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Artificial graphite lithium ion battery anode material and preparation method thereof

A lithium-ion battery, artificial graphite technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low capacity and poor compaction performance of lithium-ion battery carbon anode materials, and achieve the first discharge capacity improvement, comprehensive Excellent performance and good safety performance

Active Publication Date: 2014-06-25
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to overcome the problems of low capacity and poor compaction performance of lithium ion battery carbon negative electrode materials, and provide a kind of artificial graphite lithium ion battery negative electrode material and its preparation method, the artificial graphite lithium ion negative electrode material High compaction density and high initial discharge capacity, and the preparation method is simple and easy

Method used

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  • Artificial graphite lithium ion battery anode material and preparation method thereof
  • Artificial graphite lithium ion battery anode material and preparation method thereof
  • Artificial graphite lithium ion battery anode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034] A method for preparing an artificial graphite lithium-ion battery negative electrode material, comprising the following steps: ① kneading coal tar soft pitch and nano silicon powder in a pitch kneader at 80° C. for 2 hours at a weight ratio of 5:1 until the mixture is uniform Afterwards, carry out thermal polymerization reaction at 420°C for 3 hours; ②The product after the reaction is subjected to decompression treatment, the temperature of decompression treatment is 350°C, the vacuum degree of decompression treatment is -0.08MPa, and the decompression treatment time is 1 hour ; ③Carry out carbonization treatment at 1150°C for 5 hours under the protection of an inert gas to obtain block materials, which are crushed and classified by a crushing and classifying machine to obtain particles with a D50 particle size of 20.2 μm; ④at 3000°C The graphitization treatment was carried out for 5 hours to obtain the artificial graphite lithium ion battery negative electrode material ...

Embodiment 2

[0036] The preparation method of artificial graphite lithium-ion battery negative electrode material, it comprises the following steps: ① knead coal tar soft pitch and nano-silicon dioxide at 80 ℃ in a pitch kneader for 2 hours at a weight ratio of 10:1, until mixed After uniformity, thermal polymerization reaction was carried out at 400°C for 4 hours; ②The product after the reaction was subjected to decompression treatment, the temperature of decompression treatment was 370°C, the vacuum degree of decompression treatment was -0.09MPa, and the decompression treatment time was 1.5 3 hours; ③Carry out carbonization treatment at 800°C for 6 hours under the protection of inert gas to obtain block materials, which are crushed and classified by a crushing and classifying machine to obtain particles with a D50 particle size of 18.0 μm; ④at 3000°C Graphitization treatment was carried out for 4 hours to obtain an artificial graphite lithium-ion battery negative electrode material with a...

Embodiment 3

[0038] The preparation method of artificial graphite lithium-ion battery negative electrode material, it comprises the following steps: ① knead coal tar soft pitch and nano-silicon carbide at 80 ℃ in a pitch kneader for 2 hours at a weight ratio of 20:1 until the mixture is uniform Afterwards, carry out thermal polymerization reaction at 430°C for 2 hours; ②The product after the reaction is subjected to decompression treatment, the temperature of decompression treatment is 390°C, the vacuum degree of decompression treatment is -0.08MPa, and the decompression treatment time is 1 hour ; ③Carry out carbonization treatment at 1200°C for 4 hours under the protection of an inert gas to obtain block materials, which are crushed and classified by a crushing and classifying machine to obtain particles with a D50 particle size of 22.0 μm; ④at 3000°C The graphitization treatment was carried out for 8 hours to obtain the artificial graphite lithium ion battery negative electrode material w...

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Abstract

The invention discloses an artificial graphite lithium ion battery anode material and a preparation method thereof. The preparation method comprises the following steps: (1) mixing coal tar maltha with an additive according to a weight ratio of 5:1-50:1, well mixing, performing thermopolymerization reaction; (2) performing reduced pressure treatment of the reaction product; (3) performing carbonizing treatment, crushing, and grading treatment; (4) performing graphitization treatment. The additive is one or more of silicon, silica and silicon carbide. The artificial graphite lithium ion battery anode material has a high compaction density and first discharge capacity, and cells prepared by using the material as a lithium ion battery anode material have excellent comprehensive properties, stable structure, and good safety performance. The preparation method is simple and practical in process, wide in raw material source, and low in cost.

Description

technical field [0001] The invention relates to an artificial graphite lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] In recent years, electronic devices such as various mobile phones, notebook computers, digital video cameras, and portable appliances have been miniaturized and improved in performance. Lithium-ion batteries are attractive for their excellent performance in terms of high energy density, high working voltage, small size, light weight, no pollution, fast charging and discharging, and long cycle life. Theoretically LiC 6 The reversible lithium storage capacity can reach 372mAh / g, but the reversible lithium storage capacity of the commercialized artificial graphite negative electrode material is only about 330-340mAh / g, and the compaction density of the material is low. Go down, the first discharge capacity is low. [0003] The improvement of lithium-ion battery capacity mainly depends on the dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583
CPCH01M4/583H01M4/587H01M10/0525Y02E60/10
Inventor 李念民张殿浩王赫李杰李在峰朱从连
Owner SHANGHAI SHANSHAN TECH CO LTD
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