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High-tap-density spherical graphite as well as preparation method and application thereof

A technology of spherical graphite and tap density, which is applied to graphite, chemical instruments and methods, structural parts, etc., can solve the problems of low tap density of spherical graphite, affecting the volume specific energy of natural graphite negative electrode tap density batteries, etc., to improve The effect of tap density

Active Publication Date: 2021-06-25
GUANGDONG DONGDAO NEW ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when natural graphite is used as a negative electrode material for lithium-ion batteries, it is necessary to crush, reshape, and classify natural graphite into spherical graphite to increase its tap density, but the tap density of the prepared spherical graphite is still low, which affects Tap density of natural graphite anode and volume specific energy of battery

Method used

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  • High-tap-density spherical graphite as well as preparation method and application thereof
  • High-tap-density spherical graphite as well as preparation method and application thereof
  • High-tap-density spherical graphite as well as preparation method and application thereof

Examples

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preparation example Construction

[0039] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0040] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

Embodiment 1

[0042] At room temperature, 10g of spherical graphite (D 50 8μm, tap density 0.7g / cm 3 , The specific surface area is 9.5m 2 / g) immersed in a saturated hydrogen peroxide solution and stirred for 50 minutes, washed with deionized water and then dried at 100° C. to obtain an intermediate product. The intermediate product was heated to 500° C. for 30 minutes under a nitrogen atmosphere, and then cooled to room temperature. Then it was processed in a fusion machine (rotating speed 1160r / min) for 15 minutes to obtain highly compacted spherical graphite. Then, the high softening point asphalt with a softening point of 200°C was crushed to 3 μm in an impact mill, and mixed with the high-tapping spherical graphite prepared above at a mass ratio of 0.8:100. 2 Under protection, treat at 1200°C for 4 hours, cool to room temperature, disperse, sieve, and demagnetize to obtain natural graphite negative electrode material.

Embodiment 2

[0044] At room temperature, 10 g of spherical graphite (D 50 16μm, tap density 0.9g / cm 3 , The specific surface area is 6.5m 2 / g) immersed in a saturated solution of sodium hypochlorite and stirred for 30 minutes, washed with deionized water and then dried at 80° C. to obtain an intermediate product. The intermediate product was heated to 400° C. for 50 minutes under a nitrogen atmosphere, and then cooled to room temperature. Then it was processed in a fusion machine (rotating speed 1080r / min) for 10 minutes to obtain highly compacted spherical graphite. Put the high-tapped spherical graphite prepared above into a rotary furnace, and in an argon atmosphere with a flow rate of 100 L / min and an environment of 800 ° C, feed methane at a flow rate of 1 L / min for 2 hours, and then switch to argon. gas, cooled to room temperature, dispersed, sieved, and demagnetized to obtain the natural graphite anode material.

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Abstract

The invention provides high-tap-density spherical graphite as well as a preparation method and application thereof. According to the method, in the stirring process of a liquid-phase oxidizing agent and spherical graphite, the surface of the spherical graphite is oxidized to form a series of grooves and becomes rough, so that the tap density of an intermediate product is reduced, but small particles are more easily embedded into large particles during fusion treatment of the rough surface of the spherical graphite, and the surface of the spherical graphite is smoother and smoother. Therefore, the tap density of the material is improved. In addition, the liquid-phase oxidizing agent also enters internal gaps of the curled carbon layer of the spherical graphite, and the curled carbon layer is densified during high-temperature sintering, so that the tap density of the curled carbon layer is further improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery negative electrode materials, and in particular relates to a high-tap spherical graphite, a preparation method thereof, and an application in lithium-ion battery negative electrode materials. Background technique [0002] Lithium-ion batteries have become a new generation of secondary batteries since the 1990s after nickel-metal hydride batteries because of their advantages such as high operating voltage, high energy density, long cycle life, small self-discharge, and no memory effect. In the development process of lithium-ion battery technology, the quality of batteries has been continuously improved, and the production cost has been continuously reduced. Anode materials have played a large role in the contribution to the technological progress of lithium-ion batteries. [0003] At present, the anode materials of commercial lithium-ion batteries are still dominated by graphite materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/20C01B32/205H01M4/583H01M4/62H01M10/0525
CPCC01B32/20C01B32/205H01M10/0525H01M4/583H01M4/625Y02E60/10
Inventor 王宪叶雨佐江涌潮吴有铭
Owner GUANGDONG DONGDAO NEW ENERGY
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