Sony Corporation

Union Carbide Corporation

Sony-eveready Inc.

Toru Nagaura

Toshio Hashimoto

Shigeru Oishi

Takao Abe

Naoyuki Sugeno

Takayuki Yamahira

Takayuki Aita

Hisayuki Kato

Masanori Anzai

Masaaki Yokokawa

Mochiyuki Watanabe

A nonaqueous electrolyte secondary cell provided with (a) a negative electrode consisting essentially of a carrier for a negative electrode active material , said carrier being capable of being doped and dedoped with lithium, (b) a positive electrode comprising, as an essential positive electrode active material, Li.sub.1+x Mn.sub.2 O.sub.4, wherein x&gt;0, obtained by doping a lithium-manganese complex oxide with lithium and (c) a nonaqueous electrolyte. The secondary cell has an increased cell capacity as well as a high energy density and an excellent charge-discharge characteristics .

Nonaqueous electrolyte secondary cell

A nonaqueous electrolyte secondary batter which comprises a negative electrode which comprises a carbonaceous material capable of doping and de-doping lithium, a positive electrode made of an active material which comprises a Li-containing metal complex oxide of the general formula, Li.sub.x MO.sub.2, wherein M represents at least one member selected from the group consisting of Co, Ni and Mn and 0.5.ltoreq.x.ltoreq.1, and a nonaqueous electrolyte which contains an electrolyte and an organic solvent therefor. The organic solvent is a mixed solvent of propylene carbonate and at least one member selected from the group consisting of diethyl carbonate and dipropyl carbonate.

Nonaqueous electrolyte secondary battery

There is disclosed a non-aqueous electrolyte secondary battery in which carbonaceous material is used as the anode active material and charge/discharge is carried out by doping/undoping of lithium. The carbonaceous material has a grading distribution such that the 10% cumulative or accumulated diameter is 6 to 20 .mu.m, the 50% cumulative diameter is 20 to 55 .mu.m, and the 90% cumulative diameter is 55 to 90 .mu.m. When a carbonaceous material such that the grading distribution satisfies the above condition is used as the anode active material, the self-discharge rate is suppressed and occurrence of an internal short-circuit is also prevented.

Non-aqueous electrolyte secondary battery

A cell having an explosion proof valve is disclosed, in which the valve is deformable upon increase of inner pressure of the cell to cut a connection lead which connects the valve with a generator unit contained in the cell. The supply of charging current is cut off when the inner pressure of the cell has abnormally increased. The gradual increase of the inner pressure can be effected by selecting suitable cathode active material.

Cell having current cutoff valve

An organic electrolyte cell is disclosed which comprises an anode mainly composed of Li and containing Al and a cathode mainly composed of manganese dioxide, wherein the amounts for Li, Al and manganese dioxide are determined such that they are included within a region surrounded by:

Organic electrolyte cell

A rechargeable organic electrolyte cell includes a cathode mainly composed of LiMn.sub.2 O4, obtained by sintering manganese dioxide with either lithium carbonate or lithium iodide.

Rechargeable organic electrolyte cell

An organic electrolyte cell is disclosed which comprises an anode made of Li or Li alloy, an organic electrolyte and cathode active material made of Li and metal complex oxide represented by LiMO.sub.2 wherein M stands for at least one of Co, Ni, Fe, Cr, and V. The cell has a discharge voltage of 1.2 to 1.3 volts which is compatible with mercury cell.

An organic electrolyte cell included an anode composed mainly of lithium, a cathode and an organic electrolyte solution. There are interposed between the anode and the cathode a layer of a powdered material for holding the electrolyte solution therein and a microporous film having numerous micro size pores the ions can pass through.

Alkaline cell comprising a cathode material, an alkaline electrolyte and an anode material, which are sealed in a container, said cathode material containing an Ni- and Ag-containing oxide wherein the trivalent nickel ion (Ni.sup.3+) and the monovalent silver ion (Ag.sup.+) are present in a substantially equimolar ratio.

Growing community of inventors

Fukushima, Japan

Toru Nagaura