Preparation method of carbon/iron oxide composite and lithium-ion battery

A technology of ferroferric oxide and composite materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low product output, high cost, and low output, and achieve high specific capacity, stable structure, and high conductivity rate effect

Active Publication Date: 2016-11-09
SHANDONG SACRED SUN POWER SOURCES
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Problems solved by technology

Many of the above-mentioned research works mainly focus on how to improve the conductivity of materials, discharge specific capacity or reduce the size of materials, etc., forming a situation where the material synthesis route is relatively complicated, the output is low, and the cost is high; at the same time, the initial discharge capacity of many works is considerable. But follow-up research is insufficient
[0005] In addition, the stability of transition metal oxides can also be improved by constructing micro-nano materials, but most of the current reports require multi-step regulation. Because the constr

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  • Preparation method of carbon/iron oxide composite and lithium-ion battery
  • Preparation method of carbon/iron oxide composite and lithium-ion battery
  • Preparation method of carbon/iron oxide composite and lithium-ion battery

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[0031] The invention provides a method for preparing a carbon / iron tetroxide composite material, comprising: mixing ferrous carbonate with macromolecular organic matter, heating and calcining in a protective atmosphere to obtain the carbon / iron tetroxide composite material.

[0032] The present invention has no special limitation on the sources of all raw materials, which can be commercially available or self-made.

[0033] All the raw materials in the present invention have no special limitation on their purity, and the present invention preferably adopts analytical purity or conventional purity used in the storage battery field.

[0034] Wherein, the ferrous carbonate is preferably micron-sized particles, more preferably prepared according to the following steps: mixing ferrous salt, urea and carbonate in water, and performing hydrothermal reaction to obtain ferrous carbonate.

[0035] The ferrous salt can be a compound containing ferrous ions well known to those skilled in ...

Embodiment 1

[0052] 0.995g FeCl 2 4H 2 O, 0.3g urea (CO(NH 2 ) 2 ) and 0.2g NH 4 HCO 3 Dissolved in 40ml of water, heated to 120°C, and hydrothermally reacted for 12 hours to obtain and collect the precursor ferrous carbonate.

[0053] Mix 0.3460g of precursor ferrous carbonate with 0.1730g of cellulose acetate [mass ratio is 2:1], add 2ml of ethanol, ball mill for 5h, dry the mixture, and heat it to 500°C under the protection of argon, keep 5h, natural cooling, to obtain carbon / ferric oxide composite material.

[0054] The carbon / iron tetroxide composite material obtained in Example 1 is detected by a specific surface analyzer, and its specific surface area is 67.296m 2 / g; the pore size distribution has a larger distribution at 3.8 and 5nm, indicating that the material is a mesoporous material, which is conducive to the storage and rapid transport of electrolytes in the active material.

[0055] Utilize scanning electron microscope to analyze the precursor ferrous carbonate obta...

Embodiment 2

[0059] 1.4g FeSO 4 ·7H 2 O, 0.3g CO(NH 2 ) 2 and 0.2g NH 4 HCO 3 Dissolved in 40ml of water, heated to 120°C, and hydrothermally reacted for 10 hours to obtain and collect the precursor ferrous carbonate. Subsequent experiments were the same as in Example 1.

[0060] The carbon / ferric oxide composite material that obtains in embodiment 2 has been carried out specific surface analysis, the result shows, product has 67.3m 2 The specific surface area per gram, and its pore size distribution is 4-5nm, which is a typical mesoporous material, which is conducive to the storage and rapid transport of electrolytes inside the active material.

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Abstract

The invention provides a preparation method of a carbon/iron oxide composite, comprising: mixing ferrous carbonate with a high-molecular organic matter, and heating and calcining in a protective atmosphere to obtain the carbon/iron oxide composite. Compared with the prior art, the method uses ferrous carbonate micro-particles as a raw material, the material may decompose into nano-scale iron oxide in subsequent high-temperature calcining, micro-structure of nanoparticles is accordingly obtained, the charge-discharge capacity is higher than that of solely nano-scale or micro-scale particles, and the structure is more stable; moreover, carbon material that is added may connect iron oxide active nanoparticles via three-dimensional network carbon, the carbon material can serve as a buffer and support, stress due to size changes of a substance is buffered, basic configuration of the substance is maintained, and the carbon material has high electrical conductivity so that the prepared carbon/iron oxide composite has high rate, high specific capacity and long cycle life.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a carbon / iron tetroxide composite material and a lithium ion battery. Background technique [0002] New energy Lithium-ion batteries are emerging energy sources. In order to meet the society's demand for high specific energy lithium batteries, people are actively exploring lithium battery anode materials with high theoretical specific capacity. [0003] The theoretical specific capacity of traditional lithium battery negative electrode material graphite is 372mAh / g, and the specific capacity of known lithium battery positive electrode materials (such as lithium iron phosphate, lithium cobalt oxygen, etc.) is also limited (100-200mAh / g), in order to adapt to people's In response to the demand for high-energy lithium batteries and the overall improvement of battery performance, researchers have explored and synthesized a series of a...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/52H01M10/0525
CPCH01M4/362H01M4/523H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 于洋
Owner SHANDONG SACRED SUN POWER SOURCES
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