Preparation method of ZnFe2O4 nanocube for a lithium ion battery negative electrode material

A nano-cube, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unstable structure, complex preparation process, short cycle life, etc., and achieve stable structure, simple preparation process and long cycle. effect of life

Active Publication Date: 2020-03-27
HUAIBEI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the invention is to solve existing ZnFe 2 o 4 The structure of the negative electrode material is not stable enough during the cycle, and the gradual pulverization leads to a short cycle life; and the technical defects of the complex and time-consuming preparation process, high cost, and poor repeatability provide a high-current charge-discharge capacity and long cycle life. ZnFe 2 o 4 A simple preparation method of nanocubes can meet the needs of negative electrode materials for power lithium-ion batteries

Method used

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  • Preparation method of ZnFe2O4 nanocube for a lithium ion battery negative electrode material
  • Preparation method of ZnFe2O4 nanocube for a lithium ion battery negative electrode material
  • Preparation method of ZnFe2O4 nanocube for a lithium ion battery negative electrode material

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Embodiment 1

[0029] As a specific embodiment, 2 mmol of zinc nitrate hexahydrate and 4 mmol of ferrous sulfate heptahydrate were added to a mixed solution of 33 mL of water and 2 mL of ethanolamine, and stirred to form a uniform suspension. Then the suspension was transferred to a reaction kettle with a polytetrafluoroethylene liner, and reacted at a constant temperature of 170° C. for 10 h. After the reaction was complete, the precipitate was collected by filtration, washed three times with deionized water and absolute ethanol, and vacuum-dried at 80° C. to obtain a brown-yellow solid powder product.

[0030] The lithium-ion battery negative electrode material prepared by the present invention is assembled into a button battery, and the test method is as follows: ZnFe 2 o 4 Mix the powder, SuperP conductive carbon, and polyvinylidene fluoride binder at a mass ratio of 70:20:10, add an appropriate amount of N-methylpyrrolidone solvent and stir evenly, apply it on a copper foil, and dry it...

Embodiment 2

[0038] Add 2mmol of zinc nitrate hexahydrate and 4mmol of ferrous sulfate heptahydrate into a mixed solution of 34.5mL of water and 0.5mL of ethanolamine, and stir to form a uniform suspension. Then the suspension was transferred to a reaction kettle with a polytetrafluoroethylene liner, and reacted at a constant temperature of 170° C. for 10 h. After the reaction was complete, the precipitate was collected by filtration, washed three times with deionized water and absolute ethanol, and vacuum-dried at 80° C. to obtain a brown-yellow solid powder product.

Embodiment 3

[0040] Add 2mmol of zinc nitrate hexahydrate and 4mmol of ferrous sulfate heptahydrate into a mixed solution of 34mL of water and 1mL of ethanolamine, and stir to form a uniform suspension. Then the suspension was transferred to a reaction kettle with a polytetrafluoroethylene liner, and reacted at a constant temperature of 180°C for 8 hours. After the reaction was complete, the precipitate was collected by filtration, washed three times with deionized water and absolute ethanol, and vacuum-dried at 80° C. to obtain a brown-yellow solid powder product.

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Abstract

The invention discloses a preparation method of a ZnFe2O4 nanocube for a lithium ion battery negative electrode material, which adopts water and ethanolamine as a solvent system, adopts zinc nitrate hexahydrate and ferrous sulfate heptahydrate as raw materials, and adopts a solvothermal method to prepare the ZnFe2O4 nanocube through one-step reaction. The nanocubes with narrow particle size distribution and uniform morphology can be prepared by ingeniously using water and ethanolamine as reaction solvents, the material is stable in structure, and the particle size is 200-350 nm; an electrochemical test shows that the ZnFe2O4 nanocube has excellent high-current charge-discharge performance and cycle life, and the reversible capacity reaches up to 717mAh / g after 1500 cycles at the high current density of 1A / g and is far higher than the theoretical specific capacity (372mAh / g) of a commercial graphite negative electrode material; the preparation method is simple in reaction system, a surfactant is not needed, subsequent heat treatment is not needed, and the product can be obtained through one-step reaction. The reaction solvent is low in cost and environment-friendly; and the productis controllable in morphology, good in repeatability and easy for industrial production.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material of a lithium ion battery, in particular to a ZnFe material used for a negative electrode material of a lithium ion battery 2 o 4 Preparation method of nanocubes. Background technique [0002] Lithium-ion batteries have been widely used as power sources for small electronic products due to their high operating voltage, fast charging and discharging speed, no memory effect, and environmental friendliness. In recent years, with the rapid development of electric vehicles, power lithium-ion batteries with high power and high energy density are urgently needed. At present, the theoretical specific capacity of commercialized graphite-based carbon anode materials is only 372mAh / g, and "lithium dendrites" are easily formed during rapid charge and discharge, causing battery short circuits and causing safety problems. In recent years, composite metal oxides have higher The theoretic...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/48H01M10/0525
CPCH01M4/48H01M4/525H01M10/0525Y02E60/10
Inventor 王飞任小高汪燕鸣代汉文徐晓宁
Owner HUAIBEI NORMAL UNIVERSITY
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