Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Jun Nunome

Fumio Kato

Harunari Shimamura

Yuji Mototani

Hidekazu Hiratsuka

Futoshi Tanigawa

Toshiyuki Shimizu

Kenichi Morigaki

Shigeru Hanaoka

Shinichiro Tahara

Yoshiki Fukuhara

Fumiharu Sakashita

Isamu Saruwatari

Machiko Tsukiji

Kato Fumio

In an alkaline battery in which a positive electrodecontaining manganese dioxide, a negative electrode, and a separatorinterposed therebetween are housed in a closed-end cylindrical battery casewhose opening is sealed with a gasket, a half-width of a 110 plane peak of the manganese dioxide measured by a powder X-ray diffraction analysis is in the range of 1.80-2.40 degrees, and anatase titanium dioxide is contained in the positive electrode such that a ratio of anatase titanium dioxide to the positive electrode is in the range of 0.10-1.50 mass %.

Alkaline battery

A lithium primary battery includes a positive electrodeusing iron sulfide as a positive electrode active material, a negative electrodeusing a lithium alloy as a negative electrode active material, an electrode groupformed by winding the positive and negative electrodeswith a separatorbeing interposed therebetween, and a non-aqueous electrolytic solution. The lithium alloy contains at least one of magnesium or tin in a range of 0.02-0.2 mol %.

Lithium primary battery

In an alkaline battery, a positive electrodecontaining manganese dioxide, a negative electrode, and a separatorinterposed therebetween are housed in a closed-end cylindrical battery casewhose openingis sealed with a gasket. The positive electrode contains graphite in such a manner that a ratio of graphite to the positive electrode is in the range of 2.5-4.3 mass %. A half-width of a 110 plane of the manganese dioxide measured by a powder X-ray diffraction analysis is in the range of 2.00-2.40 degrees.

In an alkaline battery in which an opening of a battery casecontaining a power-generating element is sealed via a sealing platewith a gasketinterposed between the battery caseand the sealing plate, the sealing platehas a vent, the gaskethas an explosion-proof valve, an electrolyte filtermade of a porous membrane is disposed in a space defined by the sealing plateand the gasket, a volume of a space defined by the sealing plateand the electrolyte filteris greater than or equal to 0.25 cm, and a tensile stress of the electrolyte filterat 100% tensile elongation in at least one direction is in a range of 60-4000 N/m.

In an alkaline battery in which a positive electrodemade of manganese dioxide and a negative electrodeare contained in a cylindrical battery casehaving a closed bottom with a separatorinterposed between the positive and negative electrodesand, and an openingof the battery caseis sealed via a sealing plate with a gasketinterposed between the battery caseand the sealing plate, a thickness of a bodyof the battery caseis in a range of 0.10-0.17 mm, and a half-width of a 110 plane of the manganese dioxide measured by powder X-ray diffraction is in a range of 2.30-2.70 degrees.

A lithium primary batteryincludes an electrode group in which a positive electrodehaving iron disulfide as a positive electrode active material and a negative electrodehaving lithium as a negative electrode active material are wound, with a separatorinterposed between the positive electrodeand the negative electrode, wherein a density of the iron disulfide in a positive electrode mixture containing the positive electrode active material is in a range of 2.2-2.9 g/cm, and the separatoris made of a non-woven fabric whose tensile strength is in a range of 6-30 N/mm.

Reducing an initial voltage degrades intermediate-load discharge performance. In a lithium primary battery containing iron disulfide as a positive electrode active material, a solvent of a nonaqueous electrolyte contains DIOX and DME as main components, and further contains THF. Moreover, the content of THF is 20 vol. % or lower.

An AA alkaline battery includes a positive electrode containing larger than or equal to 9.30 g of manganese dioxide. An AAA alkaline battery includes a positive electrode containing larger than or equal to 4.09 g of manganese dioxide. The cumulative pore volume of pores having diameters from 0.97 &#x3bc;m to 10.2 &#x3bc;m, both inclusive, is in the range from 0.0035 ml/g to 0.0070 ml/g, both inclusive, in measurement of pore size distribution in the positive electrode performed by mercury intrusion porosimetry.

AA alkaline battery and AAA alkaline battery

An alkaline battery comprising a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode; and an alkaline electrolyte, wherein the positive electrode includes manganese dioxide and graphite; the cumulative pore volume of pores with diameters of 3 to 5 nm in the manganese dioxide is X (cm/g), and the weight loss rate of the manganese dioxide when heated from 150 to 400&#xb0; C. is Y (%), X and Y satisfying 0.005&#x2266;X&#x2266;0.011, 3.4&#x2266;Y&#x2266;3.9, and &#x2212;16.7X+3.58&#x2266;Y&#x2266;66.7X+3.17; the negative electrode includes zinc; and the alkaline electrolyte includes an aqueous potassium hydroxide solution.

An alkaline battery includes a positive electrode including a positive electrode active material, a negative electrode including a negative electrode active material, and an alkaline electrolyte including potassium hydroxide. The positive electrode active material includes a manganese dioxide powder, and the negative electrode active material includes a zinc powder. In a powder X-ray diffraction pattern of the manganese dioxide powder using CuK&#x3b1; radiation, the diffraction peak attributed to the (110) plane is in the range of 20.5&#xb0; to 21.7&#xb0;, and the ratio of the peak intensity of the (130) plane to the peak intensity of the (021) plane: I(130)/I(021) is 0.1 or less.

In an alkaline battery including a cathode mixture including gamma-manganese dioxide and lambda-manganese dioxide, an anode, and an alkaline electrolyte, the weight ratio of the lambda-manganese dioxide to the gamma-manganese dioxide is set to 0.5/100 to 4.5/100, and the average particle size of the lambda-manganese dioxide is set to 3 to 10 &#x3bc;m. An alkaline battery excellent in high-load discharge performance without decline in low-load discharge performance is provided.

Growing community of inventors

Kyoto, Japan

Jun Nunome