Seimi Chemical Co., Ltd.

Agc Seimi Chemical Co., Ltd.

Sumitomo Chemical Company, Limited

Yukimitsu Wakasugi

Takuya Mihara

Manabu Suhara

Koichiro Ueda

Takeshi Kawasato

Naoshi Saito

Yukiko Amagasaki

Nozomi Honda

Megumi Uchida

Tokumitsu Kato

Yukio Jitsugiri

Satoshi Takamatsu

To provide a cathode active material for a lithium ion secondary battery, which has high packing properties and high volume capacity density, and a method for its production. A cathode active material for a lithium ion secondary battery is used, which comprises a mixture B of a collection of many large particles having different particle sizes and a collection of many small particles having different particle sizes, wherein the function F(x) of a particle size x of a particle contained in the mixture B and its frequency F has a relation of the formula 1, the function E(x) of a particle size x of a particle contained in a mixture B' after the mixture B is pressed and its frequency E has a relation of the formula 2, the rate of change of the median size &#x3bc;&#x2032;relative to &#x3bc;is at most 10%, and the rate of change of the median size &#x3bc;&#x2032;relative to &#x3bc;is at least 20%, 

Cathode active material for lithium ion secondary battery, and method for its production

A lithium/nickel/cobalt/manganese-containing composite oxide powder represented by the formula LiNiCoMnMOF(wherein M is at least one element selected from the group consisting of Al, Ge, Sn, alkaline earth metal elements and transition metal elements other than Co, Mn and Ni, 0.9&#x2266;p&#x2266;1.1, 0.2&#x2266;x&#x2266;0.5, 0.2&#x2266;y&#x2266;0.5, 0.1&#x2266;z&#x2266;0.4, 0&#x2266;q&#x2266;0.5, 1.9&#x2266;a&#x2266;2.1, p+x+y+z+q=2, and 0&#x2266;a&#x2266;0.02), characterized in that when the powder is classified into small particle size-classified particles with an average particle size 2 &#x3bc;m&#x2266;D&#x2266;8 &#x3bc;m and large particle size-classified particles with an average particle size of 10 &#x3bc;m&#x2266;D&#x2266;75 &#x3bc;m, the ratio of (% by weight of the small particle size-classified particles)/(% by weight of the large particle size-classified particles) is from 15/85 to 40/60.

Lithium-containing composite oxide and its production method

A cathode active material for a non-aqueous electrolyte secondary battery comprises a lithium-containing composite oxide powder, which is represented by the formula LiNMOFwherein N is at least one element selected from the group consisting of Co, Mn and Ni, M is zirconium and optionally at least one element selected from the group consisting of Al, alkaline earth metal elements and transition metal elements other than the element N, 0.9&#x2266;p&#x2266;1.1, 0.965&#x2266;x&#x2266;1.00, 0&#x2266;y&#x2266;0.035, 1.9&#x2266;z&#x2266;2.1, x+y=1 and 0&#x2266;a&#x2266;0.02, an atomic ratio of zirconium/the element N is in a range of at least 1.0 to 4.0. A method to produce the cathode active material is provided.

Cathode active material for non-aqueous electrolyte secondary battery and its production method

Provided are a cathode active material with high safety, with high discharge capacity even at high operating voltage, and with excellent cyclic charge and discharge properties, its production method and a non-aqueous electrolyte secondary battery containing the cathode active material. The cathode active material for a non-aqueous electrolyte secondary battery comprises a surface-modified lithium-containing composite oxide particle, wherein the particle is a lithium-containing composite oxide particle represented by the general formula LiNO(wherein N&#x2550;NiML, M contains at least one element selected from Co and Mn, L is an element selected from alkaline earth metal elements, aluminum and transition metal elements other than Ni, Co and Mn, 0.9&#x2266;p&#x2266;1.1, 0.9&#x2266;x&#x3c;1.1, 0.2&#x2266;y&#x2266;0.9, and 0&#x2266;z&#x2266;0.3), and a surface layer of the particle contains aluminum, said surface layer within 5 nm having an aluminum content of at least 0.8 as an atomic ratio to a total of Ni and the element M.

Coagulated particles of nickel-cobalt-manganese hydroxide wherein primary particles are coagulated to form secondary particles are synthesized by allowing an aqueous solution of a nickel-cobalt-manganese salt, an aqueous solution of an alkali-metal hydroxide, and an ammonium-ion donor to react under specific conditions; and a lithium-nickel-cobalt-manganese-containing composite oxide represented by a general formula, LiNiMnCoOF(where 0.98&#x2266;p&#x2266;1.07, 0.3&#x2266;x&#x2266;0.5, 0.1&#x2266;y&#x2266;0.38, and 0&#x2266;q&#x2266;0.05), which is a positive electrode active material for a lithium secondary cell having a wide usable voltage range, a charge-discharge cycle durability, a high capacity and high safety, is obtained by dry-blending coagulated particles of nickel-cobalt-manganese composite oxyhydroxide formed by making an oxidant to act on the coagulated particles with a lithium salt, and firing the mixture in an oxygen-containing atmosphere.

Lithium-nickel-cobalt-manganese containing composite oxide

It is to provide a cathode active material powder for a positive electrode for a lithium secondary battery, which has a large volume capacity density, high safety and excellent durability for charge and discharge cycles. A cathode active material powder for a lithium secondary battery characterized by comprising a first composite oxide powder represented by the formula (1) LiQMOF(wherein Q is Co or Mn, M is aluminum or an alkaline earth metal element or a transition metal element other than Q, provided that when Q is Co, 0.9&#x2266;p&#x2266;1.1, 0.980&#x2266;x&#x2266;1.000, 0&#x2266;y&#x2266;0.02, 1.9&#x2266;z&#x2266;2.1, x+y=1, and 0&#x2266;a&#x2266;0.02, and when Q is Mn, 1&#x2266;p&#x2266;1.3, x=2&#x2212;y, 0&#x2266;y&#x2266;0.05, z=4, and a=0), having an average particle size D50 of from 5 to 30 &#x3bc;m, and having a compression breaking strength of at least 40 MPa; and a second composite oxide powder represented by the formula (2) LiNiCoMnNOF(wherein N is aluminum or an alkaline earth metal element or a transition metal element other than Ni, Co and Mn, 0.9&#x2266;p&#x2266;1.1, 0.2&#x2266;x&#x2266;0.8, 0&#x2266;y&#x2266;0.4, 0&#x2266;z&#x2266;0.5, 0&#x2266;q&#x2266;0.05, 1.9&#x2266;r&#x2266;2.1, x+y+z+q=1, and 0&#x2266;a&#x2266;0.02), having an average particle size D50 of from 2 to 30 &#x3bc;m, and having a compression breaking strength less than 40 MPa; in a ratio (weight ratio) of the first composite oxide powder/the second composite oxide powder being from 95/5 to 30/70.

Cathode active material powder for lithium secondary battery

Lithium-nickel-cobalt-maganese containing composite oxide, material for positive electrode active material for lithium secondary battery, and methods for producing these

To provide a lithium-nickel-cobalt-manganese composite oxide powder for a positive electrode of a lithium secondary battery, which has a large volume capacity density and high safety and is excellent in the charge and discharge cyclic durability. A positive electrode active material powder for a lithium secondary battery characterized by comprising a first granular powder having a compression breaking strength of at least 50 MPa and a second granular powder having a compression breaking strength of less than 40 MPa, formed by agglomeration of many fine particles of a lithium composite oxide represented by the formula LiNiCoMnMOF(wherein M is a transition metal element other than Ni, Co and Mn, Al or an alkaline earth metal element, 0.9&#x2266;p&#x2266;1.1, 0.2&#x2266;x&#x2266;0.8, 0&#x2266;y&#x2266;0.4, 0&#x2266;z&#x2266;0.5, y+z&#x3e;0, 0&#x2266;q&#x2266;0.05, 1.9&#x2266;2&#x2212;a&#x2266;2.1, x+y+z+q=1 and 0&#x2266;a&#x2266;0.02) to have an average particle size D50 of from 3 to 15 &#x3bc;m, in a weight ratio of the first granular powder/the second granular powder being from 50/50 to 90/10.

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Chigasaki, Japan

Yukimitsu Wakasugi