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Three-dimensional porous carbon-coated zinc selenide material for negative electrode of lithium ion battery and preparation method thereof

A three-dimensional porous, zinc selenide technology, applied in the fields of materials and energy, can solve the problems of being unable to meet high capacity, long life and excellent rate performance at the same time, and achieve the effects of easy industrial production, high capacity and high product purity

Active Publication Date: 2019-10-15
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the shortcomings of the above-mentioned technologies that cannot satisfy high capacity, long life and excellent rate performance at the same time, the present invention provides a three-dimensional porous carbon-coated zinc selenide material that is cost-effective, stable in performance, and industrially-producible and its preparation method and in Applications in the field of lithium-ion batteries

Method used

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  • Three-dimensional porous carbon-coated zinc selenide material for negative electrode of lithium ion battery and preparation method thereof
  • Three-dimensional porous carbon-coated zinc selenide material for negative electrode of lithium ion battery and preparation method thereof
  • Three-dimensional porous carbon-coated zinc selenide material for negative electrode of lithium ion battery and preparation method thereof

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Embodiment 1

[0021] Embodiment 1: three-dimensional porous carbon-coated zinc selenide material and its preparation method and application, comprising the following steps:

[0022] (1) Preparation of ZIF-8 template with polyhedral morphology: Weigh 1.45 g of zinc nitrate hexahydrate and 1.66 g of 2-methylimidazole, dissolve them in 20 ml of methanol solution, stir and dissolve, and dissolve 2-methylimidazole Pour the imidazole solution into the zinc nitrate solution; stir for 5 minutes, let it stand at room temperature for 24 hours, centrifuge the product, wash it with ethanol solution for 4 times, and finally place it in a drying oven at 55 degrees Celsius. The obtained product is polyhedral ZIF -8; The product is white, mostly rhomboid dodecahedron, and the particle size is mainly distributed between 600 and 900 nanometers;

[0023] (2) Three-dimensional porous zinc selenide material and preparation: Weigh 200 mg of ZIF-8 and 200 mg of selenium powder and place them on both ends of the p...

Embodiment 2

[0026] Embodiment 2: three-dimensional porous carbon-coated zinc selenide material and its preparation method and application, comprising the following steps:

[0027] (1) Preparation of ZIF-8 template with polyhedral morphology: Weigh 1.45 g of zinc nitrate hexahydrate and 1.66 g of 2-methylimidazole, dissolve them in 20 ml of methanol solution, stir and dissolve, and dissolve 2-methylimidazole Pour the imidazole solution into the zinc nitrate solution; stir for 5 minutes, let it stand at room temperature for 24 hours, centrifuge the product, wash it with ethanol solution for 4 times, and finally place it in a drying oven at 55 degrees Celsius. The obtained product is polyhedral ZIF -8; The product is white, mostly rhomboid dodecahedron, and the particle size is mainly distributed between 600 and 900 nanometers;

[0028] (2) Three-dimensional porous zinc selenide material and preparation: Weigh 200 mg of ZIF-8 and 200 mg of selenium powder and place them on both ends of the p...

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Abstract

The invention belongs to the technical field of material and energy and particularly relates to three-dimensional porous carbon-coated zinc selenide material for lithium ion battery anodes and a preparation method of the material. The preparation method comprises the specific steps of sintering zinc-based zeolite imidazate metal organic framework material (ZIF-8) as a precursor or template with selenium powder under the protection of an inert atmosphere at high temperature for a certain time, and carrying out synchronous selenization and carbonization to finally prepare the carbon-coated zinc selenide composite material. The composite material prepared herein and the preparation method thereof provide effective composition of zinc selenide and graphite carbon, the component ingredients generate great interfacial coupling effect, volume expansion effect of the zinc selenide material during charging and discharging can be effectively relieved and inhibited, the conductivity of the material is improved, and accordingly the composite material has very high specific capacity and excellent cycle stability and rate performance when applied as lithium ion battery anode material. The preparation process is simple, the preparation conditions are mild, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of materials and energy, and in particular relates to a three-dimensional porous carbon-coated zinc selenide material used for a negative electrode of a lithium-ion battery and a preparation method thereof. Background technique [0002] With the development of the economy, the demand for energy is also increasing. People have discovered a variety of available clean energy, and the development of energy conversion and storage technology is also very important. Removable cyclic charge-discharge batteries are currently the most widely used energy storage methods. Lithium-ion batteries are widely used in various portable electronic devices due to their advantages of high energy density, long cycle life and environmental friendliness. With the increase in demand, people have higher and higher requirements for the performance of lithium-ion batteries. How to increase battery capacity, prolong cycle life, and impr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/581H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 吴仁兵王浩陈子亮
Owner FUDAN UNIV