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Cathode, preparation method thereof and lithium battery employing cathode

A positive electrode and thionyl chloride battery technology, applied in the field of electrochemistry, can solve the problems of catalytic activity attenuation, insoluble in thionyl chloride electrolyte, etc., and achieve the effect of improving discharge voltage, good electrochemical performance, and good catalytic stability

Active Publication Date: 2016-06-29
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The macrocyclic structure in the graphene molecular structure cannot be dissolved in thionyl chloride electrolyte, not only has good catalytic performance, but also can replace conventional macrocyclic compound catalysts, and solve the problem of macrocyclic compound catalysts commonly used in the prior art The problem of serious decay of catalytic activity during storage

Method used

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  • Cathode, preparation method thereof and lithium battery employing cathode
  • Cathode, preparation method thereof and lithium battery employing cathode
  • Cathode, preparation method thereof and lithium battery employing cathode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The preparation method of the positive electrode sheet: acetylene black, PTFE accounting for 8% of the mass of acetylene black, cobalt and nitrogen-doped graphene (Co-N-G) accounting for 1% of the mass of acetylene black are mixed with absolute ethanol, then heated and foamed, rolled Roll forming to obtain a positive electrode sheet.

[0066] In this example, cobalt phthalocyanine CoPc was not added during the preparation of the positive electrode sheet.

[0067] The lithium / thionyl chloride battery is made by using the positive electrode sheet of this embodiment, and the injected electrolyte is LiAlCl of 1.5mol / L 4 / SOCl 2 . The prepared battery was tested at 25mA·cm by a discharge test system at room temperature. -2 Under the condition of discharge to 2.0V.

[0068] After the preparation of the lithium / thionyl chloride battery obtained in this example is completed, at 25mA·cm -2 Under the conditions of the discharge test, the discharge results are as follows fig...

Embodiment 2

[0070] Except that the addition of cobalt and nitrogen-doped graphene accounted for 3% of the mass of acetylene black, other preparation and detection methods and conditions were the same as in Example 1.

[0071] In this example, cobalt phthalocyanine CoPc was not added during the preparation of the positive electrode sheet.

[0072] After the preparation of the lithium / thionyl chloride battery obtained in this example is completed, at 25mA·cm -2 Under the conditions of the discharge test, the discharge results are as follows figure 2 , with 3% Co-N-G added in the positive electrode, its discharge capacity is 1580mAh g -1 , 490mAh·g more than pure acetylene black (AB) -1 , the discharge voltage is 150mV higher than AB.

Embodiment 3

[0074] Except that the addition of cobalt and nitrogen-doped graphene accounted for 5% of the mass of acetylene black, other preparation and detection methods and conditions were the same as in Example 1.

[0075] In this example, cobalt phthalocyanine CoPc was not added during the preparation of the positive electrode sheet.

[0076] After the preparation of the lithium / thionyl chloride battery obtained in this example is completed, at 25mA·cm -2 Under the conditions of the discharge test, the discharge results are as follows image 3 , with 5% Co-N-G added in the positive electrode, its discharge capacity is 1700mAh g -1 , 610mAh·g more than pure acetylene black (AB) -1 , The discharge voltage is 160mV higher than AB.

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Abstract

The invention provides a cathode, a preparation method thereof and a lithium / thionyl chloride battery employing the cathode. Macrocyclic structure compounds, namely transition metal and nitrogen-doped graphene are added to the cathode as catalysts; and the lithium / thionyl chloride battery prepared by the cathode has relatively excellent electrochemical property, so that the discharge voltage and the discharge capacity of the lithium / thionyl chloride battery prepared by the cathode are significantly improved; the catalytic activity retention rate of the lithium / thionyl chloride battery is significantly improved; the catalytic activity retention rate is obviously superior to that of the lithium / thionyl chloride battery prepared by the cathode of a common macrocyclic compound catalyst (such as cobalt phthalocyanine CoPc) in the prior art; the prepared battery is discharged to 2.0V with a discharge test system at a room temperature under the current density condition of 25mA.cm<-2>; the specific discharge capacity reaches 1850mAh.g<-1>; and the discharge voltage is improved by over 180mV.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and relates to a positive electrode, a preparation method thereof, and a lithium battery using the positive electrode, in particular to a positive electrode comprising a transition metal and nitrogen-doped graphene catalyst, a preparation method thereof, and a lithium battery using the positive electrode. Thionyl chloride battery. Background technique [0002] Lithium / thionyl chloride (Li / SOCl 2 ) batteries have the characteristics of high specific energy and long life, which make them widely used in long-life instruments. 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 a porous carbon cathode for reduction: 2SOCl 2 +4e - →S↓+SO 2 +4Cl - , carbon as SOCl 2 The carrier is also the catalytic SOCl 2 reduced catalyst, but SOCl 2 The reduction reaction at the solid-liquid interface is very slow, an...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/1393H01M4/88
CPCH01M4/133H01M4/1393H01M4/88Y02E60/10Y02E60/50
Inventor 袁中直李碧梅徐瑛刘金成
Owner EVE ENERGY CO LTD
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