Lithium-ion cell composite carbon negative polar material and preparing method

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of increasing the internal resistance of the battery, affecting the cycle performance, and destroying the electrode structure, and achieves easy operation, simple preparation process, and cost. low cost effect

Active Publication Date: 2006-10-25
ZHANJIANG JUXIN NEW ENERGY
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Problems solved by technology

However, in natural graphite in which graphite crystals are grown intact and in artificial graphite prepared by graphitization of coke or the like, the interlayer bonding force in the direction of the c-axis of the crystal is lower than that in the direction of the basal plane of the crystal, so that in the powder During the crushing process of body preparation, it is easy to form flake particles with a large aspect ratio. The flake particles form an orientation parallel to the current collector during the rolling process of electrode preparation, and lithium ions enter into the electrode during repeated charge and discharge. The large strain in the c-axis direction of the graphite will be caused when the graphite is extracted from the inside of the graphite crystal, which will lead to the destruction of the electrode structure and affect

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Example Embodiment

[0025] The preparation method of the composite carbon negative electrode material for lithium ion batteries of the present invention includes the following steps: 1. A graphite powder with a particle size of 0.3 to 30 μm and a fixed carbon content of ≥90.0%, and a binder with a weight of 1-40% of the graphite powder, Mixing and granulating, adding graphite powder and graphitization catalyst with 0.01-10% of binder weight at the same time; 2. Extruding the mixed pellets into a shape with a density of 1.3-1.9g / cm after molding 3 3. Carry out carbonization or graphitization of the molding material, heat it in a protective gas from 450°C to 3000°C, keep it for 1 to 10 hours, and then drop it to room temperature in a protective atmosphere; 4. Crush the above-mentioned composite carbon material; 3. Crush the above-mentioned composite carbon material; 5. Carry out purification treatment.

[0026] The graphite micropowder in the preparation method of the lithium ion battery composite carb...

Example Embodiment

[0046] In Example 1, 100 parts by weight of natural graphite powder with an average particle size of 5μm and a carbon content of 93.6% were added to 20 parts by weight of petroleum pitch, 10 parts by weight of coal tar, and 10 parts of silicon carbide (the amount of addition of Si equivalent to 5.3wt%) The parts by weight are mixed and granulated at a temperature of 150°C and pressed into cylindrical graphite blocks with a pressing density of 1.9g / cm 3 , Graphitized at a temperature of 2800°C for 4 hours, then cooled to room temperature, and pulverized with a high-pressure mill to obtain composite carbon particles with an average particle size of 20μm. Such as figure 2 As shown, it can be seen from the scanning electron microscope photo of the composite carbon particles that the composite carbon particles are secondary particles formed by combining multiple graphite powders. This is measured by the JEOLJSM-6380LV scanning electron microscope and the Millitrac particle image analy...

Example Embodiment

[0048] In Example 2, 50 parts by weight of natural graphite powder with an average particle size of 10 μm and a carbon content of 96.4% and 50 parts by weight of artificial graphite powder with the same particle size and carbon content were mixed uniformly, 10 parts by weight of petroleum pitch and 20 parts by weight of coal tar were added. , 17 parts by weight of boron carbide (10wt% equivalent to B) is mixed and granulated at a temperature of 150°C, and compressed into cylindrical graphite blocks with a density of 1.65g / cm 3 Graphitized at 3000°C for 1 hour, then cooled to room temperature, and pulverized with a low-speed impact spheroidizing mill to obtain composite carbon particles with an average particle size of 20 μm. From the scanning electron micrograph of the composite carbon particles, it can be seen that the composite carbon particles are secondary particles combined with a number of graphite micropowders. The length-to-diameter ratio of the composite carbon material i...

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Abstract

This invention discloses a complex carbon negative material of Li ionic batteries and its preparation method, in which, the material is natural graphite micro-powder, artificial graphite micro-powder or complex graphite particles of natural and artificial graphite micro-powder combined by binding agents, the hexagon carbon layers of graphite crystals are arrayed randomly, the particles include nm or sub-mum holes, the preparation method includes: mixed-prilling, extruding to molding, carbonized process or graphitized process, heating and cooling and crushing.

Description

technical field [0001] The invention relates to a battery negative electrode material and a preparation method thereof, in particular to a lithium ion battery composite carbon negative electrode material and a preparation method thereof. Background technique [0002] The oil crisis in the 1960s and 1970s and the increasing population made the contradiction of resource shortage increasingly prominent. Especially today, when people pay more and more attention to environmental protection, green power sources have developed rapidly. Lithium-ion batteries are a new generation of secondary batteries following the nickel-hydrogen batteries since the 1990s. And because of its advantages such as high working voltage, high energy density, long cycle life, small self-discharge, and no memory effect, it has become the preferred chemical power source for high-end electronic consumer products, and has penetrated into aerospace, military and other cutting-edge technology fields. With its ...

Claims

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Application Information

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IPC IPC(8): C01B31/02H01M4/583
CPCY02E60/10
Inventor 吴其修安秀梅刘正荣
Owner ZHANJIANG JUXIN NEW ENERGY
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