Lithium/thionyl chloride battery based on PSA/SiO2/PI separator

A technology of thionyl chloride batteries and diaphragms, which is applied to battery components, circuits, electrical components, etc., can solve the problems of battery energy density reduction, battery internal resistance increase, battery micro-short circuit, etc., and achieve low porosity and electrical performance. Good and safe effect

Active Publication Date: 2019-04-19
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of studies have shown that the use of PI separators with a thickness of more than 90 μm in the battery will increase the internal resistance of the battery, resulting in a decrease in the energy density of the battery; There will be a short circuit of the battery
The researchers of the present invention have found through experiments that the Li / SOCl 2 After the battery was left on hold for 72 hours, the open circuit voltage of the battery dropped from 3.65V to 3.63V, which proved that the battery had an internal micro-short circuit, thus indicating that the PI separator with a thickness of 40 μm still had structural defects.

Method used

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  • Lithium/thionyl chloride battery based on PSA/SiO2/PI separator
  • Lithium/thionyl chloride battery based on PSA/SiO2/PI separator
  • Lithium/thionyl chloride battery based on PSA/SiO2/PI separator

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1 PSA / SiO 2 / PI diaphragm

[0023] Preparation method: Place 96g of dimethylacetamide (DMAC) solvent in a beaker and add 0.6g of nano-SiO 2 Then it was placed under ultrasonic stirring for about 5 minutes, and then 3.4 g of polyarylsulfone amide (PSA) was added with ultrasonic stirring for about 30 minutes. Afterwards, part of the obtained solution was evenly coated on the surface of the PI diaphragm, and heated in a blast drying oven at a temperature of 90-100°C for 6 hours to obtain PSA / SiO 2 / PI diaphragm.

Embodiment 2

[0024] Example 2 Lithium / Thionyl Chloride Battery

[0025] Composition: lithium belt, PI diaphragm, PSA / SiO 2 / PI diaphragm, carbon film, nickel mesh, shell; the carbon film is made of Ketjen black powder; the shell is made of square stainless steel, and the internal clusters are laminated.

[0026] Preparation method: press the lithium belt on the nickel mesh as the negative electrode, and press the carbon film on the foamed nickel as the positive electrode; the PSA / SiO 2 / PI separator is wrapped in the positive electrode of the battery, PI separator is wrapped in PSA / SiO 2 A composite film is formed on the surface of the / PI diaphragm; the composite film and the positive electrode are heated at a temperature of 100-130°C for 48-72h under a vacuum of 0.3KPa, and then packed into the case together with the negative electrode, and assembled into a rated capacity of 10Ah Laminated rectangular lithium / thionyl chloride battery.

[0027] Lithium / thionyl chloride battery with rated capacit...

experiment example 1

[0029] Experimental example 1 Structure study of different diaphragms

[0030] Experimental method: take PTFE diaphragm, PI diaphragm, PSA / PI diaphragm and PSA / SiO prepared by the present invention 2 / PI diaphragm was scanned by electron microscope to observe the tightness and pores of the diaphragm. The scanning results are as follows figure 1 Shown:

[0031] Result analysis: from figure 1 It can be seen that the surface of the TFE membrane is dense and the pore size is extremely small; the PI membrane prepared by electrospinning has a large number of fibers interlaced and formed on the surface and inside of the membrane; the surface of the PSA / PI membrane is evenly covered with the PSA membrane, It has better density than PI film and can provide more effective physical insulation; PSA / SiO 2 / PI diaphragm has more SiO 2 Nano particles are embedded in the holes of PI film, PSA and SiO 2 At the same time, the pores of the PI diaphragm are closed, and the porosity of the PI diaphragm ...

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Abstract

The invention relates to the field of batteries, in particular to a lithium / thionyl chloride battery based on a PSA / SiO2 / PI separator. The lithium / thionyl chloride battery comprises a lithium strip, aPI separator, a PSA / SiO2 / PI separator, a carbon film, a nickel mesh and a shell. The method comprises the following steps of: pressing a lithium strip on a nickel mesh as a negative electrode, and pressing a carbon film on a nickel foam as a positive electrode; forming the PI separator and the PSA / SiO2 / PI separator into a composite separator; and drying the composite separator and the positive electrode, and assembling the negative electrode together with the composite separator and the positive electrode into the shell to form a laminated square lithium / thionyl chloride battery. The PSA / SiO2 / PI separator is made by attaching the nano-scale SiO2 to the surface of the PI separator by using the PSA, has the high thermal stability, low porosity, and the electrochemical performance comparableto that of the PTFE separator; and the lithium / thionyl chloride battery has high safety and good electrical performance, and can be better applied in civil and aerospace fields.

Description

Technical field [0001] The invention relates to the field of batteries, in particular to a PSA / SiO 2 / PI diaphragm lithium / thionyl chloride battery. Background technique [0002] Lithium / thionyl chloride (Li / SOCl 2 ) The battery is a lithium battery with lithium as the anode, carbon as the cathode carrier, and anhydrous lithium tetrachloroaluminate thionyl chloride solution as the electrolyte. It is the battery with the highest working voltage and specific energy in the practical battery series. The working voltage can reach 3.6V, and the specific energy can reach 590W·h / Kg; it is widely used in aerospace, navigation equipment, geological prospecting, instrumentation and other fields. [0003] Although lithium / thionyl chloride batteries have the advantages of high specific energy, high specific power, and long storage life, they still have voltage lag and safety problems in practical applications. The diaphragm is an important part of the lithium / thionyl chloride battery. It has t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/457
CPCH01M50/403H01M50/446Y02E60/10
Inventor 谭思平魏俊华石斌陈铤黄晔
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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