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Method for inhibiting generation of lithium dendrite on surface of lithium metal

A lithium metal and lithium dendrite technology, applied in the field of electrode material processing, can solve problems such as irreversible loss of capacity, uneven deposition, battery short circuit, etc., and achieve the effects of improving volume utilization, prolonging battery life, and inhibiting lithium dendrites

Active Publication Date: 2018-05-22
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are potential safety hazards in using lithium sheets as the negative electrode of batteries.
During the discharge process, the lithium flakes will dissolve into lithium ions, and during the charging process, the lithium ions will be reduced to metallic lithium. During this reduction process, due to thermodynamic reasons, lithium will be deposited unevenly and have dendrites during the reduction process. Lithium dendrites may become "dead lithium", causing irreversible loss of capacity, and may also pierce the separator, short-circuit the battery, and cause safety problems

Method used

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  • Method for inhibiting generation of lithium dendrite on surface of lithium metal
  • Method for inhibiting generation of lithium dendrite on surface of lithium metal
  • Method for inhibiting generation of lithium dendrite on surface of lithium metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh the crystalline manganese nitrate-Mn(NO 3 ) 2 ·6H 2 O mass, and quickly transferred to a pre-dried weighing bottle. Above-mentioned weighing bottle is placed in glove box, in glove box, in above-mentioned weighing bottle, solution is added dropwise (solution is LiPF 6 Dissolved in an organic solvent, the organic solvent is EC / DEC (volume ratio = 1:1), and in the solution, LiPF 6 The concentration is 1M). After the manganese nitrate crystals are completely dissolved, molecular sieves are added to the weighing bottle to remove excess water to complete the configuration of the electrolyte, wherein the concentration of manganese ions is 0.05mol / L.

[0035] In the glove box, the lithium sheet is cut into a disc shape and compacted, and the lithium sheet with a smooth surface is immersed in the electrolyte of the above configuration. Wait for about 2 minutes, and after the surface of the lithium sheet is covered with a uniform black bright solid film, use DME solve...

Embodiment 2

[0042] LiMn 2 o 4 , acetylene black, and PTFE are mixed and stirred evenly according to the mass ratio of 80:10:10, rolled evenly on a glass plate to form a film and cut into discs with a diameter of 12mm; ℃ in a vacuum drying oven and dried overnight to be the positive electrode material of the battery. The lithium metal was treated according to the method of Example 1, and the treated lithium sheet was used as the negative electrode of the battery. with LiPF 6 Solute dissolved in EC and DEC (volume ratio = 1:1) as electrolyte (1mol L -1 ), the glass fiber membrane was assembled into a half-cell as the separator, as the experimental group.

[0043] Using untreated lithium flakes as the negative electrode, the LiMn prepared by the above method 2 o 4 The electrode was positive and assembled into another half-cell as a control. The performance of the two sets of batteries was tested under the following test conditions: 2C current rate, 55°C, charge and discharge window 3....

Embodiment 3

[0047] Weigh the mass of crystalline manganese acetate on a balance and transfer quickly to a dry weighing bottle. Above-mentioned weighing bottle is placed in glove box, in glove box, in above-mentioned weighing bottle, solution is added dropwise (solution is LiPF 6 Dissolved in an organic solvent, the organic solvent is DMC / PC (volume ratio = 1:1), and in the solution, LiPF 6 The concentration is 1M). After the manganese acetate crystals are completely dissolved, molecular sieves are added to the weighing bottle to remove excess water to complete the configuration of the electrolyte, wherein the concentration of manganese ions is 0.01mol / L.

[0048] In the glove box, the lithium sheet is cut into a disc shape and compacted, and the lithium sheet with a smooth surface is immersed in the electrolyte of the above configuration. Wait for about 1 minute, and after the surface of the lithium sheet is covered with a uniform black bright solid film, use DME solvent to clean the re...

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Abstract

The invention relates to a method for inhibiting generation of a lithium dendrite on the surface of a lithium metal. The method comprises the following steps of dissolving manganese salt crystal intoan electrolyte containing a lithium salt and an organic solvent to obtain the electrolyte containing manganese ions, wherein the manganese salt crystal is one or more of manganese nitrate, manganese acetate and manganese sulfate, and the lithium salt is selected from lithium hexafluorophosphate, lithium perchlorate or LiTFSI; and making the smooth surface of the lithium metal in contact with the electrolyte containing the manganese ions until a bright black film is formed on the surface of the lithium metal. According to the method, generation of the lithium dendrite can be significantly inhibited; when the treated lithium metal is taken as an electrode, the cycle performance and the stability are greatly improved; and the method is simple in preparation technology and low in cost and hasrelatively high application value.

Description

technical field [0001] The invention relates to the technical field of electrode material processing, in particular to a method for inhibiting the generation of lithium dendrites on the surface of lithium metal. Background technique [0002] With the increasing popularity of portable electronic products such as notebook computers and mobile phones, as well as the development of electric vehicles and energy storage batteries, people have put forward higher requirements on the energy density, service life and cost of power supplies. Lithium-ion batteries with small size, light weight, environmental friendliness and high specific energy have been widely used and are gradually replacing traditional batteries, such as zinc-manganese batteries, lead-acid batteries, nickel-cadmium batteries, and metal hydride batteries. As a new generation of high-energy power supply, lithium-ion batteries have been developed in response to the needs of economic development, resource utilization an...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M10/42H01M10/052
CPCH01M4/382H01M10/052H01M10/4235Y02E60/10
Inventor 郭少华周豪慎李翔
Owner NANJING UNIV
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