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Lithium-carbon fluoride battery with ultra-low concentration electrolyte and preparation method

A carbon fluoride battery, ultra-low concentration technology, applied in the field of materials, can solve the problems of slow ion movement, increased electrolyte viscosity, performance degradation, etc., to achieve the effects of reducing side reactions, reducing costs, and reducing viscosity

Active Publication Date: 2022-08-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the salt will increase the viscosity of the electrolyte, making the ion movement slow, and the performance will be reduced instead. In addition, the free lithium ions in the electrolyte with too low concentration are too few to fully contact with the active material, which is not conducive to its charge and discharge performance. , which greatly limits the application of lithium-ion batteries

Method used

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  • Lithium-carbon fluoride battery with ultra-low concentration electrolyte and preparation method
  • Lithium-carbon fluoride battery with ultra-low concentration electrolyte and preparation method
  • Lithium-carbon fluoride battery with ultra-low concentration electrolyte and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The present embodiment provides an ultra-low concentration lithium salt electrolyte and its application in a lithium-carbon fluoride battery, the details are as follows:

[0042] Fluorinated artificial graphite, Super P and PVDF were dispersed in NMP solvent at a mass ratio of 7:2:1, mixed uniformly and ground into a slurry, the slurry was coated on aluminum foil, and then transferred to a vacuum drying oven at 80 °C Vacuum dry for 12 hours, use a cutting machine to cut the required size of the pole piece, use it as the positive electrode, use metal lithium as the negative electrode for the counter electrode, use DMSO to make up the electrolyte, and use the PP separator for Ar with water and oxygen content below 1ppm. Lithium-ion batteries were assembled in a gas atmosphere glove box.

[0043] After the prepared lithium ion battery was sealed with a sealing machine, the charge-discharge performance was tested, and the charge-discharge curve was as follows figure 1 As s...

Embodiment 2

[0045] The present embodiment provides an ultra-low concentration lithium salt electrolyte and its application in a lithium-carbon fluoride battery, the details are as follows:

[0046] Fluorinated artificial graphite, Super P and PVDF were dispersed in NMP solvent at a mass ratio of 7:2:1, mixed uniformly and ground into a slurry, the slurry was coated on aluminum foil, and then transferred to a vacuum drying oven at 80 °C Vacuum dry for 12 hours, use a cutting machine to cut the required size of the pole piece, use it as the positive electrode, use metal lithium as the negative electrode for the counter electrode, use EC / DMC (v:v=1:1) as the electrolyte, and use PP Lithium-ion batteries were assembled in an Ar gas atmosphere glove box with both water and oxygen content below 1 ppm.

[0047] After the prepared lithium ion battery was sealed with a sealing machine, the charge-discharge performance was tested. The discharge curve is shown in the figure below. figure 2 As show...

Embodiment 3

[0049] The present embodiment provides an ultra-low concentration lithium salt electrolyte and its application in a lithium-carbon fluoride battery, the details are as follows:

[0050] Fluorinated artificial graphite, Super P and PVDF were dispersed in NMP solvent at a mass ratio of 7:2:1, mixed uniformly and ground into a slurry, the slurry was coated on aluminum foil, and then transferred to a vacuum drying oven at 80 °C Vacuum dry for 12 hours, use a cutting machine to cut the required size of the pole piece, use it as the positive electrode, use metal lithium as the negative electrode for the counter electrode, and use DMSO / EC / DMC (v:v:v=2:1:1) as the electrolytic Lithium-ion batteries were assembled with PP separators in an Ar gas atmosphere glove box with both water and oxygen content below 1 ppm.

[0051] After the prepared lithium ion battery was sealed with a sealing machine, the charge-discharge performance was tested. The discharge curve is shown in the figure belo...

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Abstract

The invention relates to a lithium-carbon fluoride battery with an ultra-low concentration electrolyte and an ultra-low concentration electrolyte. The electrolyte in the lithium-carbon fluoride battery is an ultra-low concentration electrolyte, the concentration of the lithium salt in the ultra-low concentration electrolyte is 0-0.18mol / L, and the viscosity of the ultra-low concentration electrolyte is 0-2.00 mPa s; during the discharge process of the lithium-carbon fluoride battery, fluoride ions are extracted from the carbon fluoride, and form lithium fluoride with the lithium ions of the lithium salt, so that the lithium-carbon fluoride battery forms a double ion Battery. At the same time, the low-concentration electrolyte has low cost, and the low concentration greatly reduces the viscosity of the electrolyte, reduces the side reactions during the discharge process, and the battery can obtain better performance.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a lithium-carbon fluoride battery with an ultra-low concentration electrolyte and a preparation method. Background technique [0002] A lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During charging and discharging, Li + Intercalation and deintercalation back and forth between two electrodes: when charging, Li + It is extracted from the positive electrode and inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. Lithium-ion batteries have the advantages of high specific energy, high charge-discharge efficiency and long life, and are currently one of the most promising chemical power sources. [0003] At present, the lithium ion battery electrolyte commo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0569H01M10/0568H01M10/058H01M10/0525
CPCH01M10/0569H01M10/0568H01M10/058H01M10/0525Y02P70/50
Inventor 王丽平陈鹏宇陈施颖
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA