Hitachi Maxell, Limited

Maxell, Ltd.

Maxell Holdings, Ltd.

Hitachi, Ltd.

Kanto Denka Kogyo Co., Ltd.

Hitachi Maxell Energy, Ltd.

Akira Kawakami

Fusaji Kita

Kozo Kajita

Hideo Sakata

Haruki Kamizori

Kumiko Ishizuka

Kouji Murakami

Masaharu Higashiguchi

Hiroshi Kobayashi

Takaaki Sonoda

Hayato Higuchi

Koji Murakami

Hiroyasu Inoue

Hideki Tsubata

Akira Kato

Masayuki Yamada

Nobuaki Matsumoto

Shigeo Aoyama

Hideaki Katayama

Toshihiro Abe

Mitsuhiro Kishimi

Hirokazu Kamine

Kazunobu Matsumoto

Yuan Gao

Jin Nie

Tomohiro Harada

Akira Yamashita

Natalya Kirij

Leonid Markovsky

Akiko Kuwabara

Hirokazu Nomura

Ginnosuke Tanaka

Hiroki Ishikawa

Minako Iwasaki

Yurii Yagupolskii

Tatyana Savina

A lithium secondary battery pack of the present invention includes: a lithium secondary battery including an electrode body formed of a positive electrode and a negative electrode facing each other and a separator interposed therebetween, and a non-aqueous electrolyte; a PTC element; and a protection circuit including a field effect transistor. The lithium secondary battery has an energy density per volume of 450 Wh/L or more, the lithium secondary battery has a current density of 3.0 mA/cmor less, and a relational expression (1) and a relational expression (2) below are established where A (mΩ) is an impedance of the lithium secondary battery and B (mΩ) is an impedance of the entire circuit unit of the lithium secondary battery pack excepting the impedance A (mΩ) of the lithium secondary battery:A≤50 mΩ  (1)B/A≤1  (2).

Lithium secondary battery pack, as well as electronic device, charging system, and charging method using said pack

A lithium secondary battery pack of the present invention includes: a lithium secondary battery including an electrode body formed of a positive electrode and a negative electrode facing each other and a separator interposed therebetween, and a non-aqueous electrolyte; a PTC element; and a protection circuit including a field effect transistor. The lithium secondary battery has an energy density per volume of 450 Wh/L or more, the lithium secondary battery has a current density of 3.0 mA/cmor less, and a relational expression (1) and a relational expression (2) below are established where A (m&#x3a9;) is an impedance of the lithium secondary battery and B (m&#x3a9;) is an impedance of the entire circuit unit of the lithium secondary battery pack excepting the impedance A (m&#x3a9;) of the lithium secondary battery:A&#x2264;50 m&#x3a9;&#x2003;&#x2003;(1)B/A&#x2264;1&#x2003;&#x2003;(2).

An electrochemical device having excellent safety at high temperature is provided by using a separator for an electrochemical device, which is made of a porous film comprising: a porous base () having a heat-resistant temperature of 150&#xb0; C. or higher and including filler particles (); at least one kind of shutdown resin () selected from the group consisting of resin A that has a melting point in a range of 80&#xb0; C. to 130&#xb0; C. and resin B that absorbs an electrolyte and swells due to heating, and the swelling degree is increased as the temperature rises; and a binder ().

Separator for electrochemical device, and electrochemical device

A lithium secondary battery pack of the present invention includes: a lithium secondary battery including an electrode body formed of a positive electrode and a negative electrode facing each other and a separator interposed therebetween, and a non-aqueous electrolyte; a PTC element; and a protection circuit including a field effect transistor. The lithium secondary battery has an energy density per volume of 450 Wh/L or more, the lithium secondary battery has a current density of 3.0 mA/cmor less, and a relational expression (1) and a relational expression (2) below are established where A (m&#x3a9;) is an impedance of the lithium secondary battery and B (m&#x3a9;) is an impedance of the entire circuit unit of the lithium secondary battery pack excepting the impedance A (m&#x3a9;) of the lithium secondary battery:&#x2264;50 m&#x3a9;&#x2003;&#x2003;(1)&#x2264;1&#x2003;&#x2003;(2).

A nonaqueous secondary battery having a positive electrode having a positive electrode mixture layer, a negative electrode, and a nonaqueous electrolyte, in which the positive electrode contains, as an active material, a lithium-containing transition metal oxide containing a metal element selected from the group consisting of Mg, Ti, Zr, Ge, Nb, Al and Sn, the positive electrode mixture layer has a density of 3.5 g/cmor larger, and the nonaqueous electrolyte contains a compound having two or more nitrile groups in the molecule.

Nonaqueous secondary battery and method of using the same

A nonaqueous secondary battery containing a positive electrode having a positive electrode mixture layer, a negative electrode, and a nonaqueous electrolyte, wherein the positive electrode comprises, as active materials, two or more lithium-containing transition metal oxides having different average particle sizes, and the lithium-containing transition metal oxide having the smallest average particle size contains one or more of Mg, Ti, Zr, Ge, Nb, Al and Sn.

The non-aqueous secondary battery of the present invention includes a positive electrode, a negative electrode, a non-aqueous electrolyte and a separator. The positive electrode includes a positive electrode mixture layer containing a positive electrode active material, a conductive polymer, an organic silane compound, a conductive assistant and a binder, the conductive polymer is polythiophene or a derivative thereof, and the content of the conductive polymer is 0.05 to 0.5 mass % with respect to the total mass of the positive electrode mixture layer.

Non-aqueous secondary battery

In the nonaqueous secondary battery of the present invention, a positive electrode mixture layer included in a positive electrode contains a lithium-containing complex oxide defined by the general formula LiMMMO(where, Mrepresents at least one transition metal element selected from the group consisting of Co, Ni and Mn, Mrepresents at least one metal element selected from the group consisting of Mg, Ti, Zr, Ge, Nb, Al and Sn, Mrepresents an element other than Li, Mand M, 0.97&#x2266;x&#x3c;1.02, 0.8&#x2266;y&#x3c;1.02, 0.002&#x2266;z&#x2266;0.05, and 0&#x2266;v&#x2266;0.05) and has a density of 3.5 g/cmor more. A nonaqueous electrolyte contains a fluorinated nitrile compound including two or more cyano groups or a cyano group and an ester group.

Nonaqueous secondary battery and electronic device

The electrochemical device of the present invention comprises a positive electrode (), a negative electrode (), a nonaqueous electrolyte and a separator (). The separator () includes a porous layer (I) composed of a microporous film composed predominantly of a thermoplastic resin and a porous layer (II) containing a filler having a heat-resistant temperature of 150&#xb0; C. or higher as the main component. The negative electrode () contains graphite having an R value of 0.1 to 0.5 and dof 0.338 nm or less as a negative electrode active material, where the R value is a ratio of a peak intensity at 1360 cmto a peak intensity at 1580 cmin an argon ion laser Raman spectrum and the dis a lattice spacing between 002 planes. The ratio of the graphite to the negative electrode active material is 30 mass % or more, and the nonaqueous electrolyte contains vinyl ethylene carbonate or a derivative thereof, or a dinitrile compound or acid anhydride.

Electrochemical device

A nonaqueous secondary battery having a positive electrode having a positive electrode mixture layer, a negative electrode, and a nonaqueous electrolyte, in which the positive electrode contains, as an active material, a lithium-containing transition metal oxide containing a metal element selected from the group consisting of Mg, Ti, Zr, Ge, Nb, Al and Sn, the positive electrode mixture layer has a density of 3.5 g/cmor larger, and the nonaqueous electrolyte contains a compound having two or more nitrile groups in the molecule

Nonaqueous secondary battery comprising at least two lithium-containing transition metal oxides of different average particle sizes

A nonaqueous secondary battery containing a positive electrode having a positive electrode mixture layer, a negative electrode, and a nonaqueous electrolyte, in which the positive electrode comprises, as active materials, three or more lithium-containing transition metal oxides having different average particle sizes, those transition metal oxides comprise a transition metal element, the transition metal element of the transition metal oxide having the smallest average particle size is partially substituted with a metal element other than the transition metal element, and the density of the positive electrode mixture layer is t 3.8 g/cmor more.

A nonaqueous secondary battery comprising an electrode body which comprises a positive electrode and a negative electrode laminated with a separator interposed between them, and a nonaqueous electrolyte, wherein said negative electrode comprises graphite as a negative electrode active material, and has a coating density of at least 1.70 g/cm, pore diameter of the maximum of less than 0.5 &#x3bc;m, and the logarithmic value of differential intrusion of at least 0.14 cm/g at the pore diameter of the maximum.

Nonaqueous secondary battery and electronic equipment using the same

A non-aqueous secondary battery includes a positive electrode, a negative electrode, and a non-aqueous electrolyte solution where the non-aqueous electrolyte solution contains a compound A in which a halogen group is bonded to a benzene ring and a compound B oxidized at a potential lower than that of the compound A, and the compound B is at least one selected from an aromatic compound and a heterocyclic compound. Thus, a non-aqueous secondary battery having excellent overcharging safety and being capable of ensuring storage reliability with less generation of gas during storage at a high temperature can be provided.

Non-aqueous secondary battery and portable equipment using the same

A non-aqueous secondary battery is provided, which has excellent overcharging safety, less generation of gas during storage at a high temperature, and can ensure storage reliability. A non-aqueous secondary battery includes a positive electrode, a negative electrode, and a non-aqueous electrolyte solution, wherein the non-aqueous electrolyte solution contains a compound A in which a halogen group is bonded to a benzene ring and an aromatic or/and heterocyclic compound B oxidized at a potential lower than that of the compound A, a content of the compound A with respect to the total non-aqueous electrolyte solution is 1% by mass to 15% by mass, and a content of the compound B with respect to the total non-aqueous electrolyte solution is 0.005% by mass to 3% by mass.

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Ibaraki, Japan

Fusaji Kita