Graphite cathode material of lithium ion battery 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 and low discharge capacity, and achieve good charge and discharge performance, good electrochemical performance, and good adaptability Effect

Active Publication Date: 2013-07-24
CHENZHOU SHANSHAN NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 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 graphite negative electrode material for lithium ion batteries and its preparation method

Method used

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  • Graphite cathode material of lithium ion battery and preparation method thereof
  • Graphite cathode material of lithium ion battery and preparation method thereof
  • Graphite cathode material of lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037]①Place natural graphite with a volume average particle size of 19.3μm in a heating device, and heat it at 400°C for 3 hours in a nitrogen atmosphere for heating pretreatment; ②Put 20kg of treated natural graphite and graphitization catalyst (SiC) Add 0.8kg into the cantilever double-helix conical mixer and mix for 2 hours to obtain the mixture; ③Alternately add 20.8kg of the mixture and 10kg of petroleum pitch into the kneading pot under stirring, and knead at 160°C for 1 hour. After the kneading is completed, Compress it into 2~5mm flakes in a tablet machine, crush it into a powder with a particle size of less than 0.1mm, and briquette it into a cylindrical shape; ④Under the protection of nitrogen, carbonize at a temperature of 1100°C for 2 hours, and then react The product is cooled to room temperature, and then subjected to high-temperature catalytic graphitization treatment at 2800°C for 36 hours; ⑤ Use a jaw crusher for coarse crushing, and the particle size is contr...

Embodiment 2

[0039] ①Place natural graphite with a volume average particle size of 17.8 μm in a heating device, and heat it at 450°C for 3 hours in a nitrogen atmosphere for heating pretreatment; ②Put 20kg of treated natural graphite and graphitization catalyst (SiC) Add 0.8 kg into the cantilever double-helix conical mixer and mix for 2 hours to obtain the mixture; ③ under stirring, alternately add 20 kg of the mixture and 4 kg of petroleum pitch into the kneading pot, and knead at 160 ° C for 1 hour. Press it into 2~5mm flakes in a tablet machine, crush it into a powder with a particle size of less than 0.1mm, and briquette it into a cylindrical shape; ④Under the protection of nitrogen, carbonize at a temperature of 800°C for 6 hours, and then react The product is cooled to room temperature, and then subjected to high-temperature catalytic graphitization treatment at 3000°C for 48 hours; ⑤ Use a jaw crusher for coarse crushing, and the particle size is controlled below 30mm; use a hammer ...

Embodiment 3

[0041] ①Place natural graphite with a volume average particle size of 12.1 μm in a heating device, and heat it at 350°C for 6 hours in a nitrogen atmosphere for heating pretreatment; ②Put 20kg of treated natural graphite and graphitization catalyst (SiC) Add 1.2kg into the cantilever double-helix conical mixer and mix for 2 hours to obtain the mixture; ③Alternately add 21.2kg of the mixture and 4kg of petroleum pitch into the kneading pot under stirring, and knead at 130°C for 10 hours. After the kneading is completed, Compress it into 2~5mm flakes in a tablet machine, crush it into a powder with a particle size of less than 0.1mm, and briquette it into a cylindrical shape; ④Under the protection of nitrogen, carbonize at a temperature of 1500°C for 3 hours, and then The reaction product is cooled to room temperature, and then subjected to high-temperature catalytic graphitization treatment at 3200°C for 48 hours; ⑤ Use a jaw crusher for coarse crushing, and the particle size is...

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Abstract

The invention discloses a graphite cathode material of a lithium ion battery and a preparation method there, comprising the following steps of: (1) heating natural spherical graphite under 350-450 DEG C for pretreatment; (2) uniformly mixing the pretreated natural spherical graphite and a graphitization catalyst to obtain a mixture; (3) kneading the mixture and an adhesive to obtain a kneaded object, wherein the a mass ratio of the mixture to the adhesive is 2:1:6:1; (4) carbonizing the kneaded object, and then high temperature treating the kneaded object by catalysis and graphitization after cooling; and (5) crushing and grading to obtain the graphite cathode material of the lithium ion battery. The preparation method is simple and feasible, and is suitable for industrialization production. The graphite cathode material of the lithium ion battery has advantages of good electrochemistrical performances, high charging and discharging capacity and efficiency, good heavy-current charging and discharging performances, good cycle performance, tiny expansion when charged, good security, good adaptability on an electrolyte and other additives, property stabilization of the lithium ion battery prepared by the graphite cathode material of the lithium ion battery.

Description

technical field [0001] The invention relates to a lithium ion battery 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 the result...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/587
CPCY02E60/10
Inventor 杜旭丁晓阳乔永民吴志红娄文君
Owner CHENZHOU SHANSHAN NEW MATERIAL
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