Lg Energy Solution, Ltd.

Lg Chem, Ltd

Sol Nip Lee

Song Taek Oh

Hyeok Moo Lee

Ji Eun Lee

Young Geun Choi

Hyung Man Cho

Hyo Sik Kim

Jeong Gil Kim

Jeong Ho Ha

Jeong Min Yang

The present invention relates to a battery cell for evaluating an internal short circuit, and a method for evaluating using the battery cell, wherein an internal short circuit state of a battery cell can be easily induced and, at the same time, an effective internal short circuit evaluation is possible, and the battery cell comprising: first and second electrodes which comprise a coated region on which an electrode mixture layer is coated on a metal current collector and a non-coated region on which an electrode mixture layer is not coated, and which comprise first and second electrode tabs which protrude in one direction from the coated region and do not have an electrode mixture layer coated thereon.

Battery cell for testing internal short circuit, and method for testing internal short circuit of battery cell by using same

Provided herein are a negative electrode and a secondary battery including the same. In particular, the negative electrode includes: a current collector; a first active material layer including first active material particles and disposed on the current collector; and a second active material layer including second active material particles and disposed on the first active material layer, in which a lithium ion diffusion rate of the second active material particles is two to three times that of the first active material particles.

Negative electrode for secondary battery

The present invention relates to a method of preparing an electrode for a lithium secondary battery and an electrode for a lithium secondary battery prepared thereby, wherein, since the method may suppress the migration of a binder and may uniformly control the distribution of the binder in the electrode by forming a plurality of negative electrode active material layers and allowing a drying condition of each of the negative electrode active material layers to be different, the method may improve life characteristics by improving adhesion between a negative electrode active material and a current collector and may improve charging characteristics by reducing interfacial resistance of the negative electrode.

Method of preparing electrode for lithium secondary battery and electrode for lithium secondary battery prepared thereby

A method of preparing an electrode for a secondary battery, including: (i) a process of preparing a current collector in which through-pores or holes are formed and an electrode slurry containing an electrode active material; (ii) a process of bringing a shielding film into close contact with one surface of the current collector to shield pores or holes on the one surface of the current collector; (iii) a process of coating the electrode slurry on the other surface of the current collector to which the shielding film is not attached, and primarily drying to prepare an interim electrode; (iv) a process of removing the shielding film from the interim electrode; and (v) a process of secondarily drying the interim electrode to prepare the electrode.

Method of preparing electrode using current collector having through-pores or holes

The present disclosure provides an electrode for a secondary battery including a current collector having an electrode tab protruding outward to at least one outer peripheral side thereof, an electrode mixture layer formed on the current collector, and an electrode protecting layer applied on the electrode mixture layer, wherein the electrode protecting layer includes a conductive material and a binder to supplement conductivity of the electrode mixture layer and prevent separation of the electrode mixture layer from the current collector.

Electrode for secondary battery including electrode protecting layer

Disclosed herein is an electrode for a secondary battery including an electrode mixture layer including an electrode active material on one surface or both surfaces of a current collector, wherein the electrode mixture layer includes a plurality of fine holes recessed toward the current collector from a vertical cross-sectional surface, and each of the fine holes is a horn-shaped hole whose diameter is gradually decreased from the vertical cross-sectional surface toward the current collector in the electrode mixture layer.

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Daejeon, South Korea

Sol Nip Lee