Anode for secondary battery, manufacturing method therefor, and lithium secondary battery manufactured using same

Abstract

The present invention relates to an anode for a secondary battery, a manufacturing method therefor, and a lithium secondary battery using the same, the anode comprising: an electrolytic copper foil current collector; an anode active material layer provided on one surface or both surfaces of the electrolytic copper foil current collector, and including lithium powder; and a protective layer provided on the anode active material layer, wherein the thickness of the electrolytic copper foil current collector is 2 [mu]m to 20 [mu]m, and the thickness of the anode active material layer and the protective layer provided on the electrolytic copper foil current collector is 100 [mu]m or less.

Description

technical field [0001] Unlike primary batteries (such as batteries that are discarded after one-time use), secondary batteries are rechargeable batteries, and there are many types, such as lead-acid batteries, nickel-cadmium batteries, and nickel-metal hydride batteries. Typically, batteries are named according to the material used for their electrodes, for example, a lead battery uses lead as the anode so that the lead causes a redox reaction during charge / discharge; a nickel-cadmium battery is a battery that uses cadmium as the anode; nickel metal hydride The battery is a battery that uses a nickel metal hydride alloy as an anode. [0002] The secondary lithium battery is one of the most advanced secondary batteries. Lithium ions can participate in the redox reaction of its anode. Moreover, the density of lithium metal is 0.53g / cm 3 , is the lightest alkali metal existing on the earth, and its required standard redox potential is also the lowest. In view of these character...

AI Technical Summary

Problems solved by technology

However, compared with the case of using lithium metal or lithium alloy as an anode active material, there are problems of lower capacity and lower initial charge / discharge efficiency

[0017] At the same time, if lithium metal or lithium alloy itself is used as an anode active material, it can indeed improve the electrochemical performance and have a large capacity, but the formation of a dendrite structure will cause a short circuit in the battery, which will not only shorten the battery life, but even worse, Can cause safety issues such as battery explosion

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