Spherical hard carbon lithium ion battery cathode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low compaction density, low battery energy density, fast intercalation, and low delithiation ability, and achieve a simple preparation method Effect

Active Publication Date: 2012-03-21
JIXI BTR GRAPHITE IND PARK CO LTD +3
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Problems solved by technology

However, the compaction density of irregular hard carbon materials in the prior art is low, only 1.0g / cm 3 , leading to low energy density of batteries made of this material, and at the same time, low ability to quickly intercalate and delithiate

Method used

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  • Spherical hard carbon lithium ion battery cathode material and preparation method thereof
  • Spherical hard carbon lithium ion battery cathode material and preparation method thereof
  • Spherical hard carbon lithium ion battery cathode material and preparation method thereof

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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. The spherical hard carbon lithium-ion battery negative electrode material of the present invention uses hard carbon as a matrix, the matrix is ​​coated with carbon materials, the carbon material precursor is 1 to 15% of the mass of the matrix, and the shape of the spherical hard carbon lithium-ion battery negative electrode material is spherical. , the particle size range is 1-30 μm, the hard carbon negative electrode material is amorphous carbon, the 002 peak is at 22.6°-23.8°, and the diffraction peak is broadened, the interlayer distance D of the 002 crystal plane 002 Between 0.360~0.480nm, the specific surface area is 1.0~73.2m 2 / g, the true density is 1.50~2.20g / cm 3 , the tap density is 0.95~1.52g / cm 3 , the compacted density is 1.08~1.63g / cm 3 .

[0024] The preparation method of spherical hard carbon lithium ion battery negative ele...

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Abstract

The invention discloses a spherical hard carbon lithium ion battery cathode material and a preparation method thereof, aiming to solve the technical problem of improving the capacity retention ratio and rapid charging / discharging capacity of the material. The spherical hard carbon lithium ion battery cathode material adopts hard carbon as a basal body, carbon material is coated outside the basal body, and the 002 peak is at 22.6-23.8 degrees. The preparation method comprises ball milling a hard carbon precursor to granules, placing the granules into a water solution containing surfactant, ball milling to obtain a dispersion of the hard carbon precursor, drying, coating, and carrying out pyrolytic decomposition treatment. Compared with the prior art, the prepared spherical hard carbon material has a compacted density greater than 1.1 g / cm<3>, an initial coulombic efficiency greater than 80%, capacity retention ratio after 500 cycles greater than 85%, and 30C / 1C capacity retention ratiogreater than 98%, and has excellent rapid lithium ion intercalation and deintercalation capacity, and simple preparation method.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material and a preparation method thereof, in particular to a hard carbon negative electrode material and a preparation method thereof. Background technique [0002] Hard carbon materials have a high capacity higher than the theoretical capacity of graphite (372mAh / g), excellent rate performance and cycle performance. It is consistent with the high specific energy, high safety, high current fast charge and discharge, and long service life required by current power tools and electric vehicles for lithium-ion battery electrode materials, and has received global attention. At present, the hard carbon materials prepared by using resin and plant raw materials are irregular flakes or blocks. Chinese Patent Publication Nos. CN1169249C and CN101916845A disclose methods for preparing irregular hard carbon materials by using plant raw materials. Chinese Patent Publication No. CN101887966A disclos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCY02E60/12Y02E60/10
Inventor 岳敏安红芳汪福明黄友元刘祥
Owner JIXI BTR GRAPHITE IND PARK CO LTD
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