Cathode material of lithium ion secondary battery and preparation method thereof

A secondary battery and negative electrode material technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems that do not involve the rate performance of graphite materials, and achieve the effects of improving lithium deintercalation performance, reducing production costs, and stable performance

Active Publication Date: 2010-12-08
JIANGXI ZHENGTUO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above two patents are limited to low-rate lithium-ion battery anode materials, and do not involve improvements in improving the rate performance of graphite materials

Method used

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  • Cathode material of lithium ion secondary battery and preparation method thereof
  • Cathode material of lithium ion secondary battery and preparation method thereof
  • Cathode material of lithium ion secondary battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1. Pulverize 50kg of raw coke through a pulverizer, and the particle size of the pulverized raw coke powder is below 50 μm;

[0016] 2. Put the pulverized green coke into the crucible, and then send it into the tunnel kiln for carbonization treatment at 900°C under nitrogen protection for 5 hours to obtain coke;

[0017] 3. Add boron and silicon powder to the obtained coke, the weight ratio of coke, boron and silicon powder is 100:5:5, and then stir evenly;

[0018] 4. Send the uniformly stirred material into the graphitization furnace, and carry out graphitization treatment under nitrogen protection at 2800°C;

[0019] 5. The graphitized material is crushed, sieved, and mixed to obtain a negative electrode material with a D50 of 12-23 μm.

[0020] 6. Production and testing of button batteries

[0021] 1), Electrolyte: 1M-LiPF6 EC / DMC / EMC

[0022] 2), Binder: LA-133: 3%

[0023] 3), conductive agent: Super-P: 3%

[0024] 4), counter electrode: pure lithium sheet

...

Embodiment 2

[0031] 1. Pulverize 50kg of raw coke through a pulverizer, and the particle size of the pulverized green coke powder is below 50 μm;

[0032] 2. Put the pulverized green coke into the crucible, and then send it into the tunnel kiln for carbonization treatment at 900°C under nitrogen protection for 5 hours to obtain coke;

[0033] 3. Add boric acid and silicon powder to the obtained coke, the weight ratio of coke, boric acid and silicon powder is 100:2:5, and then stir evenly;

[0034] 4. Send the uniformly stirred material into the graphitization furnace, and carry out graphitization treatment under nitrogen protection at 2800°C;

[0035] 5. The graphitized material is crushed, sieved, and mixed to obtain a negative electrode material with a D50 of 12-23 μm.

[0036] 6. Production and testing of button batteries

[0037] 1), Electrolyte: 1M-LiPF6 EC / DMC / EMC

[0038] 2), Binder: LA-133: 3%

[0039] 3), conductive agent: Super-P: 3%

[0040] 4), counter electrode: pure lith...

Embodiment 3

[0047] 1. Pulverize 50kg of raw coke through a pulverizer, and the particle size of the pulverized green coke powder is below 50 μm;

[0048] 2. Put the pulverized green coke into the crucible, and then send it into the tunnel kiln for carbonization treatment under the protection of nitrogen at 1000°C for 5 hours to obtain coke;

[0049] 3. Add boric acid and polyvinyl alcohol to the obtained coke, the weight ratio of coke, boric acid and polyvinyl alcohol is 100:2:3, and then stir evenly;

[0050] 4. Send the uniformly stirred materials into the graphitization furnace, and carry out graphitization treatment under nitrogen protection at 3000°C;

[0051] 5. The graphitized material is crushed, sieved, and mixed to obtain a negative electrode material with a D50 of 12-23 μm.

[0052] 6. Production and testing of button batteries

[0053] 1), Electrolyte: 1M-LiPF6 EC / DMC / EMC

[0054] 2), Binder: LA-133: 3%

[0055] 3), conductive agent: Super-P: 3%

[0056] 4), counter elect...

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Abstract

The invention provides a cathode material of a lithium ion secondary battery, which is characterized in that additive for improving the degree of graphitization and a pore forming agent are added into carbonized green coke, so the prepared graphite cathode material has a porous structure and higher degree of graphitization; and the granularity is regulated, so the compacted density of the produced graphite cathode material is over 1.55g / cm<2>, and the specific area is below 6m<2> / g. The material has the following advantages: 1, the produced cathode material has stable performance and high cost performance, and an effective scheme for controlling battery cost is provided for lithium ion battery companies; 2, the degree of graphitization is over 95 percent, which provides powerful guaranteefor producing cathode materials with excellent performance; and 3, a certain amount of the pore forming agent is added before the graphitization treatment, so the cathode material has a nanometer porous structure, the lithium intercalation performance of the cathode material and the imbibing performance of a pole piece can be effectively improved.

Description

technical field [0001] The invention relates to a lithium ion material and a preparation method thereof, in particular to a lithium ion secondary battery negative electrode material and a preparation method thereof. Background technique [0002] Since Japan's Sony Corporation successfully developed lithium-ion batteries with carbon materials as negative electrodes in 1991, the lithium-ion battery industry has developed rapidly and has been widely used in mobile phones, cameras, notebook computers and portable appliances. Lithium-ion batteries have the characteristics of high working voltage, small size, light weight, high specific energy, no memory effect, no pollution, small self-discharge, and long cycle life. They are ideal power sources for development in the 21st century. [0003] Using graphite materials as lithium-ion battery anode materials has the advantages of good intercalation and delithiation reversibility, low potential platform and excellent cycle performance....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/131
CPCY02E60/122Y02E60/10
Inventor 吴壮雄何月德罗建伟
Owner JIANGXI ZHENGTUO NEW ENERGY TECH CO LTD
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