A kind of protection method of lithium ion battery electrode

A lithium-ion battery and electrode technology, which is applied in the repair/maintenance of secondary batteries, secondary batteries, circuits, etc., can solve problems such as affecting the electrical performance of batteries, uneven film layer, and hindering ion transport and transmission.

Active Publication Date: 2021-08-17
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The formation of the protective film on the electrode surface can be realized by artificial protective film, that is, by adding additives to the electrolyte, the electrode material and the electrolyte react at the solid-liquid phase interface during the charging and discharging process to form a layer covering the electrode material. The passivation layer on the surface is called "solid electrolyte interface film" (solid electrolyte interface, SEI film), but this method is difficult to control the thickness and uniformity of the film
The content of its participation in the reaction is also difficult to control. If the SEI film is too thick, it will hinder the transport of ions and affect the electrical performance of the battery. However, if the SEI film is too thin or the film is not uniform, it is difficult to protect the electrode.

Method used

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  • A kind of protection method of lithium ion battery electrode
  • A kind of protection method of lithium ion battery electrode
  • A kind of protection method of lithium ion battery electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In a glove box filled with argon gas, DMC and EC were mixed with 5mL electrolyte at a volume ratio of 7:3, and lithium salt lithium hexafluorophosphate (LiPF 6 ), the concentration of the lithium salt was 1mol / L, stirred until the lithium salt was completely dissolved, and 2.5wt.% lithium difluorophosphate was added to obtain an electrolyte.

[0044] When making a battery, put the positive electrode material in the middle of the positive electrode shell, add a certain volume of 30 μL of electrolyte on the surface of the positive electrode material, and then add 60 μL of fluorine-containing solvent 1,1,2,2-tetrafluoroethyl-2,2 ,3,3-Tetrafluoropropyl ether (C 5 h 4 f 8 O) On the surface of the positive electrode material ternary material NCM622, the lithium salt additive is precipitated, and then add a layer of Celgard2500 diaphragm, negative electrode material lithium metal sheet, gasket, shrapnel, cover the negative electrode case, and seal the battery with a sealing ...

Embodiment 2

[0047] In a glove box filled with argon, mix DMC and PC with 5 mL of electrolyte at a volume ratio of 7:3, and slowly add lithium bistrifluoromethanesulfonylimide (LiTFSI) so that the concentration of lithium salt is 1 mol / L , stirred until the lithium salt was completely dissolved, and 2wt.% lithium difluorophosphate was added to obtain an electrolyte.

[0048] When making a battery, put the positive electrode material in the middle of the positive electrode shell, add a certain volume of 30 μL of electrolyte on the surface of the positive electrode material, and then add 45 μL of fluorine-containing solvent 1,1,2,2-tetrafluoroethyl-2,2 ,3,3-Tetrafluoropropyl ether (C 5 h 4 f 8 O) On the surface of the positive electrode material ternary material NCM622, the lithium salt additive is precipitated, and then add a layer of Celgard2500 diaphragm, negative electrode material lithium metal sheet, gasket, shrapnel, cover the negative electrode case, and seal the battery with a sea...

Embodiment 3

[0052] In a glove box filled with argon, mix EMC and PC with 5mL electrolyte at a volume ratio of 7:3, and slowly add lithium salt lithium bisfluorosulfonimide (LiFSI) to make the concentration of lithium salt 1mol / L , stirred until the lithium salt was completely dissolved, and 1wt.% lithium difluorophosphate was added to obtain an electrolyte.

[0053] When making a battery, put the positive electrode material in the middle of the positive electrode shell, add a certain volume of 30 μL of electrolyte on the surface of the positive electrode material, and then add 30 μL of fluorine-containing solvent 1,1,1,3,3,3-hexafluoroisopropyl methyl ether (C 4 h 4 f 6 O) On the surface of the positive electrode material ternary material NCM622, the lithium salt additive is precipitated, and then add a layer of Celgard2500 diaphragm, negative electrode material lithium metal sheet, gasket, shrapnel, cover the negative electrode case, and seal the battery with a sealing machine.

[005...

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PUM

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Abstract

The invention provides a method for protecting electrodes of lithium-ion batteries, which comprises the following steps: immersing electrode materials in an electrolyte solution, then adding a halogenated ether solvent into the electrolyte solution, depositing a lithium salt additive on the surface of the electrodes, and then charging the electrodes Discharge to form an electrode protective film; the electrolyte includes a non-aqueous solvent, lithium salt and additives; the halogenated ether solvent is one or more of fluoroethers, chloroethers and brominated ethers . The invention utilizes the strong interaction between the fluorine-containing solvent and the non-aqueous solvent, so that the additive is “salted out” from the solvent and deposited on the surface of the electrode to form a uniform and stable protective layer, which participates in protecting the electrode during the cycle of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a method for protecting electrodes of lithium ion batteries. Background technique [0002] Since the commercialization of lithium-ion batteries, due to its environmental protection, high efficiency and other advantages, it has been widely used, such as pure electric vehicles, notebook computers, mobile phones and other portable energy storage devices. Therefore, the performance stability of lithium-ion batteries has been raised. new challenge. [0003] In order to improve the storage and stability of the battery, it is necessary to protect the electrodes of the lithium-ion battery. The protection method of the lithium-ion battery electrode is usually to form a protective film stably on the surface of the electrode, so that the electrode is not corroded by the electrolyte, and then protected. The stability of electrode materials improves the cycle performance of lit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42H01M10/0525
CPCH01M10/0525H01M10/4235Y02E60/10
Inventor 陈士庆代文慧骆浩刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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