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Method for manufacturing sodion battery negative pole material and negative pole and sodion battery

A sodium ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as sharp drop in cycle stability, environmental hazards, and capacity fading, and achieve reduced energy consumption, high production efficiency, and simplified The effect of the preparation process

Inactive Publication Date: 2013-02-06
HYB BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese invention patent with the application number 201210038789.0 discloses "a negative electrode material for sodium ion batteries". This patent uses a sodium alloy that can form an alloy with sodium as the negative electrode material. Although the initial capacity of the alloy material is high, as the cycle progresses, The volume expansion of the alloy has brought about a sharp decrease in cycle stability. For example, after the Sn / acetylene black composite material is alloyed with sodium, the sodium removal capacity has dropped from 440mAh / g in the second week to 221mAh / g when the cycle reaches 20 weeks. Capacity decay rate reaches 50%
The Chinese invention patent with the patent number ZL01822503.9 discloses a "synthesis method of lithium transition metal sulfide", which is mainly a method for preparing lithium transition metal sulfide such as lithium iron sulfide. , need to use a large amount of organic liquid to extract and recover products, which brings great harm to the environment. It is necessary to improve the method of synthesizing sulfide, and the lithium iron sulfide is only limited to be used in lithium-ion batteries

Method used

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  • Method for manufacturing sodion battery negative pole material and negative pole and sodion battery
  • Method for manufacturing sodion battery negative pole material and negative pole and sodion battery
  • Method for manufacturing sodion battery negative pole material and negative pole and sodion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0042] (1) According to the chemical formula Na 0.5 Nb 2 , Na in the glove box 2 S. Elemental niobium and elemental sulfur are weighed according to the stoichiometric ratio, and they are ground and mixed with an agate mortar for 1 hour. In order to supplement the loss of elemental sulfur during the heating process, an excess of 2wt% elemental sulfur is added before powder grinding, and the powder is mixed uniformly. Put it into a mold, and apply 2 tons of pressure to press it into a highly dense reaction precursor sample, put it into a dried quartz tube, close the valve connected to the opening of the quartz tube, and remove it from the glove box;

[0043] (2) Connect the quartz tube containing the sample in step (1) into a vacuum device. When the vacuum reaches 0.05 Torr, use a mixed flame of acetylene and oxygen to seal the quartz tube, and then place the quartz tube containing the sample Put the tube into the muffle furnace and raise the temperature to 700°C in 20 hours a...

Embodiment 2

[0047] (1) According to the chemical formula Na 0.3 Nb 2 , Na in the glove box 2 S. Elemental niobium and elemental sulfur are weighed according to the stoichiometric ratio, and they are ground and mixed for 1.5 hours with an agate mortar. In order to supplement the loss of elemental sulfur during the heating process, an excess of 3wt% elemental sulfur is added before powder grinding, and the powder is mixed uniformly. Put it into a mold, and apply 3 tons of pressure to press it into a highly dense reaction precursor sample, put it into a dried quartz tube, close the valve connected to the quartz tube, and remove it from the glove box;

[0048] (2) Connect the quartz tube containing the sample in step (1) into a vacuum device. When the vacuum reaches 0.06 Torr, use a mixed flame of acetylene and oxygen to seal the quartz tube, and then place the quartz tube containing the sample Put the tube into the muffle furnace and raise the temperature to 680°C in 15 hours and keep it a...

Embodiment 3

[0052] (1) According to the chemical formula Na 0.25 Nb 2 , Na in the glove box 2 S. Elemental niobium and elemental sulfur are weighed according to the stoichiometric ratio, and they are ground and mixed for 1.5 hours with an agate mortar. In order to supplement the loss of elemental sulfur during the heating process, an excess of 1wt% elemental sulfur is added before powder grinding, and the powder is mixed uniformly. Put it into a mold, and apply 1 ton of pressure to press it into a highly dense reaction precursor sample, put it into a dried quartz tube, close the valve connected to the quartz tube, and remove it from the glove box;

[0053] (2) Connect the quartz tube containing the sample in step (1) into a vacuum device. When the vacuum reaches 0.07 Torr, use a mixed flame of acetylene and oxygen to seal the quartz tube, and then place the quartz tube containing the sample Put the tube into the muffle furnace and raise the temperature to 720°C in 17 hours and keep it a...

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Abstract

The invention relates to a method for manufacturing a sodion battery negative pole material and a negative pole and a sodion battery. The sodion battery negative pole material is reacted with Na2S, elemental niobium and elemental sulfur by one step to obtain a sulfide negative pole material via a high-temperature solid phase method; since NbS2 can form a NaxNbS2 compound (x is larger than or equal to zero and less than or equal to 1) during an electrochemistry charging / discharging process; Nb<4+> / Nb<3+> are for reversible disoxidation and oxygenation, therefore, manufactured sodion negative pole material is provided with higher charging / discharging capacity and better circulation performance, and further manufactured sodion battery negative pole and sodion battery are provided with higher charging / discharging capacity and better circulation performance; and in addition, the method is simple in process and easy to operate, high in production efficiency, producing capacity and purity; an organic solvent is not required to serve as an extractant, a manufacture and required production line is compatible with the conventional liquid lithium ion battery production line, and the conventional production line can be directly used.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to a negative electrode material of a sodium ion battery, a preparation method of the negative electrode and a sodium ion battery. Background technique [0002] Since Sony commercialized lithium-ion batteries in the 1990s, lithium-ion batteries have been widely used in various electronic products and military communication equipment as the most suitable energy storage materials, and have made great contributions to the convenience of human life. . The research on high-performance and high-capacity lithium-ion battery electrode materials has become a research hotspot and focus in the fields of electrochemistry, physics and material science. With the in-depth research on these materials and the maturity of the technology, the application field of lithium-ion batteries is wider, but behind these gratifying research results, there is a serious problem of cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/1397H01M10/36
CPCY02E60/122Y02E60/10
Inventor 廖友好李伟善邱显焕冯岸柏冯洪亮
Owner HYB BATTERY
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