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Less-layer rhenium disulfide nanosheet/hollow carbon spheres for sodium-ion battery negative electrode material and preparation method thereof

A sodium ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of poor conductivity, low theoretical specific capacity, volume expansion effect, etc., and achieve high conductivity and buffering Volume effect, the effect of preventing sheet peeling off

Inactive Publication Date: 2018-11-13
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this type of material also faces a series of problems: poor electrical conductivity and low theoretical specific capacity
However, both materials suffer from severe volume expansion effects.

Method used

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  • Less-layer rhenium disulfide nanosheet/hollow carbon spheres for sodium-ion battery negative electrode material and preparation method thereof
  • Less-layer rhenium disulfide nanosheet/hollow carbon spheres for sodium-ion battery negative electrode material and preparation method thereof
  • Less-layer rhenium disulfide nanosheet/hollow carbon spheres for sodium-ion battery negative electrode material and preparation method thereof

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preparation example Construction

[0022] 1. Preparation of hollow porous carbon nanospheres:

[0023] Add 50 mL of absolute ethanol, 5 mL of deionized water, and 1 mL of ammonia water into the beaker in turn and perform magnetic stirring. At the same time, add 0.4 mL of tetraethyl orthosilicate to the above mixture, stir the mixture for a period of time, and weigh Add 0.2 g of resorcinol and 0.2 g of formaldehyde to the above mixed solution in sequence, and stir magnetically for 24 h at a water bath temperature of 30 °C. After the reaction was completed, it was centrifuged and washed to obtain a solid phase and then dried. Under the protection of argon, the dried product was calcined at 600°C for 5 hours at a heating rate of 2°C / min, and then the calcined product was placed in a water bath at 60°C. Etching with 2 M sodium hydroxide solution for 12 h. Finally, the etched product is centrifuged and washed, and the obtained solid phase is dried to obtain hollow porous carbon nanospheres. The obtained porous hol...

Embodiment 1

[0027] Dissolve 0.3 g of ammonium perrhenate and 0.3 g of thioacetamide solid in 70 mL of deionized water, ultrasonically, and at the same time add 0.15 g of hydrazine hydrate to mix evenly, and add 0.18 g of hollow porous carbon nanospheres to ultrasonically disperse in the above solution, Hydrothermal reaction at 80 °C for 1 h, after the reaction was completed, centrifuged and washed to obtain a solid phase and then dried, the dried product was calcined at 400 °C for 2 h under the protection of hydrogen / argon at a heating rate of 2 °C / min, and obtained Few-layer rhenium disulfide nanosheets / hollow carbon sphere nanocomposites (ReS 2 / C).

Embodiment 2

[0029] Preparation of few-layer rhenium disulfide nanosheets / hollow carbon sphere nanocomposites (ReS 2 / C)

[0030] Dissolve 0.3 g of ammonium perrhenate and 0.45 g of thioacetamide solid in 70 mL of deionized water, ultrasonically, and at the same time add 0.24 g of hydrazine hydrate to mix evenly, and add 0.24 g of hollow porous carbon nanospheres to ultrasonically disperse in the above solution, Hydrothermal reaction at 120 °C for 3 h, after the reaction was completed, centrifuged and washed to obtain a solid phase and then dried, the dried product was calcined at 600 °C for 4 h under the protection of hydrogen / argon at a heating rate of 2 °C / min, and obtained Few-layer rhenium disulfide nanosheets / hollow carbon sphere nanocomposites (ReS 2 / C).

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Abstract

The invention discloses less-layer rhenium disulfide nanosheet / hollow carbon spheres for a sodium-ion battery negative electrode material and a preparation method thereof. The negative electrode material is formed by attaching rhenium disulfide nanosheets to carbon shells inside and outside the porous hollow carbon spheres. The preparation method of the negative electrode material comprises the following steps: taking ammonium perrhenate as a precursor, taking thioacetamide as a sulfur source, taking hydrazine hydrate as a reducing agent, and taking the porous hollow carbon spheres as a rhenium disulfide growth framework, thereby obtaining the negative electrode material. According to the negative electrode material prepared in the invention, the porous hollow carbon spheres of uniform particle size are taken as the framework, and the rhenium disulfide sheet structures are uniformly dispersed on the carbon shells. According to use of the porous hollow carbon spheres, the number of growth layers of the rhenium disulfide nanosheets is limited as 2-7. The less-layer rhenium disulfide nanosheet / hollow carbon sphere nanocomposite material has many sodium-embedded active sites and high conductivity, the volume effect can be buffered by the inner cavity, the sheet layers are prevented from dropping to maintain the structural stability, and the rhenium disulfide nanosheets do not haveany obvious agglomeration phenomenon.

Description

technical field [0001] The invention belongs to the technical field of sodium ion battery material synthesis, in particular to a few-layer ReS 2 Nanosheet / hollow carbon sphere composites (ReS 2 / C) and its preparation method. Background technique [0002] The initial research on sodium-ion batteries was almost simultaneous with that of lithium-ion batteries. With the large-scale use of lithium-ion batteries in electronic devices and the potential demand for electric vehicles and large-scale grid energy storage, people's concerns about lithium reserves in the earth's crust are gradually increasing. Considering the similar chemical properties of sodium ions and lithium ions and the abundant reserves of sodium in the earth's crust, research on sodium-ion batteries has been revived in recent years. Compared with lithium-ion batteries, sodium-ion batteries have obvious advantages in the following aspects: 1. The reserve of sodium in the earth's crust is more than 1000 times th...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/054
CPCH01M4/362H01M4/5815H01M4/583H01M10/054Y02E60/10
Inventor 陈铭张秀娥丁蔚然沈超韩悦
Owner YANGZHOU UNIV
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