Panasonic Corporation

Matsushita Electric Industrial Co., Ltd.

Sumitomo Metal Mining Company, Ltd.

Other

Mitsui Minings & Melting Co., Ltd.

Shinji Arimoto

Masatoshi Nagayama

Satoshi Matsumoto

Yutaka Kawatate

Hiroshi Yoshizawa

Takuya Nakashima

Koichi Numata

Hideo Sasaoka

Tsuneyoshi Kamada

Tomoko Iwanaga

Yoshiaki Nitta

Hidekazu Hiratsuka

Norihiro Yamamoto

Takahiro Sakamoto

Isao Abe

Takahiro Okuyama

A method for manufacturing a positive electrode active material includes: (a) preparing a fired powder of a lithium nickel composite oxide by mixing a nickel compound selected from a nickel hydroxide including nickel, and an element selected from other transition metal elements, elements of the second group and elements of the thirteenth group of the Periodic System, a nickel oxyhydroxide thereof, and a nickel oxide obtained by roasting thereof, and a lithium compound, and firing the mixture at a maximum temperature of 650&#xb0; C. to 850&#xb0; C. under oxygen atmosphere; and (b) preparing a lithium nickel composite oxide powder by mixing the fired powder with water to obtain a slurry, washing the fired powder with water at a temperature of 10&#xb0; C. to 40&#xb0; C., while controlling an electrical conductivity of a liquid portion of the slurry to 30 mS/cm to 60 mS/cm, then filtering and drying the resultant fired powder.

Positive electrode active material manufacturing method with control of washing slurry liquid electrical conductivity

A positive electrode active material for a nonaqueous electrolyte secondary battery that is constituted by a lithium nickel composite oxide that combines a high capacity with excellent thermal stability, a manufacturing method suitable for industrial production, and a nonaqueous electrolyte secondary battery of high safety. A positive electrode active material for a nonaqueous electrolyte secondary battery includes a lithium nickel composite oxide represented by the following composition formula (1):LiNiM1O&#x2003;&#x2003;(1)(where M1 represents at least one element selected from transition metal elements other than Ni, elements of the second group of the Periodic System and elements of the thirteenth group of the Periodic System; a satisfies the condition 0.01&#x2264;a&#x2264;0.5; and b satisfies the condition 0.85&#x2264;b&#x2264;1.05). The content of carbon in the lithium nickel composite oxide is equal to or less than 0.08% by mass.

Positive electrode active material for nonaqueous electrolyte secondary battery, manufacturing method of same, and nonaqueous electrolyte secondary battery using same

A lithium nickel composite oxide, having small inner resistance, large battery capacity and high thermal stability, can be used as a positive electrode active material for a non-aqueous electrolyte secondary battery. The positive electrode active material is composed of the lithium nickel composite oxide of LiNiMO(wherein M represents at least one element selected from a transition metal element other than Ni, the second group element and the thirteenth group element; a satisfies 0.01&#x2266;a&#x2266;0.5; and b satisfies 0.9&#x2266;b&#x2266;1.1). This is obtained by filtering and drying the fired powder after water washing, wherein it is dried at 90&#xb0; C. or lower, till moisture is reduced to 1% or less by mass in drying, and then at 120&#xb0; C., and under gas atmosphere where content of compound components containing carbon is 0.01% or less by volume, or under vacuum atmosphere.

Positive electrode active material, method for producing same, and non-aqueous electrolyte secondary battery using same

A method for producing a lithium-containing transition metal oxide represented by the general formula: Li[Li(NiM)]Owhere M is metal other than Li and Ni, 0&#x2266;x, and 0&#x3c;a. The method includes: (i) mixing a transition metal compound containing Ni and M in a molar ratio of a:(1&#x2212;a) with lithium carbonate in a predetermined ratio; (ii) causing the temperature of the mixture to reach a predetermined temperature range while repeatedly raising and lowering the temperature thereof; and (iii) thereafter reacting the transition metal compound with the lithium carbonate in the predetermined temperature range.

Method for producing lithium-containing transition metal oxide

A positive electrode active material for a non-aqueous electrolyte secondary battery includes a particle of a composite oxide which contains Li and Co, wherein: the composite oxide further contains an element Mand an element M; the element Mis at least one selected from the group consisting of Mg, Cu and Zn; the element Mis at least one selected from the group consisting of Al, Ca, Ba, Sr, Y and Zr; the element Mis uniformly distributed in the particle; and the element Mis distributed in the surface portion of the particle more than in the inside thereof.

Active material of positive electrode for nonaqueous electrolyte secondary battery and process for producing the same

A non-aqueous electrolyte secondary battery provided with a positive electrode having a lithium-manganese composite oxide as a positive electrode material, a negative electrode comprising a material capable of absorbing and releasing lithium and a non-aqueous electrolyte can be inhibited from deterioration of the negative electrode and can maintain excellent battery performances even after stored in a high-temperature environment or subjected to charging and discharging cycles at high temperatures by containing at least one of sodium (Na), potassium (K), calcium (Ca) and strontium (Sr).

Non-aqueous electrolyte secondary battery

There is provided a positive electrode active material for a non-aqueous electrolyte secondary battery, comprising a composite oxide represented by the general formula (1): (LiM)(CoM)Owhere lithium and cobalt are partly replaced with element M in the crystal structure of LiCoO, wherein element M is at least one selected from the group consisting of Al, Cu, Zn, Mg, Ca, Ba and Sr, and 0.02&#x2266;x+y&#x2266;0.15, 0.90&#x2266;a/b&#x2266;1.10, and 1.8&#x2266;c&#x2266;2.2 are satisfied.

Positive electrode active material for non-aqueous electrolyte secondary cell and cell using the same

The process for preparing spinel-type lithium manganate according to the present invention is constituted by a process to admix the electrolyzed manganese dioxide, which is obtained by neutralizing manganese dioxide precipitated by means of electrolysis with any of potassium hydroxide, potassium carbonate and lithium hydroxide, and a lithium material and a process to subject the resulting mixture to a sintering process.

Method for preparing lithium manganate having spinel structure

Electrolytic manganese dioxide is pulverized. The manganese dioxide power is neutralized with sodium hydroxide or sodium carbonate to a pH of 2 or higher. The neutralized electrolytic manganese dioxide powder is mixed with a lithium raw material and the mixture is fired.

Growing community of inventors

Osaka, Japan

Shinji Arimoto