Sony Corporation

Kenta Yamamoto

Yuri Nakayama

Kuniyasu Oya

Osamu Takahashi

Kazuo Honda

Yui Senda

Naoko Yamakawa

Takeshi Miyazaki

Takayuki Ito

Yoshihiro Kudo

Ryosuke Takagi

Hidetoshi Ito

Reina Ito

Hideki Oki

A secondary battery capable of safely improving a battery performance is provided. An electrolyte with which a separatoris impregnated contains an alkyl sulfone and a low-polar solvent (a solvent having a relative permittivity of 20 or less) together with an aluminum salt. The alkyl sulfone facilitates the redox reaction of aluminum, and further reduces the reactivity of the electrolyte. Additionally, the low-polar solvent suppresses the block of the redox reaction of aluminum. In charge and discharge, it becomes easy to electrochemically efficiently precipitate and dissolve aluminum, and further to inhibit the corrosion of a metallic exterior package member or the like.

Electrolyte and secondary battery

A Mg battery has a positive-electrode can, a positive-electrode pellet made of a positive-electrode active material or the like, a positive electrode composed of a metallic net supporting body, a negative-electrode cup, a negative electrode made of a negative-electrode active material, and a separator impregnated with an electrolytic solution and disposed between the positive-electrode pellet and the negative-electrode active material. By adopting a structure that copper contacts the positive-electrode active material, the electrochemical device can be given a large discharge capacity.

Magnesium battery comprising positive-electrode mixture with graphite fluoride and copper

The invention provides a high-capacity positive electrode active material capable of sufficiently exploiting the excellent characteristics of magnesium metal or the like as a negative electrode active material, such as high energy capacity; a method for producing the same; and an electrochemical device using the positive electrode active material. A positive electrodeincludes a positive electrode can, a positive pole pellethaving a positive electrode active material and the like, and a metal mesh support. A negative electrodeincludes a negative electrode capand a negative electrode active materialsuch as magnesium metal. The positive electrode pelletand the negative electrode active materialare disposed so as to sandwich a separator, and an electrolyteis injected into the separator. The positive electrode active material, which provides the feature of the invention, is synthesized by a step of reacting a permanganate, such as potassium permanganate, with hydrochloric acid preferably having a concentration of 3 to 4 mol/l to produce a precipitate, and a step of filtering the precipitate, thoroughly washing the filtered precipitate with water, and then subjecting the washed precipitate to heat treatment preferably at a temperature of 300 to 400&#xb0; C. for not less than 2 hours, thereby giving a manganese oxide.

Positive electrode active material, method for producing the same, and electrochemical device

A secondary battery includes: a cathode; an anode; and an electrolytic solution. The anode includes a lithium composite oxide represented by following Formula (1),LiZnSnMO&#x2003;&#x2003;(1)where M is one or more of Co, Mg, Ni, Ca, Al, Ti, V, Cr, Mn, Fe, Cu, and Ag; and w to z satisfy 0.3&#x2266;w&#x2266;1, 0.3&#x2266;x&#x2266;1, 0.8&#x2266;y&#x2266;1.2, and (w+x+y+z)=3.

Active material, electrode, secondary battery, battery pack, electric vehicle, electric power storage system, electric power tool, and electronic apparatus

A magnesium battery () is constituted of a negative electrode (), a positive electrode () and an electrolyte (). The negative electrode () is formed of metallic magnesium and can also be formed of an alloy. The positive electrode () is composed of a positive electrode active material, for example, a metal oxide, graphite fluoride ((CF)) or the like, etc. The electrolytic solution () is, for example, a magnesium ion-containing nonaqueous electrolytic solution prepared by dissolving magnesium(II) chloride (MgCl) and dimethylaluminum chloride ((CH)AlCl) in tetrahydrofuran (THF). In the case of dissolving and depositing magnesium by using this electrolytic solution, the following reaction proceeds in the normal direction or reverse direction.  According to this, there are provided a magnesium ion-containing nonaqueous electrolytic solution having a high oxidation potential and capable of sufficiently bringing out excellent characteristics of metallic magnesium as a negative electrode active material and a method for manufacturing the same, and an electrochemical device with high performances using this electrolytic solution.

Magnesium ion-containing nonaqueous electrolytic solution and method for manufacturing the same, and electrochemical device

A magnesium ion containing non-aqueous electrolyte in which magnesium ions and aluminum ions are dissolved in an organic etheric solvent, and which is formed by: adding metal magnesium, a halogenated hydrocarbon RX, an aluminum halide AlY, and a quaternary ammonium salt RRRRNZto an organic etheric solvent; and applying a heating treatment while stirring them (in the general formula RX representing the halogenated hydrocarbon, R is an alkyl group or an aryl group, X is chlorine, bromine, or iodine, in the general formula AlYrepresenting the aluminum halide, Y is chlorine, bromine, or iodine, in the general formula RRRRNZrepresenting the quaternary ammonium salt, R, R, R, and Rrepresent each an alkyl group or an aryl group, and Zrepresents chloride ion, bromide ion, iodide ion, acetate ion, perchlorate ion, tetrafluoro borate ion, hexafluoro phosphate ion, hexafluoro arsenate ion, perfluoroalkyl sulfonate ion, or perfluoroalkyl sulfonylimide ion.

Magnesium ion-containing non-aqueous electrolyte and a production process thereof, as well as electrochemical device

A nonaqueous electrolytic solution containing magnesium ions which shows excellent electrochemical characteristics and which can be manufactured in a general manufacturing environment such as a dry room, and an electrochemical device using the same are provided. A Mg battery has a positive-electrode can, a positive-electrode pelletmade of a positive-electrode active material or the like, a positive electrodecomposed of a metallic net supporting body, a negative-electrode cup, a negative electrodemade of a negative-electrode active material, and a separatorimpregnated with an electrolytic solutionand disposed between the positive-electrode pellet and the negative-electrode active material. Metal Mg, an alkyl trifluoromethanesulfonate, a quaternary ammonium salt or/and a 1,3-alkylmethylimidazolium salt, more preferably, an aluminum halide are added to an ether system organic solvent and are then heated, and thereafter, more preferably, a trifluoroborane-ether complex salt is added thereto, thereby preparing the electrolytic solution. By adopting a structure that copper contacts the positive-electrode active material, the electrochemical device can be given a large discharge capacity.

Nonaqueous electrolytic solution containing magnesium ions, and electrochemical device using the same

A battery capable of improving the constant output discharge capacity is provided. A battery includes a cathode, an anode, and an electrolyte. The cathode contains iron sulfide. The anode contains lithium metal or a lithium alloy. A ratio of a discharge capacity per unit area of the cathode to a discharge capacity per unit area of the anode (the discharge capacity per unit area of the cathode/the discharge capacity per unit area of the anode) is more than 1 and 1.4 or less.

Battery

A size AA alkaline battery includes an anode principally composed of zinc functioning as an active material, a cathode principally composed of manganese dioxide or nickel oxyhydroxide functioning as an active material, a separator composed of a nonwoven fabric, an electrolyte composed of an aqueous solution of potassium hydroxide, and zinc oxide.

Size AA alkaline battery

The present invention provides a nickel-zinc battery of an inside-out structure, that is, a battery comprising a positive electrode containing beta-type nickel oxyhydroxide and a negative electrode containing zinc and having a similar structure to an alkali manganese battery, in which the beta-type nickel oxyhydroxide consists of substantially spherical particles, mean particle size of which is within a range from 19 &#x3bc;m to a maximum of 40 &#x3bc;m, the bulk density of which is within a range from 1.6 g/cmto a maximum of 2.2 g/cm, tap density of which is within a range from 2.2 g/cmto a maximum of 2.7 g/cm, specific surface area which based on BET method is within a range from 3 m/g to a maximum of 50 m/g, and the positive electrode of the nickel zinc battery contains graphite powder, where the weight ratio of graphite powder against a total weight of the positive electrode is defined within a range from 4% to a maximum of 8%.

Positive electrode material and nickel-zinc battery

The present invention provides a nickel-zinc battery of an inside-out structure, that is, a battery comprising a positive electrode containing beta-type nickel oxyhydroxide and a negative electrode containing zinc and having a similar structure to an alkali manganese battery, in which the beta-type nickel oxyhydroxide consists of substantially spherical particles, mean particle size of which is within a range from 19 &mgr;m to a maximum of 40 &mgr;m, the bulk density of which is within a range from 1.6 g/cm to a maximum of 2.2 g/cm , tap density of which is within a range from 2.2 g/cm to a maximum of 2.7 g/cm , specific surface area which based on BET method is within a range from 3 m /g to a maximum of 50 m /g, and the positive electrode of the nickel zinc battery contains graphite powder, where the weight ratio of graphite powder against a total weight of the positive electrode is defined within a range from 4% to a maximum of 8%.

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Kanagawa, Japan

Kenta Yamamoto