Mitsubishi Chemical Corporation

Kenji Shizuka

Kenji Okahara

Kaoru Terada

Makoto Ue

Tomohiro Kusano

Hiroshi Wada

Kunihisa Shima

Jungmin Kim

Hiroyuki Imura

A lithium-transition metal compound powder for a positive-electrode material of lithium secondary batteries can include a lithium-transition metal compound that is capable of an insertion and elimination of lithium ions. The particles in the powder contain, in the inner part thereof, a compound that, when analyzed by an SEM-EDX method, has peaks derived from Group-16 elements belonging to the third or later periods of the periodic table and Group-5 to Group-7 elements belonging to the fifth and sixth periods of the periodic table.

Positive-electrode material for lithium secondary-battery, process for producing the same, positive electrode for lithium secondary battery, and lithium secondary battery

A lithium transition metal-based compound powder for a lithium secondary battery positive electrode material that can achieve both improvements of load characteristics such as rate and output characteristics and a higher density is a lithium transition metal-based compound powder containing, as a main component, a lithium transition metal-based compound that has a function of allowing elimination and insertion of lithium ions, and including a crystal structure belonging to a layer structure, wherein primary particles are aggregated to form secondary particles, the ratio A/B of a median diameter A of the secondary particles to an average diameter (average primary particle diameter B) is in the range of 8 to 100, and 0.01&#x2266;FWHM(110)&#x2266;0.5 where FWHM(110) is the half width of a (110) diffraction peak present near a diffraction angle 2&#x3b8; of 64.5&#xb0; in a powder X-ray diffraction analysis using a CuK&#x3b1; line.

Lithium transition metal-based compound powder, method for manufacturing the same, spray-dried substance serving as firing precursor thereof, and lithium secondary battery positive electrode and lithium secondary battery using the same

There is provided a powder of a lithium transition-metal compound for a positive-electrode material in a lithium secondary battery, in which the use of the powder as that of a positive-electrode material in a lithium secondary battery achieves a good balance among improvement in battery performance, cost reduction, resistance to a higher voltage, and a higher level of safety. The powder of the lithium transition-metal compound for a positive-electrode material in a lithium secondary battery is characterized in that in a mercury intrusion curve obtained by mercury intrusion porosimetry, the amount of mercury intruded is in the range of 0.8 cm/g to 3 cm/g when the pressure is increased from 3.86 kPa to 413 MPa.

Lithium transition metal-based compound powder for positive electrode material in lithium rechargeable battery, method for manufacturing the powder, spray dried product of the powder, firing precursor of the powder, and positive electrode for lithium rechargeable battery and lithium rechargeable battery using the powder

A powder of a layered lithium-nickel-manganese-cobalt composite oxide for use as a positive-electrode material for lithium secondary battery is provided which, when used as a positive-electrode material for lithium secondary battery, enables a cost reduction and higher safety to be reconciled with improved battery performances. The powder of a layered lithium-nickel-manganese-cobalt composite oxide for use as a positive-electrode material for lithium secondary battery is composed of secondary particles formed by the aggregation of primary particles. It has a composition represented by the following formula (I), has a volume resistivity of 5&#xd7;10&#x3a9;&#xb7;cm or lower in the state of being compacted at a pressure of 40 MPa, and has a value of C/S, wherein C is the concentration of carbon contained therein (% by weight) and S is the BET specific surface area thereof (m/g), of 0.025 or smaller. The powder has been regulated so as to have a volume resistivity not higher than the specified value and a considerably reduced carbon content while having a composition in a limited range, whereby a cost reduction and higher safety can be reconciled with improved battery performances.LiNiMnCoO&#x2003;&#x2003;(I)(0&#x3c;z&#x2266;0.91, 0.1&#x2266;x&#x2266;0.55, 0.20&#x2266;y&#x2266;0.90, 0.50&#x2266;x+y&#x2266;1, 1.9&#x2266;&#x3b4;&#x2266;3).

Layered lithium nickel manganese cobalt composite oxide powder for material of positive electrode of lithium secondary battery, process for producing the same, positive electrode of lithium secondary battery therefrom, and lithium secondary battery

A layered lithium-nickel-based compound oxide powder for a positive electrode material for a high density lithium secondary cell, capable of providing a lithium secondary cell having a high capacity and excellent in the rate characteristics also, is provided. A layered lithium-nickel-based compound oxide powder for a positive electrode material for a lithium secondary cell, characterized in that the bulk density is at least 2.0 g/cc, the average primary particle size B is from 0.1 to 1 &#x3bc;m, the median diameter A of the secondary particles is from 9 to 20 &#x3bc;m, and the ratio A/B of the median diameter A of the secondary particles to the average primary particle size B, is within a range of from 10 to 200. In production of a layered lithium-nickel-based compound oxide powder, which comprises spray drying a slurry having a nickel compound and a transition metal element compound capable of substituting lithium other than nickel, dispersed in a liquid medium, followed by mixing with a lithium compound, and firing the mixture, the spray drying is carried out under conditions of 0.4&#x2266;G/S&#x2266;4 and G/S&#x2266;0.0012V, when the slurry viscosity at the time of the spray drying is represented by V (cp), the slurry supply amount is represented by S (g/min) and the gas supply amount is represented by G (L/min).

Layered lithium-nickel-based compound oxide powder and its prodution process

Layered lithium-nickel-based compound oxide powder and its production process

A non-aqueous electrolyte solution that contains an organic solvent, and a lithium salt and an electrolyte, that is useful for the preparation of a secondary battery that is equipped with a negative electrode and a positive electrode, each of which is capable of storing and releasing lithium, wherein the non-aqueous electrolyte solution contains partially hydrogenated terphenyl that is a mixture of two or more compounds of which one is diphenylcyclohexane that is present in an amount ranging from 10 to 65 wt % of the partially hydrogenated terphenyl and the partially hydrogenated terphenyl has a solubility of not less than 0.5 wt % in the electrolyte solution at room temperature.

Non-aqueous electrolyte solution and non-aqueous electrolyte solution secondary battery using the same

A positive electrode material for a lithium secondary cell, which contains a spinel-type lithium manganese oxide having a crystal structure belonging to Fd3m (No. 227), wherein the lithium manganese oxide satisfies the following formula:

Lithium secondary cell and positive electrode material therefor

A nonaqueous electrolyte secondary cell, wherein a lithium-containing metal oxide capable of binding and releasing lithium is used as a positive electrode, and a nonaqueous electrolyte containing a lithium salt is used as an electrolyte, in which a spinel type lithium manganese oxide which satisfies the formula:

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Ibaraki, Japan

Kenji Shizuka