ZnFe2O4/C composite cathode material with hollow sphere structure and one-step preparation method thereof

A negative electrode material, znfe2o4 technology, which is applied in the field of hollow spherical structure iron-based composite oxide negative electrode material ZnFe2O4/C and its preparation, can solve the problems of few related reports and the like, and achieves simple process, uniform morphology and high crystallinity. Effect

Inactive Publication Date: 2011-10-05
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Based on the above facts and the current ZnFe with application prospects 2 o 4 There are not many reports about materials used as lithium-ion anode materials, and there is no ZnFe 2 o 4 /C composite material is used as a rep

Method used

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  • ZnFe2O4/C composite cathode material with hollow sphere structure and one-step preparation method thereof
  • ZnFe2O4/C composite cathode material with hollow sphere structure and one-step preparation method thereof
  • ZnFe2O4/C composite cathode material with hollow sphere structure and one-step preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 0.34 g of zinc chloride and 1.35 g of ferric chloride hexahydrate respectively, dissolve them in 30 mL of ethylene glycol solution, then add 1 to 2 mL of polyethylene glycol 600 dropwise, at 30 o 2.73 g of urea and 1.0 g of glucose were slowly added under magnetic stirring at room temperature, and the stirring was continued for 1 hour at this temperature. The mixed solution was transferred to a 50 mL polytetrafluoroethylene-lined reactor and reacted at 200°C for 48 hours. After the reactor was cooled to room temperature, the supernatant was recovered for the next use. The obtained precipitate was separated by filtration, washed three times with deionized water and absolute ethanol, and dried in vacuum at 80°C for 12 hours to obtain a black product. The obtained product was subjected to EDS, thermogravimetric analysis, elemental analysis and XRD analysis respectively, indicating that the product was a hollow spherical structure ZnFe 2 o 4 / C, carbon content 2.30 ...

Embodiment 2

[0036] Weigh 0.34 g of zinc chloride and 1.35 g of ferric chloride hexahydrate respectively, dissolve them in 30 mL of ethylene glycol solution, then add 1 to 2 mL of polyethylene glycol 600 dropwise, and heat in a water bath at 40°C with magnetic stirring Slowly add 2.73 g of urea and 1.1 g of glucose, and keep stirring for 1 hour at this temperature. The mixed solution was transferred to a 50 mL polytetrafluoroethylene-lined reactor and reacted at 200 °C for 24 hours. After the reaction kettle was cooled to room temperature, the supernatant was recovered for the next use. The resulting precipitate was separated by filtration, washed three times with deionized water and absolute ethanol, and vacuum-dried at 80 °C for 12 hours to obtain a black product. The obtained product was subjected to EDS, thermogravimetric analysis, elemental analysis and XRD analysis respectively, indicating that the product was a hollow spherical structure ZnFe 2 o 4 / C, carbon content 2.38 wt%.

...

Embodiment 3

[0039] Weigh 0.68 g of zinc chloride and 2.70 g of ferric chloride hexahydrate respectively, dissolve them in 30 mL of ethylene glycol solution, then add 1-2 mL of polyethylene glycol 600 dropwise, and heat in a water bath at 40°C with magnetic stirring Slowly add 6.67 grams of urea and 1.2 grams of sucrose, maintain this temperature and continue stirring for 1 hour. The mixed solution was transferred to a 50 mL polytetrafluoroethylene-lined reactor and reacted at 200°C for 48 hours. After the reaction kettle was cooled to room temperature, the supernatant was recovered for the next use. The resulting precipitate was separated by filtration, washed three times with deionized water and absolute ethanol, and vacuum-dried at 80°C for 12 hours to obtain a black product. The obtained product was subjected to EDS, thermogravimetric analysis, elemental analysis and XRD analysis respectively, indicating that the product was a hollow spherical structure ZnFe 2 o 4 / C, carbon content ...

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Abstract

The invention relates to a technology on a cathode material for a lithium ion secondary battery, and in particular relates to an iron-based composite oxide cathode material ZnFe2O4/C with a hollow sphere structure and a preparation method thereof. The iron-based composite oxide cathode material is characterized in that the general formula is ZnFe2O4/C, wherein the content of carbon element is 1-10%; and a solvothermal one-step method is utilized to prepare the ZnFe2O4/C composite cathode material with the hollow sphere structure and narrower particle size distribution. The ZnFe2O4/C composite cathode material is high in purity; and the mean particle size of the ZnFe2O4/C composite cathode material is 500 nanometers and the wall thickness is 150 nanometers. An electrochemical test proves that the charging specific capacity of the ZnFe2O4/C composite cathode material at the first cycle can be 911mAh/g and the charging specific capacity of the ZnFe2O4/C composite cathode material can be 826mAh/g after being circulated for 30 times as well as the retention rate of the capacity can be 91%. In addition, the ZnFe2O4/C composite cathode material can keep good charge-discharge reversibility under different charge-discharge current densities. The charge-discharge capacity of the ZnFe2O4/C composite cathode material is superior to that of an existing commonly-used carbon cathode material (theoretical specific capacity is 372mAh/g). The ZnFe2O4/C composite cathode material is low in price of raw materials, simple in process and easy to industrialize, and has wider application prospects as well as meets practical production.

Description

technical field [0001] The invention relates to the negative electrode material technology for lithium-ion secondary batteries, in particular to the hollow spherical structure iron-based composite oxide negative electrode material ZnFe 2 o 4 / C and its preparation method. Background technique [0002] Due to the advantages of high potential, large specific energy, long cycle life, stable discharge performance, good safety, wide operating temperature range and green environmental protection, lithium-ion batteries are widely used in portable electronic devices, power tools, space technology and defense industry and other fields. The widely used negative electrode material is graphitized carbon material, which has excellent performance in multiple charge and discharge cycles, but its lithium storage capacity is lower than the theoretical specific capacity of graphite of 372mAh / g, which is difficult to meet the needs of the new generation of large lithium batteries used in the...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/1391H01M4/62
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 施志聪邓远富陈国华张秋美张雷霆
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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