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A hexagonal columnar tricobalt tetroxide precursor and its preparation method, hexagonal columnar tricobalt tetroxide and its application

A technology of cobalt tetroxide and hexagonal prism is applied in the field of electrode materials, which can solve the problems of volume energy density loss, conductive network damage, particle contact loss, etc. in electrochemical energy storage applications, and achieve good economic benefits, high pseudocapacitance effect, and increase reaction power. effect of learning

Active Publication Date: 2021-10-26
UNIVERSITY OF MACAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these nanomaterials also have some disadvantages, for example, the loss of particle contact during charging / discharging, the damage of the conductive network due to the agglomeration effect
In addition, Co 3 o 4 The nanostructure directly leads to a severe loss in volumetric energy density for electrochemical energy storage applications.

Method used

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  • A hexagonal columnar tricobalt tetroxide precursor and its preparation method, hexagonal columnar tricobalt tetroxide and its application
  • A hexagonal columnar tricobalt tetroxide precursor and its preparation method, hexagonal columnar tricobalt tetroxide and its application
  • A hexagonal columnar tricobalt tetroxide precursor and its preparation method, hexagonal columnar tricobalt tetroxide and its application

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preparation example Construction

[0045] On the one hand, the application provides a hexagonal prism cobalt trioxide precursor, the preparation method of which comprises:

[0046] Soluble cobalt salt, plasticizer and precipitant are dissolved in water and subjected to hydrothermal reaction. After the reaction is finished, solid-liquid separation is carried out to prepare a hexagonal prism-shaped cobalt trioxide precursor. Specifically, at room temperature, the soluble cobalt salt is first dissolved in water, and after the soluble cobalt salt is uniformly dispersed, a pink liquid is obtained, and then a plasticizer and a precipitant are added to continue dissolving, and the solution is pink and transparent. Transfer the uniformly mixed liquid to hydrothermal equipment, such as the reaction kettle used in this application, put it in an oven, conduct hydrothermal reaction at 50°C-300°C for 4-8h, take it out and cool it down to room temperature. The pink powder was obtained by solid-liquid separation, and the hexag...

Embodiment 1

[0059] This embodiment provides a preparation method of a hexagonal prism cobalt trioxide precursor, which includes:

[0060] The molar ratio of cobalt nitrate hexahydrate, ammonium fluoride and urea is 1:3:3. At room temperature, 0.293g of cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) Place in 40ml of ultrapure water, disperse for 10 minutes at an ultrasonic frequency of 100 Hz, and dissolve to obtain a pink liquid. Then 0.093g ammonium fluoride (NH4F) and 0.15g urea (CO(NH 2 ) 2 ) was added to the above solution to dissolve, and the solution was pink and transparent. The above mixed solution was transferred to a hydrothermal reaction kettle, placed in an oven, and subjected to a hydrothermal reaction at 80° C. for 6 hours, then taken out and cooled to room temperature. The pink powder obtained by suction filtration is the hexagonal prism cobalt trioxide precursor. SEM image see figure 1 . Depend on figure 1 It can be seen that the size of the prepared hexagonal ...

Embodiment 2

[0062] This embodiment provides a preparation method of a hexagonal prism cobalt trioxide precursor, which includes:

[0063] The molar ratio of cobalt nitrate hexahydrate, ammonium fluoride and urea is 5:7:9. At room temperature, cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) Place in 50ml of ultrapure water, disperse at an ultrasonic frequency of 200 for 5 minutes, and dissolve to obtain a pink liquid. Ammonium fluoride (NH4F) and urea (CO(NH 2 ) 2 ) was added to the above solution to dissolve, and the solution was pink and transparent. The above mixed solution was transferred to a hydrothermal reaction kettle, placed in an oven, and subjected to a hydrothermal reaction at 200° C. for 8 hours, and then taken out and cooled to room temperature. The pink powder obtained by suction filtration is the hexagonal prism cobalt trioxide precursor. The size of the prepared hexagonal cobalt hydroxide is about 2-4 μm, and the precursor has a relatively uniform morphology and pa...

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Abstract

The application provides a hexagonal prism-shaped cobalt tetroxide precursor and its preparation method, hexagonal prism-shaped cobalt tetroxide and its application, which relate to the field of electrode materials. agent is placed in water to be dissolved and carry out hydrothermal reaction, and solid-liquid separation is carried out after reaction finishes, and makes hexagonal prism tricobalt tetroxide precursor; Wherein, the molar ratio of soluble cobalt salt, plasticizer and precipitating agent is (1-5):(3 ‑7): (3‑9). The preparation method is simple, and by controlling the molar ratio of reactants, the prepared cobalt fluoride hydroxide is in the shape of hexagonal columns, and the hexagonal columnar tricobalt tetroxide obtained by calcining it as a precursor, which is compared with the existing commercial tricobalt tetroxide, The rate capability and long-cycle performance are significantly improved, with higher pseudocapacitive effect and significantly increased reaction kinetics. It can also be widely used in lithium-ion batteries.

Description

technical field [0001] The present invention relates to the field of electrode materials, in particular to a hexagonal prism-shaped tricobalt tetroxide precursor and a preparation method thereof, hexagonal prism-shaped tricobalt tetroxide and applications thereof. Background technique [0002] Lithium-ion batteries (LIBs) have been recognized as the most important energy storage systems in portable electronics and automobiles. With the ever-increasing demand for miniaturization of electrochemical energy storage devices, the development of LIBs with high energy density has become an urgent task. The performance of lithium-ion batteries depends largely on the intrinsic properties of the electrode materials. At present, the traditional carbonaceous electrode is close to the theoretical capacity limit (372mAh / g), and the development space is limited. In the past decade, transition metal oxides (TMOs), such as Fe 2 o 3 , Fe 3 o 4 , CoO, Co 3 o 4 , NiO, MnO 2 etc., have r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/04H01M4/52H01M10/0525B82Y30/00
CPCB82Y30/00C01G51/04C01P2002/72C01P2004/03C01P2004/04C01P2004/40C01P2004/61C01P2006/40H01M4/523H01M10/0525Y02E60/10
Inventor 洪果仲云雷
Owner UNIVERSITY OF MACAU
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