Hard-carbon negative electrode material for lithium ion secondary battery and preparation method thereof

A technology for secondary batteries and negative electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of high cost, difficult industrialized production, and complicated preparation methods, and achieves low cost, stable product properties, and simple and easy process. Effect

Active Publication Date: 2013-09-18
NINGBO SHANSHAN NEW MATERIAL TECH +1
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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 complicated preparation method, high cost and difficulty in industrialized production of existing hard carbon negative electrode materials, and to provide a hard carbon negative electrode material for lithium-ion secondary batteries and its preparation method

Method used

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  • Hard-carbon negative electrode material for lithium ion secondary battery and preparation method thereof
  • Hard-carbon negative electrode material for lithium ion secondary battery and preparation method thereof
  • Hard-carbon negative electrode material for lithium ion secondary battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] ①Put refined anthracene and benzaldehyde into the reaction kettle with a mass ratio of 2:1 under stirring, and carry out cross-linking polymerization reaction at 180°C for 2 hours; After 4 hours, cool down to room temperature and discharge, then pulverize with a pulverizer at a speed of 1000 rpm, pass through a 60-mesh sieve, take the under-sieve and put it into a well-type carbonization furnace, and carry out pre-carbonization treatment at 700 °C under an inert atmosphere for 16 3 hours, down to room temperature; ③ pulverize with a pulverizer at a speed of 2000 rpm, pass through a 60-mesh sieve, take the sieve and heat-treat at 1000 °C for 18 hours in a high-temperature carbonization furnace of a pusher kiln under an inert atmosphere; ④ pulverize by airflow Classifier pulverization and classification are carried out with compressed air pressure of 8 MPa, feed frequency of 21 Hz and classifier frequency of 105 Hz to obtain a hard carbon negative electrode material with a...

Embodiment 2

[0036]①Add refined anthracene and formaldehyde into the reaction kettle with stirring at a ratio of 5:2 by mass, and carry out cross-linking polymerization reaction at 100°C for 4 hours; hours, lowered to room temperature and discharged, and then pulverized by a pulverizer at a speed of 800 rpm, passed through a 60-mesh sieve, and the undersieve was taken into a well-type carbonization furnace, and pre-carbonized at 600°C for 24 hours under an inert atmosphere. , down to room temperature; ③ crush with a pulverizer at a speed of 5000 rpm, pass through a 60-mesh sieve, and take the sieve and heat-treat at 1500 °C for 12 hours in a high-temperature carbonization furnace of a pusher kiln under an inert atmosphere; ④ pass through a jet crushing classifier Pulverization and classification are carried out with compressed air pressure of 9 MPa, feed frequency of 25 Hz and classifier frequency of 90 Hz to obtain a hard carbon negative electrode material with a volume average particle di...

Embodiment 3

[0038] ①Add refined anthracene and paraformaldehyde into the reaction kettle with a mass ratio of 10:3 and mix them under stirring, and carry out cross-linking polymerization reaction at 100°C for 4 hours; ②After the reaction is completed, it will not melt at 600°C under an inert atmosphere Treat for 2 hours, cool down to room temperature and discharge, then pulverize with a pulverizer at a speed of 1000 rpm, pass through a 60-mesh sieve, take the undersieve and put it into a well-type carbonization furnace, and carry out pre-carbonization treatment at 750°C under an inert atmosphere 8 hours, down to room temperature; ③Use a pulverizer to crush at a speed of 8000 rpm, pass through a 60-mesh sieve, and take the under-sieve and heat-treat at 1100°C for 24 hours in a high-temperature carbonization furnace of a pusher kiln under an inert atmosphere; ④Through air flow Grinding and classifying machine crushing and grading are carried out with a compressed air pressure of 9 MPa, a fee...

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Abstract

The invention discloses a hard-carbon negative electrode material for a lithium ion secondary battery and a preparation method thereof. The preparation method comprises the following steps: (1) subjecting an aromatic compound and a cross-linking agent to cross-linking and polymerization so as to obtain a cross-linked polymer; (2) successively subjecting the cross-linked polymer to curing treatment, crushing and grading so as to obtain a particle with a particle size of less than 250 mu m and carrying out pre-carbonization treatment; (3) carrying out crushing and grading until the particle has a particle size of less than 250 mu m and then carrying out carbonization treatment; and (4) carrying out crushing and grading until the particle has a volume mean particle size D50 of 2 to 30 mu m; wherein the aromatic compound is C12-C16 aromatic hydrocarbon and/or heterocyclic aromatic hydrocarbon. The preparation method provided by the invention has the advantages of easiness, feasibility, wide sources of raw materials and low cost. The hard-carbon negative electrode material prepared by using the method has good heavy-current charge and discharge performance, good cycle performance, good security, good stability and good adaptability to an electrolyte and other additives; and a lithium ion battery product prepared from the hard-carbon negative electrode material has stable properties, and different batches of the product barely show a difference.

Description

technical field [0001] The invention relates to a hard carbon negative electrode material for a lithium ion secondary battery and a preparation method thereof. Background technique [0002] In the 21st century, the oil reserves on the earth are increasingly depleted, and the greenhouse effect of automobile exhaust emissions on the environment. Lithium-ion batteries have the advantages of small size and light weight. In order to effectively utilize these advantages of lithium-ion batteries, researchers are actively developing lithium-ion batteries for electric vehicles in recent years. Electric vehicles generally include electric vehicles (EVs) driven only by electric motors and hybrid electric vehicles (HEVs) driven by a combination of engines and electric motors. Among them, HEVs are characterized by economy and low fuel consumption. [0003] In this way, lithium-ion secondary batteries for HEVs are required to have characteristics different from those of lithium-ion batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCY02E60/10
Inventor 谢秋生方郁野杜辉玉陈志明薄维通
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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