Negative electrode for lithium secondary battery, method of manufacturing same and lithium secondary battery using same

Abstract

The invention relates to a negative electrode for a lithium secondary battery that can ensure a high energy density, a long-life characteristic, and stability by forming a film on a negative electrodefor a lithium secondary battery and thus suppressing dendrites during electrodeposition, a method of manufacturing the same, and a lithium secondary battery using the same. The method of manufacturing the negative electrode for a lithium secondary battery according to the present invention includes preparing a sulfur dioxide-based sodium molten salt and forming a protective layer on the surface of a current collector by immersing the current collector in the sulfur dioxide-based sodium molten salt.

Description

technical field [0001] The present invention relates to lithium secondary batteries, and more particularly, to devices capable of suppressing dendrites during charge and discharge by forming a film on a cathode for lithium secondary batteries, thereby ensuring high energy density, long life, and stability. A cathode for a lithium secondary battery, a manufacturing method thereof, and a lithium secondary battery using the cathode. Background technique [0002] While the demand for secondary batteries is increasing along with the growth of the IT mobile market, the application fields of secondary batteries are gradually expanding to the market of electric vehicles and energy storage systems. In particular, in order to realize batteries with high energy density such as those used in electric vehicles, it is necessary to develop next-generation lithium batteries with higher energy density than lithium-ion batteries (maximum energy density reaches 250Wh / kg), which is most in line...

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Problems solved by technology

In addition, when the dendrites thus formed continue to grow until they penetrate the separator and come into contact with the anode, an internal short circuit occurs, leading to a phenomenon in which the battery explodes.

Second, since lithium, which is an alkaline metal, has a high reactivity with water, even when some ppm of water is contained in the electrolyte, lithium can react with water to generate heat and gas, which can lead to gas explosion inside the battery. Swells, causing problems with battery stability

Third, since lithium is soft and has low mechanical strength, its handling is very low when used without additional surface treatment

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