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Preparation method for cathode material of nano ferroferric oxide/sisal hemp carbon lithium ion battery

A technology of ferric oxide and lithium-ion batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as short service life, high cost, and poor safety, and achieve high specific capacity, abundant sources, and good circulation The effect of stability

Active Publication Date: 2014-10-01
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the current technical level is becoming more and more mature, and large-scale industrialization has begun to take shape, lithium-ion batteries still have many shortcomings, such as high cost, poor safety, and short service life. The most critical factor is the lithium-ion battery. electrode material

Method used

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  • Preparation method for cathode material of nano ferroferric oxide/sisal hemp carbon lithium ion battery
  • Preparation method for cathode material of nano ferroferric oxide/sisal hemp carbon lithium ion battery
  • Preparation method for cathode material of nano ferroferric oxide/sisal hemp carbon lithium ion battery

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Embodiment

[0021] (1) The sisal fiber was cleaned and dried and placed in a vacuum tube resistance furnace, carbonized for 1 hour in a nitrogen atmosphere with a gas flow rate of 40ml / min, the carbonization temperature was 900°C, and the heating rate was 3°C / min. The sisal charcoal was obtained after natural cooling; then the sisal charcoal was ball milled at a speed of 35 r / s for 5 hours to obtain sisal charcoal powder with an average particle size of 300 mesh.

[0022] (2) Add 1g of ferrous chloride and 1g of sisal charcoal powder obtained in step (1) into 100ml of water, then add 1g of urea while stirring, stir and react in a constant temperature oil bath at 95°C for 50 minutes, filter, and use Wash with ionic water until pH = 7, then wash again with absolute ethanol, place in the air for 12 hours, and finally vacuum dry at 80°C for 24 hours to obtain a negative electrode material precursor.

[0023] (3) Put the negative electrode material precursor obtained in step (2) into a vacuum ...

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Abstract

The invention discloses a preparation method for a cathode material of a nano ferroferric oxide / sisal hemp carbon lithium ion battery. The preparation method comprises the following steps: (1) carbonizing washed and dried sisal hemp fibers under an inert atmosphere, and crushing to obtain sisal hemp carbon powder; (2) dissolving an iron source into water and adding the sisal hemp carbon powder; adding a precipitant and carrying out oil-bath reaction for a period of time; washing and filtering to obtain a cathode material precursor; and (3) calcining the cathode material precursor under the inert atmosphere to obtain black solid powder, namely the cathode material of the nano ferroferric oxide / sisal hemp carbon lithium ion battery. An electrochemical test shows that the cathode material of the nano ferroferric oxide / sisal hemp carbon lithium ion battery prepared by the invention has high capacity and good circulation stability; the specific capacity can be 414mAh / g when the battery is charged for the first time and is obviously better than a theoretical specific capacity (372mAh / g) of a graphite cathode material. After the battery is circularly charged for 30 times, the specific capacity can still be maintained to 401mAh / g and is 96.9% of the initial charging specific capacity, so that the circulating stability is good.

Description

technical field [0001] The present invention relates to a kind of nano ferric oxide / sisal charcoal (Nano-Fe 3 o 4 / SFC) preparation method of lithium ion battery negative electrode material. Background technique [0002] The emergence of lithium-ion batteries has not only completely changed the portable electronic market, but also has begun to be used in electric vehicles in recent years, affecting people's daily life more and more profoundly. Although the current technical level is becoming more and more mature, and large-scale industrialization has begun to take shape, lithium-ion batteries still have many shortcomings, such as high cost, poor safety, and short service life. The most critical factor is the lithium-ion battery. electrode material. With the improvement of people's living standards, the demand for lithium-ion batteries is increasing day by day, and the requirements for performance are also higher and higher. Therefore, finding low-cost, high-capacity elect...

Claims

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Application Information

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IPC IPC(8): H01M4/1391
CPCY02E60/122H01M4/362H01M4/52H01M4/583H01M10/0525H01M2004/021Y02E60/10
Inventor 覃爱苗余心亮田宁杜锐韦春
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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