Composite hard carbon negative electrode material, and preparation method and application thereof

A negative electrode material, hard carbon technology, applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of difficult commercialization, complicated preparation process, high manufacturing cost, etc., and achieve high-current charge and discharge performance and good cycle performance. Good chemical performance and good adaptability

Active Publication Date: 2013-09-18
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 provide a composite hard carbon negative electrode material and its preparation method and use in order to overcome the defects of complex preparation process, high manufacturing cost and difficulty in commercialization of existing hard carbon negative electrode materials

Method used

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  • Composite hard carbon negative electrode material, and preparation method and application thereof
  • Composite hard carbon negative electrode material, and preparation method and application thereof
  • Composite hard carbon negative electrode material, and preparation method and application thereof

Examples

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Embodiment 1

[0034] ①Coal tar pitch and benzaldehyde cross-linking agent were cross-linked and polymerized at 120°C for 2 hours at a mass ratio of 2:1 to obtain a cross-linked body; ②The cross-linked body was cured at 300°C for 4 hours in an inert atmosphere, and then Pulverized by a pulverizer at a speed of 1000 rpm, passed through a 60-mesh sieve, and pre-carbonized at 600 °C for 16 hours in an inert atmosphere to obtain a carbon precursor; ③ Pulverized by a pulverizer at a speed of 2000 rpm, the frequency Classified at 105Hz to obtain carbon precursor particles with a volume average particle diameter D50 of 8.3 μm, and carbonized particles were obtained by carbonization and heat treatment at 1100°C for 18 hours in an inert atmosphere; ④ carbonized particles were mixed with natural graphite at a mass ratio of 4:1 for 1.5 hours , to obtain a composite hard carbon negative electrode material; wherein, the volume average particle diameter D50 of the natural graphite is 17 μm, and the tap den...

Embodiment 2

[0036]① Coal tar pitch and benzaldehyde cross-linking agent were subjected to cross-linking polymerization reaction at 120°C for 2 hours at a mass ratio of 5:2 to obtain a cross-linked body; ②The cross-linked body was cured at 500°C for 2 hours in an inert atmosphere, and then Pulverized by a pulverizer at a speed of 800 rpm, passed through a 60-mesh sieve, and pre-carbonized at 600°C for 20 hours in an inert atmosphere to obtain a carbon precursor; ③ Pulverized by a pulverizer at a speed of 5000 rpm 90Hz classification to obtain carbon precursor particles with a volume average particle diameter D50 of 12.9 μm, and carbonized particles at a high temperature of 1100°C for 24 hours in an inert atmosphere to obtain carbonized particles; ④ Mix carbonized particles and natural graphite at a mass ratio of 7:3 for 3 hours , to obtain a composite hard carbon negative electrode material; wherein, the volume average particle diameter D50 of the natural graphite is 23 μm, and the tap dens...

Embodiment 3

[0038] ①Petroleum pitch and benzaldehyde cross-linking agent were cross-linked and polymerized at 100°C for 4 hours at a mass ratio of 10:3 to obtain a cross-linked body; ②The cross-linked body was cured at 500°C for 2 hours in an inert atmosphere, and then subjected to Pulverize with a pulverizer at 1000 rpm, pass through a 60-mesh sieve, and pre-carbonize at 650°C for 8 hours in an inert atmosphere to obtain a carbon precursor; ③ Pulverize with a pulverizer at a speed of 8000 rpm. Classification to obtain carbon precursor particles with a volume average particle diameter D50 of 8.3 μm, and carbonization and heat treatment at 800 ° C for 24 hours in an inert atmosphere; ④ Mix carbonized particles and natural graphite at a mass ratio of 1:1 for 2 hours to obtain a composite Hard carbon negative electrode material; wherein, the volume average particle diameter D50 of the natural graphite is 16 μm, and the tap density is 1.06 g / cm 3 , specific surface area 2.3m 2 / g, true densi...

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Abstract

The invention discloses a preparation method for a composite hard carbon negative electrode material. The preparation method comprises the following steps: 1) subjecting asphalt to cross-linking polymerization so as to obtain a cross-linked polymer; 2) successively subjecting the cross-linked polymer to curing, crushing, grading and precarbonization low temperature treatment so as to obtain a carbon precursor; 3) crushing and grading the carbon precursor and then carrying out high temperature carbonizing treatment so as to obtain a carbonized particle; and 4) uniformly mixing the carbonized particle with natural graphite according to a mass ratio of 2: 3 to 4: 1. The preparation method provided by the invention has the advantages of simple and easily practicable process, wide sources of raw materials and low cost. The invention further discloses the composite hard carbon negative electrode material and application thereof. The composite hard carbon negative electrode material has initial discharge capacity of more than 300 mAh / g, initial charge and discharge efficiency of more than 85%, good heavy-current charge and discharge performance, good electrochemical performance, good cycle performance, good heavy-current charge and discharge performance, good security, good adaptability to an electrolyte and other additives and stable properties, and different batches of the prepared material barely show a difference.

Description

technical field [0001] The present invention relates to a hard carbon negative electrode material and its preparation method and application, in particular to a preparation method of a hard carbon negative electrode material composited with natural graphite, the composite hard carbon negative electrode material prepared by the method and its use as lithium ion secondary The application of secondary battery negative electrode material. Background technique [0002] 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCY02E60/10
Inventor 谢秋生陈志明薄维通杜旭
Owner SHANGHAI SHANSHAN TECH CO LTD
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