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Novel cathode material for lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied to battery electrodes, circuits, electrical components, etc., can solve the problems of low initial discharge efficiency, poor cycle performance, and unstable quality, and achieve high initial coulombic efficiency and cycle efficiency. Excellent discharge performance and reduced production cost

Active Publication Date: 2012-06-27
湖北联投恒达石墨有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Artificial carbon materials include pitch mesocarbon microspheres, resin carbon, and artificial graphite materials as negative electrode materials. The advantages are stable performance, high cycle efficiency, and fast charge and discharge. The disadvantages are small capacity and high cost; natural graphite is divided into flake graphite and Microcrystalline graphite, as a negative electrode material, has the advantage of high capacity, but the disadvantages are low initial discharge efficiency, poor cycle performance, and poor rapid charge and discharge ability
[0004] The current anode material mixed with natural graphite and artificial carbon material reflects some combination advantages, but there is also the problem of unstable quality; in addition, a large number of by-products are produced during the spheroidization process of natural flake graphite, which brings difficulties to the manufacture of anode materials. huge cost pressure

Method used

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preparation example Construction

[0026] A preparation method of a novel lithium-ion battery negative electrode material, specifically the following steps:

[0027] 1) Petroleum coke is ground into a 200-mesh powder by Raymond mill, and the natural graphite and petroleum coke are respectively deironed by a magnetic separator, sieved, and the sieved material is dry-blended in a double Z-type kneader for 15-20 minutes The mixed powder is obtained, and the powder is heated to dissolve the asphalt in the tar, and the dissolved asphalt is kneaded with the mixed powder at a temperature 5-10°C higher than the softening point of the asphalt until the material becomes a paste;

[0028] 2) Roll the kneaded material into flakes, pulverize after the flakes are cooled, sieve, take the sieved material, mix with a double-helix conical mixer, extrude or press to form;

[0029] 3) The material obtained in the previous step is carbonized at a temperature of 1150°C;

[0030] 4) Graphitization is carried out at a temperature not...

Embodiment 1

[0033] Embodiment 1: In parts by weight, get natural graphite 35, petroleum coke 25, pitch 15, carry out mixing, kneading, flake, pulverize, molding, carbonization, graphitization, spheroidization, obtain novel lithium ion battery negative electrode material.

Embodiment 2

[0034] Embodiment 2: In parts by weight, get natural graphite 35, petroleum coke 45, pitch 25, carry out mixing, kneading, flake, pulverize, molding, carbonization, graphitization, spheroidization, obtain novel lithium ion battery negative electrode material.

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Abstract

The invention provides a novel cathode material for a lithium ion battery and a preparation method thereof. The material is compounded by natural graphite, oil coke and pitch. The compound process comprises mixing, pinching, rolling sheets, smashing, forming, carbonizing, graphitizing, spherizing and the like. By weight, the natural graphite is 35 to 55 parts, the oil coke is 25 to 45 parts, and the pitch is 15 to 25 parts. Compared with the prior art, the cathode material has the advantages of synthetic graphite and natural graphite and is large in volume, high in first efficiency and circulation efficiency and excellent in charging and discharging performance. Furthermore, the natural graphite adopts secondary products discharged and collected by a dust remover after natural crystalline flake graphite is smashed in spherical mode. Thus, secondary products are reasonably used, and production cost is remarkably reduced.

Description

technical field [0001] The invention relates to a manufacturing method of a lithium ion battery negative electrode material, in particular to a novel lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] There are three main types of carbon anode materials for lithium-ion batteries: one is pitch mesocarbon microspheres, resin carbon, etc., the other is artificial graphite materials, and the other is natural graphite-coated carbon materials. [0003] Artificial graphite and natural graphite are used as negative electrode materials and must be spheroidized. Artificial carbon materials include pitch mesocarbon microspheres, resin carbon, and artificial graphite materials as negative electrode materials. The advantages are stable performance, high cycle efficiency, and fast charge and discharge. The disadvantages are small capacity and high cost; natural graphite is divided into flake graphite and Microcrystalline graphi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCY02E60/12Y02E60/10
Inventor 付云峰
Owner 湖北联投恒达石墨有限公司
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