Synthetic graphite negative electrode material for lithium ion battery and preparation method as well as application thereof

A technology for artificial graphite negative electrodes and lithium-ion batteries, which can be used in battery electrodes, secondary batteries, chemical instruments and methods, etc., and can solve problems such as low compaction density, low specific capacity of artificial graphite, and low crystallinity

Active Publication Date: 2013-03-27
深圳市贝特瑞新能源技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with natural graphite, artificial graphite has a lower degree of graphitization (up to 93%), lower crystallinity, and a partial turbostratic structure, so the specific capacity of artificial graphite is lower (about 350mAh / g); The processing is difficult and the manufacturing cost is high; it is easy to rebound after compaction, and its compaction density is low

Method used

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  • Synthetic graphite negative electrode material for lithium ion battery and preparation method as well as application thereof
  • Synthetic graphite negative electrode material for lithium ion battery and preparation method as well as application thereof
  • Synthetic graphite negative electrode material for lithium ion battery and preparation method as well as application thereof

Examples

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preparation example Construction

[0070] The preparation method of lithium ion battery artificial graphite negative electrode material of the present invention comprises the following steps:

[0071] (1) The purity is 98.2%~99.2%, the average particle size is 6.6~60μm, and the specific surface area is 0.56~3.43m 2 A mixture of one or more non-metallic carbides / g is added to the inner series graphitization furnace, and the temperature rise rate is 1~20℃ / min, and the temperature range is 2400~3000℃ for 4~8h. The above reaction atmosphere is a vacuum atmosphere, or an atmosphere filled with protective gas and / or reducing gas; the gas flow rate is 0-150L / h, and then naturally cooled to room temperature to obtain the final product or use it as an intermediate product 1. The gas flow rate is the flow rate of the protective gas and / or reducing gas introduced in the reaction vessel. When the gas flow rate is 0L / h, the corresponding reaction atmosphere is a vacuum atmosphere, that is, it is not necessary to pass gas in...

specific Embodiment

[0115] The technology and parameter thereof of embodiment 1~6 and comparative example 1 are shown in table 2.

[0116] Among them, comparative example 1 only carried out graphitization treatment once without subsequent process on the basis of the preparation method of the present invention; comparative example 2 and comparative example 3 are the presentation of the general artificial graphite preparation method, and comparative example 2 is described in CN200610014878.6 The artificial graphite prepared by the artificial graphite preparation method; Comparative Example 3 is the artificial graphite prepared by the artificial graphite preparation method described in CN200410018079.7.

[0117] The process condition of table 2 embodiment 1-6 and comparative example 1

[0118]

[0119]

[0120] The test results of physical and electrical properties of the artificial graphite prepared in Examples 1-6 and Comparative Examples 1-3 are shown in Table 3.

[0121] The physical perf...

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Abstract

The invention relates to a preparation method of a synthetic graphite negative electrode material for a lithium ion battery. According to the method, nonmetal carbide is taken as a raw material and subjected to once high temperature decomposition or twice high temperature decomposition to prepare synthetic graphite, which belongs to the field of the lithium ion battery. The synthetic graphite negative electrode material for the lithium ion battery, provided by the invention, has high degree of graphitization, high compaction density, excellent electrochemical performance, higher specific capacity of lithium removal in the range of 360-365mAh/g, primary coulombic efficiency of 83%-90% and capacity retention ratio of more than 98.3% within 15 weeks, and is suitable for the volume type lithium ion battery, simple in production flow and easy for industrialization.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material and a preparation method thereof, in particular to an artificial graphite negative electrode material for a lithium ion battery and a preparation method thereof, belonging to the field of lithium ion batteries. Background technique [0002] Lithium-ion battery refers to a secondary battery system that uses two different lithium intercalation compounds that can reversibly intercalate and deintercalate lithium ions as the positive and negative electrodes of the battery, respectively. When charging, lithium ions are deintercalated from the positive electrode, passed through the electrolyte and separator, and inserted into the negative electrode; on the contrary, lithium ions are deintercalated from the negative electrode, passed through the electrolyte and separator, and inserted into the positive electrode. [0003] The negative electrode of the lithium-ion battery is formed by mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H01M10/0525H01M4/587H01M4/133C01B32/205
CPCY02E60/122Y02E60/10
Inventor 李子坤黄友元
Owner 深圳市贝特瑞新能源技术研究院有限公司
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