Lithium ion battery graphite anode material and preparation method thereof

A lithium-ion battery, graphite anode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor cycle performance of graphite anode materials, large pores inside graphite particles, poor charge and discharge performance, etc., and achieve a discharge platform. And the effect of high platform retention rate, excellent comprehensive performance, improved discharge capacity and cycle efficiency

Active Publication Date: 2016-07-06
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to overcome the low tap density of graphite negative electrode materials in the prior art, large internal pores of graphite particles, poor cycle performance of graphite negative electrode materials, and poor charge and discharge performance at high currents (3C to 5C). In order to provide a graphite negative electrode material for lithium-ion batteries and a preparation method thereof

Method used

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  • Lithium ion battery graphite anode material and preparation method thereof
  • Lithium ion battery graphite anode material and preparation method thereof
  • Lithium ion battery graphite anode material and preparation method thereof

Examples

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Embodiment 1

[0033] The petroleum asphalt is crushed to less than 0.1mm, and 20kg of spherical natural graphite (D50 is 19.1μm) and 5kg of asphalt powder are alternately added to the kneading pot under stirring, and kneading is carried out. The kneading temperature is 100°C. Press it into flakes in the machine, pulverize it, put it into a hot isostatic press, use argon gas medium, heat up and pressurize, keep it at 500 ° C for 1 hour at a calcination temperature and a pressure of 50 MPa, and then cool down naturally. Under the protection of nitrogen, carbonization treatment was carried out at a temperature of 1300° C. for 300 minutes, and then the reaction product was cooled to room temperature, and then graphitized at a high temperature (2800° C.) for 48 hours. And carry out crushing and classification, first coarse crushing, then fine crushing, adjust the frequency of the main machine of the fine crushing classifier to 15.35 Hz, set the external classification speed to 1000 rpm, and obtai...

Embodiment 2

[0036] The petroleum asphalt is crushed to less than 0.1mm, and 20kg of spherical natural graphite (D50 is 19.5μm) and 5kg of asphalt powder are alternately added to the kneading pot under stirring, and kneading is carried out. The kneading temperature is 120 ° C. Press it into flakes in the machine, pulverize it, put it into a hot isostatic press, use argon gas medium, heat up and pressurize, keep it at 500 ° C for 1 hour at a calcination temperature and a pressure of 50 MPa, and then cool down naturally. Under the protection of nitrogen, carbonization treatment was carried out at a temperature of 1100° C. for 360 minutes, and then the reaction product was cooled to room temperature, and then graphitized at a high temperature (3000° C.) for 48 hours. And carry out crushing and classification, first coarse crushing, then fine crushing, adjust the frequency of the main machine of the fine crushing classifier to 5.26 Hz, set the external classification speed to 1200 rpm, and obta...

Embodiment 3

[0038]The modified coal tar pitch is crushed to less than 0.1mm, and 12.5kg of spherical natural graphite (D50 is 20.1μm) and 12.5kg of asphalt powder are alternately added to the kneading pot under stirring, and kneading is carried out. The kneading temperature is 160°C. , pressed into flakes in a tablet machine, pulverized, put into a hot isostatic press for molding, using argon gas medium, heating and pressurizing, keeping at 500°C roasting temperature and 60MPa pressure for 1 hour, and then cooling down naturally. Under the protection of nitrogen, carbonization treatment was carried out at a temperature of 1500° C. for 180 minutes, and then the reaction product was cooled to room temperature, and then graphitized at a high temperature (3000° C.) for 24 hours. And carry out crushing and classification, first coarse crushing, then fine crushing, adjust the frequency of the main machine of the fine crushing classifier to 54Hz, set the external classification speed to 1300 rpm,...

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Abstract

The invention discloses a lithium ion battery graphite anode material and a preparation method thereof. The preparation method includes the steps of: 1) heating and kneading a mixture of natural graphite and an adhesive; 2) performing hot isostatic pressing moulding at 500-1000 DEG C under 50-100 MPa; 3) performing carbonization; 4) performing graphitization; and 5) crushing and classifying a product. The lithium ion battery graphite anode material has high tap density, large discharge capacity and good cycle performance, is reduced in internal pores of graphite particles, reduces expansion and is improved in cycle performance.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery graphite negative electrode material and a preparation method thereof. Background technique [0002] In recent years, along with the miniaturization of electronic devices, there has been an increasing demand for high-capacity, low-expansion secondary batteries. 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 improving battery capacity, as the requirements for battery performance increase, it is necessary to further reduce the expansion of battery cells while increasing battery capacity. [0003] As negative electrode materials for lithium ion batteries, granular materials such as metals or graphite have been studied. With the increase of battery capacity, it is especially necessary to use higher tap density (such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H01M4/587
CPCY02E60/10
Inventor 谢秋生罗才坤张鹏昌仲林江伟伟
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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