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Preparation method of nano composite material and lithium ion electrode negative electrode material thereof

A nanocomposite material and nanomaterial technology, applied in the field of nanocomposite materials, can solve problems such as poor electrochemical performance, achieve low toxicity, relieve volume expansion, and shorten the electron and ion transmission path.

Pending Publication Date: 2022-05-27
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the problem of poor electrochemical performance of Fe3O4 as the negative electrode material of lithium-ion batteries, and provides a Fe ferric oxide with relatively uniform dispersion, large inner cavity volume and good electrochemical performance. 3 o 4 @C / MoSe 2 Composite materials to improve cycling stability and rate performance of Fe3O4 as Li-ion electrode material

Method used

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  • Preparation method of nano composite material and lithium ion electrode negative electrode material thereof
  • Preparation method of nano composite material and lithium ion electrode negative electrode material thereof
  • Preparation method of nano composite material and lithium ion electrode negative electrode material thereof

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Embodiment 1

[0025] The first step is to prepare core-shell Fe 3 O 4 @C : 80mg made in the laboratory α -Fe 2 O 3 Nano-cubes, water and ammonia water are uniformly dispersed in ethanol under ultrasound, wherein the volume ratio of water, ammonia water and anhydrous ethanol is 2.5:1:20, α -Fe 2 O 3 The dispersion concentration was 50 mg / 100 mL, the mixed solution was placed in a 250 mL three-necked flask, mechanically stirred at a water bath temperature of 30 °C, and then 30 mg of resorcinol and 64 μL of formaldehyde solution were added, and stirred for 24 h. , the precipitate was collected by centrifugation, and dried in a vacuum drying oven at 60 °C for 12 h. Then annealed at 700 °C for 3 h under the protection of argon in a tube furnace, the annealed sample was etched with 40 mL of hydrochloric acid (4 mol / L) for 30 min, then washed with water, centrifuged to separate the etched solid phase, and finally moved to vacuum Dry in a drying oven at 60 °C for 12 h to obtain a carbon box ...

Embodiment 2

[0028] (1) Preparation of core-shell Fe 3 O 4 @C: Preparation of core-shell Fe 3 O 4 @C : 80mg made in the laboratory α -Fe 2 O 3 Nano-cubes, water and ammonia water are uniformly dispersed in ethanol under ultrasound, wherein the volume ratio of water, ammonia water and anhydrous ethanol is 2:1:25, α -Fe 2 O 3 The dispersion concentration of the solution was 50 mg / 100 mL, the mixture was poured into a 250 mL three-necked flask, mechanically stirred at a water bath temperature of 25 °C, and then 25 mg of resorcinol and 54 μL of formaldehyde solution were added, and stirred for 30 h until the reaction was over. After that, the precipitate was collected by centrifugation, dried in a vacuum drying box at 60 °C for 12 h; then annealed at 750 °C for 5 h under the protection of argon in a tube furnace, and the annealed sample was etched with 40 mL of hydrochloric acid (4 mol / L) for 30 min. , washed twice with deionized water, and finally moved to a vacuum drying oven at 60 °...

Embodiment 3

[0031] (1) Preparation of core-shell Fe 3 O 4 @C: 80mg made in the lab α -Fe 2 O 3 Nano-cubes, water and ammonia water are uniformly dispersed in ethanol under ultrasound, wherein the volume ratio of water, ammonia water and absolute ethanol is 2:1:23, α -Fe 2 O 3 The dispersion concentration was 50 mg / 100 mL, the mixture was poured into a 250 mL three-necked flask, mechanically stirred at a water bath temperature of 35 °C, and then 75 mg of resorcinol and 160 μL of formaldehyde solution were added, and stirred for 24 h. , the water precipitate was collected by centrifugation, and dried in a vacuum drying oven at 60 °C for 12 h. Then annealed at 720 °C for 4 h under the protection of argon in a tube furnace, the annealed samples were etched with 40 mL of hydrochloric acid (4 mol / L) for 30 min, washed with deionized water for 3 times, and finally moved to a vacuum drying box to dry at 60 °C 12h, obtain the ferric tetroxide as the core carbon box as the shell (Fe 3 O 4 ...

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Abstract

The invention relates to a preparation method of a nano composite material and a lithium ion electrode negative electrode material thereof, an alpha-Fe2O3 cube is used as a template, the surface of the alpha-Fe2O3 cube is coated with phenolic resin in situ, a carbon-coated ferroferric oxide cube is formed through annealing treatment, and then hydrochloric acid is used for partial etching to form a nano material with ferroferric oxide as a core and a carbon box as a shell (Fe3O4 at C); and then coating molybdenum selenide on the carbon shell in situ through a hydrothermal reaction, and annealing to prepare the flaky molybdenum selenide coated nano composite material Fe3O4 (at) C / MoSe2 with ferroferric oxide as a core and a carbon box as a shell. According to the nano composite material, the Fe3O4 (at) C / MoSe2 nano composite material is prepared through a step-by-step growth strategy and has the advantages of being uniform in dispersion, large in inner cavity size, good in electrochemical performance, good in cycling stability and rate capability when being used as a lithium ion electrode negative electrode material and the like.

Description

technical field [0001] The present invention relates to the technical field of lithium ion electrode materials, in particular to a nanocomposite material for a negative electrode of a lithium ion battery. Background technique [0002] To meet the growing energy demands of mankind, it is crucial to develop new-generation lithium-ion batteries (LIBs) with excellent performance. As an important part of lithium-ion batteries, anode materials affect the electrochemical performance of the entire battery. The traditional LIBs prepared from graphite materials have low specific capacity (372 mA h g -1 ), it is difficult to meet the increasingly high application requirements of LIBs in applications such as portable electronic devices, electric vehicles, and large-scale energy storage. Therefore, the search for a cheap, high energy density and good cycle performance negative electrode material has become a hot spot in the research field of Li-ion batteries. [0003] Ferric oxide is ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/58B82Y40/00B82Y30/00
CPCH01M4/366H01M4/525H01M4/58B82Y30/00B82Y40/00Y02E60/10
Inventor 李娟徐蓉杨丽楠杨慧贞
Owner YANGZHOU UNIV
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