Non-aqueous electrolyte secondary battery

Abstract

The invention provides a non-aqueous electrolyte secondary battery, under the situation that the non-aqueous electrolyte secondary battery using lithium-containing metal composite oxides comprising lots of nickel in anode active substances is stored in a charging state, the non-aqueous electrolyte secondary battery can avoid the reaction between the anode active substances and non-aqueous electrolyte and further prevent expansion of the battery, and at the same time inhibit reduction of capacity of the non-aqueous electrolyte secondary battery. The invention is a non-aqueous electrolyte secondary battery which includes the anode (11) and the cathode (12) of the anode active substances made of lithium-containing metal composite oxides and having laminated structure, and which has the non-aqueous electrolyte for dissolving the electrolyte in a non-aqueous solvent, characterized in that the anode active substances comprising more than 50 mol% of nickel in the metals of the lithium-containing metal composite oxides other than lithium is used, and cyclic ether is added to the non-aqueous electrolyte simultaneously in the range from 0.1 to 2 volume%.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery provided with a positive electrode, a negative electrode, and a nonaqueous electrolytic solution in which an electrolyte is dissolved in a nonaqueous solvent, using a positive electrode active material composed of a lithium-containing metal composite oxide having a layered structure. In a non-aqueous electrolyte secondary battery that uses a lithium-containing metal composite oxide containing a large amount of nickel in the positive electrode active material in order to achieve a high capacity of the battery, when it is stored in a charged state, the expansion of the battery can be prevented, And at the same time, it is possible to suppress the decrease in battery capacity. Background technique [0002] In recent years, non-aqueous electrolyte secondary batteries that use a non-aqueous electrolyte solution to move lithium ions between a positive electrode and a negative electro...

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Problems solved by technology

[0008] However, as shown in Patent Document 1, even in the case of using a nonaqueous electrolyte secondary battery in which the amount of lithium carbonate is reduced so that the pH value becomes in the range of 10 to 11.5, in the charged state as described above, in a high temperature environment In the case of storage, the reaction between the positive electrode active material and the non-aqueous electrolyte cannot be sufficiently suppressed, and the problem of battery swelling still exists.

[0009] In addition, as shown in Patent Document 2, in the case of washing a positive electrode active material composed of a lithium-containing metal composite oxide containing a large amount of nickel with water, and storing it in a high-temperature environment in a charged state, although the positive electrode is inhibited The active material reacts with the non-aqueous electrolyte, but washing with water causes the amount of nickel contained in the lithium-containing metal composite oxide to enter the lithium side to increase, and the resistance on the surface of the positive electrode active material increases, and the discharge performance decreases, making it impossible to obtain high capacity. non-aqueous electrolyte secondary battery

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