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Coal-based anode material, preparation method and lithium-ion battery

A lithium-ion battery and anode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor processing performance, poor cycle performance, low capacity and efficiency

Inactive Publication Date: 2015-06-03
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the conventional acid deliming process, the use of acid is likely to cause safety hazards and cause pollution to the environment
Materials produced by conventional high-temperature graphitization have poor processability, low capacity and efficiency, poor compatibility with electrolyte, and poor cycle performance

Method used

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  • Coal-based anode material, preparation method and lithium-ion battery
  • Coal-based anode material, preparation method and lithium-ion battery
  • Coal-based anode material, preparation method and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] (1) Anthracite with a fixed carbon content of 80.0% is pulverized to D by a milling pin pulverizer 50 =13.6μm;

[0070] (2) mixing the above powder material with 2.0% (by weight) phosphoric acid and 5.0% epoxy resin in a V-type mixer for 5 minutes, and the mixing temperature is 80°C;

[0071] (3) Put it into the inner string graphitization furnace, feed the protective gas nitrogen, and graphitize at a temperature of 2800 °C;

[0072] (4) sieving and demagnetizing the graphitized product to obtain D 50 = 15.3 μm coal-based negative electrode material, other detection indicators are shown in Table 3.

Embodiment 2

[0074] (1) Pulverize the gas coal with a fixed carbon content of 99.0% by a ball mill to D 50 = 20.0 μm;

[0075] (2) mixing the above-mentioned powder material with 10.0% polyvinyl alcohol in a conical double-screw mixer for 60min, and the mixing temperature is 25°C;

[0076] (3) Put the mixed material into the Acheson graphitization furnace, feed the protective gas nitrogen and the purified gas fluorine gas respectively, and graphitize at a temperature of 3000 °C;

[0077] (4) sieving and demagnetizing the graphitized product to obtain D 50 = 28.0 μm coal-based negative electrode material, other detection indicators are shown in Table 3.

Embodiment 3

[0079] (1) The coking coal with fixed carbon content of 95.0% is pulverized by a turbo pulverizer to D 50 =5.0μm;

[0080] (2) Mix the above-mentioned powder material with 30.0% pitch and 5.0% titanium dioxide in a conical twin-screw mixer for 60 minutes, and the mixing temperature is 120°C;

[0081] (3) Press the mixed material into a volume density of 1.0g / cm with a horizontal hydraulic press 3 put the square pressed product into the Acheson graphitization furnace, pass the purified gas chlorine gas, and graphitize it at a temperature of 3200 °C;

[0082] (4) Pulverize the graphitized cubes to D 50 = 5.8 μm, sieving and demagnetization to obtain coal-based negative electrode material, other detection indicators are shown in Table 3.

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Abstract

The invention discloses a coal-based anode material, a preparation method and a lithium-ion battery. The coal-based anode material consists of a coal-based material graphitized inner layer, a middle layer and an outer layer distributed on the surface. The preparation method of the coal-based anode material comprises steps as follows: crushing a coal-based material; then adding a binder or mixing the binder and a modifier; then performing pressing and high-temperature graphitization to form a finished product. The coal-based anode material adopts a stable graphite structure, the surface has good compatibility with an electrolyte, and the coal-based anode material has the high specific capacity, the high conductivity, the high rate capability as well as excellent electrolyte absorbing performance and cycle performance. According to the preparation method, the anode material is prepared from the low-price coal-based material used as a raw material, the technology is simple, industrialization is easy to realize, and meanwhile, the application of the coal-based anode material in the field of the lithium-ion battery is promoted.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and particularly relates to a coal-based negative electrode material, a preparation method and a lithium ion battery. Background technique [0002] Lithium-ion batteries are now widely used by everyone. Traditional small lithium-ion batteries will show a steady growth trend driven by tablet computers and ultrabooks. Power batteries and energy storage batteries will be new growth points for the lithium-ion battery industry. Graphite negative electrode materials for lithium ion batteries are generally prepared from natural graphite or petroleum coke or coal char. Its structure is that carbon atoms are arranged in layers in a hexagonal ring and have good lithium intercalation performance. Coal, especially anthracite, as a carbon material, its main component is carbon, of which aromatic structure / molecular components account for a large proportion, and these aromatic structures or aromatic molecu...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/1393H01M4/38
CPCY02E60/10
Inventor 闫慧青岳敏刘福静李子坤宾得善
Owner BTR NEW MATERIAL GRP CO LTD
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