A kind of passivation lithium powder and its preparation method and application

A technology for passivating lithium and lithium salts, which is applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of high complexity of equipment, large size of passivated lithium powder, and uniform dispersion of lithium powder, so as to improve the pre-lithium The effects of globalization, reduction of production costs, and resource saving

Active Publication Date: 2021-06-25
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of preparing lithium powder by mechanical shearing "micro-emulsification" requires high-speed stirring device and heating device, and the equipment is complicated. Lithium powder increases the difficulty of uniform dispersion of lithium powder in the pre-lithiation process

Method used

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  • A kind of passivation lithium powder and its preparation method and application
  • A kind of passivation lithium powder and its preparation method and application
  • A kind of passivation lithium powder and its preparation method and application

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preparation example Construction

[0030] The invention provides a preparation method of passivated lithium powder, comprising the following steps: using lithium salt as an electrolyte, a lithium sheet as an anode, and an inert metal as a cathode, performing electroplating in the presence of an organic solvent and a fluorine-containing compound, Obtain passivated lithium powder.

[0031] In the present invention, the preparation of the passivated lithium powder is preferably carried out in an electroplating device, such as figure 1 As shown, a metal lithium sheet is used as an anode, and an inert metal is used as a cathode.

[0032] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0033] In the present invention, the lithium salt preferably includes LiPF 6 , LiAsF 6 One or more of , LiTFSI and LiFSI. In the present invention, the fluorine-containing compound preferably includes fluoroethylene carbo...

Embodiment 1

[0048] use as figure 1 In the electroplating device shown, in the glove box, the mixed solvent of EC:DEC volume ratio = 1:1 is used as the organic solvent, and LiPF 6 As the electrolyte, the copper sheet is the cathode, the lithium sheet is the anode, and FEC is the additive. At a current density of 0.1mA·cm -2 Under the conditions of electroplating for 3h, a passivated lithium powder film loaded on the copper sheet is obtained; among them, LiPF 6 , The dosage ratio of FEC and organic solvent is 1mol: 0.1mol: 1L;

[0049] Transfer the copper sheet loaded with passivated lithium powder film to DOL solvent, and ultrasonically peel it off for 20 minutes to obtain passivated lithium powder slurry, and place the passivated lithium powder slurry in an argon-protected glove box or a dry room for batteries Solvent DOL was volatilized to obtain passivated lithium powder.

[0050] The scanning electron microscope picture of gained passivation lithium powder is as follows figure 2 A...

Embodiment 2

[0052] In the glove box, use the mixed solvent of EC:DEC:DMC volume ratio = 1:1:1 as the organic solvent, LiPF 6 As the electrolyte, the copper sheet is the cathode, the lithium sheet is the anode, and FEC is the additive. At a current density of 0.05mA·cm -2 Under the conditions of electroplating for 1h, a passivated lithium powder film loaded on the copper sheet is obtained; among them, LiPF 6 , The dosage ratio of FEC and organic solvent is 1mol: 0.05mol: 1L;

[0053] The obtained copper sheet loaded with passivated lithium powder film was transferred to a DOL solvent, and ultrasonically peeled off for 10 minutes to obtain a passivated lithium powder slurry, which was placed in an argon-protected glove box to evaporate the solvent DOL, Obtain passivated lithium powder.

[0054] The structure of the obtained passivated lithium powder is a spherical particle of a core-shell structure with metal lithium as the core and lithium fluoride / lithium oxide composite; the scanning e...

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Abstract

The invention provides a passivated lithium powder and a preparation method and application thereof, which belong to the technical field of lithium ion batteries. The preparation method of passivated lithium powder provided by the present invention comprises the following steps: using lithium salt as electrolyte, lithium sheet as anode, and inert metal as cathode, performing electroplating in the presence of organic solvents and fluorine-containing compounds to obtain passivation Lithium powder. The passivated lithium powder prepared by the method provided by the invention is placed in the air with a humidity below 20% for 1 month, and the structure of the passivated lithium powder does not change significantly; it is used for pre-lithiation / complementation of graphite negative electrodes and silicon carbon negative electrodes. Lithium, the first cycle Coulombic efficiency can be increased to more than 99.8%; pre-lithiated graphite negative electrode and silicon carbon negative electrode and LiCoO 2 The first-cycle coulombic efficiency of the full battery assembled with the positive electrode can be increased to more than 98%, and the energy consumption is low, easy to operate and can be prepared continuously, and is suitable for mass production.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a passivated lithium powder and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, and good safety performance, and have been widely used in portable electronic products and electric vehicles. At present, the negative electrodes of commercial lithium-ion batteries are mainly graphite and silicon carbon materials. However, the lithium intercalation potential of graphite and silicon carbon materials is lower than that of organic solvents such as ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), and diethyl carbonate (DEC) in the electrolyte. Therefore, these solvents will be reduced during the charging process to form a solid electrolyte membrane (SEI) composed of lithium oxide, lithium fluoride and organic lithium salt compounds on the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/38
CPCH01M4/134H01M4/1395H01M4/382Y02E60/10
Inventor 唐永福黄建宇张利强李小梅李彦帅
Owner YANSHAN UNIV
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