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Spherical porous artificial graphite anode material and preparation method of same

An artificial graphite negative electrode and artificial graphite technology, applied in the field of electrochemistry, can solve the problems of poor cycle stability of negative electrode materials, poor electrolyte compatibility, poor high and low temperature performance, etc., achieve high-rate cycle performance improvement, low preparation cost, Effect of Improving Magnification Performance

Active Publication Date: 2016-01-13
CHINA THREE GORGES UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The negative electrode material obtained by natural graphite through spheroidization, purification, coating, and high-temperature sintering has a higher degree of graphitization than artificial graphite negative electrode, and has the advantages of good processing performance and high discharge specific capacity. However, when natural graphite is processed as negative electrode material The utilization rate of graphite is low (<40%), and the negative electrode material has disadvantages such as poor cycle stability, poor high and low temperature performance, poor compatibility with electrolyte, and poor rate performance. The biggest bottleneck in electric vehicles
At present, the anode material of commercial lithium-ion batteries is mainly artificial graphite, which has the advantages of good cycle stability, high particle sphericity, excellent high and low temperature performance, and good safety performance, but it also has low discharge specific capacity and low production cost. advanced defects

Method used

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  • Spherical porous artificial graphite anode material and preparation method of same
  • Spherical porous artificial graphite anode material and preparation method of same
  • Spherical porous artificial graphite anode material and preparation method of same

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Embodiment one : Add the anthracite coal powder obtained by mechanical ball milling into 2-5mol / L mixed acid (hydrochloric acid / nitric acid equimolar ratio), heat to 60-80°C, stir for 3-5 hours, filter and wash until the filtrate is neutral. The filtered anthracite is mixed with water, defoamer, sucrose (5%), polyvinyl alcohol or carboxymethyl cellulose sodium salt (2-5%), and planetary ball mill for 6-8 hours to obtain slurry (solid content 30% ), the slurry is sintered in a graphitization furnace at high temperature (2600°C) for 5-8 hours after spray granulation, and sieved (300 mesh) after cooling with the furnace. The electrode preparation method, battery assembly and test conditions are the same as those of the comparative example. The first charge (delithiation) capacity is 342.3mAhg -1 , the coulombic efficiency is 91.4%, and the charging (lithium intercalation) capacity is 325.4mAhg after 100 cycles -1 , The capacity retention rate is 95%. It shows that aft...

Embodiment 2

[0027] Embodiment two : Add the anthracite coal powder obtained by mechanical ball milling into 2-5mol / L mixed acid (hydrochloric acid / nitric acid equimolar ratio), heat to 60-80°C, stir for 3-5 hours, filter and wash until the filtrate is neutral. The filtered anthracite is mixed with water, defoamer, sucrose (8%), polyvinyl alcohol or sodium carboxymethyl cellulose (2-5%), and planetary ball milling for 6-8 hours to obtain a slurry (solid content 40% ), the slurry is sintered in a graphitization furnace at high temperature (2800°C) for 5-8 hours after spray granulation, and sieved (300 mesh) after cooling with the furnace. The electrode preparation method, battery assembly and test conditions are the same as those of the comparative example. The first charge (delithiation) capacity is 362.6mAhg -1 , the coulombic efficiency is 92.4%, and the charging (lithium intercalation) capacity after 100 cycles is 365.8mAhg -1 , The capacity retention rate is 101%. It shows that in...

Embodiment 3

[0028] Embodiment Three : Add the anthracite coal powder obtained by mechanical ball milling into 2-5mol / L mixed acid (hydrochloric acid / nitric acid equimolar ratio), heat to 60-80°C, stir for 3-5 hours, filter and wash until the filtrate is neutral. The filtered anthracite is mixed with ethanol, defoamer, citric acid (10%), and polyvinyl butyral (2-5%), and the planetary ball mill is used for 6-8 hours to obtain a slurry (solid content 45%). After spray granulation, sinter at high temperature (2900°C) for 5-8 hours in a graphitization furnace, and sieve (300 mesh) after cooling with the furnace. The electrode preparation method, battery assembly and test conditions are the same as those of the comparative example. The first charge (delithiation) capacity is 372.3mAhg -1 , the coulombic efficiency is 92.6%, and the charging (lithium intercalation) capacity is 391.2mAhg after 100 cycles -1 , The capacity retention rate is 105%. The material capacity exceeds the capacity li...

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Abstract

The invention provides a spherical porous artificial graphite anode material, which is in the form of spherical particles formed by graphite nano crystals being less in 0.5 [mu]m in size in a binding manner. The spherical particles is 5-15 [mu]m in diameter and has large quantity of pores distributed therein. A preparation method of the artificial graphite includes the steps of ball-milling anthracite ore, removing impurities, performing dispersion and coating and performing high-temperature thermal treatment. The artificial graphite can reach 99.99% in purity and can reach 390 mAh / g in 0.5C reversible capacity by means of regulation of graphitization degree and introduction of coating carbon having a special structure. The porous spherical structure is formed by large quantity of the graphite nano crystals, so that the porous artificial graphite has a large specific surface area and is beneficial to permeation of electrolytes into the spherical particles. The anode material can be commercially popularized.

Description

technical field [0001] The invention relates to a porous spherical artificial graphite negative electrode material for a lithium secondary battery and a preparation method thereof, belonging to the field of electrochemistry. Background technique [0002] Since Sony applied lithium-ion batteries to the commercial market, lithium-ion batteries have been widely used due to their high specific capacity, high energy density, high operating voltage and long cycle life. The development of lithium-ion batteries largely depends on the development of high-performance positive and negative electrode materials. Searching for anode materials with superior performance can improve the performance of lithium-ion batteries to a certain extent. [0003] At present, commercial lithium-ion battery anode materials mainly use carbon materials, and there are two kinds of natural graphite anodes and artificial graphite anodes. The negative electrode material obtained by natural graphite through s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H01M4/587H01M10/0525
CPCH01M4/133H01M4/1393H01M4/583H01M10/0525Y02E60/10
Inventor 杨学林吴璇郑安华张斐胡东亮
Owner CHINA THREE GORGES UNIV
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