Other

Nec Corporation

Nippon Mori Energy Corporation

Envision Aesc Energy Devices Ltd.

Nec Tokin Tochigi, Ltd.

Tomokazu Kumeuchi

Masato Shirakata

Hiroshi Yageta

Masaharu Satoh

Yutaka Bannai

Daisuke Kawasaki

Tatsuji Numata

Takao Daidoji

Norihide Ohyama

Junji Tabuchi

Ryuichi Shimizu

Muneaki Nakanishi

A life of a secondary battery is extended, increase in a resistance when storing a secondary battery at an elevated temperature is prevented, and increase in a resistance during a charge-discharge cycle is prevented. A positive electrode active material comprising a lithium manganate and a lithium nickelate are used. The lithium manganate is a compound represented by the following formula (1) or the compound in which some of Mn or O sites are replaced with another element:LiMnO&#x2003;&#x2003;(1)

Positive electrode active material for secondary battery, positive electrode for secondary battery, secondary battery and method for producing positive electrode active material for secondary battery

In a film packed battery, a battery power source comprising, at least, a cathode, an anode, an electrolyte, and a separator is packed with a film. In a method for producing film packed battery, a pre-charging step for charging the film packed battery while pressure is applied, for example, by sandwiching it between two flat plates is included at least once.

Method for producing a pressurized package for a film packed battery

In a secondary battery wherein a positive electrode active material layer and a negative electrode active material layer are allowed to face each other via a liquid electrolyte solution , there is used, as the electrolyte solution , a basic solvent containing a halogenated polyolefin and an aliphatic polyolefin dissolved therein.

Liquid electrolyte solution including a halogenated and aliphatic polyolefin dissolved therein and secondary battery

There is provided a method of fabricating an electrode used for a prismatic cell, including the steps of (a) winding an electrode sheet around a core, the electrode sheet comprising a positive electrode in the form of a sheet, a negative electrode in the form of a sheet, and an insulating sheet sandwiched between the positive and negative electrodes, (b) pulling out the core to thereby form a wound electrode sheet deposition, (c) heating the wound electrode sheet deposition at a temperature equal to or lower than a melting temperature of the insulating sheet for 30 minutes or smaller, and (d) compressing the wound electrode sheet deposition with a uniaxial pressure to thereby flatten the wound electrode sheet deposition. In accordance with the above-mentioned method, it is possible to increase a cell capacity per a unit volume in a prismatic cell, because the electrode sheet can be wound further half turn or a plurality of times. In addition, it is also possible to increase an efficiency in a charging and discharging cycle, because a gap between the electrodes and the insulating sheet is made smaller, and a space in a center of the wound electrode sheet deposition is also made smaller, ensuring uniform reaction in the electrode.

Method of fabricating an electrode used for a prismatic cell

Growing community of inventors

Tokyo, Japan

Tomokazu Kumeuchi