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Preparation method for nano-Fe2O3/SFC lithium ion battery composite anode material

A nanometer ferric oxide and lithium-ion battery technology, applied in battery electrodes, secondary batteries, nanotechnology, etc., can solve the problems of volume expansion, capacity decay, poor cycle stability, and material pulverization, etc., and achieve high specific capacity, Excellent electrochemical performance and the effect of saving production cost

Inactive Publication Date: 2014-11-19
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Fe 2 o 3 It has a high theoretical specific capacity (1005mAh / g), but it cannot be used alone as an anode material for lithium-ion batteries. The main factor restricting its application is that its capacity decays too fast, that is, its cycle stability is too poor, and volume will occur during charging and discharging. powdering of the material due to swelling

Method used

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  • Preparation method for nano-Fe2O3/SFC lithium ion battery composite anode material
  • Preparation method for nano-Fe2O3/SFC lithium ion battery composite anode material
  • Preparation method for nano-Fe2O3/SFC lithium ion battery composite anode material

Examples

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Embodiment 1

[0016] (1) Carbonize sisal fiber for 1 hour under a nitrogen atmosphere with a gas flow rate of 40ml / min to obtain sisal fiber charcoal. The carbonization temperature is 900°C, the heating rate is 3°C / min, and then ground into 300-mesh sisal charcoal powder .

[0017] (2) Add 0.875g of ferric chloride to 100ml of deionized water, and then add 0.75g of sisal charcoal powder after it is completely dissolved, then add 0.3g of urea while stirring, and conduct a hydrothermal reaction in a closed reactor for 14 hours. 120°C, after the reaction is completed, wash with deionized water until neutral, and dry the product at 80°C to obtain nano-Fe2O3 / sisal charcoal (Nano-Fe 2 o 3 / SFC) Lithium-ion battery composite anode material, in which Fe 2 o 3 The average particle size is 20nm.

[0018] Electrode preparation: Mix 0.4g of the composite negative electrode material obtained in step (2), 0.05g of acetylene black, and 0.05g of PVDF (polyvinylidene fluoride), add the solvent NMP (N-me...

Embodiment 2

[0022] (1) Carbonize sisal fiber for 1 hour under a nitrogen atmosphere with a gas flow rate of 40ml / min to obtain sisal fiber charcoal. The carbonization temperature is 900°C, the heating rate is 3°C / min, and then ground into 300-mesh sisal charcoal powder .

[0023] (2) Add 1.75g ​​of ferric chloride to 100ml of deionized water, and then add 0.5g of sisal charcoal powder after it is completely dissolved, then add 0.6g of urea while stirring, hydrothermally react in a closed reactor for 14 hours, and the reaction temperature is 120 °C, after the reaction is completed, wash with deionized water until neutral, and dry the product at 80 °C to obtain nanometer ferric oxide / sisal charcoal (Nano-Fe 2 o 3 / SFC) Lithium-ion battery composite anode material, in which Fe 2 o 3 The average particle size is 250nm.

[0024] The preparation of the electrode, the assembly of the battery and the electrochemical test are all the same as in Example 1.

Embodiment 3

[0026] (1) Carbonize sisal fiber for 1 hour under a nitrogen atmosphere with a gas flow rate of 40ml / min to obtain sisal fiber charcoal. The carbonization temperature is 900°C, the heating rate is 3°C / min, and then ground into 300-mesh sisal charcoal powder .

[0027] (2) Add 2.625g of ferric chloride to 100ml of deionized water, and then add 0.25g of sisal charcoal powder after it is completely dissolved, then add 0.9g of urea while stirring, and conduct a hydrothermal reaction in a closed reactor for 14 hours. 120°C, after the reaction is completed, wash with deionized water until neutral, and dry the product at 80°C to obtain nano-Fe2O3 / sisal charcoal (Nano-Fe 2 o 3 / SFC) Lithium-ion battery composite anode material, in which Fe 2 o 3 The average particle size is 300nm.

[0028] The preparation of the electrode, the assembly of the battery and the electrochemical test are all the same as in Example 1.

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Abstract

The invention discloses a preparation method for a nano-Fe2O3 / SFC lithium ion battery composite anode material. The preparation method for the nano-Fe2O3 / SFC lithium ion battery composite anode material comprises the following steps: (1) sisal fibers are carbonized for 0.5-3 hours under a nitrogen atmosphere with gas flow of 20-100 ml / min, so as to obtain sisal fiber carbon; the carbonizing temperature is 600-1000 DEC G; The temperature increment rate is 1-10 DEC / min; 100-300 mesh sisal carbon powders are grinded; (2) 0.875-3.5 g ferric chloride is added to 100ml water; after the ferric chloride is fully dissolved, 0.25-0.75g sisal carbon powders are added; 0.3-0.9g carbamide is added while stirring to solution; a hydrothermal reaction is conducted for 12-24 hours in an airtight reaction kettle; the reaction temperature is 120-180 DEC G; when the reaction is completed, water is adopted, so as to wash the solution to the neutral state; after drying, the nano-Fe2O3 / SFC ion battery composite anode material is obtained; the average particle diameter of the Fe2O3 is 10-500 nm. According to the preparation method provided by the invention, sisal fibers are adopted to serve as raw materials; the cost is low; the preparation method is green and environment friendly; testing results further indicate that the nano-Fe2O3 / SFC lithium ion battery composite anode material has excellent electrochemical performances.

Description

technical field [0001] The present invention relates to a kind of nano ferric oxide / sisal charcoal (Nano-Fe 2 o 3 / SFC) preparation method of lithium-ion battery composite negative electrode material. Background technique [0002] In today's society, with the decrease of non-renewable resources, the development and utilization of new energy has become an important way to achieve sustainable development. Lithium-ion batteries are favored for their high energy density, high power density, and good safety, and their application fields continue to expand. They are not only used in small electronic devices, but also in the direction of power batteries in recent years. In the manufacturing cost of lithium-ion batteries, electrode materials account for the highest proportion, reaching 50-60%, and the electrode materials inside the battery control the electrochemical reactions of the entire battery. Therefore, electrode materials, as the core of lithium-ion batteries, have always...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/583B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/52H01M4/583H01M10/0525Y02E60/10
Inventor 覃爱苗余心亮田宁杜锐韦春
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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