A non-aqueous electrolyte secondary cell provided with: a positive electrode that has a positive electrode active material; a negative electrode; and a non-aqueous electrolyte. The positive electrode active material contains a lithium composite oxide containing Ni, and the non-aqueous electrolyte contains a non-aqueous solvent containing a fluorinated chain carboxylic acid ester and an organochlorine compound. The organochlorine compound is represented by general formula CF.sub.3CH.sub.2CO—CClR.sub.1R.sub.2 (where in the formula, R.sub.1 and R.sub.2 are respectively independent, and are selected from a hydrogen, a halogen, a C1-2 alkyl group, or a C1-2 halogenated alkyl group).

A non-aqueous electrolyte secondary cell provided with: a positive electrode that has a positive electrode active material; a negative electrode; and a non-aqueous electrolyte. The positive electrode active material contains a lithium composite oxide containing Ni, and the non-aqueous electrolyte contains a non-aqueous solvent containing a fluorinated chain carboxylic acid ester and an organochlorine compound. The organochlorine compound is represented by general formula CF.sub.3CH.sub.2CO—CClR.sub.1R.sub.2 (where in the formula, R.sub.1 and R.sub.2 are respectively independent, and are selected from a hydrogen, a halogen, a C1-2 alkyl group, or a C1-2 halogenated alkyl group).

A non-aqueous electrolyte secondary cell provided with: a positive electrode that has a positive electrode active material; a negative electrode; and a non-aqueous electrolyte. The positive electrode active material contains a lithium composite oxide containing Ni, and the non-aqueous electrolyte contains a non-aqueous solvent containing a fluorinated chain carboxylic acid ester and an organochlorine compound. The organochlorine compound is represented by general formula CF.sub.3CH.sub.2CO-CClR.sub.1R.sub.2 (where in the formula. R.sub.1 and R.sub.2 are respectively independent, and are selected from a hydrogen, a halogen, a C1-2 alkyl group, or a C1-2 halogenated alkyl group).

A non-aqueous electrolyte secondary cell provided with: a positive electrode that has a positive electrode active material; a negative electrode; and a non-aqueous electrolyte. The positive electrode active material contains a lithium composite oxide containing Ni, and the non-aqueous electrolyte contains a non-aqueous solvent containing a fluorinated chain carboxylic acid ester and an organochlorine compound. The organochlorine compound is represented by general formula CF.sub.3CH.sub.2CO-CClR.sub.1R.sub.2 (where in the formula. R.sub.1 and R.sub.2 are respectively independent, and are selected from a hydrogen, a halogen, a C1-2 alkyl group, or a C1-2 halogenated alkyl group).