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Graphite negative material of lithium ion battery and producing method thereof

A lithium-ion battery and graphite negative electrode technology, applied in electrode manufacturing, battery electrodes, circuits, etc., to achieve the effects of improving compatibility, high reversible electrochemical capacity, and preventing co-embedding

Inactive Publication Date: 2005-02-23
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a lithium-ion battery graphite negative electrode material and its preparation method. The technical problem to be solved is to enhance the structural firmness of the graphite matrix and the protective film, prevent the co-embedding of solvents, and improve the reversible capacity and cycle stability of the negative electrode material. sex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1 In a 5L container, add 1L of CS 2 , then add 0.1kg of impregnated asphalt, stir until the asphalt is completely dissolved, then slowly add 1kg of spherical natural graphite SG under stirring conditions, the tap density of spherical natural graphite is 0.96g / c.c, the particle size D50 = 17.6μm, and the specific surface area is 6.4m 2 / g, after adding graphite for 1 hour, raise the temperature to 65°C and keep it for 1 hour to evaporate CS 2 Solvent, pitch-coated spherical natural graphite in an inert atmosphere nitrogen N 2 , heat up to 1050°C, keep the temperature for 2 hours, cool down to below 100°C, take it out, grind it, and sieve it, then it can be used as the negative electrode material of lithium-ion battery

Embodiment 2

[0019] Example 2 In this example, molten pitch is used to coat spherical natural graphite, which is produced in Qidong Jinsong Machinery Manufacturing Co., Ltd., and the model is: JSL158 coulter type mixer, adding pitch with low softness ratio, heating it to melt, Then add 10 times the amount of spherical natural graphite, fully stir under the condition of continuous heating, and remove the volatile components, take out the pitch-coated natural graphite after 2 hours, and the spherical natural graphite coated with pitch is in an inert atmosphere nitrogen N 2 , heat up to 1050°C, keep the temperature for 2 hours, cool down to below 100°C, take it out, grind it, and sieve it, then it can be used as the negative electrode material of lithium-ion battery

Embodiment 3

[0020] Example 3 In this example, high softening point asphalt powder and spherical natural graphite are used for solid-phase mixing and bonding. First, the high softening point petroleum asphalt is crushed to below 3 μ, and the mass ratio of asphalt to spherical natural graphite is 1:10. Fully mix and After bonding, the pitch-coated spherical natural graphite was placed in an inert atmosphere of nitrogen N 2 After being treated at a high temperature of 1050°C for 2 hours, the temperature is lowered to below 100°C, taken out, crushed, and sieved to be used as a negative electrode material for lithium-ion batteries

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Abstract

To improve the stability of the graphite base body and the protecting film, the technical method is applied. The graphite negative material of the lithium ion battery is composed of the graphite and the shell covering the graphite. The shell is the carbon coverage with low crystallization disorderly layer structure. The producing procedure is as below: (1) Cover the bitumen onto the surface of the black lead particle. (2) Process the covered bitumen with heating processing. Compared with existed technology, the processed bitumen possesses the property of strong strong ability for combination and cycling stability with low cost.

Description

technical field [0001] The invention relates to a battery electrode material and a preparation method, in particular to a lithium ion battery graphite negative electrode material and a preparation method. Background technique [0002] The currently used carbon anode materials for lithium-ion batteries mainly include soft carbon, hard carbon and graphite. Among them, graphite anode materials have high reversible capacity, with a theoretical capacity of 372mAh / g, stable discharge platform, and low price. People's attention is the focus of current development, but it also has disadvantages as a negative electrode material, such as low tap density, generally not more than 0.8g / c.c, which reduces the volume capacity density of the battery. Graphite particles prepared by traditional processes, Most of them have a sheet-like structure, which is not conducive to improving its stacking and tap density, but also in the prepared battery pole piece, the C-axis of graphite is perpendicul...

Claims

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Application Information

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IPC IPC(8): C01B31/02H01M4/38
CPCY02E60/10
Inventor 于作龙岳敏许晓落裴素文
Owner BTR NEW MATERIAL GRP CO LTD
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