Lg Energy Solution, Ltd.

Seung Hae Hwang

Oh Byong Chae

Ye Ri Kim

Su Yeon Lee

Seo Young Jeon

A method of manufacturing a negative electrode wherein, in the pre-lithiation of a negative electrode structure including a negative electrode active material layer formed therein through electrochemical charging in a roll-to-roll manner, the negative electrode active material layer is divided into a central part and a side part. The charge current applied to the central part is higher than the charge current applied to the side part. In addition, in the method of manufacturing the negative electrode a pre-lithiation section is divided into a first section and a second section, the central part is electrochemically charged in the first section, the side part is electrochemically charged in the second section, and the central part and the side part are alternately electrochemically charged in one or more cycles.

Method of manufacturing negative electrode

An apparatus for pre-lithiating a negative electrode includes a pre-lithiation reactor having a pre-lithiation solution accommodated therein, a high-pressure chamber surrounding the pre-lithiation reactor, wherein an internal air pressure of the high-pressure chamber is configured to exceed atmospheric pressure, at least one lithium metal counter electrode disposed in the pre-lithiation solution, the lithium metal counter electrode being disposed to face a negative electrode receivable in the pre-lithiation solution in a state that the lithium metal counter electrode is spaced apart from the negative electrode by a predetermined interval, and a charge and discharge unit being connectable to the negative electrode and the lithium metal counter electrode to provide a circuit.

Apparatus for pre-lithiation of negative electrode and method for pre-lithiation of negative electrode

A device for pre-lithiation including a pre-lithiation reactor sequentially divided into an impregnation section, a pre-lithiation section, and an aging section. The pre-lithiation reactor accommodates a pre-lithiation solution through which a negative electrode structure is moved. A negative electrode roll is arranged outside the pre-lithiation solution, and the pre-movement negative electrode structure is wound. A lithium metal counter electrode is arranged in the pre-lithiation solution of the pre-lithiation section, and is arranged to be spaced apart from the negative electrode structure to face the negative electrode structure moving in the pre-lithiation solution. A charging and discharging unit is connected to the negative electrode structure and connected to the lithium metal counter electrode. The lithium metal counter electrode is tilted and a separation distance between the lithium metal counter electrode and the negative electrode structure gradually increases in the moving direction of the negative electrode structure.

Device for pre-lithiation of negative electrode and method for pre-lithiation of negative electrode

Disclosed is a method of preparing a negative electrode which includes the steps of: forming a cell by sequentially stacking a preliminary negative electrode, a separator, and a lithium metal, immersing the cell in an electrolyte solution comprising a lithium salt and a solvent; applying a current after the cell is immersed in the electrolyte solution containing the lithium salt and the solvent, separating the preliminary negative electrode from the cell after removing the cell immersed in the electrolyte solution from the electrolyte solution, washing the separated preliminary negative electrode, performing a first drying on the washed preliminary negative electrode at room temperature, and performing a second drying on the first dried preliminary negative electrode at a temperature ranging from 30° C. to 70° C. in a vacuum state.

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Daejeon, South Korea

Seung Hae Hwang