Lg Energy Solution, Ltd.

Song Yi Han

Ji Hoon Ryu

Hyun Min Kim

Dae Soo Kim

Ki Won Sung

Young Deok Kim

In the present invention, a slurry for a second cathode mixture is applied to both edge regions of an electrode sheet holing portion during storage of an electrode sheet having a high content of nickel, wherein the edge regions are vulnerable to moisture penetration and high in rolling reduction ratio and the slurry contains a cathode active material more resistant to rolling than that applied to the center region of the holding portion, whereby the reactivity of nickel and moisture is suppressed as much as possible to improve the lifespan characteristics of the battery.

High-nickel electrode sheet having reduced reactivity with moisture and manufacturing method therefor

An electrode assembly comprises: a first unit electrode in which a plurality of first electrodes entirely made of a first electrode mixture having a solid shape are connected to each other; a second unit electrode in which a plurality of second electrodes entirely made of a second electrode mixture having a solid shape are connected to each other; a separator interposed between the first unit electrode and the second unit electrode; and an electrode tab comprising a plurality of first electrode tab provided on the first unit electrode and a plurality of second electrode tab provided on the second unit electrode.

Method for manufacturing a secondary battery

The present invention relates to an electrode sheet comprising: a first cathode mixture layer which is formed in a central portion of a holding part and contains a first cathode active material of lithium nickel cobalt manganese oxide; and a second cathode mixture layer which is formed at one end or both ends of the first cathode mixture layer and contains a second cathode active material lower in nickel content than the first cathode active material, wherein a rolling density b of the second cathode mixture layer is lower than a rolling density a of the first cathode mixture layer, whereby the electrode sheet has the effect of improving the energy density while suppressing a reaction with water.

High-nickel electrode sheet and method for manufacturing same

The present invention relates to a method of manufacturing a secondary battery with improved resistance. According to the present invention, since the electrode assembly with succinonitrile interposed at the interface between the electrode and the separator is manufactured and then laminated, a high-pressure process is not required during lamination compared to the prior art, thereby improving processability, and since succinonitrile is dissolved in the electrolyte solution, it exhibits an effect of improving the resistance of the battery.

Method for manufacturing secondary battery with improved resistance

The electrode comprises: a plurality of unit electrodes formed by connecting a plurality of electrodes made of an electrode mixture having a solid shape to each other; a separator interposed between the plurality of unit electrodes; and an electrode tab attached to the unit electrode, wherein the electrode tab comprises first and second electrode tabs, which are respectively attached to the unit electrodes and have different specific resistance.

Electrode assembly and comprising connected plurality of unit electrodes

An electrode assembly comprising a first unit electrode in which a plurality of first electrodes entirely made of a first electrode mixture having a solid shape are connected to each other; a second unit electrode in which a plurality of second electrodes entirely made of a second electrode mixture having a solid shape are connected to each other; a separator interposed between the first unit electrode and the second unit electrode; and an electrode tab comprising a plurality of first electrode tab provided on the first unit electrode and a plurality of second electrode tab provided on the second unit electrode.

Secondary battery and method for manufacturing the same

The present invention relates to an electrode assembly. The electrode comprises: a plurality of unit electrodes formed by connecting a plurality of electrodes made of an electrode mixture having a solid shape to each other; a separator interposed between the plurality of unit electrodes; and an electrode tab attached to the unit electrode, wherein the electrode tab comprises first and second electrode tabs, which are respectively attached to the unit electrodes and have different specific resistance.

Electrode assembly and method for manufacturing the same

The present invention relates to a method for analyzing a degree of impregnation of an electrolyte of an electrode in a battery cell, the method comprising: a battery cell manufacturing step (S) of preparing a battery cell by injecting an electrolyte into a battery cell including an electrode to be evaluated; a step of charging/discharging the battery cell several times and obtaining a capacity-voltage profile for each cycle (S); a step of obtaining a differential capacity (dV/dQ) curve obtained by differentiating the capacitance-voltage profile for each cycle with respect to the capacity (S); and a step of, in the differential capacity curve, determining a cycle at which behavior becomes the same as a time point when impregnation is sufficiently performed (S).

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Daejeon, South Korea

Song Yi Han