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Anode of high-energy lithium/thionyl chloride battery and preparation method of anode

A thionyl chloride battery, high-energy technology, applied in battery electrodes, electrode carriers/current collectors, circuits, etc., can solve problems such as increasing internal resistance, reducing battery load capacity, etc., to increase reaction sites, increase capacity and working voltage. , the effect of increasing the capacity

Inactive Publication Date: 2013-06-26
武汉中原长江科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, glass fiber yarn is also an insulating material, which also has the problem of increasing internal resistance and reducing battery load capacity.

Method used

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  • Anode of high-energy lithium/thionyl chloride battery and preparation method of anode
  • Anode of high-energy lithium/thionyl chloride battery and preparation method of anode
  • Anode of high-energy lithium/thionyl chloride battery and preparation method of anode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides a positive electrode of a high-energy lithium / thionyl chloride battery. The positive electrode is composed of 10 g of acetylene black, 1.2 g of polytetrafluoroethylene emulsion, 57 g of absolute ethanol, and 0.8 g of conductive carbon fiber. The diameter of carbon fiber is 7μm~11μm, and the length is 1~3mm. PTFE emulsion is 60% water emulsion. Acetylene black was battery grade, and absolute ethanol was analytically pure.

[0030] The present embodiment also provides the preparation method of the positive electrode of high-energy lithium / thionyl chloride battery, and it comprises the following steps:

[0031] 1) Mixing powder: Mix 10g acetylene black, 1.2g polytetrafluoroethylene emulsion, 57g absolute ethanol, and 0.8g conductive carbon fiber to form a paste;

[0032] 2) Carbon bag molding: Extrude the above paste into a cylinder with an extruder and a molding die;

[0033] 3) Initial drying: Dry the obtained cylinder at a drying temperature ...

Embodiment 2

[0041] Embodiment 2 is substantially the same as Embodiment 1, except that the positive electrode of this embodiment is composed of 10 g of acetylene black, 1.0 g of polytetrafluoroethylene emulsion, 55 g of absolute ethanol, and 0.9 g of conductive carbon fiber. Other preparation methods are the same as in Example 1, and a high-energy lithium / sub-battery (model ER14505) is produced.

[0042] The discharge capacity test of the ER14505 high-energy lithium / sub-battery was performed at room temperature with a constant resistance of 200Ω to 2.0V. The results are as follows: image 3 . Depend on image 3 It can be seen that the discharge capacity of the ER14250 high-energy lithium / sub-battery is 2.11Ah.

Embodiment 3

[0044] Embodiment 3 is substantially the same as Embodiment 1, except that the positive electrode of this embodiment is composed of 10 g of acetylene black, 0.9 g of polytetrafluoroethylene emulsion, 56 g of absolute ethanol, and 1.0 g of conductive carbon fiber. Other preparation methods are the same as in Example 1, and a high-energy lithium / sub-battery (model ER26500) is produced.

[0045] The discharge capacity test of the ER26500 high-energy lithium / sub-battery was carried out at room temperature at a constant current of 50 mA to 2.0V. The results are as follows: Figure 4 . Depend on Figure 4 It can be seen that the discharge capacity of the ER26500 high-energy lithium / sub-battery is 6.4Ah.

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Abstract

The invention provides an anode of a high-energy lithium / thionyl chloride battery and a preparation method of the anode. The anode of the high-energy lithium / thionyl chloride battery contains acetylene black, a teflon emulsion, absolute ethyl alcohol and conductive carbon fiber, wherein the mass ratio of the acetylene black to the teflon emulsion to the absolute ethyl alcohol is 10: (0.8-1.2): (53-57), and the carbon fiber accounts for 8-12 percent of the acetylene black by mass. By virtue of the excellent conductivity of the carbon fiber, the charge transfer situation of active particles on the surface of the carbon anode is remarkably improved, the transmission of reaction ions and ionic charges is dredged, the anode electron conduction capability is improved, the passivation and deactivation process is retarded and the capacity and the working voltage of the lithium / thionyl chloride battery is improved, and therefore the high-energy lithium / thionyl chloride battery is very suitable for a battery using environment at -40-71 DEG C.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a positive electrode of a high-energy lithium / thionyl chloride battery and a preparation method thereof. Background technique [0002] The negative electrode active material of lithium / thionyl chloride battery is metal lithium, the positive electrode active material is thionyl chloride, and the carbon positive electrode is the carrier of the electrochemical reaction of thionyl chloride, and the battery reaction is: 4Li+2SOCl 2 =4LiCl+SO 2 +S, due to the formation of insoluble solid products LiCl and S, as the discharge progresses, the surface and inner pores of carbon are gradually covered and blocked by insoluble solid products, which gradually passivates and deactivates the carbon positive electrode, leading to the end of battery life . [0003] The carbon positive electrode preparation method in the current technology is to mix acetylene black, polytetrafluoroethyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/139
CPCY02E60/10
Inventor 王亚琴刘思思王维艾彬朱敏雷梦雅马福芸刘玮李丹
Owner 武汉中原长江科技发展有限公司
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