Low-temperature long-service-life natural graphite negative electrode material as well as preparation method and application thereof

A technology of natural graphite and negative electrode materials, which is applied in the preparation/purification of graphite and carbon, battery electrodes, etc., and can solve problems such as the difficulty of covering multiple flake graphite layers, the inability to use natural graphite negative electrode materials, and the high viscosity of asphalt. Achieve the effects of improved cycle life, long service life, and good low-temperature charge and discharge performance

Pending Publication Date: 2022-08-09
GUANGDONG DONGDAO NEW ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has also been reported in the prior art that modifiers are pressed into the voids of spherical graphite by means of isostatic pressing, or that modifiers are pressed into the voids of spherical graphites by means of vacuum and pressurization. These two methods Although both have greatly improved the cycle performance of natural graphite, due to the high viscosity of pitch, it is difficult to cover the multiple flake graphite layers curled inside the spherical graphite, and the existing natural graphite negative electrode materials cannot be used in low temperature environments.

Method used

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  • Low-temperature long-service-life natural graphite negative electrode material as well as preparation method and application thereof

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[0041] The preparation method of the present invention will be described in further detail below with reference to specific examples. 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 implemented based on the above content of the present invention are covered within the intended protection scope of the present invention.

[0042] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents, materials, etc. used in the following examples can be obtained from commercial sources unless otherwise specified.

Embodiment 1

[0044] (1) Add 20 g of asphalt to 150 g of washing oil, and stir at high speed (20 r / min) to fully dissolve the asphalt to obtain an asphalt solution (kinematic viscosity at 100° C. 90 mPa·S);

[0045](2) put 100g natural graphite into the reactor, vacuumize for 60min, when the vacuum degree of the reactor reaches 0.07MPa, open the pitch solution suction valve, all the pitch solutions obtained in step (1) are sucked into the reactor, and the liquid feed is completed Then close the suction valve, stop vacuuming, and at the same time stir the mixture at a high speed (20r / min) for 40min, pressurize (12MPa) after immersion, depressurize to make the pressure inside and outside the reactor the same, pass nitrogen and heat to 230℃ remove wash oil;

[0046] (3) after all the washing oil in the reaction kettle of step (2) is discharged, under the condition that the pressure is 1.5MPa, the reaction kettle is heated to 410°C for 10h according to the heating rate of 5°C / min to carry out t...

Embodiment 2

[0050] (1) Add 25 g of asphalt to 200 g of naphthalene oil, and stir at high speed (30 r / min) to fully dissolve the asphalt to obtain an asphalt solution (kinematic viscosity at 100° C. 100 mPa·S);

[0051] (2) put 100g natural graphite into the reactor, vacuumize for 50min, when the vacuum degree of the reactor reaches 0.07MPa, open the pitch solution suction valve, all the pitch solutions obtained in step (1) are sucked into the reactor, and the liquid feed is completed Then close the suction valve, stop vacuuming, and at the same time stir the mixture at a high speed (30r / min) for 40min, pressurize (15MPa) after immersion, depressurize to make the pressure inside and outside the reactor the same, and heat it to 250℃ by introducing nitrogen remove naphthalene oil;

[0052] (3) after all the naphthalene oil in the reaction kettle of step (2) is discharged, under the condition that the pressure is 2.0MPa, the reaction kettle is heated to 420°C for 8h according to the temperatu...

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Abstract

The invention provides a low-temperature long-service-life natural graphite negative electrode material as well as a preparation method and application thereof. The method comprises the following steps: exhausting air in natural graphite under vacuum, coating the surface of the natural graphite with a low-viscosity asphalt solution at high temperature and high pressure, immersing the asphalt solution into the surface of each curled flake graphite layer in the natural graphite, and converting the low-softening-point asphalt into mesophase asphalt through high-temperature heating polymerization reaction, so as to obtain the mesophase asphalt. Finally, further compacting each curled flake graphite layer in the mesophase pitch and the natural graphite by adopting an isostatic pressing technology, so that no gap exists in the natural graphite; the mesophase pitch has high residual carbon, and the amorphous carbon can be coated on each curled flake graphite layer in the natural graphite in the final carbonization process. Through the method, synchronous modification and integration of the surfaces of the curled crystalline flake graphite layers in the natural graphite can be realized.

Description

technical field [0001] The invention relates to the technical field of carbon negative electrode materials for lithium ion batteries, in particular to a low-temperature and long-life natural graphite negative electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have a series of advantages such as high specific capacity, high operating voltage, good safety, and no memory effect, and are widely used in 3C products, power devices and energy storage equipment. In recent years, with the increasing requirements for miniaturization, light weight, multi-function, and long-term driving of electronic products and automotive and energy storage equipment, the requirements for high energy density, high rate performance and long cycle life of lithium-ion batteries are increasing. constantly improving. [0003] As one of the core components of the battery, the negative electrode material plays a key role in the overall pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/21C01B32/05H01M4/133H01M4/587
CPCC01B32/21C01B32/05H01M4/587H01M4/133Y02E60/10
Inventor 叶雨佐刘明东吴其修肖玮
Owner GUANGDONG DONGDAO NEW ENERGY
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