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Co3O4/C lithium ion battery cathode material 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 problem of porous and hollow metal oxide-based nanocomposites with few simple and effective methods, high electrolyte selectivity, and inconvenient mass production Production and other issues, to achieve the effect of good charge and discharge rate performance, stable cycle performance, and low cost

Inactive Publication Date: 2013-05-08
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some problems with 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 puncture the diaphragm, making the battery a potential safety hazard ; (3) High selectivity to electrolyte, there is solvent co-embedding, resulting in capacity decay; (4) In addition, the performance is poor when charging and discharging with high current
However, there are currently few simple and efficient methods for the synthesis of porous and hollow metal oxide-based nanocomposites
Usually, multi-step coating, continuous high-temperature calcination and acid-base etching are very time-consuming and troublesome, which is not convenient for mass production

Method used

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  • Co3O4/C lithium ion battery cathode material and preparation method thereof
  • Co3O4/C lithium ion battery cathode material and preparation method thereof
  • Co3O4/C lithium ion battery cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) Dissolve cobalt nitrate hexahydrate and glucose with a mass ratio of 10-20:1 in a mixture of 25 mL of ethanol and distilled water (the mass ratio of ethanol:distilled water is 4:1), and stir for 1 hour;

[0034](2) Add 0.4g of PVP as a dispersant to the stirred solution, and stir until a clear solution is obtained;

[0035] (3) Transfer the clarified solution obtained in step (2) into a self-pressurized reaction kettle with a 40mL polytetrafluoroethylene liner, seal it, and then place the reaction kettle in a constant temperature drying oven at 220°C for 24 hours;

[0036] (4) After the reaction kettle in step (3) was naturally cooled to room temperature, the product in the reaction kettle was poured out, centrifuged, and washed alternately with pure ethanol and distilled water for 3 times, and dried at 60°C to obtain a powdery substance;

[0037] (5) Put the powder obtained in step (4) in a tube furnace, under the protection of a flowing inert nitrogen atmosphere, ...

Embodiment 2

[0040] (1) Dissolve cobalt nitrate hexahydrate and glucose with a mass ratio of 10-20:1 in a mixture of 25 mL of ethanol and distilled water (the mass ratio of ethanol:distilled water is 4:1), and stir for 1 hour;

[0041] (2) Add 0.4g of PVP as a dispersant to the above stirred solution, and get a clear solution after stirring for a period of time;

[0042] (3) Transfer the clarified solution obtained in step (2) into a self-pressurized reactor with a polytetrafluoroethylene liner of 40 mL, seal it, and then place the reactor in a 220° C. constant-temperature drying oven to insulate for 16 hours;

[0043] (4) After the reaction kettle in step (3) is naturally cooled to room temperature, the product in the reaction kettle is poured out, centrifuged, and washed with pure ethanol and distilled water for 3 times alternately, and dried at 60°C to obtain a powdery substance ;

[0044] (5) Place the powder obtained in step (4) in a tube furnace, under the protection of a flowing in...

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Abstract

The invention discloses a Co3O4 / C lithium ion battery cathode material and a preparation method thereof. The cathode material is prepared by coating a thin carbon layer on the surface of a porous nano ball consisting of Co3O4, and distributing nano holes in the surface of the thin carbon layer. The preparation method comprises the following steps: dissolving cobalt nitrate and glucose in a mixture of ethanol and distilled water, uniformly stirring, adding a dispersing agent, and transferring the mixture into a sealed reaction kettle for reacting; cooling after the reaction is finished, performing centrifugal treatment on the reaction solution, washing the obtained precipitate, drying, annealing the precipitate under protection of inert atmosphere, and cooling the precipitate to obtain the cathode material. The Co3O4 / C lithium ion battery cathode material is high in reversible capacity, stable in cycle performance, excellent in charging and discharging rate performance and has good application prospects; and moreover, according to the method, the cost is low, the preparation process is simple and continuous and large-scale production is easy.

Description

technical field [0001] The present invention relates to a Co 3 o 4 The invention discloses a negative electrode material for a / C lithium ion battery and a preparation method thereof, belonging to the technical field of lithium ion batteries. Background technique [0002] Since Sony launched rechargeable secondary lithium-ion batteries in 1991, compared with traditional lead-acid and nickel-cadmium secondary batteries, lithium-ion batteries have high operating voltage, high specific energy, wide operating temperature range, stable discharge point, With the advantages of long cycle life and no memory effect, it has been widely used in portable electronic equipment, space technology, national defense industry and other fields, and has been extended to electric vehicles and other fields, becoming the fastest growing and brightest market prospect. Battery. [0003] One of the key technologies of lithium-ion batteries is the research on negative electrode materials. At presen...

Claims

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Application Information

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IPC IPC(8): H01M4/52
CPCY02E60/12Y02E60/10
Inventor 刘军万艳玲刘春平刘伟籍少敏周益春王金斌
Owner XIANGTAN UNIV
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