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Preparation method of three-dimensional core-shell nanoflower array material as well as product and application thereof

A technology of nano-flowers and arrays, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem that batteries cannot realize high-current charging and discharging, limit the application range of lithium-ion batteries, and the diffusion coefficient of lithium-ion Minor problems, to achieve the effect of no pollution, improved electrochemical performance, and simple preparation method

Pending Publication Date: 2022-03-08
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]Since the early 1990s, Japanese scientific and technological workers have developed layered carbon materials. Carbon materials were the first to be studied and applied to lithium-ion The materials for commercialization of batteries are still one of the focuses of everyone's attention and research, but there are some defects in carbon negative electrode materials: when the battery is formed, it reacts with the electrolyte to form an SEI film, resulting in the consumption of the electrolyte and low initial Coulombic efficiency ; When the battery is overcharged, metal lithium may be precipitated on the surface of the carbon electrode, forming lithium dendrites to cause a short circuit, causing the temperature to rise and the battery to explode; in addition, the diffusion coefficient of lithium ions in the carbon material is small, resulting in the failure of the battery to achieve large Current charge and discharge, thus limiting the application range of lithium-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A three-dimensional core-shell nanoflower array material, which is Co 3 o 4 @ZnCo 2 S 4 , prepared by three-step hydrothermal reaction, and then calcined, prepared according to the following steps,

[0022] Step 1: Dissolve cobalt nitrate, ammonium fluoride and urea in deionized water so that the molar ratio of cobalt nitrate, ammonium fluoride and urea is 2:8:10, dissolve in 40 mL deionized water and stir magnetically for 30 min Transfer to a 100 mL reactor, then place the clean zinc strips in the reactor, seal it, react at 100 °C for 12 h, cool to room temperature, and wash the zinc strips with deionized water and ethanol three times;

[0023] Step 2: Dissolve soluble zinc nitrate and urea in another 40 mL of deionized water, wherein the molar ratio of zinc nitrate, urea and cobalt nitrate in the first step is 1:1:2, and transfer it into the above In a 100 mL reactor, react at 100 °C for 8 h, and wash 5 times with deionized water and ethanol;

[0024] Step 3: Dis...

Embodiment 2

[0028] A three-dimensional core-shell nanoflower array material, similar to the steps in Example 1, prepared according to the following steps,

[0029] Step 1: Dissolve cobalt citrate, ammonium fluoride and urea in deionized water so that the molar ratio of cobalt citrate, ammonium fluoride and urea is 2:8:10, dissolve in 40 mL deionized water and stir magnetically Transfer to a 100 mL reactor for 60 minutes, then place the clean zinc strips in the reactor, seal it, react at 120 °C for 9 h, cool to room temperature, and wash the zinc strips with deionized water and ethanol three times;

[0030] The second step: dissolve soluble zinc citrate and urea in another 40 mL of deionized water, wherein the molar ratio of zinc citrate, urea and cobalt citrate in the first step is 1:1:2, and transfer it to In the above reaction kettle containing zinc flakes, react at 100 °C for 8 h, wash with deionized water and ethanol for 5 times;

[0031] Step 3: Dissolve ammonium sulfide in deionize...

Embodiment 3

[0035] A three-dimensional core-shell nanoflower array material, similar to the steps in Example 1, prepared according to the following steps,

[0036] Step 1: Dissolve cobalt acetate, ammonium fluoride and urea in deionized water so that the molar ratio of cobalt acetate, ammonium fluoride and urea is 2:8:10, dissolve in 40 mL of deionized water and stir magnetically for 60 min Transfer to a 100 mL reactor, then place the clean zinc strips in the reactor, seal it, react at 120 °C for 9 h, cool to room temperature, and wash the zinc strips with deionized water and ethanol three times;

[0037] Step 2: Dissolve soluble zinc acetate and urea in another 40 mL of deionized water, wherein the molar ratio of zinc acetate, urea, and cobalt acetate in the first step is 1:1:2, and transfer it to the above-mentioned solution containing zinc In the reaction kettle of the chip, react at 100 °C for 8 h, wash 5 times with deionized water and ethanol;

[0038]Step 3: Dissolve ammonium sulfi...

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Abstract

The invention provides a preparation method of a three-dimensional core-shell nanoflower array material as well as a product and application of the three-dimensional core-shell nanoflower array material, cobalt salt, ammonium fluoride and urea are dissolved in deionized water, stirred and transferred into a reaction kettle, then a clean zinc strip is placed in the reaction kettle, sealed for reaction and cooled to room temperature, and a zinc sheet is washed with deionized water and ethanol; the preparation method comprises the following steps: dissolving soluble zinc salt and urea in deionized water, transferring into a reaction kettle containing a zinc sheet for reaction, and washing with deionized water and ethanol; the preparation method comprises the following steps: dissolving ammonium sulfide in deionized water, adding an aqueous solution dissolved with urea into a reaction kettle containing a zinc sheet, dropwise adding an ammonium sulfide solution, and reacting; taking out the zinc sheet and drying; and placing the zinc sheet in inert gas, and calcining to obtain a final product. The preparation method is simple, the process conditions are easy to realize, the energy consumption is low, and the preparation is pollution-free.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery anode materials, in particular to a preparation method of a three-dimensional core-shell nanoflower array material and its product and application. Background technique [0002] With the development of society, lithium-ion batteries have attracted much attention. Lithium-ion battery is currently the most ideal rechargeable battery in the world. It not only has the advantages of high energy density, long cycle life, no memory effect and low pollution. With the advancement of technology, lithium-ion batteries will be widely used in fields such as electric vehicles, aerospace and biomedicine. Therefore, the research and development of lithium-ion batteries and related materials for power is of great significance. For lithium-ion batteries for power, the key is to increase the power density and energy density, and the root of the increase in power density and energy density is the improve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/58H01M10/0525B82Y30/00
CPCH01M4/366H01M4/52H01M4/5815H01M10/0525B82Y30/00H01M2004/027H01M2004/021Y02E60/10
Inventor 崔大祥吴晓燕林琳王敬锋陈超
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH