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High-capacity high-rate graphite negative pole material used for lithium ion battery and preparation method thereof

A lithium-ion battery, graphite anode technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of poor electrolyte compatibility, high pollution, difficult to control the graphite layer spacing, etc. Mild processing technology and good controllability

Active Publication Date: 2018-11-16
贵州中科星城石墨有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional high-layer spacing graphite material is a low-expansion material obtained by oxidizing intercalation, washing, drying, and heat treatment. During the preparation process of this material, the graphite interlayer spacing is difficult to control, and the conductivity of graphite is damaged. Seriously, some functional groups will remain on the surface of graphite, and the compatibility with the electrolyte will become poor
In addition, this traditional preparation method needs to use a large amount of strong oxidizing concentrated acid, and the pollution degree of the preparation process is high.

Method used

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  • High-capacity high-rate graphite negative pole material used for lithium ion battery and preparation method thereof

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Effect test

Embodiment 1

[0020] A preparation method of high-capacity, high-rate graphite negative electrode material for lithium-ion batteries, the steps are as follows:

[0021] (I) Petroleum asphalt and biomass tar with a softening point of 120°C and D50=3.5 μm were used as raw materials, in which aromatic hydrocarbons accounted for 21% of biomass tar, phenols accounted for 45%, and the mass ratio of asphalt to tar was 100:8. Under nitrogen atmosphere, 300 rpm mechanical stirring, and 400° C., polycondensation and crosslinking were carried out for 12 hours to obtain a crosslinked mesophase pitch.

[0022] (II) The cross-linked mesophase pitch was treated in a nitrogen atmosphere at a low temperature of 600 °C for 5 hours, and the temperature was naturally cooled to room temperature. The resulting green coke was depolymerized by multiple round mills, and then classified to obtain a precursor with D50=15 μm.

[0023] (Ⅲ) The precursor is graphitized under a nitrogen atmosphere at 3000°C for 2 hours ...

Embodiment 2

[0025] A preparation method of high-capacity, high-rate graphite negative electrode material for lithium-ion batteries, the steps are as follows:

[0026] (I) Coal tar pitch and biomass tar with a softening point of 200°C and D50=4.4 μm were used as raw materials, in which aromatic hydrocarbons accounted for 32% of biomass tar, phenols accounted for 40%, and the mass ratio of pitch to tar was 100:3. Under the conditions of argon atmosphere, 300rpm mechanical stirring, and 450°C, polycondensation and crosslinking were carried out for 24 hours to obtain a crosslinked mesophase pitch.

[0027] (II) The cross-linked mesophase pitch was treated in an argon atmosphere at a low temperature of 600 °C for 3 h, and the temperature was naturally cooled to room temperature. The resulting green coke was depolymerized by multiple round mills, and then classified to obtain a precursor with D50=15 μm.

[0028] (Ⅲ) The precursor is graphitized under an argon atmosphere at 3200°C for 2 hours t...

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Abstract

The invention provides a high-capacity high-rate graphite negative pole material used for a lithium ion battery and a preparation method thereof. The interlayer spacing of the material is 0.3382-0.3410 nm, D50 is equal to 15 mu m, the half-cell specific capacity is 360-365 mAh / g, and after a finished product battery is prepared, the pole piece compaction density of the material is 1.65-1.75 g / cc.According to the high-capacity high-rate graphite negative pole material used for the lithium ion battery, pitch and biomass tar are used as raw materials, the material is prepared through cross-linking, polycondensation and graphitization treatment, the preparation method is simple and clean, and industrialization is easy.

Description

technical field [0001] The invention relates to an artificial graphite negative electrode material and a preparation method thereof, in particular to a high-capacity, high-rate graphite negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] Graphite material is used in the negative electrode of lithium-ion batteries, which has the advantages of low voltage platform and good electrical conductivity, and is currently the leading material for lithium-ion battery negative electrodes. However, with the rapid development of electric vehicles, traditional graphite anodes can no longer meet the high capacity and high rate requirements of batteries. [0003] The graphite layer is not only a storage space for lithium ions, but also a solid-phase diffusion channel for lithium ions. If the interlayer spacing of graphite is increased, not only the capacity of the material can be increased, but also the rate charge and dischar...

Claims

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Application Information

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IPC IPC(8): C01B32/205H01M4/587H01M10/0525
CPCC01B32/205H01M4/587H01M10/0525Y02E60/10
Inventor 石磊王志勇陶振友邵浩明
Owner 贵州中科星城石墨有限公司
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