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Interface modifying method of lithium metal battery anode

A lithium metal battery, lithium metal technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of dead lithium, dendrite formation, etc., and achieve the effect of easy operation, easy operation, and good cycle performance

Inactive Publication Date: 2017-05-31
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a surface modification method for the negative electrode of a lithium metal battery, which is used to solve the problem of forming dendrites and dead lithium during the charging process of the lithium metal battery

Method used

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  • Interface modifying method of lithium metal battery anode
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  • Interface modifying method of lithium metal battery anode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1. Preparation of Heterogeneous Copper-Modified Lithium Electrode by Liquid Phase Chemical Replacement Method

[0030] In an inert atmosphere, dissolve anhydrous copper chloride in a propylene carbonate solvent to prepare a 0.05 mol / L reaction solution. At room temperature (25 degrees Celsius), immerse the lithium sheet in the reaction solution and let it stand for 30 minutes. Minutes, after the reaction is complete, take out the lithium sheet, remove the residual reaction solution adsorbed on the surface, wash 3 times with dimethyl carbonate, and vacuum dry to obtain a lithium metal electrode with a conductive metal copper film on the surface.

[0031] The performance of the modified lithium electrode can be characterized by a Li|Li symmetric battery, and the electrolyte is 1M LiPF 6 EC-DEC, the diaphragm is Celgard 2400, at a constant current of 0.5 mA / cm 2 Charge and discharge, each charge and discharge process lasts for 3h, such as figure 1 As shown, the v...

Embodiment 2

[0032] Example 2: Preparation of heterogeneous antimony-modified lithium electrodes by liquid-phase chemical displacement method

[0033] In an inert atmosphere, anhydrous antimony chloride was dissolved in acetonitrile solvent to prepare a reaction solution of 0.01 moles per liter. According to the method in Example 1, a heterogeneous antimony-modified lithium electrode was prepared and assembled as Li|Li Symmetrical battery, the battery performance test information such as image 3 As shown, the modified lithium electrode obviously exhibits less voltage polarization and long-term cycle stability, and the voltage polarization is still stable at ±48mV after 350h cycle.

Embodiment 3

[0034]Example 3: Heterogeneous zinc-modified lithium metal electrode prepared by liquid-phase chemical displacement method

[0035] In an inert atmosphere, anhydrous zinc chloride was dissolved in propylene carbonate solvent to prepare a 0.05 mol / L reaction solution. According to the method in Example 1, a heterogeneous zinc-modified lithium electrode was prepared and assembled as Li |Li symmetric cells, exhibiting small voltage polarization (±30 mV) and excellent long-term cycling stability.

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Abstract

The invention discloses an interface modifying method of a lithium metal battery anode. The surface-modified metal lithium is used for a lithium metal battery. The interface modifying method has the advantages that a solution containing dissimilar metal ions, such as copper, manganese, cobalt, nickel, iron, zinc, gold, silver and platinum, is used as a treatment solution, and a dissimilar metal film is produced at the surface of a lithium piece in situ by a liquid phase chemical replacement method; the dissimilar metal film can be stabilized at the metal lithium / electrolyte surface, the production of lithium dendrites is effectively inhibited, the polarizing of electrochemistry is reduced, the charging property of the lithium metal anode is improved, and the property of the lithium metal battery is improved; the technique is simple, the implementing is easy, the scaled production is easy, and the application prospect is broad.

Description

technical field [0001] The invention relates to a method for modifying the negative electrode interface of a lithium metal battery, which belongs to the field of lithium secondary batteries and also belongs to the technical field of energy materials. Background technique [0002] With the rapid development of new energy technologies, especially the potential market demand in the fields of consumer electronics, electric vehicles, and large-scale energy storage power stations, there is an urgent need to develop rechargeable batteries with higher energy density, higher power density, and longer life. Put the energy storage device. As the most advanced secondary battery at present, since its commercialization by Sony in 1991, lithium-ion battery has become an important direction of research by scientists all over the world due to its advantages such as high energy density and long cycle life. Objectively speaking, in the past two decades, lithium-ion batteries have indeed made ...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/62
CPCH01M4/139H01M4/623Y02E60/10
Inventor 钱江峰万国佳艾新平杨汉西
Owner WUHAN UNIV
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