite modified materials.

Embodiment 2

[0023] A method for modifying a nickel ferrite negative electrode material, comprising:

[0024] (1) Evenly disperse graphite oxide in deionized water, add nickel nitrate and iron nitrate, and then add CO(NH 2 ) 2 , stir until completely dissolved;

[0025] (2) Transfer the solution in step (1) to an autoclave with a filling degree of 90%, heat to 190° C. for 36 hours, cool and centrifuge;

[0026] (3) Disperse the powder obtained in step (2) in 20wt% sucrose solution, add a dispersant, and mix uniformly to obtain a slurry;

[0027] (4) Dry the slurry at 110°C, and treat it in a tube furnace at 420°C for 90 minutes in an inert atmosphere to obtain NiFe 2 o 4 / graphene / carbon composite modified materials.

Embodiment 3

[0029] A method for modifying a nickel ferrite negative electrode material, comprising:

[0030] (1) Evenly disperse graphite oxide in deionized water, add nickel nitrate and iron nitrate, and then add CO(NH 2 ) 2 , stir until completely dissolved;

[0031] (2) Transfer the solution in step (1) to an autoclave with a filling degree of 80%, heat to 180° C. for 24 hours, cool and centrifuge;

[0032] (3) Disperse the powder obtained in step (2) in a 15wt% sucrose solution, add a dispersant, and mix evenly to obtain a slurry;

[0033] (4) Dry the slurry at 100°C, and treat it in a tube furnace at 410°C for 45min in an inert atmosphere to obtain NiFe 2 o 4 / graphene / carbon composite modified materials.

[0034] The material obtained by the modification method in Example 1-3 has an initial discharge capacity of more than 1237mAh / g, and after 100 cycles, its capacity retention rate is above 96%. It can be seen that the modification method of the present invention increases the...

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PUM

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Abstract

The invention discloses a modification method of a nickel ferrite negative electrode material. The method comprises the steps of firstly synthesizing a NiFe2O4 / graphene composite material, carrying out carbonizing treatment at a high temperature, and evenly coating the surface of the NiFe2O4 / graphene composite material with a carbon layer. According to the material obtained through the modification method, the initial discharge capacity is greater than 1237mAh / g and the capacity retention ratio after 100 cycles is greater than 96%. Therefore, according to the modification method, the conductivity of the material is improved, the reversibility in charge and discharge processes is improved and the cycle performance of the material is improved.

Description

technical field [0001] The invention relates to the technical field of new energy, in particular to a method for modifying a nickel ferrite negative electrode material. Background technique [0002] Today, with the increasing demand for clean energy, lithium-ion batteries are widely used in electric vehicles and large-scale energy storage. At the same time, the electrochemical performance of lithium-ion batteries with high energy density needs to be improved. At present, the research hotspots of lithium-ion batteries focus on the development of negative electrode materials with high specific capacity, good cycle performance, and good safety performance. Among transition metal oxides, NiFe 2 o 4 It is considered to be a very promising anode material for lithium-ion batteries. NiFe 2 o 4 It has a theoretical specific capacity of 915mAh / g, and is rich in resources, low in cost and friendly to the environment. But NiFe 2 o 4 The material itself has defects such as low ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525C01G53/00
CPCC01G53/00H01M4/366H01M4/5825H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 张达明
Owner WUXI MINGSHENG STRONG BLOWER
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