Gs Yuasa International Ltd.

Gs Yuasa Corporation

Suguru Kozono

Toshiyuki Nukuda

Yoshihiro Katayama

Shigeki Yamate

Naohiro Tsumura

Ichiro Tanaka

Kazuki Furukawa

Taro Yamafuku

Hiroe Nakagawa

Tokuo Inamasu

Akihiro Fujii

Takaaki Iguchi

Ryuji Shiozaki

Atsushi Funabiki

Kazushi Nitta

Tsubasa Matsuyoshi

Yasuyuki Abe

Kazusa Yukimoto

Kazusa Ohkubo

Koji Sukino

An SOC estimation deviceof an energy storage device includes a storage unitand a data processing unit. The energy storage devicehas a characteristic including a first deterioration mode in which a capacity drop with respect to time indicates a first transition, and a second deterioration mode in which a capacity drop indicates a second transition. The storage unitholds first correlation data Mindicating a correlation between SOC and OCV of the energy storage device in the first deterioration mode, and second correlation data Mindicating a correlation between SOC and OCV of the energy storage device in the second deterioration mode. The data processing unitexecutes a mode determination process of determining a deterioration mode of the energy storage device, and an estimation process of selecting correlation data corresponding to the deterioration mode from the storage unit, to estimate SOC of the energy storage device.

SOC estimation device of energy storage device, energy storage apparatus, and SOC estimation method of energy storage device

Provided is a nonaqueous electrolyte secondary cell including: a case; an element housed in the case, including at least a positive electrode member, a negative electrode member and a separator; and an electrolyte solution poured into the case, wherein when in the state of the case being installed, in the direction perpendicular to the liquid surface of the electrolyte solution, the length between the highest position and the lowest position of the element is represented by Land the length between the liquid surface and the lowest position of the element is represented by L, the ratio calculated with the formula LL&#xd7;100 is 10% or more and 100% or less.

Nonaqueous electrolyte secondary cell

An additive typified by tris(trimethylsilyl)phosphate, tris(trimethylsilyl)borate, and tetrakis(trimethylsiloxy)titanium (Chem. 3) are applied to a nonaqueous electrolyte containing a chain carbonate and/or a chain carboxylate as a main solvent (contained at a ratio of 70 volume % or higher). It is preferable that 0&#x2266;a&#x3c;30 is satisfied, in which 'a' denotes the volume of a cyclic carbonate among carbonates having no carbon-carbon double bond in the entire volume, defined as 100, of the carbonates having no carbon-carbon double bond and chain carboxylates in a nonaqueous solvent contained in the nonaqueous electrolyte (0&#x3c;a&#x3c;30 in the case no chain carboxylate is contained).

Nonaqueous electrolyte battery

Gas generation of a non-aqueous electrolyte battery having a negative active material that intercalates/deintercalates lithium ions at a potential not lower than 1.2 V relative to the potential of lithium as negative electrode is suppressed. A non-aqueous electrolyte battery comprising a non-aqueous electrolyte containing an electrolyte salt and a non-aqueous solvent, a positive electrode and a negative electrode is characterized in that the main active material of said negative electrode is an active material that intercalates/deintercalates lithium ions at a potential not lower than 1.2 V relative to the potential of lithium and the auxiliary active material of said negative electrode is an active material that at least intercalates lithium ions at a potential lower than 1.2 V relative to the potential of lithium and that there exists lithium showing a spin-lattice relaxation time (T) of not less than 1 second as determined by a solid-state Li&#x2014;NMR measurement in the main active material of said negative electrode. A method of manufacturing a non-aqueous electrolyte battery containing a non-aqueous electrolyte, a positive electrode and a negative electrode (a main active material and an auxiliary active material of the negative electrode) is characterized in that the negative electrode potential is lowered to not higher than 0.8 V relative to the potential of lithium at least once in the initial cycle.

Non-aqueous electrolyte battery and method of manufacturing the same

A non-aqueous electrolyte battery includes a non-aqueous electrolyte containing an electrolytic salt and a non-aqueous solvent, a positive electrode, and a negative electrode having a negative active material that intercalates/deintercalates lithium ions at a potential not lower than 1.2 V relative to the potential of lithium, wherein a film coat having a carbonate structure and a thickness of not less than 10 nm exists on the surface of the negative electrode. A non-aqueous electrolyte battery is operated in a region of potential of the negative electrode higher than 0.8 V relative to the potential of lithium.

Non-aqueous electrolyte battery, method of manufacturing the same and method of using the same

A nonaqueous electrolytic cell manufacturing method is characterized in that a nonaqueous electrolyte containing vinylene carbonate is used, a coating on the surface of the negative electrode is formed at the initial charging/discharging in such a way by lowering the negative electrode potential to less than 0.4 V with relative to the lithium potential, wherein the nonaqueous electrolytic cell comprises a nonaqueous electrolyte containing an electrolytic salt and a nonaqueous solvent, a positive electrode, and a negative electrode containing a negative electrode material into/from which lithium ions are inserted/desorbed at a potential higher than the lithium potential by 1.2 V. The nonaqueous electrolytic cell is used in a range of negative electrode potential nobler than the lithium potential by 0.8 V.

Nonaqueous electrolytic cell and its manufacturing method

A positive active material is provided which can give a battery having a high energy density and excellent high-rate discharge performance and inhibited from decreasing in battery performance even in the case of high-temperature charge. Also provided is a non-aqueous electrolyte battery employing the positive active material. The positive active material contains a composite oxide which is constituted of at least lithium (Li), manganese (Mn), nickel (Ni), cobalt (Co), and oxygen (O) and is represented by the following chemical composition formula: LiMnNiCoO(wherein 0&#x3c;a&#x2266;1.3, |b&#x2212;c|&#x2266;0.05, 0.6&#x2266;d&#x3c;1, 1.7&#x2266;e&#x2266;2.3, and b+c+d=1). The non-aqueous electrolyte battery has a positive electrode containing the positive active material, a negative electrode, and a non-aqueous electrolyte.

Active substance of positive electrode and non-aqueous electrolyte battery containing the same

Growing community of inventors

Kyoto, Japan

Suguru Kozono