Lithium ion battery graphite anode material and preparation method thereof

A lithium-ion battery, graphite negative electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor charging and discharging performance, large particle size, etc., and achieve good stability in use, small particle size, and simple preparation method. Effect

Inactive Publication Date: 2015-03-18
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a lithium-ion battery graphite negative electrode material and its preparation method in order to overcome the defects of large particle size and poor charge and discharge performance of the existing graphite negative electrode materials

Method used

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  • Lithium ion battery graphite anode material and preparation method thereof
  • Lithium ion battery graphite anode material and preparation method thereof

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Effect test

Embodiment 1

[0027] Preparation of graphite anode material for lithium ion battery: The raw material is petroleum green coke A (volatile content 14wt%), which is crushed until the particle size of the powder is 5 μm, reacted in a high-temperature reactor at a final temperature of 550°C, and carbonized at 1100°C Treat for 12 hours, then graphitize at 2800°C for 20 days, and finally classify and control the particle size at 8 μm, with a yield of 72%.

Embodiment 2

[0029] Preparation of graphite anode material for lithium ion battery: The raw material is petroleum green coke A (volatile content 14wt%), which is pulverized until the particle size of the powder is 3 μm, reacted in a high-temperature reactor at a final temperature of 550°C, and carbonized at 1100°C Treat for 12 hours, then graphitize at 2800°C for 20 days, and finally classify and control the particle size to 6 μm, with a yield of 69%.

Embodiment 3

[0031] Preparation of graphite anode material for lithium ion battery: The raw material is petroleum green coke A (14wt% volatile matter), which is crushed until the particle size of the powder is 5 μm, reacted in a high-temperature reactor at a final temperature of 500°C, and carbonized at 1100°C Treat for 12 hours, then graphitize at 2800°C for 20 days, and finally classify and control the particle size to 8 μm, with a yield of 68%.

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Abstract

The invention discloses a lithium ion battery graphite anode material and a preparation method thereof. The preparation method comprises the following steps: roasting green coke with a median particle diameter D50 of 3-7 micrometers and volatile ingredients of 10wt percent-20wt percent, carbonizing, graphitizing, and fractionating to obtain the lithium ion battery graphite anode material, wherein the after fractionating, the median particle diameter D50 of the lithium ion battery graphite anode material is controlled to be 6-10 micrometers, and the maximum particle size is not more than 30 micrometers. The preparation method provided by the invention is simple; the industrialized large-scale production is easily realized; the prepared lithium ion battery graphite anode material is small in particle diameter, excellent in rate performance, small in first-time reversible capacity and good in use stability, and has good cycle performance.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery graphite negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion secondary battery is one of the most advanced batteries developed in the early 1990s. It has the characteristics of high voltage, large specific energy, long life and no memory effect. Since 1991, lithium-ion secondary batteries have been widely used in mobile phones, notebook computers, video cameras and electric vehicles. [0003] Lithium-ion battery anode materials are still dominated by graphite materials in practical applications. Artificial graphite and natural graphite have their own advantages and disadvantages as anode materials. Artificial graphite has the advantage of cycle stability, but its capacity is generally lower than that of natural graphite. Although natural graphite has the advantage of high capacity, its Achilles' heel ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583
CPCY02E60/10
Inventor 苗荣荣丁晓阳吴志红刘金峰马军旗
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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