A kind of lithium ion battery natural graphite negative electrode material and preparation method thereof

A lithium-ion battery and natural graphite technology, which is applied in the field of lithium-ion battery natural graphite negative electrode materials and its preparation, can solve the problems of low discharge capacity and poor cycle performance, and achieve good charge and discharge performance, high retention rate, and electrochemical performance. Good results

Active Publication Date: 2017-07-21
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of low discharge capacity and poor cycle performance of existing graphite negative electrode materials, and provide a natural graphite negative electrode material for lithium ion batteries and its preparation method

Method used

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  • A kind of lithium ion battery natural graphite negative electrode material and preparation method thereof
  • A kind of lithium ion battery natural graphite negative electrode material and preparation method thereof
  • A kind of lithium ion battery natural graphite negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] ①Pretreat 20kg of natural graphite with a volume average particle size D50 of 19.3μm at 500°C for 4 hours; ②Put 20kg of natural graphite with a volume average particle ) 0.8kg into a cantilever double-helix conical mixer and mixed for 2 hours to obtain a mixture; under stirring, alternately add 20.8kg of the mixture and 4kg of petroleum pitch into the kneading pot, and knead and stir at 100 ° C for 1.5 hours; ③ in nitrogen Under the protection of carbonization at 1100°C for 2 hours, the reaction product was cooled to room temperature at 5°C, and then subjected to high-temperature catalytic graphitization at 2800°C for 36 hours; The lower matter was classified by an airflow classifier, and the frequency of the classification wheel was 48 Hz to obtain a lithium-ion battery graphite negative electrode material with a particle volume average particle diameter D50 of 20.6 μm. The measured half-battery capacity is 362.5mAh / g, and the first charge and discharge efficiency is 9...

Embodiment 2

[0039] ①Pre-treat 20kg of natural graphite with a volume average particle size D50 of 17.8μm at 600°C for 5 hours; ②Put 20kg of natural graphite with a volume average particle size D50 of 17.8μm after treatment. Graphitization catalyst (SiC) Add 0.8kg into the cantilever double-helix conical mixer and mix for 2 hours to obtain the mixture; alternately add 20kg of the mixture and 3kg of petroleum pitch into the kneading pot under stirring, and knead at 160°C for 1 hour; ③Under the protection of nitrogen , and carbonized at a temperature of 800 ° C for 6 hours, then cooled the reaction product to room temperature 30 ° C, and then carried out a high-temperature catalytic graphitization treatment at 3000 ° C for 48 hours; Classification was carried out by using an air classifier, and the frequency of the classifying wheel was 35 Hz to obtain a lithium ion battery graphite negative electrode material with a particle volume average particle diameter D50 of 18.4 μm. The measured half...

Embodiment 3

[0041] ①Pretreat 20kg of natural graphite with a volume average particle size D50 of 12.1μm at 500°C for 4 hours; ) 1.2kg was added to a cantilever double-helix conical mixer and mixed for 3 hours to obtain a mixture; under stirring, 21.2kg of the mixture and 4kg of petroleum asphalt were alternately added to the kneading pot, and kneading was carried out at 100°C for 1.5 hours; Under protection, carbonization treatment was carried out at a temperature of 1500°C for 3 hours, and then the reaction product was cooled to room temperature at 26°C, and then subjected to a high-temperature catalytic graphitization treatment at 3200°C for 48 hours; The lower matter was classified by an airflow classifier, and the frequency of the classification wheel was 45 Hz to obtain a lithium-ion battery graphite negative electrode material with a particle volume average particle diameter D50 of 13.2 μm. The measured half-battery capacity is 365.2mAh / g, and the first charge and discharge efficien...

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Abstract

The invention discloses a preparation method and a natural graphite negative electrode material of a lithium ion battery prepared by the method. The method comprises the following steps: (1) preprocessing spherical natural graphite at high temperature of 500-600 DEG C for 4-6 hours; (2) uniformly mixing the spherical natural graphite in the step (1), a graphitized catalyst and petroleum asphalt to obtain a mixture; (3) carbonizing the mixture in the step (2), cooling, and performing high-temperature catalytic graphitization treatment; and (4) grading. The preparation method of the graphite negative electrode material is simple and feasible and is suitable for industrialization production. The graphite negative electrode material is large in discharge capacity and good in circulating performance; a button battery manufactured by the graphite negative electrode material is excellent in comprehensive performance.

Description

technical field [0001] The invention relates to a lithium ion battery natural graphite negative electrode material and a preparation method thereof. Background technique [0002] With the miniaturization and popularization of electronic devices, a secondary battery with a larger capacity is increasingly required. Of particular interest are lithium-ion batteries, which have a higher energy density than nickel-cadmium or nickel-metal hydride batteries. Although extensive research has been conducted on increasing the battery capacity, further increases in battery capacity are required as the requirements for battery performance increase. [0003] Natural graphite has a high capacitance (>350mAh / g), but has the disadvantage of unstable structure. When the extrusion pressure is increased to obtain higher electrode density, the graphite anode particles are easily oriented parallel to the current collector, resulting in a consistent orientation throughout the electrode, and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583
CPCH01M4/133H01M4/583H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 杜旭丁晓阳乔永民吴志红李辉李杰李虹
Owner SHANGHAI SHANSHAN TECH CO LTD
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