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

A lithium-ion battery, composite graphite technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low discharge capacity and poor cycle performance, and achieve good charge-discharge performance, high retention rate, and good electrochemical performance. Effect

Active Publication Date: 2016-09-14
上海杉杉新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 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 to provide a lithium ion battery composite graphite negative electrode material and its preparation method

Method used

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

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Effect test

Embodiment 1

[0038] 1. the volume average particle diameter D50 is 14kg of natural graphite of 19.3 μ m, the volume average particle diameter D50 is 6 kg of mesophase graphite and graphitization catalyst (SiC) 1.2 kg added in the cantilever double-helix conical mixer and mixed for 2 hours, To obtain the mixture; ② under stirring, alternately add 20kg of the mixture and 12kg of petroleum asphalt into the kneading pot, carry out kneading treatment at 160°C for 1 hour, after the kneading is completed, press it into a 2-5mm sheet in a tablet machine, and crush it into Powder with a particle size of 0.1mm or less is formed into briquettes; ③Under the protection of nitrogen, carbonize at 1100°C for 2 hours, then cool the reaction product to room temperature, and then carry out catalytic graphitization high-temperature treatment at 2800°C for 36 hours ; ④Use a jaw crusher for coarse crushing, and the particle size is controlled below 30mm; use a hammer crusher for medium crushing, and the particle...

Embodiment 2

[0040] 1. 10 kg of natural graphite with a volume average particle diameter D50 of 17.8 μm, 10 kg of mesophase graphite and graphitization catalyst (SiC) 1.2 kg with a volume average particle diameter D50 of 20.5 μm were added to a cantilever double-helix conical mixer and mixed for 2 hours, Obtain the mixture; ② under stirring, alternately add 20kg of the mixture and 3kg of petroleum asphalt into the kneading pot, carry out kneading treatment at 160°C for 1 hour, after the kneading is completed, press it into a 2-5mm sheet in a tablet machine, and crush it into Powder with a particle size of less than 0.1mm is formed into a compact; ③Under the protection of nitrogen, carbonize at 800°C for 6 hours, then cool the reaction product to room temperature, and then carry out catalytic graphitization at 3000°C for 48 hours Processing; ④Use a jaw crusher for coarse crushing, and the particle size is controlled below 30mm; use a hammer crusher for medium crushing, and the particle size ...

Embodiment 3

[0042] 1. the volume average particle diameter D50 is 15kg of natural graphite of 12.1 μ m, the volume average particle diameter D50 is 29.8 μ m of mesophase graphite 5 kg and graphitization catalyst (SiC) 1.2 kg is added in the cantilever double-helix conical mixer and mixed for 2 hours, Obtain the mixture; ② under stirring, alternately add 20kg of the mixture and 4kg of petroleum asphalt into the kneading pot, carry out kneading treatment at 100°C for 10 hours, after the kneading is completed, press it into a 2-5mm sheet in a tablet machine, and crush it into Powder with a particle size of 0.1mm or less is formed into a compact; ③Under the protection of nitrogen, carbonize at 1500°C for 3 hours, then cool the reaction product to room temperature, and then carry out catalytic graphitization at 3200°C for 48 hours Processing; ④Use a jaw crusher for coarse crushing, and the particle size is controlled below 30mm; use a hammer crusher for medium crushing, and the particle size is...

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Abstract

The invention discloses a preparation method for a composite graphite negative electrode material of a lithium ion battery. The preparation method comprises the following steps: (1) uniformly mixing spherical natural graphite, mesophase graphite and a graphitized catalyst so as to obtain a mixture; (2) kneading the mixture and an adhesive so as to obtain a kneading product; (3) carrying out carbonizing treatment at first, then cooling and finally catalytic graphitization high temperature treatment; and (4) carrying out crushing and grading. The preparation method provided by the invention is simple and feasible and is applicable to industrial production. The prepared composite graphite negative electrode material has the advantages of good electrochemical properties, discharge capacity of more than 360 mAh / g, high charge and discharge efficiency, good heavy-current charge and discharge performance, excellent cycle performance, small expansion during charging, good security and good adaptability to electrolytes and other additives; and a lithium ion battery product prepared from the composite graphite negative electrode material has stable properties, and different batches of such product barely show difference.

Description

technical field [0001] The invention relates to a lithium ion battery composite graphite negative electrode material and a preparation method thereof. Background technique [0002] In recent years, with the miniaturization of electronic devices, there has been an increasing need for a secondary battery with a larger capacity. 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 elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38
CPCY02E60/10
Inventor 谢秋生张鹏昌杜辉玉薄维通陈志明胡东山
Owner 上海杉杉新材料有限公司
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