公开(公告)号：US20230115280A1

公开(公告)日：2023-04-13

申请号：US17914928

申请日：2022-02-10

Applicant: LG Energy Solution, Ltd.

Inventor： Tae Gu Yoo ,  Wang Mo Jung ,  Chi Ho Jo ,  Ji Hye Kim ,  Hae Jung Jung ,  Jong Wook Heo

IPC: H01M4/525 ,  H01M4/505 ,  H01M4/62

Abstract: A sacrificial positive electrode material, a positive electrode comprising the same, and a lithium secondary battery having the positive electrode are disclosed herein. In some embodiments, a sacrificial positive electrode material includes a lithium cobalt oxide represented by the following Chemical Formula 1, wherein the sacrificial positive electrode active material has a defect formation energy of metal (M) of −4.0 to −8.5 eV, calculated using density functional theory (DFT): LixCo(1-y)MyO4   [Chemical Formula 1] M is at least one selected from the group consisting of Al, Fe, Zn, Ti, W, Mg, Ge and Si, pa x and y are 5≤x≤7 and 0.05≤y≤0.6. When the defect formation energy of the metal is controlled within a specific range, a high initial charging/discharging efficiency is realized during initial charging/discharging, and the amount of gas additionally generated at the later time of charging/discharging is reduced. Thus, stability and the charging/discharging performance of a battery is improved.

公开(公告)号：US20230086038A1

公开(公告)日：2023-03-23

申请号：US17941208

申请日：2022-09-09

Applicant: LG Energy Solution, Ltd.

Inventor： Jong Wook Heo ,  Wang Mo Jung ,  Chi Ho Jo ,  Tae Gu Yoo ,  Jin Tae Hwang ,  Hae Jung Jung ,  Hyeon Jin Cho

IPC: H01M4/525 ,  H01M4/505 ,  H01M4/36 ,  H01M4/62 ,  H01M4/131 ,  C01G53/00

Abstract: A positive electrode active material powder for a lithium secondary battery, which includes a lithium composite transition metal oxide in the form of a single particle consisting of one nodule, or a pseudo-single crystal, which is a composite of 30 or less nodules, where the positive electrode active material powder satisfies Expression 1: 0.5≤Dmean33 dpress/D50≤3.Where Dmean is an average particle diameter of the nodules as measured using an electron backscatter diffraction (EBSD) pattern analyzer, dpress is a press density measured after 5 g of the positive electrode active material powder is input into a circular mold with a diameter of 2 cm and pressurized at a pressure of 2000 kgf, and D50 is a value corresponding to a cumulative volume of 50% in the particle size distribution of the positive electrode active material powder.

公开(公告)号：US20220328838A1

公开(公告)日：2022-10-13

申请号：US17615982

申请日：2020-09-28

Applicant: LG Energy Solution, Ltd.

Inventor： Tae Gon Kim ,  Sin Young Park ,  Bo Ram Lee ,  Hyung Man Cho ,  Tae Gu Yoo ,  Min Kwak

IPC: H01M4/62 ,  H01M10/052

Abstract: An electrode includes an electrode active material layer, wherein the electrode active material layer includes an electrode active material and a conductive agent, wherein the conductive agent includes graphene, and a carbon nanotube structure in which 2 to 5,000 single-walled carbon nanotube units are bonded to each other, and the carbon nanotube structure is included in an amount of 0.01 wt % to 0.5 wt % in the electrode active material layer. A secondary battery including the same is also provided.