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    LITHIUM SECONDARY BATTERY
    1.
    发明公开
    LITHIUM SECONDARY BATTERY 审中-实审

    公开(公告)号：EP4398375A1

    公开(公告)日：2024-07-10

    申请号：EP22878891.5

    申请日：2022-10-05

    申请人： LG Energy Solution, Ltd.

    发明人： PARK, Seung Won ,  PARK, Hyun Woo ,  KWON, Yo Han ,  LEE, Jae Wook ,  JUN, Chan Soo

    IPC分类号： H01M10/42 ,  H01M4/38 ,  H01M10/052 ,  H01M4/505 ,  H01M4/525 ,  H01M4/1395 ,  H01M4/04

    CPC分类号： Y02P70/50 ,  Y02E60/10 ,  H01M10/052 ,  H01M4/04 ,  H01M4/505 ,  H01M4/38 ,  H01M4/525 ,  H01M10/42 ,  H01M4/1395

    摘要： The present invention relates to a lithium secondary battery comprising: an anode including an anode active material; a cathode including a cathode active material; a separator interposed between the anode and the cathode; and an electrolyte, wherein the anode active material includes silicon particles, the cathode active material includes a lithium manganese-based oxide represented by [chemical formula 1], the Si depth of charge, represented by the following formula (1), is 30% to 60%, and the Si depth of discharge, represented by the following formula (2), is 10% or more. Formula (1): Si depth of charge (%) = {(cathode loading amount + anode pre-lithiation capacity)/anode loading amount} ×100, and Formula (2): Si depth of discharge (%) = {(cathode loading amount + anode pre-lithiation capacity - discharge loading amount) /anode loading amount} ×100, wherein in formulae (1) and (2), the cathode loading amount is the capacity per unit area of the cathode (unit: mAh/cm2), the anode loading amount is the capacity per unit area of the anode (unit: mAh/cm2), the anode pre-lithiation capacity is the capacity per unit area of lithium (Li) intercalated into the anode by pre-lithiation (unit: mAh/cm2), and the discharge loading amount is a value obtained by dividing the discharge capacity of the secondary battery by the cathode area at the discharge cut-off voltage.

    METHOD FOR MANUFACTURING ANODE
    4.
    发明公开
    METHOD FOR MANUFACTURING ANODE 审中-公开

    公开(公告)号：EP4084131A1

    公开(公告)日：2022-11-02

    申请号：EP21775423.3

    申请日：2021-03-24

    申请人： LG Energy Solution, Ltd.

    发明人： KIM, Young Jae ,  YOO, Jung Woo ,  JUN, Chan Soo

    IPC分类号： H01M4/1395 ,  H01M4/1391 ,  H01M4/04 ,  H01M4/38 ,  H01M4/48 ,  H01M10/052 ,  H01M4/02

    摘要： Provided is a method of manufacturing a negative electrode, which includes: applying a negative electrode slurry on a negative electrode current collector and subjecting the applied negative electrode slurry to a first roll-pressing to form a negative electrode active material layer; pre-lithiating the negative electrode active material layer; and subjecting the pre-lithiated negative electrode active material layer to a second roll-pressing, wherein the negative electrode active material layer includes a silicon-based active material, and a ratio (p 1 /p 2 ) of porosity (p 1 ) of negative electrode active material layer after the first roll-pressing to porosity (p 2 ) of negative electrode active material layer after the second roll-pressing is in a range of 1.05 to 1.65.