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Composite sodium ion battery negative electrode material and preparation method thereof

A sodium-ion battery and negative electrode material technology, applied in the field of electrochemistry, can solve the problems of small specific capacity, poor cycle performance, poor rate performance, etc., and achieve the effects of small capacity decay, large reversible capacity, and good charge-discharge performance.

Inactive Publication Date: 2018-04-10
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reversible specific capacity of carbon materials is about 300 mAh / g, although its cycle performance is good, but the rate performance is poor and the specific capacity is small
Alloy materials have large specific capacity, but their cycle performance is not good

Method used

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  • Composite sodium ion battery negative electrode material and preparation method thereof
  • Composite sodium ion battery negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 1.4526g of germanium powder and 3.0973g of red P powder, mix and grind in a mortar, and put the mixed powder into a ball mill jar in a glove box. The sample was ball-milled for 6h with a ball-to-material ratio of 20:1 to obtain GeP 5 powder. Weigh 2.2749 g of prepared GeP 5 The powder and 1.2175 g antimony powder were mixed evenly in a mortar, and the samples were loaded into a ball mill jar in a glove box. The sample was ball-milled for 4 hours with a ball-to-material ratio of 20:1 to obtain GeP 5 / Sb nanocomposites. Weigh 1.4 g of prepared GeP 5 / Sb powder and 0.6 g superconducting carbon were mixed evenly in a mortar, the sample was put into a ball mill jar in a glove box, and ball milled for 3 hours with a ball-to-material ratio of 10:1 to obtain GeP 5 / Sb / C nanocomposites.

[0021] Scanning electron microscope characterization results showed that the product consisted of spherical particles with a diameter between 30-50 nm. The product was used as a wo...

Embodiment 2

[0023] Weigh 0.7263g of germanium powder and 1.5487g of red P powder, mix and grind in a mortar, and put the mixed powder into a ball mill jar in a glove box. The sample was ball-milled for 4 hours with a ball-to-material ratio of 20:1 to obtain GeP 5 powder. Then it was mixed evenly with 0.487g antimony powder in a mortar, and the sample was loaded into a ball mill jar in a glove box. The sample was ball-milled for 6 hours with a ball-to-material ratio of 15:1 to obtain GeP 5 / Sb nanocomposites. Weigh 1.4 g of prepared GeP 5 / Sb powder and 0.6 g superconducting carbon were mixed evenly in a mortar, and the sample was put into a ball mill jar in a glove box, and ball milled for 4 hours with a ball-to-material ratio of 8:1 to obtain GeP 5 / Sb / C nanocomposites.

[0024] Scanning electron microscope characterization results showed that the product consisted of spherical particles with diameters between 20-40 nm. The product was used as a working electrode, and a high-purity...

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Abstract

The invention belongs to the technical field of sodium ion batteries, and in particular relates to a composite sodium ion battery negative electrode material and a preparation method thereof. The composite sodium ion battery negative electrode material is a GeP5 / Sb / C nanocomposite material. The composite sodium ion battery negative electrode material is made by ball milling. A sodium ion battery prepared by assembling metal sodium as a counter electrode with the material has a reversible specific capacity of about 516 mAh / g at a current density of 1000 mA / g, and the specific capacity can stillmaintain 505 mAh / g after 150 cycles. The electrode material has the advantages of high specific capacity, good cycle performance, rate performance, simple preparation method and is suitable for sodium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a negative electrode active material which can be used as a sodium ion battery and a preparation method thereof. Background technique [0002] Energy and the environment are two major issues facing mankind today. To achieve sustainable development and pursue a green and environmentally friendly lifestyle, it is necessary to seek and develop new energy sources, and the development of secondary batteries is considered to be one of the solutions to the problem. Lithium-ion battery systems have been widely used due to the advantages of high discharge voltage, high energy density, low self-discharge, long cycle life, and environmental friendliness. However, the global distribution of lithium resources is uneven and the reserves are small, so lithium is expensive and its use is limited. Although the energy density of sodium-ion batteries is slightly lower than tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCH01M4/362Y02E60/10
Inventor 周永宁肖娜吴晓京
Owner FUDAN UNIV