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Preparation method of power battery negative electrode material and negative electrode material prepared by the method

A negative electrode material, power battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high viscosity, difficult to mix evenly, and achieve consistent crystal orientation, good cycle stability, and good rate performance. Effect

Inactive Publication Date: 2020-11-03
青岛科硕新材料科技有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

After the asphalt is softened at high temperature, the viscosity is relatively high, and it is not easy to mix evenly with graphite powder

Method used

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  • Preparation method of power battery negative electrode material and negative electrode material prepared by the method
  • Preparation method of power battery negative electrode material and negative electrode material prepared by the method
  • Preparation method of power battery negative electrode material and negative electrode material prepared by the method

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Embodiment 1

[0031] Embodiment 1: a preparation method of a power battery negative electrode material, comprising the following steps:

[0032] (1) Mixing: Take 6kg of graphite powder, 3kg of asphalt, and 1kg of naphthalene, and stir and mix graphite powder, asphalt, and naphthalene at 150°C for 3 hours according to the above ratio to obtain a premix;

[0033] (2) Recovery of naphthalene: the premix is ​​heated to 210°C to vaporize the naphthalene, the naphthalene is separated from the premix, and the fine material is obtained after cooling down;

[0034] (3) Carbonization: the fine material is carbonized under the protection of nitrogen, and the specific process includes:

[0035] Low temperature preheating stage: the fine material is heated from room temperature to 340°C and kept at a constant temperature for 3 hours; the heating rate is 1°C / min;

[0036] Medium temperature coking stage: from 340°C to 800°C, constant temperature for 4 hours; heating rate is 1.5°C / min;

[0037] High-tem...

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Abstract

The invention relates to a preparation method of a power battery negative electrode material and the negative electrode material prepared by the method. The preparation method of the power battery negative electrode material comprises the following steps of stirring and mixing graphite powder, asphalt and naphthalene for 2-6 hours under 150-180 DEG C according to a proportion being (6-8):(1-3):1 to prepare a pre-mixing substance; heating the pre-mixing substance to 210-250 DEG C, and recycling naphthalene to obtain a fine material; heating the fine material under protection of an inert gas to1,250-1,260 DEG C from a room temperature, and performing carbonization for 22-33 hours to obtain a carbide; and smashing and sieving the carbide to prepare the battery negative electrode. The batterynegative electrode material prepared by the method has relatively good structural stability, a raw material is coated with a liquid phase, more uniform mixing is achieved, and the lithium ion batteryprepared by employing the battery negative electrode material has the characteristics of high conductivity and stable cycle property.

Description

technical field [0001] The invention relates to the field of electrode materials for power batteries, in particular to a method for preparing a negative electrode material for a power battery and the negative electrode material prepared by the method. Background technique [0002] At present, with the gradual miniaturization and integration of electronic equipment, secondary batteries in electronic equipment are gradually developing in the direction of light weight and high capacity. Lithium-ion batteries in secondary batteries have developed rapidly in recent years. Lithium-ion batteries usually include a positive electrode and a negative electrode. The positive electrode usually uses lithium manganese oxide or lithium cobalt oxide as the active material, and the negative electrode usually uses graphite with a layered structure. When a lithium-ion battery is being charged and discharged, lithium ions in the positive electrode material are intercalated or extracted in the l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/36H01M4/625Y02E60/10
Inventor 苏红报苏方征
Owner 青岛科硕新材料科技有限公司
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