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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, circuits, etc., can solve the problems of electrode material shedding, large volume change, battery performance attenuation, etc.

Inactive Publication Date: 2019-05-17
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Abstract
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Problems solved by technology

During the charging and discharging process, sodium ions cause the volume expansion of the electrode material through continuous intercalation / extraction, causing the electrode material to be pulverized, causing the electrode material to fall off from the current collector and agglomerate, resulting in a sharp decline in battery performance
Among them, antimony sulfide as a negative electrode material for sodium-ion batteries has attracted widespread attention due to its high theoretical capacity (946 mAh / g), but the electrochemical performance of antimony sulfide is limited by its poor conductivity and the intercalation / extraction of sodium ions. Constraints of large defects in volume change during the

Method used

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  • Sodium ion battery negative electrode material and preparation method thereof
  • Sodium ion battery negative electrode material and preparation method thereof
  • Sodium ion battery negative electrode material and preparation method thereof

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Embodiment 1

[0041] The negative electrode material of the sodium ion battery is a composite material formed of a nitrogen-doped carbon layer coated with an antimony sulfide nanowire.

[0042] The preparation method of the negative electrode material of the sodium ion battery comprises the following specific steps:

[0043] (1) Preparation of antimony sulfide nanowires: First, 0.228g of antimony chloride and 0.48g of sodium sulfide nonahydrate were dissolved in 20mL of ethylene disulfide

[0044] In alcohol, obtain the ethylene glycol solution of antimony chloride and the ethylene glycol solution of sodium sulfide nonahydrate;

[0045] The ethylene glycol solution was dropped into the ethylene glycol solution of sodium sulfide nonahydrate for mixing, and the obtained mixed solution was stirred for 3 hours to form a uniform solution, and the solution was placed in a 50 mL autoclave with a polytetrafluoroethylene substrate , heated at 200°C for 10h, cooled to room temperature, collected the...

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Abstract

The invention belongs to the technical field of sodium ion batteries, and particularly relates to a sodium ion battery negative electrode material and a preparation method thereof. The sodium ion battery negative electrode material is a composite material formed by coating an antimony sulfide nanowire with a nitrogen-doped carbon layer; the obtained composite material is used for a sodium ion battery, and by virtue of the controllable synthesis method and a stable structure, the electrochemical capacity and the cycling performance of the sodium ion battery are effectively improved, the defectsof an existing electrode material are overcome, and the cycling performance of the battery is effectively improved. The method comprises the following steps of synthesizing the antimony sulfide nanowire through a one-step hydrothermal method firstly, then enabling dopamine to be uniformly loaded on the antimony sulfide nanowire through a reaction, and finally obtaining the composite material formed by coating the antimony sulfide nanowire with the nitrogen-doped carbon layer through heat treatment.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to a negative electrode material of a sodium ion battery and a preparation method thereof. Background technique [0002] In recent years, lithium-ion batteries have been successfully used in various portable electronic devices, electric vehicles, and large-scale energy storage systems. However, factors such as insufficient lithium-ion reserves on the earth, uneven storage distribution, and high prices limit the practical application of lithium-ion batteries. further development. With the development of science and technology in modern society, the demand for energy storage batteries is increasing. Therefore, the development of energy storage materials with high energy efficiency, environmental friendliness and abundant storage is a necessary condition for sustainable development. Metal sodium is low in cost and abundant in reserves. Sodium-ion batteries hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y40/00
CPCY02E60/10
Inventor 董玉成林叶茂
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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