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Soft-carbon composite cathode material of lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, which can be used in battery electrodes, secondary batteries, circuits, etc., and can solve problems such as potential safety hazards

Active Publication Date: 2014-01-08
JIXI BTR GRAPHITE IND PARK CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphite anode materials have been widely used in the field of lithium-ion batteries due to their high initial charge-discharge efficiency and high energy density. certain security risks

Method used

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  • Soft-carbon composite cathode material of lithium ion battery and preparation method thereof
  • Soft-carbon composite cathode material of lithium ion battery and preparation method thereof
  • Soft-carbon composite cathode material of lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] (1) Add 3g of ferric nitrate and 2g of cobalt nitrate to 100g of coal tar with a softening point of 90°C at room temperature, and then add D 50 = 20g of natural graphite with a diameter of 3μm, under stirring at 80r / min, heat up to 100°C at a rate of 12°C / min, keep the temperature constant for 0.5h, then raise the rate to 300°C at a rate of 8°C / min, keep the temperature constant for 5h, and let it cool down naturally to room temperature, a mixture containing mesophase pitch and graphite was obtained.

[0082] (2) Raise the temperature at a rate of 5°C / min to 400°C, hold the temperature for 6 hours, and cool down to room temperature naturally to obtain a primary product containing spherical mesophase pitch and graphite.

[0083] (3) Mix the primary product containing spherical mesophase pitch and graphite with pyridine at a mass ratio of 1:3, heat it to 160°C at a heating rate of 6°C / min under stirring at a speed of 60r / min, and keep it for 1h. Suction filtration, extra...

Embodiment 2

[0086] (1) Add 0.1g of nickel acetate to 100g of petroleum pitch with a softening point of 45°C at room temperature, and then add D 50 =8μm artificial graphite 10g, under stirring at 70r / min, heat up to 120°C at a rate of 15°C / min, keep the temperature constant for 12 hours, then heat up to 200°C at a rate of 20°C / min, hold the temperature for 2 hours, and then drop to At room temperature, a mixture containing mesophase pitch and graphite was obtained.

[0087] (2) Raise the temperature to 350°C at a rate of 0.1°C / min, keep the temperature constant for 8 hours, and cool down to room temperature naturally to obtain a primary product containing spherical mesophase pitch and graphite.

[0088](3) Mix the primary product containing spherical mesophase pitch and graphite with quinoline at a mass ratio of 1:1, heat it to 100°C at a heating rate of 3°C / min under stirring at a speed of 70r / min, and keep it warm for 2h , filtered with suction, extracted with pyridine, washed the prima...

Embodiment 3

[0091] (1) Add 5g of aluminum isopropoxide and 5g of ferric bromide to 100g of petroleum industrial heavy oil with a softening point of 110°C at room temperature, and then add D 50 =15μm artificial graphite 10g and D 50 =15μm natural graphite 50g, under stirring at 60r / min, heat up to 160°C at a rate of 20°C / min, keep the temperature constant for 20 hours, then heat up to 280°C at a rate of 3°C / min, hold the temperature for 1 hour, and cool down naturally to At room temperature, a mixture containing mesophase pitch and graphite was obtained.

[0092] (2) Raise the temperature to 380°C at a rate of 10°C / min, keep the temperature constant for 10 hours, and cool down to room temperature naturally to obtain a primary product containing spherical mesophase pitch and graphite.

[0093] (3) Mix the primary product containing spherical mesophase pitch and graphite with toluene at a mass ratio of 1:2, heat it to 130°C at a heating rate of 20°C / min under stirring at a speed of 80r / min,...

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Abstract

The invention discloses a soft-carbon composite cathode material of a lithium ion battery and a preparation method of the soft-carbon composite cathode material, aiming to increase the first charge and discharge efficiency and energy density of the soft-carbon cathode material. The composite material is prepared from a soft-carbon material and graphite and simultaneously has an irregular-layer structure and a layer structure, and the mass ratio of the precursor of the soft-carbon material to the graphite is (90-40):(10-60). The preparation method comprises the following steps: adding the graphite into pitch, catalyzing, gathering, and carbonizing; or catalyzing and gathering the pitch to be compounded with the graphite, and carbonizing; or catalyzing and gathering the pitch, and compounding the treated pitch with the graphite after carbonizing. Compared with the prior art, the compaction density of the soft-carbon composite cathode material of the lithium ion battery is larger than 1.5g / cm<3>, the first charge and discharge coulombic-efficiency achieves more than 90 percent, and the capacity retention ratio of circulating for 800 times is larger than 95 percent; the soft-carbon composite cathode material of the lithium ion battery has good capacity of rapid deinsertion and insertion of lithium, and the 30C / 1C capacity retention ratio is larger than 95 percent.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material and a preparation method thereof, in particular to a lithium ion battery composite negative electrode material and a preparation method thereof. Background technique [0002] Soft carbon anode materials have an irregular turbostratic structure, so they have excellent fast charge and discharge performance, cycle performance and safety performance. In recent years, a series of researches have been carried out on this kind of materials at home and abroad. Chinese Invention Patent Publication No. CN102428595A discloses a soft carbon negative electrode material obtained by firing raw coke and roasted coke in different proportions; The soft carbon negative electrode material obtained after firing; Chinese invention patent publication number CN102640330A discloses a soft carbon negative electrode material obtained by firing after adding a binder polyimide resin on the basis of the rese...

Claims

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Application Information

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IPC IPC(8): H01M4/36
CPCY02E60/12H01M4/366H01M4/583H01M10/0525Y02E60/10
Inventor 安红芳汪福明岳敏黄友元任建国
Owner JIXI BTR GRAPHITE IND PARK CO LTD
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