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A kind of spherical cobalt difluoride used for battery cathode material and preparation method thereof

A battery positive electrode and cobalt difluoride technology, which is applied in nanotechnology for materials and surface science, battery electrodes, circuits, etc., can solve problems such as hindering applications and poor conductivity, reduce safety hazards, and increase specific capacitance , the effect of shortening the preparation cycle

Active Publication Date: 2017-02-01
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its large energy band gap and the high insulating substance LiF formed during the intercalation / extraction of lithium ions, this type of material has extremely poor conductivity, which hinders its application in the field of battery cathode materials.

Method used

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  • A kind of spherical cobalt difluoride used for battery cathode material and preparation method thereof
  • A kind of spherical cobalt difluoride used for battery cathode material and preparation method thereof
  • A kind of spherical cobalt difluoride used for battery cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Weigh 0.29g of cobalt nitrate hexahydrate, 0.12g of ammonium fluoride, and 0.3g of urea, the molar ratio of cobalt nitrate hexahydrate, ammonium fluoride and urea is 1:3:5, stir and mix in 50mL ethylene glycol solution, The concentration of cobalt nitrate hexahydrate dissolved in ethylene glycol was 5.8 mg / mL to obtain a pink homogeneous mixed solution; then, the mixed solution was transferred to a polytetrafluoroethylene-lined reactor and reacted at 200°C for 20 hours; After the reaction is completed, centrifuge to collect the precipitated matter, wash with absolute ethanol and deionized water three times respectively, dry at 50°C for 12 hours in a blast drying oven, and grind to obtain a pink powder sample. The SEM picture of the sample is as follows figure 1 , indicating that the sample is a spherical CoF 2 , is composed of stacked nano-sized particles, with a particle size of 100-500nm.

[0024] Mix the spherical cobalt difluoride powder, conductive carbon black, ...

Embodiment 2

[0026] Take by weighing cobalt nitrate hexahydrate 0.29g, ammonium fluoride 0.12g and urea 0.3g, the mol ratio of hexahydrate cobalt nitrate, ammonium fluoride and urea is 1:3:5, stir and mix in 100mL ethylene glycol solution, six The concentration of cobalt nitrate in water dissolved in ethylene glycol was 2.9mg / mL, and a pink homogeneous mixed solution was obtained; then, the mixed solution was transferred to a polytetrafluoroethylene-lined reactor and reacted at 180°C for 20h; After completion, centrifuge to collect the precipitated matter, wash with absolute ethanol and deionized water three times respectively, dry at 80°C for 6 hours in a blast drying oven, and grind to obtain a pink powder sample. The SEM images of samples with figure 1 The structures shown are similar, indicating that the sample is a spherical CoF 2 , is composed of stacked nano-sized particles, with a particle size of 100-500nm.

[0027] Mix the spherical cobalt difluoride powder, conductive carbon b...

Embodiment 3

[0029] Take by weighing cobalt nitrate hexahydrate 0.29g, ammonium fluoride 0.12g and urea 0.3g, the mol ratio of hexahydrate cobalt nitrate, ammonium fluoride and urea is 1:3:5, stir and mix in 80mL ethylene glycol solution, six The concentration of cobalt nitrate in water dissolved in ethylene glycol was 3.6mg / mL, and a pink homogeneous mixed solution was obtained; then, the mixed solution was transferred to a polytetrafluoroethylene-lined reactor and reacted at 140°C for 20 hours; After completion, centrifuge to collect the precipitated matter, wash with absolute ethanol and deionized water three times respectively, dry at 70°C for 7 hours in a blast drying oven, and grind to obtain a pink powder sample.

[0030] Mix the spherical cobalt difluoride powder, conductive carbon black, and binder (PVDF) obtained above at a ratio of 80:10:10, apply the slurry on the Al foil, and dry it at 70°C. Roll on a roller machine, cut into discs with a diameter of 8mm, put them in a vacuum ...

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Abstract

The invention discloses a spherical cobaltous fluoride for a battery positive material. The spherical cobaltous fluoride is synthesized by ammonium fluoride as a fluorine source, cobalt nitrate hexahydrate as a cobalt source, and ethylene glycol as a solvent by adopting a hydrothermal method, and is spherical CoF2 with the particle sizes are 100-500nm and formed by stacking small nano particles. The invention further discloses a preparation method of the spherical cobaltous fluoride. The method comprises the following steps: weighing cobalt nitrate hexahydrate, ammonium fluoride and urea according to a molar ratio of 1 to (3-4) to (4-5), stirring for dissolving into ethylene glycol, and then transferring into a reaction kettle of which an lining is made from polytetrafluoroethylene; reacting at 120-200 DEG C for 2-40 hours, centrifuging, washing and collecting sediments; and drying the sediments and grinding to form the spherical CoF2. The preparation process disclosed by the invention is simple; the cost is reduced; the preparation cycle is shortened; the efficiency is improved; the volume change for stripping / embedding lithium-ions in the charge and discharge processes is overcome by the spherical CoF2; the specific capacitance of the spherical cobaltous fluoride as the positive material is greatly improved; and the cycle life is greatly prolonged.

Description

technical field [0001] Embodiments of the present invention relate to the field of lithium battery energy, more specifically, embodiments of the present invention relate to a kind of anode material for batteries, especially a spherical CoF synthesized by hydrothermal 2 and its preparation method. Background technique [0002] In recent years, lithium-ion batteries have been widely used as a new type of rechargeable and dischargeable energy storage device in portable electronic devices such as household appliances, laptops and mobile phones. Among the electrode materials used in lithium-ion batteries, after extensive and in-depth research, it has been found that the cathode materials also play a key role in improving the performance of the entire battery. Among them, metal fluorides are preferred due to their high theoretical capacitance. It has become one of the latest and most potential positive electrode materials, and is favored by researchers from all over the world. H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/1397H01M4/582Y02E60/10
Inventor 王斌官群程建丽
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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