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Preparation method of zinc-cobalt-nickel battery positive electrode composite material

A composite material, nickel battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low capacity and poor stability of zinc-cobalt-nickel batteries, and achieve the effects of good stability, rich materials, and excellent electrochemical performance.

Pending Publication Date: 2022-06-24
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to prepare a high-capacity, high-stability aqueous zinc-cobalt-nickel battery to solve the problems of low capacity and poor stability of the current zinc-cobalt-nickel battery

Method used

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  • Preparation method of zinc-cobalt-nickel battery positive electrode composite material
  • Preparation method of zinc-cobalt-nickel battery positive electrode composite material
  • Preparation method of zinc-cobalt-nickel battery positive electrode composite material

Examples

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Effect test

Embodiment 1

[0037] (1) Pretreatment of nickel foam

[0038] Cut 3*5cm 2 The nickel foam was immersed in 3 mol / L dilute hydrochloric acid for 10 min to remove the nickel oxide on the surface, then transferred to 50 ml of absolute ethanol, ultrasonicated for 15 min to remove the dilute hydrochloric acid on the surface, and then dried in a blast drying oven at 60 °C spare.

[0039] (2) Preparation of cobalt phosphate

[0040] 1.8 mM cobalt nitrate, 1.2 mM ammonium dihydrogen phosphate, and 4 mM urea were fully dissolved in 80 mL of deionized water, stirred at room temperature, the resulting solution was transferred to a hydrothermal kettle, and the pretreated nickel foam ( 3 × 5 cm 2 ) was immersed in the solution in the hydrothermal kettle, sealed, and then placed in a blast drying oven for hydrothermal reaction at 120°C for 6 hours. After the reaction, the sample was taken out, and the substances on the surface were washed with deionized water and anhydrous ethanol in turn, placed in a...

Embodiment 2

[0042] Fully dissolve 1 mM nickel nitrate, 1 mM cobalt nitrate, 6 mM ammonium fluoride and 15 mM urea in 70 ml of deionized water, stir at room temperature for 2 h to fully dissolve, transfer the resulting solution to the reaction kettle, and then put it into the The cobalt phosphate octahydrate material obtained in Example 1 was sealed and placed in a blast drying oven for hydrothermal reaction at 120°C for 5 hours. After the reaction, the sample was taken out, and the surface was washed with deionized water and absolute ethanol in turn. The existing substances were placed in a blast drying oven and kept at 60°C for 6h. image 3 For the SEM of the sample, it can be seen that the sample is grown on cobalt phosphate octahydrate with a nano-sheet layered structure.

Embodiment 3

[0044] Fully dissolve 1 mM nickel nitrate, 1 mM cobalt nitrate, 0.5 mM sodium molybdate, 6 mM ammonium fluoride and 15 mM urea in 70 ml of deionized water, stir at 35°C for 2 h to fully dissolve, and transfer the resulting solution to a Then put the cobalt phosphate octahydrate material obtained in Example 1 into the reaction kettle. After sealing, it was placed in a blast drying oven, and hydrothermally reacted at 120 ° C for 5 hours. After the reaction, the sample was taken out, and deionized Wash the substances present on the surface with water and anhydrous ethanol, place it in a blast drying oven, keep it at 60°C for 6 hours, and dry it for later use. The sample is marked as ( MCN-LDH@CP-0.5 ).

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Abstract

The invention introduces a preparation method of a zinc-cobalt-nickel battery positive electrode composite material, a molybdate intercalated cobalt-nickel hydroxide coated cobalt phosphate heterojunction material is obtained, the intercalation of molybdate increases the interlayer spacing, the cobalt-nickel hydroxide and cobalt phosphate form the heterojunction material, and the surface capacity and stability of a positive electrode active material are improved. The positive electrode material is prepared through a two-step hydrothermal method, firstly, nanosheet-shaped cobalt phosphate grows on a three-dimensional substrate through a one-step hydrothermal method, then a sample obtained in the first step is subjected to a one-step hydrothermal method to obtain molybdate intercalated flaky cobalt-nickel hydroxide evenly growing on the surface of the cobalt phosphate, and the material is applied to an aqueous zinc-cobalt-nickel battery. The material has high capacity and good cycle stability, and is simple in preparation process and suitable for large-scale production and application.

Description

technical field [0001] The invention relates to the technical field of advanced energy storage materials, in particular to a high-performance positive electrode material of a water-based zinc-cobalt-nickel battery. [0002] technical background [0003] In recent years, great progress has been made in high-performance electrochemical energy storage technologies, including lead-acid batteries, lithium-ion batteries, and zinc-based batteries. The commercialization of lead-acid batteries is relatively early, but there are disadvantages such as low capacity and short service life. At present, there is an urgent need for new energy storage power sources that are efficient, safe, environmentally friendly and low-cost. Among the rapidly developing energy storage devices, lithium-ion batteries are considered as a candidate power source due to their high output voltage and high energy density. Due to safety issues, lithium-ion batteries still cannot meet a wide range of applications...

Claims

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Application Information

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IPC IPC(8): H01M4/525
CPCH01M4/525
Inventor 孙小华周琳翔刘秋恒马晓霖吕晓伟孙盼盼
Owner CHINA THREE GORGES UNIV
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