Corrosion-resistant metal lithium negative current collector and preparation method and application thereof

A current collector and metal lithium technology, which is applied in the field of metal lithium negative electrode current collectors and its preparation, can solve the problems of insulation corrosion products and electrode structure collapse, corrosion, battery failure, etc., to inhibit dendrite growth, promote uniform distribution, The effect of stabilizing the solid-liquid interface

Inactive Publication Date: 2019-09-27
TIANJIN UNIV
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  • Application Information

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Problems solved by technology

Among them, polysulfide additives are extremely corrosive. Traditional copper current collectors will be severely corroded when applied to electrolytes containing polysulfide additives, resulting in insulating corrosion products and electrode structure collapse, leading to battery failure.

Method used

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  • Corrosion-resistant metal lithium negative current collector and preparation method and application thereof
  • Corrosion-resistant metal lithium negative current collector and preparation method and application thereof
  • Corrosion-resistant metal lithium negative current collector and preparation method and application thereof

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] In a glove box filled with argon, a corrosion-resistant metal titanium current collector and a comparative copper foil current collector were used as negative electrodes, metal lithium was used as a reference electrode and a counter electrode, and Celgard 2325 was used as a diaphragm to assemble a coin cell. The electrolytic solution used in the present invention is composed of a certain concentration of lithium salt, an organic solvent and a small amount of electrolytic solution additives. Wherein the lithium salt is lithium bistrifluoromethylsulfonylimide (LiTFSI), the solvent is 1,3-dioxane / ethylene glycol dimethyl ether (DOL / DME), and the electrolyte additive is 1wt% lithium nitrate ( LiNO 3 ) and 0.1M lithium polysulfide (Li 2 S 8 ). Use an electrochemical workstation (CHI 760E) to perform a cyclic voltammetry scan test on the b...

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Abstract

The invention discloses a corrosion-resistant metal lithium negative current collector. The metal lithium negative electrode current collector is made of a three-dimensional porous foam titanium material. The preparation process of the current collector mainly comprises the following steps: firstly, cutting a three-dimensional porous foam titanium current collector into squares; secondly, polishing and brightening the surface and corners of the foamed titanium current collector by using abrasive paper, and soaking the polished foamed titanium current collector in 0.5-1M hydrochloric acid solution for 6-12 hours to remove surface impurities; and finally, cleaning the current collector with acetone, ethanol and deionized water, and drying the current collector for later use. The current collector is used in a lithium-sulfur battery containing a corrosive polysulfide additive.

Description

technical field [0001] The invention belongs to the technical field of metal battery materials, and in particular relates to a corrosion-resistant metal lithium negative electrode current collector, a preparation method and an application thereof. Background technique [0002] In recent years, with the increasing demand for portable electronic devices and electric vehicles, traditional lithium-ion batteries can no longer meet the needs of electronic products and electric vehicles for battery energy. Lithium metal, with its high theoretical specific capacity (3860mAh g -1 ) and low reduction potential (-3.04V), it is considered to be an ideal anode material for the next generation of high specific energy metal batteries. [0003] However, there are still many serious problems in the practical application of lithium metal. For example, the metal lithium dendrites generated during the cycle can easily pierce the separator, resulting in safety hazards caused by battery short c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/80H01M4/134H01M4/1395H01M10/052
CPCH01M4/661H01M4/808H01M4/1395H01M4/134H01M10/052Y02E60/10
Inventor 罗加严张欣悦
Owner TIANJIN UNIV
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