Sanyo Electric Co., Ltd.

Nobuhiro Nishiguchi

Seiji Yoshimura

Masahiro Imanishi

Shin Fujitani

Hiroshi Nakajima

Maruo Kamino

Taeko Ota

Seiji Morita

Koji Nishio

Yuji Yamamoto

Toshihiko Saito

Yoshihiro Shoji

Satoru Naruse

Katsuyuki Kida

Keiichi Tsujioku

Yoshitaka Minamida

Minoru Fujimoto

Satoru Fukuoka

Masayuki Muraki

Shoichi Inamine

The present invention provides a cell that does not impair heat resistant safety and electrochemical characteristics such as a discharge characteristic, and enhances long-period reliability. In the cell of the present invention, a nonaqueous solvent has, among compounds represented by the following general formula (1), at least one solvent having a boiling point of 200&#xb0; C. or higher, and has, among compounds represented by the following general formula (1), at least one solvent having a boiling point of lower than 200&#xb0; C.; and the total volume ratio at 23&#xb0; C. of the compounds represented by the following general formula (1) is 95 to 100 percent of the nonaqueous solvent,X&#x2014;(O&#x2014;CH)n-O&#x2014;Y&#x2003;&#x2003;(1)(where X and Y are independently an alkyl group (number of carbons: 1-4), and n is 1-5).

Heat resistant lithium cell

A lithium battery employs for a battery separator and a battery insulating packing and the like a battery polymeric material comprising repeating units wherein p-phenylene is combined with one type of group selected from the group composed of oxygen, a methylene group, an isopropylidene group, a carbonyl group, a carbonyldioxy group, a carboxylic acid anhydride group, an amide group, an ureylene group and a sulfonyl group, or a polymeric material comprising at least two types of repeating units wherein p-phenylene is combined with one type of group selected from the group composed of oxygen, a methylene group, an isopropylidene group, a carbonyl group, a carbonyldioxy group, a carboxylic acid anhydride group, an amide group, an ureylene group, a sulfonyl group, sulfur and a carbonyloxy group.

Battery polymeric material, battery separator, battery insulating packing, and lithium battery

A printed circuit board with a coin type electric element of the present invention has the coin type electric element, and printed circuit board, on which the coin type electric element is fixed by soldering. The coin type electric element have a coin exterior case formed of metal and in a coin shape with an opening; a sealing plate, which is fixed on the opening of the coin exterior case, sealing the coin exterior case; and an insulating seal interposed between the coin exterior case and the sealing plate. The coin exterior case and the sealing plate are composed of a pair of terminals, A lead, whose tip portion is bent toward a surface side of a first terminal face, is connected to a second terminal face of the coin type electric element. A soldering face to be soldered by reflow soldering is provided at the tip portion.

Coin type electric element and printed circuit board with a coin type electric element

A lithium battery comprising a positive electrode comprising a positive-electrode active material of boron-containing lithium-manganese complex oxide, a negative electrode and a nonaqueous electrolyte containing a solute and a solvent, the positive-electrode active material is the boron-containing lithium-manganese complex oxide having a boron-to-manganese atomic ratio (B/Mn) in the range of 0.01 to 0.20 and a predischarge mean manganese valence of not less than 3.80

Lithium battery with boron-containing lithium-manganese complex oxide cathode material

A lithium battery comprising a positive electrode, a negative electrode and a nonaqueous electrolyte containing a a solute and a solvent, wherein the positive electrode comprises a positive-electrode active material of lithium-manganese complex oxide containing boron and phosphorus.

Lithium battery comprising a positive electrode material of lithium-manganese complex oxide containing boron and phosphorus

A lithium secondary battery comprises a negative electrode having lithium as an active material, a positive electrode comprising a boron-containing lithium-manganese composite oxide as an active material and a nonaqueous electrolyte comprising a solute and a solvent, the boron-containing lithium-manganese composite oxide having an atomic ratio between B and Mn (B/Mn) of 0.01 to 0.20 and an average valence of manganese before charge-discharge of at least 3.80, and the solvent being a mixed solvent containing 5 to 50% by volume of a butylene carbonate. This battery is highly reliable, since the positive electrode active material minimally decomposes and hence the internal resistance minimally increases, even when the battery is continuously charged at a high voltage by mistake.

Lithium secondary battery

Growing community of inventors

Sumoto, Japan

Nobuhiro Nishiguchi