Positive electrode containing nitrogen-doping graphene, preparation method of positive electrode and lithium battery adopting positive electrode

A nitrogen-doped graphene and graphene technology, applied in the field of electrochemistry, can solve problems such as the difference in the mechanism of action, the influence of battery performance, and the effect of different functions, and achieve the effect of high catalytic activity and improved electrochemical performance.

Active Publication Date: 2016-06-15
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, nitrogen-doped graphene plays different roles in different systems, and the mechanism of action is also very different. In lithium-ion batteries and supercapacitors, nitrogen-doped graphene is directly used as a battery material, while in fuel cells Even if it is used as a battery material in several different systems, or as a catalyst at the same time, the difference in active sites will have a great impact on battery performance
Moreover, the nitrogen-doped graphene used in the prior art has no specific composition restrictions, and nitrogen-doped graphene has not been applied to lithium / thionyl chloride batteries, so the research on nitrogen-doped graphene in lithium / thionyl chloride The application in batteries and its mechanism of action in lithium / thionyl chloride batteries are of great significance

Method used

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  • Positive electrode containing nitrogen-doping graphene, preparation method of positive electrode and lithium battery adopting positive electrode
  • Positive electrode containing nitrogen-doping graphene, preparation method of positive electrode and lithium battery adopting positive electrode
  • Positive electrode containing nitrogen-doping graphene, preparation method of positive electrode and lithium battery adopting positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] The preparation method of the positive electrode sheet: mixing acetylene black, polytetrafluoroethylene accounting for 8% of the mass of the acetylene black, nitrogen-doped graphene accounting for 1% of the mass of the acetylene black and absolute ethanol, then heating and foaming, and roll forming to obtain positive plate.

[0070] A lithium / thionyl chloride battery is made by using the positive electrode sheet of this embodiment, and the injected electrolyte is 1.5 mol·L -1 LiAlCl 4 / SOCl 2 . Use the discharge test system to test the battery at room temperature at 25mA·cm -2 discharge to 2.0V under the condition of the current density.

[0071] The discharge results of the lithium / thionyl chloride battery obtained in this example are as follows figure 1 . from figure 1 It can be seen that the discharge capacity of the battery without catalyst is 1000mAh g -1 , the battery with 1% nitrogen-doped graphene catalyst (N-G) achieves a discharge capacity of 1178mAh g...

Embodiment 2

[0073] Except that the addition amount of nitrogen-doped graphene accounts for 3% of the mass of acetylene black, other preparation and detection methods and conditions are the same as those in Example 2.

[0074] The discharge results of the lithium / thionyl chloride battery obtained in this example are as follows figure 2 . from figure 2 It can be seen that the discharge capacity of the battery without catalyst is 1000mAh g -1 , the discharge midpoint voltage is 2.68V; the discharge capacity of the battery containing 3% N-G catalyst is as high as 1600mAh g -1 , the midpoint voltage is as high as 2.79V, the catalytic effect is obvious, and the discharge capacity is increased by 600mAh g -1 , the midpoint voltage is increased by 110mV.

Embodiment 3

[0076] Except that the addition amount of nitrogen-doped graphene accounts for 5% of the mass of acetylene black, other preparation and detection methods and conditions are the same as those in Example 1.

[0077] The discharge results of the lithium / thionyl chloride battery obtained in this example are as follows image 3 . from image 3 It can be seen that the discharge capacity of the battery without catalyst is 1000mAh g -1 , the discharge midpoint voltage is 2.68V; the discharge capacity of the battery containing 5% N-G catalyst is as high as 1640mAh·g -1 , the midpoint voltage is as high as 2.81V, the catalytic effect is very obvious, and the discharge capacity is increased by 640mAh g -1 , the midpoint voltage is increased by 130mV.

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Abstract

The invention provides a positive electrode containing nitrogen-doping graphene for a lithium/thionyl chloride battery, a preparation method of the positive electrode and a lithium/thionyl chloride battery adopting the positive electrode. Nitrogen-doping graphene is added into a positive electrode of the lithium/thionyl chloride battery to be used as a catalyst, so that the lithium/thionyl chloride battery prepared by adopting the positive electrode is more excellent in electromechanical performance, the discharge voltage and discharge capacity of the lithium/thionyl chloride battery are remarkably increased, a discharge test system is discharged to 2.0V at a current density condition of 25mA/cm<2> at the normal temperature, the discharge specific capacity reaches up to 1700mAh/g or more, the discharge voltage is 2.83V, the discharge specific capacity is approximately 600mAh/g higher than that of the lithium/thionyl chloride battery with no catalyst in the positive electrode, and the discharge voltage is 100mV higher than that of the lithium/thionyl chloride battery with no catalyst in the positive electrode.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and relates to a positive electrode for lithium / thionyl chloride, a preparation method thereof and a lithium battery using the positive electrode, in particular to a lithium / thionyl chloride positive electrode comprising a nitrogen-doped graphene catalyst, and preparation thereof A method and a lithium / thionyl chloride battery using the positive electrode. Background technique [0002] Lithium / Thionyl Chloride (Li / SOCl 2 ) The battery has the characteristics of high specific energy, long storage and service life, small size and stable discharge platform, which makes it widely used in industrial production, such as aerospace, daily life, especially in long-life instruments and meters. Applications. In this battery, liquid SOCl 2 It is both an electrolyte and a cathode active material, so it has a high specific energy. SOCl 2 Adsorption in porous carbon cathode for reduction reaction: 2SOCl 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/62H01M4/1393
CPCH01M4/1393H01M4/583H01M4/623H01M4/625Y02E60/10
Inventor 袁中直李碧梅徐瑛刘金成
Owner EVE ENERGY CO LTD
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