Gs Yuasa International Ltd.

Gs Yuasa Corporation

Honda Motor Co., Ltd.

Toshiyuki Nukuda

Yoshihiro Katayama

Tokuo Inamasu

Daisuke Endo

Akihiro Fujii

Toru Tabuchi

Suguru Kozono

Shigeki Yamate

Yoshinobu Yasunaga

Hiroe Nakagawa

Ryuji Shiozaki

Yukiko Fujino

Miki Yasutomi

Mariko Kohmoto

Manabu Kanemoto

Mitsuhiro Kodama

Naohiro Tsumura

Ichiro Tanaka

Masakazu Tsutsumi

Masamitsu Tononishi

Tadashi Kakeya

Jun Nakamura

Shinsuke Yoshitake

Taro Yamafuku

Kazuya Okabe

Tomonori Kishimoto

Nobuyuki Naganawa

Takaaki Iguchi

Yuta Kashiwa

Hideto Watanabe

Hajime Kawamoto

Atsushi Funabiki

Toshiaki Kojima

Yasunori Okuno

Yohei Shibata

Hiroshi Yufu

Kazusa Yukimoto

Kazusa Ohkubo

Koji Sukino

Takashi Egawa

Takashi Watari

Tokuo Inamatsu

A lithium secondary battery is produced by employing a charging method where a positive electrode upon charging has a maximum achieved potential of 4.3 V (vs. Li/Li) or lower. The lithium secondary battery contains an active material including a solid solution of a lithium transition metal composite oxide having an &#x3b1;-NaFeO-type crystal structure. The solid solution has a diffraction peak observed near 20 to 30&#xb0; in X-ray diffractometry using CuK&#x3b1; radiation for a monoclinic Li[LiMn]O-type before charge-discharge. The lithium secondary battery is charged to reach at least a region with substantially flat fluctuation of potential appearing in a positive electrode potential region exceeding 4.3 V (vs. Li/Li) and 4.8 V (vs. Li/Li) or lower. A dischargeable electric quantity in a potential region of 4.3 V (vs. Li/Li) or lower is 177 mAh/g or higher.

Method for producing active material for lithium secondary battery and method of using lithium secondary battery

A rubber valve body for sealed battery includes a rubber composition containing a resin in an amount of 20% by mass or more and an inorganic substance, wherein the melting point of the resin is in a range of 100 to 165&#xb0; C.

Rubber valve body for sealed battery, safety valve device and alkaline storage battery

An energy storage device including a spiral electrode group in which a first electrode plate and a second electrode plate having polarity reverse to that of the first electrode plate are spirally wound with a separator interposed therebetween, wherein the second electrode plate is opposed to an inner circumference and an outer circumference of the first electrode plate, portions of the separator are reinforced, the reinforced portions of the separator include a first reinforced portion formed between a winding-start end of the first electrode plate and the second electrode plate located on a radially outer side of the winding-start end, and a second reinforced portion formed between the winding-start end of the first electrode plate and the second electrode plate located on a radially inner side of the winding-start end, and the first reinforced portion and the second reinforced portion are arranged apart from each other.

Energy storage device including spiral electrode group with reinforced separator

Provided are an electric storage device in which a current collector is not easily broken even when vibration is applied, and a vehicle having this electric storage device. This electric storage device includes a case having a first inner surface and a second inner surface adjacent to the first inner surface, an electrode assembly housed in the case and including a positive electrode plate and a negative electrode plate insulated from each other, an electrode terminal disposed outside the case, and a current collector housed in the case and electrically connecting the electrode assembly and the electrode terminal to each other. A distal end edge of a distal end portion of the current collector is supported on the first inner surface of the case.

Electric storage device having current collector and vehicle having the electric storage device

An object is to provide a positive active material for nonaqueous electrolyte secondary battery, which is capable of providing a battery with excellent cycle performance. Provided are a positive active material for nonaqueous electrolyte secondary battery, which includes an Fe-containing lithium vanadium phosphate compound having a NASICON-type structure, wherein in the Fe-containing lithium vanadium phosphate compound, the percentage of iron atoms relative to the sum of vanadium and iron atoms is 2% or more and 20% or less; and the like.

Positive active material for nonaqueous electrolyte secondary batteries and nonaqueous electrolyte secondary battery

The positive active material is a positive active material for a lithium secondary battery, including a lithium transition metal compound that has an olivine crystal structure and contains at least Ni, Fe, and Mn as transition metal elements, wherein when the sum of mole atoms of Ni, Fe, and Mn of transition metal elements contained in the lithium transition metal compound is expressed as 1, and the mole atomic ratios of Ni, Fe, and Mn are represented by a, b, and c (a+b+c=1, a&#x3e;0, b&#x3e;0, c&#x3e;0), respectively, the following is satisfied: 0.85&#x2266;c&#x2266;0.92 and 0.3&#x2266;a/(a+b)&#x2266;0.9.

Positive active material for lithium secondary battery and lithium secondary battery

The present invention provides a LiV(PO)-based positive active material for a lithium secondary battery, which has high discharge capacity and excellent storage performance, particularly high-temperature storage performance; and a lithium secondary battery made using the positive active material. The positive active material for a lithium secondary battery has general formula LiV(PO)(BO)(0&#x3c;x&#x2266;2). It is preferable that x be 2&#x2266;x&#x2266;2. Also provided are a positive electrode for a lithium secondary battery containing the positive active material; and a lithium secondary battery including the positive electrode.

Positive active material for lithium secondary battery, electrode for lithium secondary battery, and lithium secondary battery

It is an object of the present invention to provide an active material for a lithium secondary battery having high discharge capacity and excellent in high rate discharge characteristics and a lithium secondary battery using the same. The active material for a lithium secondary battery containing a solid solution of a lithium-transition metal composite oxide having an &#x3b1;-NaFeOtype crystal structure and the lithium secondary battery using the same have features that the composition ratios of the metal elements contained in the solid solution satisfy LiCoNiMgMn(x&#x3e;0; y&#x3e;0; z&#x3e;0; x+y+z&#x3c;1); the active material has an X-ray diffraction pattern capable of belonging to space group P; and the active material has discharge capacity exceeding 200 mAh/g. Further, in addition to the above-mentioned features, they have features that an intensity ratio between the diffraction peak of (003) plane and the diffraction peak of (114) plane measured by X-ray diffractometry is I/I&#x2267;1.15 and/or the half width of the diffraction peak of (003) plane is 0.15&#xb0; or less and the half width of the diffraction peak of (114) plane is 0.25&#xb0; or less.

Active material for lithium secondary battery, electrode for lithium secondary battery, lithium secondary battery, and method for producing the same

It is an object of the present invention to provide a positive electrode material having a large ratio of the discharge capacity around 4 V to the total discharge capacity including the discharge capacity at 4V or lower while making the discharge capacity around 4 V sufficient, for the purpose of providing a lithium secondary battery using a lithium transition metal phosphate compound excellent in thermal stability, utilizing the discharge potential around 4V (vs. Li/Li) that is higher than the discharge potential of LiFePO, and being advantageous with respect to the detection of the end of discharge state, and a lithium secondary battery using the same. The present invention uses a positive active material for a lithium secondary battery containing a lithium transition metal phosphate compound represented by LiMnFeCoPO(0.1&#x2266;x&#x2266;0.2, 0&#x3c;y&#x2266;0.2).

Positive active material for lithium secondary battery, and lithium secondary battery

Disclosed is a mixed material of lithium iron phosphate and carbon, which contains secondary particles as aggregates of lithium iron phosphate primary particles and a fibrous carbon which is present inside the secondary particles. An electrode containing such a mixed material, a battery comprising such an electrode, a method for producing such a mixed material, and a method for producing a battery are also disclosed.

Mixed material of lithium iron phosphate and carbon, electrode containing same, battery comprising such electrode, method for producing such mixed material, and method for producing battery

The active material for a lithium secondary battery includes a solid solution of a lithium transition metal composite oxide having an &#x3b1;-NaFeOtype crystal structure, in which the composition ratio of Li, Co, Ni, and Mn contained in the solid solution satisfies LiCoNiMn(x+y&#x2266;1, 0&#x2266;y and 1&#x2212;x&#x2212;y=z); in an Li[LiMn]O(x)-LiNiMnO(y)-LiCoO(z) type ternary phase diagram, (x, y, z) is represented by values in a range present on or within a line of a heptagon (ABCDEFG) defined by the vertexes; point A(0.45, 0.55, 0), point B(0.63, 0.37, 0), point C(0.7, 0.25, 0.05), point D(0.67, 0.18, 0.15), point E(0.75, 0, 0.25), point F(0.55, 0, 0.45), and point G(0.45, 0.2, 0.35); and the intensity ratio between the diffraction peaks on (003) plane and (104) plane measured by X-ray diffractometry before charge-discharge is I/I&#x2267;1.56 and at the end of discharge is I/I&#x3e;1.

Active material for lithium secondary battery, lithium secondary battery, and method for producing the same

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

The invention provides a polyanion-based positive active material which can improve storage stability (especially, high temperature storage stability), charge and discharge cycle performance and the like of a lithium secondary battery, and a lithium secondary battery using the same. The positive active material for a lithium ion secondary battery contains lithium iron cobalt phosphate represented by the general formula: LiFeCoPO(0&#x3c;x&#x2266;0.019, 0&#x2266;y&#x2266;1.2). By using the positive active material for a lithium secondary battery, high temperature storage stability and charge and discharge cycle performance can be improved in comparison with a case where LiFePOcontaining no Co is used. By using the positive active material, a lithium ion secondary battery can be suitable for applications in fields of electric automobiles and industrial batteries in which long lives, high capacities, and high output powers are required.

A process for producing a lithium secondary battery employs a charging method where a positive electrode upon charging has a maximum achieved potential of 4.3 V (vs. Li/Li+) or lower. The process includes charging the lithium secondary battery to reach at least a region with relatively flat fluctuation of potential appearing in a positive electrode potential region exceeding 4.3 V (vs. Li/Li) and 4.8V (vs. Li/Li) or lower. The lithium secondary battery includes an active material having a solid solution of a lithium transition metal composite oxide having an &#x3b1;-NaFeOtype crystal structure. The composition ratio of Li, Co, Ni, and Mn contained in the solid solution satisfies LiCoNiMn(x+y&#x2266;1, 0&#x2266;y and 1&#x2212;x&#x2212;y=z).

Process for producing lithium secondary 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.

Growing community of inventors

Kyoto, Japan

Toshiyuki Nukuda