Petroleum coke-based high-first-effect artificial graphite for negative electrode of lithium ion battery, preparation method of petroleum coke-based high-first-effect artificial graphite and lithium ion battery

A lithium-ion battery and artificial graphite technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of low initial discharge efficiency and capacity, hindered charging and discharging speed, poor performance of contaminated graphite, etc., and achieve green raw materials Environmental protection, improved performance, good effect of high rate discharge performance

Pending Publication Date: 2022-05-13
HAIKE GRP RES INST OF INNOVATION & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Graphite material has the characteristics of good conductivity, high crystallinity, low price, and high safety. It is currently the most important negative electrode material in the production of commercial lithium-ion batteries. However, affected by its own structure, lithium ions need to be By detour, the charging and discharging speed is hindered, so it is limited when charging and discharging with high current, and the first discharge efficiency and capacity are low
Artificial graphite lithium ions are relatively easy to intercalate and extract, but the capacity is only 300mAh / g, which is relatively poor compared to natural graphite, so corresponding improvements are required. For example, patent CN1331253C discloses a manufacturing method for lithium ion battery negative electrode materials. Polymer materials are coated to prepare artificial graphite, but there are still problems such as cumbersome process, high cost, large pollution and poor performance of prepared graphite.

Method used

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  • Petroleum coke-based high-first-effect artificial graphite for negative electrode of lithium ion battery, preparation method of petroleum coke-based high-first-effect artificial graphite and lithium ion battery

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preparation example Construction

[0068] The present invention provides a method for preparing high first-effect artificial graphite, comprising the following steps:

[0069] 1) After washing and purifying the crushed petroleum coke, the purified petroleum coke is obtained;

[0070] 2) After carbonization and graphitization of the purified petroleum coke obtained by the above steps, artificial graphite is obtained.

[0071] The present invention of the above preparation method of raw materials and product parameters, selection, and the corresponding principle of preference, and the parameters of the raw materials and products in the foregoing high-first effect artificial graphite, selection, and the corresponding preferred principles may be corresponding, and will not be repeated here.

[0072] The present invention first purifies the crushed petroleum coke after washing and purification, to obtain purified petroleum coke.

[0073] In principle, the present invention has no special restrictions on the specific sele...

Embodiment 1

[0105] Using petroleum coke as raw material, the petroleum coke is coarsely crushed by the crusher, and then finely broken, the air flow crusher is crushed into the filter cloth, 0.1mol / l potassium hydroxide solution is added, stirred at a stirring rate of 300r / min, and then added 0.1mol / l dilute hydrochloric acid solution to the filter cloth after the completion of the filtering, also stirred at a stirring rate of 300r / min, and finally added water to wash to neutral, the petroleum coke raw materials are taken out and dried, and the sample is sampled for particle size test, and the particle size is 20μm After purification, petcoke is carbonized at 800 ° C; the intermediate substances treated with carbonization are graphitized at 2900 ° C for 5h, and artificial graphite of the present invention can be obtained.

[0106] Purification of petroleum coke prepared in Embodiment 1 of the present invention is detected.

[0107] The results showed that the ash of purified petcoke was divid...

Embodiment 2

[0114] Using petroleum coke as raw material, the petroleum coke is coarsely crushed by the crusher, and then finely broken, the air flow crusher is crushed into the filter cloth, 0.1mol / l potassium hydroxide solution is added, stirred at a stirring rate of 300r / min, and then added 0.1mol / l dilute hydrochloric acid solution to the filter cloth after the completion of the filtering, also stirred at a stirring rate of 300r / min, and finally added water to wash to neutral, the petroleum coke raw materials are taken out and dried, and the sample is sampled for particle size test, and the particle size is 20μm The purified petcoke is charred at 800 ° C; the intermediate substances treated by carbonization are graphitized at 3000 ° C for 5h, and artificial graphite of the present invention can be obtained.

[0115] Artificial graphite prepared in Embodiment 2 of the present invention is subject to performance testing. Artificial graphite is used to make anode plates of lithium-ion batteri...

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Abstract

The invention provides high-first-effect artificial graphite for a negative electrode of a lithium ion battery. The artificial graphite is prepared from purified petroleum coke which is washed and purified; the purified petroleum coke has a smooth and regular surface structure. According to the method, the purified petroleum coke with a specific microstructure is obtained by washing and purifying the raw material petroleum coke, and then the petroleum-based artificial graphite with high first efficiency is obtained through graphitization. According to the present invention, the purification and graphitization combined method is adopted, such that the prepared artificial graphite has characteristics of high capacity and high first efficiency, the preparation process is simple, and the raw materials are cheap, easily available, green and environmentally friendly. The prepared high-first-effect petroleum-based artificial graphite can be directly used for preparing a lithium ion battery negative electrode material, the problem that the first effect and the capacity of a lithium ion battery are low is effectively solved, and the performance of the lithium ion battery is improved.

Description

Technical field [0001] The present invention belongs to the field of lithium-ion battery anode technology, relates to a high-first-effect artificial graphite for lithium-ion battery anode and a preparation method thereof, a lithium-ion battery, in particular to a petroleum coke-based high-first-effect artificial graphite for lithium-ion battery anode and a preparation method thereof, a lithium-ion battery. Background [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, long cycle life, light weight, less self-discharge, no memory effect and high performance-price ratio, and have become the main choice of rechargeable power supplies in high-power electric vehicles, artificial satellites, aerospace and other fields. Especially in practical applications, lithium-ion batteries have become an ideal energy source for all kinds of portable electronic devices, such as laptops, mobile phones, etc. In recent years, electric vehicles and other n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205H01M4/587H01M10/0525
CPCC01B32/205H01M4/587H01M10/0525H01M2004/027
Inventor 朱振涛贾国文刘磊赵新新苗力孝马俊青
Owner HAIKE GRP RES INST OF INNOVATION & TECH
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