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A psa/sio based 2 Lithium/thionyl chloride battery with /pi diaphragm

A thionyl chloride battery and separator technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of reduced battery energy density, increased battery internal resistance, battery micro-short circuit, etc., and achieves low porosity and electrical performance. Good and safe effect

Active Publication Date: 2020-03-17
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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  • A psa/sio based <sub>2</sub> Lithium/thionyl chloride battery with /pi diaphragm
  • A psa/sio based <sub>2</sub> Lithium/thionyl chloride battery with /pi diaphragm
  • A psa/sio based <sub>2</sub> Lithium/thionyl chloride battery with /pi diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

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

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

Embodiment 2

[0024] Embodiment 2 lithium / thionyl chloride battery

[0025] Composition: lithium ribbon, 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 its internal clusters are laminated.

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

[0027] Lithium / thionyl...

experiment example 1

[0029] Experimental Example 1 Structure Research of Different Diaphragms

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

[0031] Analysis of results: from figure 1 It can be seen that the surface of the TFE diaphragm is dense and the pore size is extremely small; the PI diaphragm prepared by electrospinning has a large number of interlaced fibers, forming holes of different sizes on the surface and inside; the surface layer of the PSA / PI diaphragm is evenly covered with PSA film, It has better compactness than PI film and can provide more effective physical insulation; PSA / SiO 2 / PI separator has more SiO 2 Nanoparticles embedded in the pores of PI films, PSA and SiO 2 The pores of the PI diaphragm are closed together, the porosity ...

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Abstract

The invention relates to the battery field, especially a PSA / SiO-based 2 Lithium / thionyl chloride battery with / PI diaphragm, consisting of lithium ribbon, PI diaphragm, PSA / SiO 2 / PI diaphragm, carbon film, nickel mesh, and shell. The preparation method is: the lithium strip is pressed on the nickel mesh as the negative electrode, and the carbon film is pressed on the nickel foam as the positive electrode; the PI diaphragm and PSA / SiO 2 The / PI diaphragm is made into a composite diaphragm; after the composite diaphragm and the positive electrode are dried, they are put into the case together with the negative electrode, and assembled into a laminated square lithium / thionyl chloride battery. The PSA / SiO 2 / PI diaphragm is made of nano-scale SiO by PSA 2 Attached to the surface of PI diaphragm, it has the advantages of high thermal stability, low porosity, and electrochemical performance comparable to PTFE diaphragm; therefore, the lithium / thionyl chloride battery prepared by the present invention has high safety and good electrical performance, and can It is better used in civil and aerospace fields.

Description

technical field [0001] The invention relates to the battery field, especially a PSA / SiO-based 2 / PI separator lithium / thionyl chloride battery. Background technique [0002] Lithium / thionyl chloride (Li / SOCl 2 ) battery is a lithium battery with lithium as the anode, carbon as the cathode carrier, and thionyl chloride solution of anhydrous lithium tetrachloroaluminate as the electrolyte. It is a 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 exploration, instrumentation and other fields. [0003] Although lithium / thionyl chloride batteries have the advantages of high specific energy, high specific power, and long storage life, there are still voltage hysteresis and safety problems in practical applications. Diaphragm is an important part of lithium / thionyl chloride battery. It has t...

Claims

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Application Information

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Patent Type & Authority Patents(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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