Carbon-coated hollow ferriferrous oxide and application thereof

A technology of ferroferric oxide and carbon coating, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of unsuitability for industrial production, long synthesis cycle, and high production cost, so as to buffer internal stress, improve electrical conductivity, Effect of High Capacity Retention

Active Publication Date: 2013-04-10
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the reported literature of carbon-coated ferric oxide, such as Zhao et al. (Zhao, X. Y. Xia, D. G. Zheng, K. Fe 3 o 4 / Fe / Carbon Composite and Its Application as Anode Material for Lithium-Ion Batteries. Acs Applied Materials & Interfaces.2012) discloses a method for preparing a carbon / ferric oxide composite material, which requires a large amount of organic matter as raw materials, The synthesis period is long, the synthesis temperature is high, and the production cost is high, so it is not suitable for industrial production

Method used

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  • Carbon-coated hollow ferriferrous oxide and application thereof
  • Carbon-coated hollow ferriferrous oxide and application thereof
  • Carbon-coated hollow ferriferrous oxide and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] First, dissolve 0.4 g of ferric chloride in a mixed solvent of 18 ml of water and 22 ml of ethanol. After stirring and dissolving, put it into a closed hydrothermal kettle and place it in an oven at 180° C. for 20 hours to keep it warm. After the reaction, the iron oxide precipitate in the hydrothermal kettle was filtered, washed and dried. 0.5 g of glucose was added to the iron oxide powder and mixed evenly, and then placed in a muffle furnace at 300° C. for 3 hours to obtain the final product. It is a carbon-coated ferric oxide with uniform particles (see figure 1 ).

[0027] Weigh carbon-coated hollow iron ferric oxide: acetylene black: polyvinylidene fluoride at a mass ratio of 70:20:10, grind them evenly, and coat them on copper foil to make electrodes. Metal lithium sheets are used as positive electrodes. The electrolyte is 1 mol / L LiPF 6 / EC-DMC (volume ratio 1:1), polypropylene microporous film as a separator (Celgard 2300), assembled into a button battery (...

Embodiment 2

[0029] First, dissolve 0.5 g of ferric chloride in a mixed solvent of 20 ml of water and 20 ml of ethanol. After stirring and dissolving, put it into a closed hydrothermal kettle and place it in an oven at 170°C for 24 hours to keep it warm. After the reaction, the iron oxide precipitate in the hydrothermal kettle was filtered, washed and dried. 0.6 g of glucose was added to the iron oxide powder and mixed evenly, and then placed in a muffle furnace at 350° C. for 4 hours to obtain the final product. Product appearance is similar to figure 1 .

[0030] The obtained carbon-coated hollow Fe3O4 material was used to prepare electrodes according to the method in Example 1, and assembled into a simulated battery. At a current density of 0.1 A / g, its reversible capacity reached 830 mAh / g.

Embodiment 3

[0032] First, dissolve 0.4 g of ferric chloride in a mixed solvent of 16 ml of water and 24 ml of ethanol. After stirring and dissolving, put it into a closed hydrothermal kettle and place it in an oven at 190°C for 26 hours. After the reaction, the iron oxide precipitate in the hydrothermal kettle was filtered, washed and dried. 0.8 g of glucose was added to the iron oxide powder and mixed uniformly, and then placed in a muffle furnace at 350° C. for 2 hours to obtain the final product. Product appearance is similar to figure 1 .

[0033] The obtained carbon-coated hollow Fe3O4 material was used to prepare electrodes according to the method in Example 1, and assembled into a simulated battery. At a current density of 0.1 A / g, its reversible capacity reached 810 mAh / g.

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Abstract

The invention discloses carbon-coated hollow ferriferrous oxide and an application thereof. The preparation method of the carbon-coated hollow ferriferrous oxide comprises the following steps of: (1) adding a ferric salt into a solvent and dissolving the ferric salt, wherein the solvent is a mixture of water and ethanol; implementing a hydrothermal reaction in a sealed hydrothermal kettle for 20-30hours at 100-250 DEG C, and separating to obtain a ferric oxide deposit; and (2) uniformly mixing the ferric oxide deposit with a reducing carbon source, wherein the reducing carbon source is one substance or a combination of multiple substances selected from carbon powder, glucose, polyethylene, acetylene black and starch; and implementing an insulating reaction for 0.5-4hours in a muffle at 200-1000 DEG C, to obtain the carbon-coated hollow ferriferrous oxide. The carbon-coated hollow ferriferrous oxide, used as a lithium ion battery negative electrode material, can remarkably improve electrical conductivity and keeps a stable structure, so that a comparatively high capacity retention ratio is still guaranteed after several charge-discharge cycles.

Description

(1) Technical field [0001] The invention relates to a carbon-coated hollow triiron tetroxide and its application as a lithium-ion battery negative electrode material. (2) Background technology [0002] One of the key technologies for the development of high-performance lithium batteries is the research and development of negative electrode materials. So far, as an emerging lithium-ion battery anode material, Fe3O4 has the characteristics of non-toxicity, abundant resources, low price and high energy density. Lithium-ion batteries based on ferroferric oxide have great social and economic benefits and great energy strategic significance. At present, the main problems of iron oxide as a negative electrode material are poor electrical conductivity, severe performance attenuation due to structural collapse caused by stress concentration during cycling, and unsatisfactory electrochemical stability. The carbon-coated hollow structure Fe3O4 can greatly improve the electrical condu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52
CPCY02E60/10
Inventor 肖涵张文魁陶新永黄辉甘永平
Owner ZHEJIANG UNIV OF TECH
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