公开(公告)号：US20220231341A1

公开(公告)日：2022-07-21

申请号：US17616582

申请日：2020-05-26

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Kazutaka KURIKI ,  Yumiko YONEDA ,  Yohei MOMMA ,  Teruaki OCHIAI

IPC: H01M10/0568 ,  H01M50/124 ,  H01M50/119 ,  H01M50/121 ,  H01M4/525 ,  H01M10/0525 ,  H01M4/587 ,  H01M10/48

Abstract: A lithium-ion secondary battery having high capacity and excellent charge and discharge cycle performance is provided. A secondary battery having high capacity is provided. A secondary battery having excellent charge and discharge performance is provided. A secondary battery in which a decrease in capacity is suppressed even at high temperatures is provided. The secondary battery includes a positive electrode, a negative electrode, an electrolyte solution, and an exterior body. The positive electrode includes a positive electrode active material. The positive electrode active material contains lithium, cobalt, oxygen, magnesium, and fluorine. The number of magnesium atoms contained in the positive electrode active material is greater than or equal to 0.001 times and less than or equal to 0.1 times the number of cobalt atoms contained in the positive electrode active material. The positive electrode active material includes a region having a layered rock-salt crystal structure. The electrolyte solution contains an ionic liquid. The exterior body includes a metal layer and a polymer layer stacked over the metal layer. The polymer layer includes a region in contact with the electrolyte solution.

公开(公告)号：US20220199989A1

公开(公告)日：2022-06-23

申请号：US17689533

申请日：2022-03-08

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

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

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.

公开(公告)号：US20220190319A1

公开(公告)日：2022-06-16

申请号：US17438645

申请日：2020-03-19

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

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

Abstract: A positive electrode active material for a lithium-ion secondary battery and with high capacity and excellent charging and discharging cycle performance is provided. The positive electrode active material contains lithium, cobalt, nickel, aluminum, and oxygen, and the spin density attributed to one or more of a divalent nickel ion, a trivalent nickel ion, a divalent cobalt ion, and a tetravalent cobalt ion is within a predetermined range. It is preferable that the positive electrode active material further contain magnesium. An appropriate magnesium concentration is represented by a concentration with respect to cobalt. It is preferable that the positive electrode active material further contain fluorine.

公开(公告)号：US20220185694A1

公开(公告)日：2022-06-16

申请号：US17442208

申请日：2020-03-25

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei MOMMA ,  Mayumi MIKAMI ,  Teruaki OCHIAI

IPC: C01G53/00 ,  H01M4/505 ,  H01M4/525 ,  H01M4/04 ,  H01M10/0525

Abstract: A positive electrode active material with high capacity and excellent charge and discharge cycle performance, a positive electrode active material with high productivity, a positive electrode active material that suppresses a decrease in capacity, or the like is provided. Alternatively, a high-capacity secondary battery, a secondary battery with excellent charge and discharge characteristics, a highly safe or reliable secondary battery, or the like is provided. The positive electrode active material is obtained by a first heating step of heating a mixture of a first material, a second material, and a third material and a second heating step of heating a mixture which is a mixture of the mixture, a fourth material, and a fifth material and has a total amount of 15 g or more. The first material is a halogen compound including an alkali metal, the second material includes magnesium, the third material is a metal oxide including a metal A and cobalt, the fourth material includes nickel, and the fifth material includes aluminum. Each heating is performed in an atmosphere including oxygen. A temperature in the first heating step is lower than a temperature in the second heating step by 20° C. or more.

公开(公告)号：US20220115637A1

公开(公告)日：2022-04-14

申请号：US17560408

申请日：2021-12-23

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01M4/131 ,  H01M4/1315 ,  H01M4/1391 ,  H01M4/62 ,  H01M4/13915 ,  H01M4/134 ,  H01M4/36 ,  H01M4/525 ,  H01M4/86

Abstract: A positive electrode active material which can improve cycle characteristics of a secondary battery is provided. Two kinds of regions are provided in a superficial portion of a positive electrode active material such as lithium cobaltate which has a layered rock-salt crystal structure. The inner region is a non-stoichiometric compound containing a transition metal such as titanium, and the outer region is a compound of representative elements such as magnesium oxide. The two kinds of regions each have a rock-salt crystal structure. The inner layered rock-salt crystal structure and the two kinds of regions in the superficial portion are topotaxy; thus, a change of the crystal structure of the positive electrode active material generated by charging and discharging can be effectively suppressed. In addition, since the outer coating layer in contact with an electrolyte solution is the compound of representative elements which is chemically stable, the secondary battery having excellent cycle characteristics can be obtained.

公开(公告)号：US20210320290A9

公开(公告)日：2021-10-14

申请号：US17064724

申请日：2020-10-07

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01M4/134 ,  H01M4/131 ,  H01M4/525 ,  H01M4/36 ,  H01M10/0525

Abstract: A positive electrode active material which can improve cycle characteristics of a secondary battery is provided. Two kinds of regions are provided in a superficial portion of a positive electrode active material such as lithium cobaltate which has a layered rock-salt crystal structure. The inner region is a non-stoichiometric compound containing a transition metal such as titanium, and the outer region is a compound of representative elements such as magnesium oxide. The two kinds of regions each have a rock-salt crystal structure. The inner layered rock-salt crystal structure and the two kinds of regions in the superficial portion are topotaxy; thus, a change of the crystal structure of the positive electrode active material generated by charging and discharging can be effectively suppressed. In addition, since the outer coating layer in contact with an electrolyte solution is the compound of representative elements which is chemically stable, the secondary battery having excellent cycle characteristics can be obtained.

公开(公告)号：US20210313571A1

公开(公告)日：2021-10-07

申请号：US17264701

申请日：2019-07-24

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei MOMMA ,  Teruaki OCHIAI ,  Mayumi MIKAMI ,  Jyo SAITOU

IPC: H01M4/525 ,  H01M10/0525 ,  H01M4/505 ,  H01M10/0568 ,  H01M10/0569 ,  C01G51/00 ,  C01G53/00

Abstract: A positive electrode active material, which has higher capacity and excellent charge and discharge cycle performance, for a lithium-ion secondary battery is provided. The positive electrode active material includes lithium, cobalt, magnesium, oxygen, and fluorine; when a pattern obtained by powder X ray diffraction using a CuKα1 ray is subjected to Rietveld analysis, the positive electrode active material has a crystal structure having a space group R-3m, a lattice constant of an a-axis is greater than 2.814×10(−10th power) m and less than 2.817×10(−10th power) m, and a lattice constant of a c-axis is greater than 14.05×10(−10th power) m and less than 14.07×10(−10th power) m; and in analysis by X-ray photoelectron spectroscopy, a relative value of a magnesium concentration is higher than or equal to 1.6 and lower than or equal to 6.0 with the cobalt concentration regarded as 1.

公开(公告)号：US20210305553A1

公开(公告)日：2021-09-30

申请号：US17345565

申请日：2021-06-11

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：US20210184214A1

公开(公告)日：2021-06-17

申请号：US16761504

申请日：2018-11-16

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Mayumi MIKAMI ,  Yohei MOMMA ,  Kazutaka KURIKI ,  Kazuhei NARITA

IPC: H01M4/58 ,  H01M10/0562 ,  H01M10/0525 ,  H01M4/62 ,  H01M4/587

Abstract: A conduction path in an all-solid-state secondary battery is difficult to keep with a volume change in an active material due to charging and discharging in some cases.
A positive electrode active material with a small volume change between the charged state and the discharged state is used for an all-solid-state secondary battery. For example, a positive electrode active material that has a layered rock-salt crystal structure in the discharged state and a crystal structure similar to the cadmium chloride type crystal structure in the charged state with a depth of charge of approximately 0.8 changes less in its volume and crystal structure between charging and discharging than known positive electrode active materials.

公开(公告)号：US20210083281A1

公开(公告)日：2021-03-18

申请号：US16611791

申请日：2018-05-11

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Mayumi MIKAMI ,  Aya UCHIDA ,  Yumiko YONEDA ,  Yohei MOMMA ,  Masahiro TAKAHASHI ,  Teruaki OCHIAI

IPC: H01M4/525 ,  H01M4/131 ,  H01M4/134 ,  H01M4/133 ,  H01M4/505 ,  H01M4/36 ,  H01M4/139 ,  H01M10/0525 ,  C01G53/00

Abstract: A positive electrode active material having high capacity and excellent cycle performance is provided. The positive electrode active material has a small difference in a crystal structure between the charged state and the discharged state. For example, the crystal structure and volume of the positive electrode active material, which has a layered rock-salt crystal structure in the discharged state and a pseudo-spinel crystal structure in the charged state at a high voltage of approximately 4.6 V, are less likely to be changed by charge and discharge as compared with those of a known positive electrode active material.