Japan Synthetic Rubber Co., Ltd.

Jm Energy Corporation

Other

Matsushita Electric Industrial Co., Ltd.

Naoshi Yasuda

Shigeo Kondo

Makoto Taguchi

Masaki Nagata

Nobuo Ando

Yuu Watanabe

Kazuya Iwamoto

Yasumasa Takeuchi

Tadashi Sotomura

Kazunori Takada

Fusazumi Masaka

Yasuo Matsuki

Toshihiro Hayashi

Takashi Chiba

Teruaki Tezuka

Eisuke Sugimoto

Chisato Marumo

Kuniyasu Hiraiwa

Kazuyoshi Okada

Nobuhito Imanaka

Ginya Adachi

Yoshihiko Sadaoka

Hiromichi Aono

Takeo Hara

Hideki Chiba

Hisao Igarashi

A wound-type accumulator is equipped with a cylindrical wound electrode unit, which has belt-like positive electrode and negative electrode and configured by winding an electrode stack obtained by stacking the positive electrode and negative electrode through a separator from one end thereof, and an electrolytic solution. The negative electrode and/or the positive electrode is doped with lithium ions by electrochemical contact of the negative electrode and/or the positive electrode with a lithium ion source, intra-positive electrode spaces are formed in the positive electrode, and at least one lithium ion source is provided in the intra-positive electrode space or at a position opposing to the intra-positive electrode space in the negative electrode in a state coming into no contact with the positive electrode.

Wound-type accumulator having simplified arrangement of a lithium ion source

Provided is a lithium ion capacitor that can maintain a high capacity retention rate and suppress an increase in internal resistance even after high-load charging-discharging is repeated many times and that has long service life because the occurrence of a short circuit due to precipitation of lithium on the negative electrode is prevented. The lithium ion capacitor comprises a positive electrode, a negative electrode, and an electrolyte solution, the negative electrode including a current collector and electrode layers that contain a negative electrode active material and are formed on front and back surfaces of the current collector, wherein, in the negative electrode, ratios of deviations of respective thicknesses of the electrode layers formed on the front and back surfaces of the current collector from an average of the thicknesses of the electrode layers to the average is &#x2212;10 to 10%.

Lithium ion capacitor

Provided is a lithium ion capacitor having a low internal resistance, a high energy density, and a high capacity retention rate. The lithium ion capacitor includes a positive electrode having a positive electrode active material layer formed on a roughened positive electrode current collector, a negative electrode having a negative electrode active material layer containing graphite-based particles formed on a negative electrode current collector, and an electrolytic solution containing a solution of a lithium salt in an aprotic organic solvent, wherein the total thickness of the positive electrode active material layer is 50 &#x3bc;m to 140 &#x3bc;m, and the ratio of mass of the positive electrode active material layer to the sum of the mass of the positive electrode active material layer and that of the negative electrode active material layer is 0.4 to 0.5.

A laminate-packaged electric storage device includes an outer package, an electric storage device element, and an electrolyte solution, the outer package formed by stacking and seal-tight bonding outer package films along a bonding section formed in an outer edge area of the outer package films, the electric storage device element and the electrolyte solution being held in a receiving section formed inside the outer package. A non-bonding section surrounded by the bonding section and communicating with the receiving section is formed in the outer edge area, an opening is formed through at least one outer package film, and a seal section is formed to surround the opening formed in an area of the non-bonding section, the outer package films bonded in the seal section, and the opening formed in the area of the non-bonding section at a position other than a center position.

Laminate outer packaging storage device

A molded solid electrolyte, a molded electrode and an electrochemical device which contain a polymer composition consisting of 50 to 100 wt % of 1,2-polybutadiene having a 1,2-vinyl content of 70% or more and a crystallinity of 5 to 50%, and 0 to 50 wt % of polar rubber. According to the present invention, it becomes possible to obtain a molded solid electrolyte provided with high ionic conductivity and high workability, or a molded electrode having high electrode activity, and it is also possible to obtain an electrochemical device showing excellent activating properties by using the molded solid electrolyte and the molded electrode.

Molded solid electrolyte, molded electrode and electrochemical element

Disclosed are a molded solid electrolyte and molded electrode having excellent electrochemical properties and high procesability. As a binder for these molded articles, a hydrogenated block copolymer is used which is obtained by hydrogenating a straight chain or branched block copolymer containing a block (A) comprising polybutadiene whose 1,2-vinyl bond content is 15% or less and a block (B) comprising a butadiene (co)polymer consisting of 50 to 100% by weight of butadiene and 0 to 50% by weight of other monomers in which 1,2-vinyl bond content of butadiene portion is 20 to 90%, wherein (A)/(B)&equals;5 to 70/95 to 30% by weight.

Solid electrolytic moldings, electrode moldings, and electrochemical elements including a polybutadiene block copolymer

An electroconductive elastomer-forming composition comprising (a) 100 parts by weight of a vinyl group-containing polydimethylsiloxane having a standard polystyrene-reduced molecular weight of 10,000-40,000, (b) 5-50 parts by weight of a hydrosilyl group-containing polydimethylsiloxane having a standard polystyrene-reduced molecular weight of 10,000-40,000 and (c) 30-1,000 parts by weight of electroconductive particles. Said composition can form a conductor of small thickness having good conductivity, excellent heat resistance and excellent durability.

Electroconductive elastomer-forming composition

A lithium ion-conductive solid electrolyte consisting of a compound represented by the chemical formula, Li.sub.1+x M.sub.x Ti.sub.2-x (PO.sub.4).sub.3 (M is at least one element selected from the group consisting of Fe, Al and rare earth elements and x is a number of 0.1 to 1.9), a compound represented by the chemical formula, Li.sub.1+y Ti.sub.2 Si.sub.y P.sub.3-y O.sub.12 (Y is a number of 0.1 to 2.9), or a compound obtained by mixing a compound represented by the chemical formula, LiTi.sub.2 (PO.sub.4).sub.3 with a lithium compound other than LiTi.sub.2 (PO.sub.4).sub.3 and sintering the resulting mixture. Said lithium ion-conductive solid electrolyte can be produced by subjecting to solid phase reaction a mixture of a titanium oxide, a lithium salt, a phosphoric salt and M.sub.2 O.sub.3 (M is at least one element selected from the group consisting of Fe, Al and rare earth elements) or a silicon oxide or a mixture of LiTi.sub.2 (PO.sub.4).sub.3 and other lithium compound. Said lithium ion-conductive electrolyte can be used in the form of a lithium ion-conductive electrolyte sheet to prepare a structure suitable for solid electrochemical elements.

Lithium ion-conductive solid electrolyte containing lithium titanium

A solid electrolyte sheet comprising an ion-conductive inorganic solid electrolyte and an insulating elastomer, wherein the inorganic solid electrolyte powder is uniformly dispersed in the insulating elastomer in a volume fraction of 55-95% and which sheet has a hardness (ASTM A) of 65-96 and a thickness of 10-250 .mu.m, or a solid electrolyte sheet comprising a non-conductive reticulate material and a mixture of an ion-conductive inorganic solid electrolyte powder and an insulating elastomer, in which mixture the solid electrolyte powder is uniformly dispersed in the insulating elastomer in a volume fraction of 55-95%, at least the openings of the reticulate material being filled with said mixture. Said solid electrolyte sheets are superior in ion-conductivity, processability, productivity, storage stability and flexibility and are suitable for use in thin and large electrochemical elements.

Solid electrolyte sheet and process for producing the same

A structure comprising a pair of electrode sheets and an electrolyte sheet, the latter being sandwiched in between the former, wherein each of the pair of electrode sheets comprises a mixture comprising an insulating elastomer and an electrode active substance powder and/or an inorganic solid electrolyte powder, in which mixture the electrode active substance powder and/or the inorganic solid electrolyte powder are dispersed in a volume fraction of 75-95% in the insulating elastomer, and said electrolyte sheet comprises a mixture of an inorganic solid electrolyte powder and an insulating elastomer and optionally an electrode active substance powder, in which mixture the inorganic solid electrolyte powder and optionally the electrode active substance powder are dispersed in a volume fraction of 55-95% in the insulating elastomer. Each of said electrode sheet and said electrolyte sheet may further comprise a reticulate material sheet, the openions of which are filled with the mixture. The structure is excellent in ion-conductivity, processability, productivity, storage stability and flexibility and enables one to make solid electrolyte cells, solid electric double layer capacitors and solid electrochromic display thinner and larger in area.

Growing community of inventors

Komatsu, Japan

Naoshi Yasuda