Artificial graphite negative electrode material for lithium ion battery and preparation method thereof

An artificial graphite negative electrode, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low capacity, low degree of graphitization, low compaction density, etc., and achieve long cycle life and high rate performance. , the effect of increasing capacity and compaction density

Active Publication Date: 2014-10-08
贝特瑞(江苏)新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The artificial graphite negative electrode material of the present invention can not only maintain the firm structural stability of the artificial graphite negative electrode material for lithium ion batteries in the prior art, excellent lithium intercalation characteristics, long cycle life, high rate performance, excellent pole piece processability, etc. , and at t

Method used

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  • Artificial graphite negative electrode material for lithium ion battery and preparation method thereof
  • Artificial graphite negative electrode material for lithium ion battery and preparation method thereof
  • Artificial graphite negative electrode material for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The needle coke with a carbon content of 93.0% and a volatile content of 10.0% is crushed, spheroidized, and graded to obtain a 3-50 μm powder material; The mass ratio of 100:15:10 is mixed with a kneader. After mixing evenly, the above material is cold molded to obtain a cylindrical molded product. The processing temperature is 25°C, the processing pressure is 20.0MPa, and the processing time is 0.2h. Put the above-mentioned cylindrical shaped product at 600°C for thermal roasting treatment for 360 hours, and after cooling to room temperature, crush and ball mill the above-mentioned pressed product. The ball-milling treatment time is 480 minutes, the processing temperature is 30.0°C, and the rotation speed is 600r / min. The above powder was graphitized at 3300° C. for 12 hours, and the obtained material was sieved, demagnetized, and sieved to obtain a lithium-ion battery graphite negative electrode material with an average particle size of 16.8 μm.

Embodiment 2

[0057] The petroleum residue with a carbon content of 85.0% and a volatile content of 18.0% is crushed, spheroidized, and graded to obtain a 3-50 μm powder material; : The mass ratio of 12:5 is mixed with a kneader. After mixing evenly, the above materials are subjected to isostatic pressing to obtain a square-shaped pressed product. The processing temperature is 200°C, the processing pressure is 150.0MPa, and the processing time is 2.0h. Put the above-mentioned square-shaped pressed product at 900°C for 240 hours, and after cooling to room temperature, crush and ball-mill the above-mentioned pressed piece. min. The above powder was graphitized at 3300° C. for 16 hours, and the obtained material was sieved, demagnetized, and sieved to obtain a lithium-ion battery graphite negative electrode material with an average particle size of 17.5 μm. figure 2 It is the charge-discharge cycle performance diagram at normal temperature 1C of the present embodiment.

Embodiment 3

[0059] The mesophase carbon microspheres with a carbon content of 99% and a volatile content of 5% are crushed, spheroidized, and graded to obtain a 3-50 μm powder material; According to the mass ratio of 100:8:12, the vacuum kneader is used for mixing treatment. After mixing evenly, the above materials are subjected to isostatic pressing treatment to obtain a block-shaped pressed product. The treatment temperature is 300 ° C, the treatment pressure is 120.0 MPa, and the treatment time is 1.0h. Put the above-mentioned square-shaped molded product at 450°C for 450 hours of thermal roasting treatment, and after cooling to room temperature, carry out crushing and fusion treatment on the above-mentioned pressed molded product. min. The above powder was graphitized at 3350° C. for 18 hours, and the obtained material was sieved, demagnetized, and sieved to obtain a lithium-ion battery graphite negative electrode material with an average particle size of 19.8 μm.

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Abstract

The invention discloses an artificial graphite negative electrode material for a lithium ion battery and a preparation method thereof. The preparation method for the artificial graphite negative electrode material comprises the following steps: preparing powder, adding a binder and/or a crystal nucleus-induced growth additive, kneading, carrying out compression molding, thermally roasting, carrying out nodulizing shaping and/or fusing, carrying out ultrahigh-temperature graphitization, screening, removing magnetism and screening. The preparation method disclosed by the invention is simple to operate, easy to control, lower in production cost and suitable for industrial production. The prepared artificial graphite negative electrode material has high graphitization degree, high compactness, high capacity, high coulombic efficiency, high conductivity and high multiplying power, and can be used for the lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular, the invention relates to an artificial graphite negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] In recent years, lithium-ion batteries have been widely used in various notebook computers, mobile phones, digital cameras, portable electronic products, and vehicle and energy storage devices. Lithium-ion battery, as a new type of rechargeable battery, has the advantages of high voltage, high energy density, environmental protection, no pollution, and no memory effect. It is recognized as the "most Promising ideal energy". At present, one of the key technologies of commercial lithium-ion batteries lies in the selection and application of negative electrode materials. Among the existing negative electrode materials, graphite materials have low lithium intercalation / deintercalation potential, high reversibl...

Claims

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Application Information

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IPC IPC(8): C01B31/04H01M4/587H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 岳敏闫慧青钟正李子坤吴敦勇
Owner 贝特瑞(江苏)新材料科技有限公司
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