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    Pre-lithiation using lithium metal and inorganic composite layer
    6.
    发明授权
    Pre-lithiation using lithium metal and inorganic composite layer 有权

    公开(公告)号：US11316156B2

    公开(公告)日：2022-04-26

    申请号：US16541737

    申请日：2019-08-15

    申请人： LG CHEM, LTD.

    发明人： Sang Wook Woo ,  Eun Kyung Kim ,  Yoon Ah Kang ,  Jun Hyuk Song ,  Oh Byong Chae

    IPC分类号： H01M4/485 ,  H01M4/04 ,  H01M4/02

    摘要： A method of pre-lithiating a negative electrode for a secondary battery, including: dispersing a lithium metal powder, an inorganic material powder and a binder in a solvent to prepare a mixed solution; and applying the mixed solution to the negative electrode to form a lithium metal-inorganic composite layer on the negative electrode, thereby forming the pre-lithiated negative electrode. Also, a method for pre-lithiating a negative electrode having a high capacity by a simple process. Further, a negative electrode for a secondary battery manufactured through the pre-lithiation method provided in the present invention has an improved initial irreversibility, and secondary batteries manufactured using such a negative electrode for a secondary battery have excellent charge/discharge efficiency.

    Method for manufacturing negative electrode for lithium secondary battery
    8.
    发明授权
    Method for manufacturing negative electrode for lithium secondary battery 有权

    公开(公告)号：US11205797B2

    公开(公告)日：2021-12-21

    申请号：US16466585

    申请日：2018-04-26

    申请人： LG CHEM, LTD.

    发明人： Yoonah Kang ,  Eun Kyung Kim ,  Sangwook Woo

    IPC分类号： H01M10/052 ,  H01M4/04 ,  H01M4/1391 ,  H01M4/38 ,  H01M4/485 ,  H01M4/62 ,  H01M4/133

    摘要： A method for manufacturing a negative electrode for a lithium secondary battery. A negative electrode for a lithium secondary battery is manufactured while forming a composite of lithium metal and a negative electrode active material through a rolling process In the case of the lithium secondary battery to which the negative electrode containing such a composite is applied, when the battery starts to operate, the negative electrode active material is pre-lithiated, and thus charging/discharging process proceeds in the state where the lithium alloy is already formed on the negative electrode, thereby showing an effect of reducing initial irreversible phases.

    Negative electrode active material and method of preparing the same
    9.
    发明授权
    Negative electrode active material and method of preparing the same 有权

    公开(公告)号：US11152621B2

    公开(公告)日：2021-10-19

    申请号：US15558631

    申请日：2016-04-15

    申请人： LG Chem, Ltd.

    发明人： Hyun Wook Kim ,  Eun Kyung Kim ,  Sun Young Shin

    IPC分类号： H01M4/133 ,  H01M4/587 ,  C01B32/23 ,  C01B32/21 ,  H01M4/62 ,  H01M4/66 ,  H01M4/02

    摘要： Since a surface of the artificial graphite of the negative electrode active material according to the present invention is modified with nitrogen, dispersibility in an aqueous system may be improved and accordingly, affinity between a binder and the negative electrode active material is increased to increase the adhesive strength of an electrode. Also, since the surface of the artificial graphite is modified with nitrogen, there is an effect of maintaining a high battery capacity. Furthermore, in the method of preparing a negative electrode active material according to the present invention, since an oxygen-containing functional group is connected to the artificial graphite by a mild oxidation process, the nitrogen may be easily attached to the artificial graphite so that the negative electrode active material becomes an electrical conductor by maintaining original crystallinity while having a hydrophilic property. Thus, excellent battery efficiency may be achieved.