Abstract: A method for producing a cathode active material for a non-aqueous electrolyte secondary battery, which comprises the step of heating a mixture of .beta.-Ni(OH).sub.2 and a lithium salt in the presence of oxygen at a temperature ranging from 600.degree. C. to 800.degree. C. to obtain LiNiO.sub.2.

Abstract: A non-aqueous secondary electrochemical battery which comprises a complex oxide containing lithium for a cathode, a carbon material for an anode, and a mixed solvent for an electrolyte is disclosed. The mixed solvent is obtained by dissolving an inorganic salt in a mixture of a cyclic ester and a chain ester. The cyclic ester is selected from the group consisting of ethylene carbonate, propylene carbonate, butylene carbonate, and .gamma.-butyrolactone. The chain ester is selected from the group consisting of diethyl carbonate, dimethyl carbonate, ethyl formate, methyl formate, ethyl acetate, methyl acetate, and dimethyl sulfoxide. In this way, a non-aqueous secondary electrochemical battery having improved cycle life capabilities, discharge performance, and low temperature performance can be obtained.

Abstract: A non-aqueous secondary electrochemical battery which includes a complex oxide containing lithium for a cathode, carbon for an anode, and a mixed solvent for an electrolyte is disclosed. The mixed solvent is obtained by dissolving an inorganic salt in a mixture of a cyclic ester and an asymmetric chain carbonate. The cyclic ester is selected from the group consisting of ethylene carbonate, propylene carbonate, butylene carbonate and .gamma.-butyrolactone. The asymmetric chain carbonate is selected from the group consisting of ethylmethyl carbonate, methylpropyl carbonate and ethylpropyl carbonate. In this way, a non-aqueous secondary electrochemical battery having an improved cycle life capability, discharge performance, and low temperature performance can be obtained.

Abstract: A nonaqueous electrolyte secondary battery having excellent cycle life characteristic, stability in storage at high temperatures and low-temperature characteristic, which is provided with an anode including a carbon material capable of doping and undoping lithium ion, a nonaqueous electrolyte and a cathode including a lithium-containing oxide, the solvent for the nonaqueous electrolyte being a mixed solvent including an aliphatic carboxylate, a cyclic carbonate and a non-cyclic carbonate, with the aliphatic carboxylate being represented by the formula RCOOR' where R represents an alkyl group of three or more carbon atoms and R' represents an alkyl group of one or two carbon atoms and the cyclic carbonate being one of ethylene carbonate and propylene carbonate.

Abstract: A nonaqueous electrolyte secondary battery having excellent cycle life characteristic, stability in storage at high temperatures and low-temperature characteristic, which is provided with an anode including a carbon material capable of doping and undoping lithium ion, a nonaqueous electrolyte and a cathode including a lithium-containing oxide, the solvent for the nonaqueous electrolyte being a mixed solvent including an aliphatic carboxylate, a cyclic carbonate and a chain carbonate, with the aliphatic carboxylate being represented by the formula RCOOR' where R represents an ethyl group and R' represents an alkyl group of 1-3 carbon atoms and the cyclic carbonate being one of ethylene carbonate and propylene carbonate.

Abstract: Provided is a nonaqueous electrolyte secondary battery excellent in cycle life characteristic, stability in storage at high temperatures and low-temperature characteristic which is provided with an anode comprising a carbon material capable of doping and undoping lithium ion, a nonaqueous electrolyte and a cathode comprising a lithium-containing oxide, the solvent for the nonaqueous electrolyte being composed of the three components of an aliphatic carboxylate, a cyclic carbonate and a chain carbonate, the proportion of the aliphatic carboxylate being 10-70% by volume, that of the cyclic carbonate being 20-50% by volume and that of the chain carbonate being 10-70% by volume based on the total solvent.