Mitsubishi Chemical Corporation

Kenji Okahara

Kenji Shizuka

Kaoru Terada

Denis G Fauteux

Hitoshi Suzuki

Tomohiro Kusano

Jie Shi

Noriko Shima

Eitaro Takahashi

Hiroyuki Imura

Kazuko Otani

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

There are disclosed a non-aqueous electrolyte which comprises a non-aqueous organic solvent and a lithium salt, and further contains a compound represented by the following formula (I):wherein X represents &#x2014;O&#x2014;, &#x2014;S&#x2014;, &#x2014;CO&#x2014; or &#x2014;SO, Y represents a single bond, &#x2014;CH&#x2014;, &#x2014;CH&#x2014;CH&#x2014;, &#x2014;CH&#x2550;CH&#x2014; or &#x2014;CO&#x2014; and Rto Reach independently represent a hydrogen atom, an alkyl group, a phenyl group, or a halogen group, provided that X and Y do not represent &#x2014;CO&#x2014; at the same time.

Nonaqueous electrolytic solution and secondary battery containing 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

The present invention is directed to a lithium ion electrolytic cell having a controlled electrode surface interface, and, an associated electrochemical process. The lithium ion electrolytic cell includes an electrode with a carbonaceous surface and a passivating layer, and, an electrolyte having a solvent. The passivating layer includes lithium, carbon and at least one of an additive or the product of interaction of the additive with the carbonaceous surface. The passivating layer has, as measured by X-ray photoelectron spectroscopy, a relative thickness index within the range of about from 10 to about 90, and a lithium ion content index in the range from about 0.1 to about 0.7.

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Ibaraki, Japan

Kenji Okahara