公开(公告)号：US20220223831A1

公开(公告)日：2022-07-14

申请号：US17565031

申请日：2021-12-29

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yusuke YOSHITANI ,  Takashi HIRAHARA ,  Noriko MIYAIRI ,  Masahiko HAYAKAWA ,  Yohei MOMMA

IPC: H01M4/04

Abstract: To provide a positive electrode active material with high charge and discharge capacity, or a novel positive electrode active material. The positive electrode active material is formed in the following manner: a cobalt compound (also referred to as a precursor) containing nickel, cobalt, and manganese is obtained by a coprecipitation method; a mixture obtained by mixing a lithium compound, the cobalt compound, and an additive is heated at first heating temperature; and the heated mixture is ground or crushed and further heated at second heating temperature that is higher than the first heating temperature. The first heating temperature is higher than or equal to 400° C. and lower than or equal to 700° C. The second heating temperature is higher than 700° C. and lower than or equal to 1050° C.

公开(公告)号：US20220200041A1

公开(公告)日：2022-06-23

申请号：US17689450

申请日：2022-03-08

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Teruaki OCHIAI ,  Takahiro KAWAKAMI ,  Mayumi MIKAMI ,  Yohei MOMMA ,  Ayae TSURUTA ,  Masahiro TAKAHASHI

IPC: H01M10/0525 ,  H01M4/505 ,  H01M4/485 ,  H01M4/02 ,  H01M4/525

Abstract: Positive electrode active material particles that inhibit a decrease in capacity due to charge and discharge cycles are provided. A high-capacity secondary battery, a secondary battery with excellent charge and discharge characteristics, or a highly-safe or highly-reliable secondary battery is provided. A novel material, active material particles, and a storage device are provided. The positive electrode active material particle includes a first region and a second region in contact with the outside of the first region. The first region contains lithium, oxygen, and an element M that is one or more elements selected from cobalt, manganese, and nickel. The second region contains the element M, oxygen, magnesium, and fluorine. The atomic ratio of lithium to the element M (Li/M) measured by X-ray photoelectron spectroscopy is 0.5 or more and 0.85 or less. The atomic ratio of magnesium to the element M (Mg/M) is 0.2 or more and 0.5 or less.

公开(公告)号：US20220199983A1

公开(公告)日：2022-06-23

申请号：US17687782

申请日：2022-03-07

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Takahiro KAWAKAMI ,  Teruaki OCHIAI ,  Yohei MOMMA ,  Ayae TSURUTA ,  Masahiro Takahashi ,  Mayumi MIKAMI

IPC: H01M4/36 ,  H01M4/04 ,  H01M4/62 ,  H01G11/24 ,  H01G11/86 ,  H01G11/50 ,  H01G11/60 ,  H01M4/505 ,  H01M4/525

Abstract: Provided is a positive electrode active material which suppresses a reduction in capacity due to charge and discharge cycles when used in a lithium ion secondary battery. A covering layer is formed by segregation on a superficial portion of the positive electrode active material. The positive electrode active material includes a first region and a second region. The first region exists in an inner portion of the positive electrode active material. The second region exists in a superficial portion of the positive electrode active material and part of the inner portion thereof. The first region includes lithium, a transition metal, and oxygen. The second region includes magnesium, fluorine, and oxygen.

公开(公告)号：US20220140332A1

公开(公告)日：2022-05-05

申请号：US17423138

申请日：2020-01-22

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Tatsuyoshi TAKAHASHI ,  Mayumi MIKAMI ,  Yohei MOMMA ,  Jo SAITO

IPC: H01M4/525

Abstract: An analysis method of a lithium composite oxide is provided. The method is to analyze substitution positions of a Ni atom and a Mg atom in a compound represented by a chemical formula Li(1−x−y)Co(1−a−b)Ni(x+a)Mg(y+b)O2. The analysis method includes a first calculation step of calculating stabilization energy when a Ni atom and a Mg atom each substitute for a Li atom and/or a Co atom contained in a LiCoO2 crystal. The analysis method includes a second calculation step of calculating stabilization energy of the compound represented by the chemical formula when cation occupancy of Li sites is changed. The analysis method includes a first measurement step of measuring charge-discharge efficiency in the first cycle and charge-discharge efficiency in the n-th cycle of the compound represented by the chemical formula. Note that n means an integer greater than or equal to 2.

公开(公告)号：US20220131146A1

公开(公告)日：2022-04-28

申请号：US17506864

申请日：2021-10-21

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Jo SAITO ,  Yohei MOMMA ,  Kunihiro FUKUSHIMA ,  Shunsuke HOSOUMI ,  Kazuki TANEMURA ,  Tetsuya KAKEHATA ,  Shunpei YAMAZAKI ,  Toshikazu OHNO ,  Mayumi MIKAMI ,  Tatsuyoshi TAKAHASHI ,  Kazuya SHIMADA

IPC: H01M4/58 ,  H01M10/0569 ,  H01M4/38 ,  H01M10/052

Abstract: The present invention relates to a secondary battery and an electronic device. The secondary battery includes a positive electrode active material which exhibits a broad peak at around 4.55 V in a dQ/dVvsV curve obtained when the charge depth is increased. The secondary battery includes a positive electrode active material which, even when the charge voltage is greater than or equal to 4.6 V and less than or equal to 4.8 V and the charge depth is greater than or equal to 0.8 and less than 0.9, does not have the H1-3 type structure and can maintain a crystal structure where a shift in CoO2 layers is inhibited. The broad peak at around 4.55 V in the dQ/dVvsV curve indicates that a change in the energy necessary for extraction of lithium at around the voltage is small and a change in the crystal structure is small. Accordingly, the positive electrode active material hardly suffers a shift in CoO2 layers and a volume change and is relatively stable even when the charge depth is large.

公开(公告)号：US20220073367A1

公开(公告)日：2022-03-10

申请号：US17464205

申请日：2021-09-01

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei MOMMA ,  Mayumi MIKAMI ,  Yusuke YOSHITANI ,  Kazuki TANEMURA

IPC: C01G53/00 ,  H01M10/0525

Abstract: The present invention relates to a method for manufacturing a secondary battery and a secondary battery. A method for manufacturing a positive electrode active material with high charge and discharge capacity is provided. A method for manufacturing a positive electrode active material with high charging and discharging voltages is provided. A method for manufacturing a positive electrode active material with little deterioration is provided. The positive electrode active material is manufactured through a step of forming a composite oxide that contains lithium, nickel, manganese, cobalt, and oxygen; and a step of mixing the composite oxide and a calcium compound, and then heating the mixture at a temperature higher than or equal to 500° C. and lower than or equal to 1100° C. for 2 hours to 20 hours. By the heating, calcium is distributed at a preferred concentration in a surface portion of the positive electrode active material.

公开(公告)号：US20220029159A1

公开(公告)日：2022-01-27

申请号：US17312082

申请日：2019-12-02

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei MOMMA ,  Jyo SAITO ,  Teruaki OCHIAI ,  Kazuhei NARITA ,  Kazuhito MACHIKAWA ,  Mayumi MIKAMI

IPC: H01M4/525 ,  H01M10/0525 ,  H01M4/36 ,  C01G53/00

Abstract: An object is to provide a method for manufacturing a positive electrode active material that achieves high powder properties and high load resistance (e.g., rate performance and output resistance) when used in a lithium-ion secondary battery, within a short manufacturing cycle time and at low cost. To perform heat treatment at temperatures lower than the melting point of magnesium fluorine, lithium fluoride is mixed to melt magnesium fluorine and modify the surface of lithium cobalt oxide powder. By mixing lithium fluoride, magnesium fluorine can be melted at a temperature lower than its melting point, and a positive electrode active material is formed utilizing this eutectic phenomenon.

公开(公告)号：US20220020981A1

公开(公告)日：2022-01-20

申请号：US17292471

申请日：2019-11-07

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei MOMMA ,  Mayumi MIKAMI ,  Teruaki OCHIAI ,  Kazuhei NARITA ,  Jyo SAITO

IPC: H01M4/525 ,  H01M10/0525 ,  H01M4/38 ,  H01M4/58 ,  B60L58/12

Abstract: A positive electrode active material for a lithium ion secondary battery which has a large capacity and a good charge-and-discharge cycle performance is provided. The positive electrode active material includes lithium, cobalt, oxygen, and magnesium, and has a compound represented by a layered rock-salt crystal structure. A space group of the compound is represented by R-3m. The compound is a composite oxide in which magnesium is substituted for a lithium position and a cobalt position. The compound is a particle. The magnesium substituted for a lithium position and a cobalt position exists more in the region from the surface to 5 nm than in the region deeper than 10 nm from the surface. More magnesium is substituted for a lithium position than for a cobalt position.

公开(公告)号：US20210265621A1

公开(公告)日：2021-08-26

申请号：US17252530

申请日：2019-06-11

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Kazuhito MACHIKAWA ,  Yohei MOMMA ,  Teruaki OCHIAI ,  Mayumi MIKAMI

IPC: H01M4/36 ,  H01M4/505 ,  H01M4/525 ,  H01M4/58 ,  H01M10/0525 ,  H01M4/1391 ,  H01M4/1397

Abstract: A positive electrode active material, which has a high capacity and excellent charge and discharge cycle performance, for a lithium-ion secondary battery is provided. Alternatively, a positive electrode active material that inhibits a decrease in capacity in charge and discharge cycles when used in a lithium-ion secondary battery is provided. Alternatively, a high-capacity secondary battery is provided. Alternatively, a highly safe or reliable secondary battery is provided. The positive electrode active material contains a first substance including a first crack and a second substance positioned inside the first crack. The first substance contains one or more of cobalt, manganese, and nickel, lithium, oxygen, magnesium, and fluorine. The second substance contains phosphorus and oxygen.

公开(公告)号：US20200373568A1

公开(公告)日：2020-11-26

申请号：US16990020

申请日：2020-08-11

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei MOMMA ,  Takahiro KAWAKAMI ,  Teruaki OCHIAI ,  Masahiro TAKAHASHI

IPC: H01M4/46 ,  H01M10/0525 ,  H01M4/131 ,  H01M4/62 ,  H01M4/36 ,  H01M4/1391

Abstract: Provided is a positive electrode active material for a lithium ion secondary battery having favorable cycle characteristics and high capacity. A covering layer containing aluminum and a covering layer containing magnesium are provided on a superficial portion of the positive electrode active material. The covering layer containing magnesium exists in a region closer to a particle surface than the covering layer containing aluminum is. The covering layer containing aluminum can be formed by a sol-gel method using an aluminum alkoxide. The covering layer containing magnesium can be formed as follows: magnesium and fluorine are mixed as a starting material and then subjected to heating after the sol-gel step, so that magnesium is segregated.