Mitsui Minings & Melting Co., Ltd.

Tetsuya Mitsumoto

Shinya Kagei

Yoshimi Hata

Hitohiko Ide

Hideaki Matsushima

Toshikazu Matsuyama

Daisuke Washida

Kyohei Yamaguchi

Yasuhiro Ochi

Daisuke Inoue

Tsukasa Takahashi

Yasunori Tabira

Natsumi Shibamura

Keisuke Miyanohara

Tomoyuki Maeda

Tomohiro Sakata

Natsumi Ito

Jun Omura

Yasuo Komoda

Yasuhiro Shibata

A positive electrode active substance for an all solid-state lithium secondary battery having an operating potential of 4.5 V or more at a metal Li reference potential, wherein the surface of the present core particles composed of a spinel-type lithium manganese-containing composite oxide containing at least Li, Mn, O, and two or more elements other than these is coated with an amorphous compound containing Li, A, where A represents one element or a combination of two or more elements selected from the group consisting of Ti, Zr, Ta, Nb, Zn, W, and Al, and O. Primary particles of the present core particles are composed of a polycrystal. The D50 is 0.5-9 μm, the value of (|mode diameter−D50|/mode diameter)×100 is 0 to 25%, the value of (|mode diameter−D10|/mode diameter)×100 is 20-58%, and the value of the average primary particle diameter/D50 is 0.20-0.99.

Positive electrode active substance for all solid-state lithium secondary battery

A Si-based negative electrode active material that is capable of improving cycle characteristics, reducing or eliminating a plateau region in the discharge profile, and further improving high-rate characteristics. The Si-based negative electrode active material contains Si and a compound containing Si and a semimetal/metal element M, wherein the content of Si in the negative electrode active material is more than 50 wt %; the content of oxygen atoms (O) is less than 30 wt %; the content of the semimetal/metal element M is more than 10 wt % and less than 50 wt %, wherein in an X-ray diffraction pattern as measured by a powder X-ray diffraction (XRD) device using Cu-K&#x3b1;1 rays, the full width at half maximum of the peak of the (111) plane of Si is 0.25&#xb0; or more; and wherein the peak intensity of the peak of the (111) plane of Si is less than 20,000 cps; and the true density is 2.5 g/cmor more.

Si-based negative electrode active material

Provided is a 5 V class spinel type lithium nickel manganese-containing composite oxide having an operating potential of 4.5 V or more with respect to a metal Li reference potential, wherein the composite oxide is able to improve cycle characteristics while suppressing the amount of gas generated under high temperature environments and, moreover, to improve output characteristics while suppressing a shoulder on discharge at around 4.1 V in a charge and discharge curve. The spinel type lithium nickel manganese-containing composite oxide is represented by a general formula [Li(LiNiMnTiMgM)O] (where 0&#x3c;a, 0&#x3c;b, 0.30&#x2264;y&#x3c;0.60, 0&#x3c;z, 0&#x2264;&#x3b1;, x=2&#x2212;a&#x2212;b&#x2212;y&#x2212;z&#x2212;&#x3b1;&#x3c;1.7, 3&#x2264;b/a&#x2264;8, 0.11&#x3c;b+z+&#x3b1;, 0&#x3c;z/b&#x3c;1, 0&#x2264;&#x3b4;&#x2264;0.2, and M represents one or two or more elements selected from the group consisting of Fe, Co, Ba, Cr, W, Mo, Y, Zr, Nb, P, and Ce).

Spinel type lithium nickel manganese-containing composite oxide

Provided is a novel positive electrode active material capable of suppressing resistance and improving rate characteristics and cycle characteristics while enhancing lithium ionic conductivity, wherein the surface of particles composed of a spinel-type composite oxide containing Li, Mn, O, and two or more other elements is coated with a lithium ion conductive oxide such as LiNbO. Proposed is a positive electrode active material for an all-solid-type lithium secondary battery, wherein the surface of present core particles composed of a spinel-type composite oxide containing Li, Mn, O, and two or more other elements is coated with an amorphous compound containing Li, A (A represents one or more elements selected from the group consisting of Ti, Zr, Ta, Nb, and Al), and O; and the molar ratio (Li/A) of Li relative to the A element in the surface, as obtained by XPS, is 1.0 to 3.5.

Cathode active material for all-solid-state lithium secondary battery

Provided is a spinel-type lithium-manganese-containing complex oxide that is related to a 5 V-class spinel, and with which output characteristics and charge-discharge cycle ability can be enhanced while suppressing gas generation. Proposed is a spinel-type lithium-manganese-containing complex oxide comprising at least Li, Mn, O, and two or more other elements, and having an operating potential of 4.5 V or more with respect to a metal Li reference potential, wherein: D50 is 0.5 to 9 &#x3bc;m; a value of (|mode diameter&#x2212;D50|/mode diameter)&#xd7;100 is 0 to 25%; a value of (|mode diameter&#x2212;D10|/mode diameter)&#xd7;100 is 20 to 58%; a ratio of average primary particle diameter/D, which is calculated from an average primary particle diameter calculated from a SEM image and the D, is 0.20 to 0.99; and a primary particle is a polycrystal.

Spinel-type lithium-manganese-containing complex oxide

Provided is a new 5 V class spinel-type lithium manganese-containing composite oxide which enables the expansion of a high potential capacity region and the suppression of gas generation. The 5 V class spinel-type lithium manganese-containing composite oxide has an operating potential of 4.5 V or more at a metal Li reference potential, and contains Li, Mn, O and two or more other elements. The spinel-type lithium manganese-containing composite oxide is characterized in that, in an electronic diffraction image from a transmission electron microscope (TEM), a diffraction spot observed in the Fd-3m structure as well as a diffraction spot not observed in the Fd-3m structure are confirmed.

5V-class spinel-type lithium-manganese-containing composite oxide

A positive electrode active material comprising a lithium metal composite oxide having a layered crystal structure provides a novel lithium metal composite oxide powder which can suppress the reaction with an electrolytic solution and raise the charge-discharge cycle ability of a battery, and can improve the output characteristics of a battery. A lithium metal composite oxide powder comprises a particle having a surface portion where one or a combination of two or more ('surface element A') of the group consisting of Al, Ti and Zr is present, on the surface of a particle comprising a lithium metal composite oxide having a layered crystal structure, wherein the amount of surface LiOH is smaller than 0.10% by weight, and the amount of surface LiCOis smaller than 0.25% by weight; in an X-ray diffraction pattern, the ratio of an integral intensity of the (003) plane of the lithium metal composite oxide to that of the (104) plane thereof is higher than 1.15; and the amount of S obtained by a measurement using ICP is smaller than 0.10% by weight of the lithium metal composite oxide powder (100% by weight).

Lithium metal composite oxide powder

Provided is a new 5 V-class spinel-type lithium-manganese-containing composite oxide capable of achieving both the expansion of a high potential capacity region and the suppression of gas generation. Proposed is the spinel-type lithium-manganese-containing composite oxide comprising Li, Mn, O and two or more other elements, and having an operating potential of 4.5 V or more at a metal Li reference potential, wherein a peak is present in a range of 14.0 to 16.5&#xb0; at 2&#x3b8;, in an X-ray diffraction pattern measured by a powder X-ray diffractometer (XRD) using CuK&#x3b1;1 ray.

Provided is a lithium metal composite oxide having a layered structure, which is particularly excellent as a positive electrode active material for batteries that are mounted on electric vehicles or hybrid vehicles. Proposed is a lithium metal composite oxide having a layered structure, which is represented by general formula Li(MnCoNi)O(0.00&#x2264;X&#x2264;0.07, 0.10&#x2264;&#x3b1;&#x2264;0.40, 0.10&#x2264;&#x3b2;&#x2264;0.40, and 0.30&#x2264;&#x3b3;&#x2264;0.75) and has a specific surface area of more than 2.0 m/g but 5.0 m/g or less and has an average particle size of the primary particles/crystallite size ratio of 5.7 to 18.5.

Lithium metal composite oxide having layered structure

Relating to a 5 V-class spinel type lithium nickel manganese-containing composite oxide having an operating potential of 4.5 V or more with respect to a Li metal reference potential, the present invention proposes a composite oxide being capable of improving cycle properties while suppressing the amount of gas generation under high temperature environments and of increasing thermodynamical stability of a positive electrode in a fully charged state. Proposed is a spinel type lithium nickel manganese-containing composite oxide represented by a general formula [Li(LiNiMnTiAlM)O] (where 0&#x3c;a, 0&#x3c;b, 0.30&#x2264;y&#x3c;0.60, 0&#x3c;z, 0&#x2264;&#x3b1;, 2-a-b-y-z-&#x3b1;&#x3c;1.7, 3&#x2264;b/a&#x2264;8, 0.1&#x3c;b+z+&#x3b1;, 0&#x3c;z/b&#x2264;1, and M represents one or two or more metal elements selected from the group consisting of Mg, Fe, Co, Ba, Cr, W, Mo, Y, Zr, Nb, and Ce).

The present invention relates to a positive electrode active material including a lithium metal composite oxide having a layer crystal structure, and provides a novel positive electrode active material for a lithium secondary cell, which can suppress the reaction with an electrolyte solution and can raise the charge-discharge cycle ability of the cell, and can make good the output characteristics of the cell. There is proposed a positive electrode active material for a lithium secondary cell, including an active particle having a surface portion where one or a combination of two or more (these are referred to as 'surface element A') of the group consisting of Al, Ti and Zr is present, on a surface of a particle including a lithium metal composite oxide having a layer crystal structure and represented by the general formula: Li1+xM1&#x2212;xO2 (wherein M is one or a combination of two or more (these are referred to as 'constituent element M') of the group consisting of Mn, Co, Ni, transition elements of from the third group elements to the 11th group elements of the periodic table, and typical elements up to the third period of the periodic table), wherein the ratio (CA/CM) of a concentration CA of the surface element A to a concentration CM of the constituent element M is higher than 0 and lower than 0.8, as measured by XPS; the amount of surface lithium impurity is smaller than 0.40% by weight; and in an X-ray diffraction pattern measured by XRD, the ratio (003)/(104) of an integral intensity of the peak originated from the (003) plane to an integral intensity of the peak originated from the (104) plane is higher than 1.15.

Positive electrode active material for lithium secondary cell

Provided is a new spinel type lithium manganese transition metal oxide for use in lithium batteries, which can increase the capacity retention ratio during cycling, and can increase the power output retention ratio during cycling. Disclosed is a spinel type lithium manganese transition metal oxide having an angle of repose of 50&#xb0; to 75&#xb0;, and having an amount of moisture (25&#xb0; C. to 300&#xb0; C.) measured by the Karl Fischer method of more than 0 ppm and less than 400 ppm.

Spinel-type lithium manganese transition metal oxide

There is provided a Co-based 5-V spinel-type lithium manganese-containing complex oxide not only having an operating potential of 4.5 V or higher but also being capable of extending its capacity region of a 5.5 to 5.5 V region and being capable of enhancing its energy density as well. There is proposed a spinel-type lithium cobalt manganese-containing complex oxide having a crystal structure classified as a space group Fd-3m and being represented by the general formula [Li(CoMn)O(wherein 0.90&#x2266;x&#x2266;1.15 and 0.75&#x2266;y&#x2266;1.25), wherein the oxide has a crystallite size measured by a Rietveld method using the fundamental method of 100 nm to 200 nm, an interatomic distance of Li&#x2014;O of 1.80 &#x212b; to 2.00 &#x212b;, and a strain of 0.20 to 0.50.

Spinel-type lithium cobalt manganese-containing complex oxide

Provided is a lithium metal compound oxide having a layered structure, which is very excellent as a positive electrode active material of a battery that is mounted on, particularly, an electric vehicle or a hybrid vehicle. Suggested is a lithium metal compound oxide having a layered structure which is expressed by general formula of LiMO(M represents metal elements including three elements of Mn, Co, and Ni). In the lithium metal compound oxide having a layered structure, D50 is more than 4 &#x3bc;m and less than 20 &#x3bc;m, a ratio of a primary particle area to a secondary particle area of secondary particles having a size corresponding to the D50 ('primary particle area/secondary particle area') is 0.004 to 0.035, and the minimum value of powder crushing strength that is obtained by crushing a powder using a microcompression tester is more than 70 MPa.

Lithium transition metal oxide having layered structure

Provided is a lithium metal composite oxide (powder) having a layered structure, which is capable of exhibiting excellent characteristics in both charge-discharge cycle ability and initial charging and discharging efficiency, and is capable of effectively reducing initial resistance, when being used in a positive electrode of a lithium battery. The lithium metal composite oxide (powder) comprises an amount of S which is less than 0.10% by mass of the lithium metal composite oxide powder, a ratio of a crystallite size of a (003) plane to a crystallite size of a (110) plane which is equal to or greater than 1.0 and less than 2.5, and a ratio of a primary particle area to a secondary particle area of 0.004 to 0.035.

Growing community of inventors

Takehara, Japan

Tetsuya Mitsumoto