Nec Corporation

Other

Kao Corporation

Unitika Ltd.

Shin Serizawa

Masatoshi Iji

Kazuhiko Inoue

Hiroo Takahashi

Jiro Iriyama

Yukihiro Kiuchi

Tsunenori Yanagisawa

Daisuke Kawasaki

Takehiro Noguchi

Tatsuji Numata

Ryuichi Kasahara

Tetsuya Kajita

Ichiro Sato

Emiko Fujii

Tadashi Shinomiya

Akira Yamamoto

Masaaki Yamaya

Kenji Yamamoto

Takuya Hasegawa

Makiko Takahashi

Akira Takenaka

Kazue Ueda

Hiroaki Kishimoto

Yoshiteru Kobayashi

Suguru Tamai

Hiroo Kamikawa

Yohei Kabashima

Norio Fukawa

Kazuhiko Inou

Satoshi Umeyama

Deterioration in cycle characteristics and battery swelling are improved. The lithium ion secondary battery of the present invention is characterized in comprising an electrolyte solution comprising a multifunctional monomer comprising two or more epoxy groups and a negative electrode comprising a binder comprising a polymer comprising a monomer unit comprising a functional group selected from the group consisting of &#x2014;OH, &#x2014;OM, &#x2014;COOH, &#x2014;COOM and &#x2014;COOCH, wherein M is a metal element, and n is an integer of 1 to 5.

Lithium ion secondary battery

An object of the present invention is to provide a polyimide binder which can be prepared under lower temperature conditions. The binder composition for a secondary battery of the present invention is characterized in comprising a polyamic acid and an aromatic compound comprising an electron donating group and an organic acid group.

Resin composition

The purpose of the present invention is to provide an electrode with reduced thermal deterioration even though the electrode has an insulating layer comprising a polyimide. The present invention relates to an electrode comprising a current collector and an electrode mixture layer, wherein the electrode comprises an insulating layer comprising a polyimide and an aromatic compound having an electron donating group and an organic acid group.

Electrode with heat-resistant insulating layer

A purpose of the present invention is to provide a binder composition for a secondary battery which can impart excellent battery characteristics, even when the heat treatment temperature is low. The binder composition for a secondary battery according to the present invention is characterized by comprising a polyamic acid comprising a repeating unit represented by chemical formula (1) and an aromatic compound comprising an electron donating group and an organic acid group, wherein A is a tetravalent group obtained by removing acid anhydride groups from a tetracarboxylic dianhydride, B is a divalent group obtained by removing amino groups from a diamine, and at least one of A and B is an aliphatic group.

Binder composition for secondary battery

A purpose of the present invention is to provide a binder composition for a secondary battery which improves the charge and discharge efficiency and the cycle characteristics of a battery. The binder composition for a secondary battery of the present invention is characterized by comprising a polyamide-imide comprising a repeating unit represented by chemical formula (1) or a precursor thereof, wherein A is a trivalent group obtained by removing carboxyl groups from a tricarboxylic acid, B is a divalent group obtained by removing amino groups from a diamine, and at least one of A and B is an aliphatic group.

The purpose of the present invention is to provide a lithium secondary battery which has improved service life characteristics by suppressing a decomposition reaction of the electrolyte solution in the field of batteries that operate at high voltages or are assumed to be used at high temperatures for a long period of time. The present invention relates to an electrolyte solution for a secondary, which is characterized by containing a sulfone compound, a fluorine-containing cyclic acetal compound and a cyclic carbonate in a specific composition; and a secondary battery which uses this electrolyte solution for a secondary battery.

Electrolyte solution for secondary battery and secondary battery

An object of the present invention is to provide a binder composition for a secondary battery for achieving improved charge-discharge efficiency and good cycle characteristics at the same time. The binder composition for a secondary battery according to the present invention is characterized in comprising a polyamic acid comprising a repeating unit consisting of a skeleton based on an aromatic tetracarboxylic acid dianhydride and a skeleton based on an alicyclic diamine represented by structural formula: NH&#x2014;(CH)&#x2014;R&#x2014;(CH)&#x2014;NH, wherein Rrepresents alicyclic group, and n and m each independently represent the number of repeating units selected from 1 to 5; and/or a polyamic acid comprising a repeating unit consisting of a skeleton based on an alicyclic tetracarboxylic acid dianhydride and a skeleton based on an aromatic diamine.

Binder for secondary battery

The object of an exemplary embodiment of the invention is to provide a lithium ion secondary battery having an excellent charge and discharge cycle property. An exemplary embodiment of the invention is a lithium ion secondary battery, comprising a battery assembly in which a positive electrode and a negative electrode are stacked through a separator and a package in which the battery assembly and an electrolyte are placed; wherein the negative electrode comprises a negative electrode collector which is composed of a metal and a negative electrode active material layer which is formed on the negative electrode collector and which comprises a negative electrode active material and a binder; wherein the negative electrode collector and the negative electrode active material layer have a crack which is formed so as to be communicated with each of them; and wherein the crack reaches an outer peripheral edge from an inside of the negative electrode.

The present invention relates to an electrode binder composition including a high-molecular-weight poly(amic acid) having a weight-average molecular weight of 5,000 or more and 100,000 or less and a low-molecular-weight poly(amic acid) having a weight-average molecular weight of 100 or more and 2,000 or less, and the present invention can provide an electrode binder composition that leads to a secondary battery having a high capacity superior in the initial charge/discharge efficiency and the cycle characteristics.

Electrode binder composition and electrode

A secondary battery having an improved life characteristics is provided by the use of a positive electrode active material for a secondary battery, comprising (a) a surface layer comprising a lithium metal composite oxide having a spinel crystal structure represented by space group Fd-3m, and (b) an internal portion comprising a lithium metal composite oxide having a spinel crystal structure represented by space group P432.

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

A negative electrode active material comprising silicon oxide satisfying the following Equation 1 and Equation 2 when solid state NMR (Si-DDMAS) of silicon is measured for the silicon oxide after performing charging at least once is excellent in the performance as a negative electrode active material for a lithium secondary battery;0.42&#x2264;1/(1+2+3)&#x2264;0.55&#x2003;&#x2003;(Equation 1)0.21&#x2264;3/(1+2+3)&#x2264;0.26,&#x2003;&#x2003;(Equation 2)in which S1 is a sum of peak areas of a group of signals assigned to Si having a Si&#x2014;Si bond and having peaks at 0 to &#x2212;15 ppm, &#x2212;55 ppm, &#x2212;84 ppm and &#x2212;88 ppm, S2 is a sum of peak areas of a group of signals assigned to Si having a Si(OH)(OSi)(n=3, 4) structure and having peaks at &#x2212;100 ppm and &#x2212;120 ppm, and S3 is a sum of peak areas of a group of signals assigned to Si having a Si(OLi)(OSi)(n=0, 1, 2, 3) structure and having peaks at &#x2212;66 ppm, &#x2212;74 ppm, &#x2212;85 ppm and &#x2212;96 ppm.

Negative electrode active material, method for manufacturing same, and lithium secondary battery

Disclosed is a polylactic acid resin composition having excellent bleed resistance and molecular weight retention ratio. A polylactic acid resin molded body is also disclosed. The polylactic acid resin composition contains a polylactic acid resin (a), a metal hydrate (b) having an alkali metal-containing substance content of not more than 0.2% by mass, and a phosphazene derivative (c). The polylactic acid resin molded body is obtained by molding the polylactic acid resin composition. Specifically, a polylactic acid molded body can be produced by filling a melt of the polylactic acid resin composition into a mold at a temperature in the range from glass transition temperature of said polylactic acid resin (a) to 110&#xb0; C. and molding the melt therein.

Polylactic acid resin composition and polylactic acid resin molded body

A secondary battery according to the present exemplary embodiment is a secondary battery including a laminated electrode body provided with at least one pair of positive and negative electrodes and an outer enclosure that accommodates the laminated electrode body, wherein the outer enclosure includes one or more concave portions, inside a border corresponding to an outer edge of an electrode surface of an outermost layer of the laminated electrode body, on a surface facing the electrode surface, and wherein, when a band-shaped outer circumferential region having an area that is a half of an area inside the border is set inside the border, at least one of the concave portions is located inside the outer circumferential region.

Secondary battery

The present invention provides a polylactic acid resin composition, containing a polylactic acid resin and a metal hydrate surface-treated with at least one silane coupling agent selected from an amino-silane coupling agent, a mercapto-silane coupling agent and an isocyanate-silane coupling agent, wherein the content of an alkali metal component in the metal hydrate is not more than 0.2% by mass and a polylactic acid resin molded article produced by molding the polylactic acid resin composition.

Polylactic acid resin composition

A polylactic acid based resin composition includes a polylactic acid based resin (A), a flame retardant (B) and a carbodiimide compound (C), the flame retardant (B) including at least a phosphorus compound (b1) having a phosphaphenanthrene skeleton and a hydroxy group, and the carbodiimide compound (C) including at least an aliphatic carbodiimide.

Growing community of inventors

Tokyo, Japan

Shin Serizawa