Mitsubishi Chemical Corporation

Iwao Soga

Tomohiro Kawai

Hideaki Tanaka

Akira Matsumoto

Takayuki Aoshima

Yoko Watanabe

Nobuyuki Ishiwatari

Tooru Fuse

Shunsuke Yamada

Takashi Kameda

Koichi Nishio

Satoshi Akasaka

Mitsuharu Kobayashi

Shingo Morokuma

Daigo Nagayama

Hiromitsu Ikeda

Naoto Maru

Tatsuhiko Honda

Toshiya Naruto

A partition member has two surfaces in a thickness direction, and separates single cells that make up an assembled battery. When the average temperature of one of the two surfaces exceeds 180° C., a thermal resistance per unit area (θ) in the thickness direction satisfies Expression 1 below, and when the average temperatures of both of the two surfaces do not exceed 80° C., a thermal resistance per unit area (θ) in the thickness direction satisfies Expression 2 below.θ≥5.0×10(m·K/W)  (Expression 1), andθ≤4.0×10(m·K/W)  (Expression 2).

Partition member, assembled battery and method for controlling heat transfer in an assembled battery

A carbon material may include granulated particles satisfying (1L) and (2L):

Carbon material, method for producing carbon material, and non-aqueous secondary battery using carbon material

A carbon material for a non-aqueous secondary battery containing a graphite capable of occluding and releasing lithium ions, and having a cumulative pore volume at pore diameters in a range of 0.01 μm to 1 μm of 0.08 mL/g or more, a roundness, as determined by flow-type particle image analysis, of 0.88 or greater, and a pore diameter to particle diameter ratio (PD/d50 (%)) of 1.8 or less, the ratio being given by equation (1A): PD/d50 (%)=mode pore diameter (PD) in a pore diameter range of 0.01 μm to 1 μm in a pore distribution determined by mercury intrusion/volume-based average particle diameter (d50)×100 is provided.

A partition member has two surfaces in a thickness direction, and separates single cells that make up an assembled battery. When the average temperature of one of the two surfaces exceeds 180&#xb0; C., a thermal resistance per unit area (&#x3b8;) in the thickness direction satisfies Expression 1 below, and when the average temperatures of both of the two surfaces do not exceed 80&#xb0; C., a thermal resistance per unit area (&#x3b8;) in the thickness direction satisfies Expression 2 below.

A partition member has a thickness direction and a surface direction perpendicular to the thickness direction, and which separates single cells that make up an assembled battery in the thickness direction, or a single cell that makes up the assembled battery in the thickness direction and a member other than the single cells. The partition member includes, in the interior thereof, a fluid having a boiling point at normal pressure of 80&#xb0; C. to 250&#xb0; C., and a flow channel of the fluid extending along the surface direction. The fluid is held in a fluid holding part, and the fluid holding part is hermetically sealed by a packaging material.

Partition member and assembled battery

A partition member includes an encapsulated body capable of retaining a liquid, and an outer package body for accommodating the encapsulated body and the liquid. The area Sof the encapsulated body when the outer package body and the encapsulated body are seen in a planar view from the thickness direction and the area Sof a gap between the outer package body and the encapsulated body satisfy the relationship represented by formula 1 below, and the volume Vof the liquid and the volume Vof the encapsulated body satisfy the relationship represented by formula 2 below.1/(1+2)&#x2264;0.99 and&#x2003;&#x2003;Formula 10.02&#x2264;1/2&#x2264;1.90&#x2003;&#x2003;Formula 2

An object of the invention is to provide such an additive for a lithium secondary battery that improves the battery capacity and the initial efficiency of the lithium secondary battery. In the invention, a fullerene derivative having a group having a formula weight of 6 or more is used as an additive for a lithium secondary battery. A fullerene derivative having a group having a formula weight of 6 or more is contained in an anode material for a lithium secondary battery, an anode for a lithium secondary battery, and a lithium secondary battery using an anode containing the anode material. The group having a formula weight of 6 or more in the fullerene derivative is preferably one selected from the group consisting of an alkali metal atom, a chalcogen atom, a halogen atom, an aliphatic hydrocarbon group, an aromatic hydrocarbon group, a heterocyclic group, a characteristic group containing oxygen, a characteristic group containing sulfur and a characteristic group containing nitrogen.

Additive for anode material for lithium secondary battery, anode material for lithium secondary battery, anode and lithium secondary battery using the anode material for lithium secondary battery

To improve an impregnation property of an electrolyte and the cycle characteristics, which have been a problem in the case of employing a casing having a variable shape. A lithium secondary cell comprising a casing having a variable shape, and a cell element having a positive electrode, a negative electrode and an electrolyte, sealed in the casing, wherein a compound represented by following formula (1) is contained in the lithium secondary cell:A-X-A&#x2003;&#x2003;(1)(wherein X is a Group VI element in the periodic table, and Aand Arepresent an aromatic group, provided that Aand Amay be the same or different, and may be connected each other to constitute a ring.)

Lithium secondary cell

To increase safety against overcharging of a lithium secondary cell which uses a lithium-nickel compound oxide as a positive electrode active material. A lithium secondary cell comprises a casing () and a lithium secondary cell element () using a lithium-nickel compound oxide as a positive electrode active material, accommodated in the casing. The specific surface area of the lithium-nickel compound oxide is from 0.1 to 10 m/g, and a surface area capacity ratio S/C, i.e. a ratio of a cell surface area S (cm) to a cell capacity (mAh), is from 0.05 to 5.

To improve an impregnation property of an electrolyte and the cycle characteristics, which have been a problem in the case of employing a casing having a variable shape. A lithium secondary cell comprising a casing having a variable shape, and a cell element having a positive electrode, a negative electrode and an electrolyte, sealed in the casing, wherein a compound represented by following formula (1) is contained in the lithium secondary cell:A1-X-A2&#x2003;&#x2003;(1)(wherein X is a Group VI element in the periodic table, and A1 and A2 represent an aromatic group, provided that A1 and A2 may be the same or different, and may be connected each other to constitute a ring.)

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Kanagawa, Japan

Iwao Soga