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Cathode material of C (carbon)/Co (carbon monoxide) lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high electrolyte selectivity, dendrite piercing the diaphragm, capacity attenuation, etc., and achieve short synthesis process and high efficiency. The effect of safety performance and good rate performance

Inactive Publication Date: 2011-11-16
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some problems in graphite-based negative electrode materials: (1) The theoretical specific capacity is low (LiC 6 , 372mAhg -1 ), the actual capacity is lower; (2) the discharge platform is too low (0-0.25V), when the battery is overcharged, it is easy to cause metal lithium to precipitate on the carbon surface, and the formed dendrites pierce the diaphragm, making the battery a potential safety hazard ; (3) High selectivity to the electrolyte, there is solvent co-embedding, resulting in capacity attenuation; (4) In addition, the performance is poor when charging and discharging with a large current

Method used

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  • Cathode material of C (carbon)/Co (carbon monoxide) lithium ion battery and preparation method thereof
  • Cathode material of C (carbon)/Co (carbon monoxide) lithium ion battery and preparation method thereof
  • Cathode material of C (carbon)/Co (carbon monoxide) lithium ion battery and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] (1) Weigh about 0.56 g of cobalt phthalocyanine, 0.24 g of pyrazine and 0.028 g of sodium lauryl sulfate, dissolve them in 35 mL of N,N-dimethylformamide, and stir them ultrasonically for 60 minutes;

[0026] (2) Transfer the liquid obtained in step (1) into a self-pressurized reactor with a polytetrafluoroethylene liner, and then place the reactor in an oven at 160° C. for 4.5 hours;

[0027] (3) After the reaction kettle in the step (2) is naturally cooled, the product is rotary-evaporated in a water bath at 90° C. to obtain a purple-black powdery substance;

[0028] (4) Place the purple-black powder obtained in step (3) in a tube furnace, under the protection of an argon atmosphere with a purity of 99.9993%, rise to 700° C. for a constant temperature heat treatment at a rate of 5° C. / min for 1.0 hour, and then Cool naturally to room temperature to obtain the final product, that is, the negative electrode material of C / Co lithium ion battery.

Embodiment 2

[0030] (1) About 1.12 grams of cobalt phthalocyanine, 0.48 grams of pyrazine and 0.056 grams of sodium lauryl sulfate were weighed and dissolved in 70 mL of N,N-dimethylformamide, and ultrasonically stirred for 100 minutes;

[0031] (2) Transfer the liquid obtained in step (1) into a self-pressurized reactor with a polytetrafluoroethylene liner, and then place the reactor in an oven at 160° C. for 4.5 hours;

[0032] (3) After the reaction kettle in the step (2) is naturally cooled, the product is rotary-evaporated in a water bath at 90° C. to obtain a purple-black powdery substance;

[0033] (4) Place the purple-black powder obtained in step (3) in a tube furnace, under the protection of an argon atmosphere with a purity of 99.9993%, rise to 700° C. for a constant temperature heat treatment at a rate of 5° C. / min for 1.0 hour, and then Cool naturally to room temperature to obtain the final product, that is, the negative electrode material of C / Co lithium ion battery.

Embodiment 3

[0035] (1) Weigh about 0.56 g of cobalt phthalocyanine, 0.24 g of pyrazine and 0.028 g of sodium lauryl sulfate, dissolve them in 35 mL of N,N-dimethylformamide, and stir them ultrasonically for 60 minutes;

[0036] (2) Transfer the liquid obtained in step (1) into a self-pressurized reaction kettle with a polytetrafluoroethylene liner, and then place the reaction kettle in an oven at 180° C. for 4.0 hours;

[0037] (3) After the reaction kettle in the step (2) is naturally cooled, the product is rotary-evaporated in a water bath at 90° C. to obtain a purple-black powdery substance;

[0038] (4) Place the purple-black powder obtained in step (3) in a tube furnace, under the protection of an argon atmosphere with a purity of 99.9993%, rise to 700° C. for a constant temperature heat treatment at a rate of 5° C. / min for 1.0 hour, and then Cool naturally to room temperature to obtain the final product, that is, the negative electrode material of C / Co lithium ion battery.

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Abstract

The invention discloses a cathode material of a C (carbon) / Co (carbon monoxide) lithium ion battery and a preparation method thereof, belonging to the field of cathode materials of lithium ion batteries. The cathode material comprises non-graphitized carbon and Co, and Co nano particles are embedded in a carbon layer dispersedly. The preparation method comprises the following steps: dissolving cobalt phthalocyanine, pyrazine and lauryl sodium sulfate in N, N-dimethylformamide; carrying out thermal polymerization in a self-pressing agitated reactor with a polytetrafluoroethylene inner container; carrying out rotary steaming on products obtained by the thermalpolymerization; and carrying out rotary steaming on the product after thermal polymerization, and then carrying out thermal treatment on the obtained powder samples in an argon atmosphere. The discharge voltage platform of the cathode material is 0.7V on the average; the reversible specific capacity of the cathode material is still 550mAhg<-1> without obvious reduction after the cathode material is cycled for 50 times in the voltage range of 0.005V-3.0V under the charge-discharge rate of 100mAg<-1>; and the cathode material is good in charge-discharge rate performance and has good application prospects.

Description

technical field [0001] The invention relates to a C / Co lithium ion negative electrode material and a preparation method thereof, belonging to the field of lithium ion battery electrode materials. Background technique [0002] Since Sony commercialized lithium-ion batteries in 1990, lithium-ion batteries have been widely used in portable electronic equipment, space technology, and defense industries due to their advantages such as high energy density, high operating voltage, long cycle life, and no memory effect. It has been widely used and extended to fields such as electric vehicles, and has become a hot spot that people pay attention to. [0003] One of the key technologies of lithium-ion batteries is the research on negative electrode materials. At present, commercial anode graphite-based materials occupy a huge market share due to their low cost, high electrical conductivity, and good cycle stability. However, there are some problems in graphite-based negative electrod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/1393
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 赵秀芸乐俊成夏定国刘淑珍
Owner BEIJING UNIV OF TECH