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Ni/NiFe2O4 lithium ion battery anode material synthesized by bimetallic MOF precursor and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle performance and low conductivity, and achieve the effects of low cost, low equipment requirements, and simple synthesis process

Inactive Publication Date: 2019-04-05
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a simple, low-cost and excellent electrochemical performance bimetallic MOF precursor for synthesizing Ni / NiFe 2 o 4 Lithium ion battery negative electrode material and preparation method thereof, in order to solve NiFe 2 o 4 Problems such as low conductivity and poor cycle performance caused by significant volume change

Method used

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  • Ni/NiFe2O4 lithium ion battery anode material synthesized by bimetallic MOF precursor and preparation method thereof
  • Ni/NiFe2O4 lithium ion battery anode material synthesized by bimetallic MOF precursor and preparation method thereof
  • Ni/NiFe2O4 lithium ion battery anode material synthesized by bimetallic MOF precursor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Dissolve 0.727g of nickel nitrate hexahydrate and 1.352g of ferric chloride hexahydrate in 50mL of DMF respectively, and stir magnetically for 1h to form a uniform and stable solution; then add 0.453g of aminoterephthalic acid and 6mL of Sodium hydroxide solution, wherein the concentration of sodium hydroxide is 0.4moL / L.

[0027] (2) Then transfer the solution to a high-pressure reactor with a polytetrafluoroethylene liner, and place the reactor at 120° C. for 24 hours. After the reaction was completed, cool to room temperature, centrifuge, wash (three times with DMF), and dry at 80°C for 12 hours to obtain a brown Ni-Fe-MOFs precursor.

[0028] (3) Place the obtained brown Ni-Fe-MOFs precursor in a muffle furnace, raise the temperature to 500°C at 5°C / min, keep it warm for 2h, and then cool to room temperature to finally obtain Ni / NiFe 2 o 4 composite material.

Embodiment 2

[0030] (1) Dissolve 1.454g of nickel nitrate hexahydrate and 2.704g of ferric chloride hexahydrate in 50mL of DMF respectively, and magnetically stir for 1h to form a uniform and stable solution; then add 0.906g of aminoterephthalic acid and 12mL of Sodium hydroxide solution, wherein the concentration of sodium hydroxide is 0.4moL / L.

[0031](2) Then transfer the solution to a high-pressure reactor with a polytetrafluoroethylene liner, and place the reactor at 120° C. for 24 hours. After the reaction was completed, cool to room temperature, centrifuge, wash (three times with DMF), and dry at 80°C for 12 hours to obtain a brown Ni-Fe-MOFs precursor.

[0032] (3) Place the obtained brown Ni-Fe-MOFs precursor in a muffle furnace, raise the temperature to 500°C at 5°C / min, keep it warm for 2h, and then cool to room temperature to finally obtain Ni / NiFe 2 o 4 composite material.

Embodiment 3

[0034] (1) Dissolve 0.727g of nickel nitrate hexahydrate and 1.352g of ferric chloride hexahydrate in 50mL of DMF respectively, and stir magnetically for 1h to form a uniform and stable solution; then add 0.453g of aminoterephthalic acid and 6mL of Sodium hydroxide solution, wherein the concentration of sodium hydroxide is 0.4moL / L.

[0035] (2) Then transfer the solution to a high-pressure reactor with a polytetrafluoroethylene liner, and place the reactor at 120° C. for 24 hours. After the reaction was completed, cool to room temperature, centrifuge, wash (three times with DMF), and dry at 80°C for 12 hours to obtain a brown Ni-Fe-MOFs precursor.

[0036] (3) Place the obtained brown Ni-Fe-MOFs precursor in a muffle furnace, raise the temperature to 500°C at 5°C / min, keep it warm for 4h, and then cool to room temperature to finally obtain Ni / NiFe 2 o 4 composite material.

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Abstract

The invention discloses a Ni / NiFe2O4 lithium ion battery anode material synthesized by a bimetallic MOF precursor and a preparation method thereof. The Ni / NiFe2O4 electrode material is composed of elementary substance Ni and NiFe2O4. The preparation method is characterized by constructing a Ni-Fe-MOFs precursor by using soluble nickel salt and iron salt as main raw materials, by using amino terephthalic acid as a ligand, and by using a solvothermal method; and further drying and calcinating the Ni-Fe-MOFs precursor to obtain the Ni / NiFe2O4 electrode material. The Ni / NiFe2O4 synthesized by themethod of the invention has a uniform shape and size of about 200-400 nm, has dispersed Ni and NiFe2O4, a high specific surface area, a high porosity, and a good electron conductivity, can provide a good transmission channel for lithium ions, and thus exhibits excellent structural stability, cycle performance and rate performance as the lithium ion battery anode material. The method of the invention is simple in process, low in equipment requirements and low in cost. The obtained Ni / NiFe2O4 lithium ion battery anode material has a good application prospect.

Description

technical field [0001] The invention discloses the synthesis of Ni / NiFe from a bimetallic MOF precursor 2 o 4 The invention relates to a lithium ion battery negative electrode material and a preparation method thereof, belonging to the field of lithium ion battery electrode materials. Background technique [0002] Transition metal oxides are an important class of functional materials, which have broad application prospects in many fields such as catalysis, semiconductors and batteries. With the rapid development of science and technology, metal oxides have been fully and deeply understood. Lithium-ion batteries are one of the representatives of new green energy storage devices, and transition metal oxides are considered to be extremely potential negative electrode materials. NiFe 2 o 4 It has the characteristics of high specific capacity, good safety and environmental friendliness. However, like most metal oxides, NiFe 2 o 4 There are two problems in practical applic...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/525H01M10/0525
CPCH01M4/362H01M4/38H01M4/525H01M10/0525Y02E60/10
Inventor 李峻峰包珊珊刘磊杨亚楠王皓马悦李平赖雪飞
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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