Non-aqueous electrolyte secondary battery and method for producing same

摘要

Provided is a non-aqueous electrolyte secondary battery in which the effect achieved by adding an oxalate complex compound is suitably exhibited and which can achieve battery characteristics during normal usage and resistance to overcharging at high levels. This battery is provided with an electrode body obtained by laminating a positive electrode having a positive electrode active material layer and a negative electrode having a negative electrode active material layer. A coating film which is derived substantially from an oxalate complex compound and which contains boron atoms and/or phosphorus atoms is formed on the negative electrode active material layer. In addition, in the negative electrode active material layer that constitutes the electrode body, the standard deviation (σ) of resistance values, which are measured at a plurality of points at equal intervals in a line direction extending linearly from one prescribed layering surface to the layering surface on the opposite side, is 3.0 to 7.2.

主权项

1. A non-aqueous electrolyte secondary battery comprising an electrode body and a non-aqueous electrolyte, wherein
the electrode body is obtained by laminating a positive electrode having a positive electrode active material layer and a negative electrode having a negative electrode active material layer, with a separator interposed therebetween, the negative electrode active material layer comprises a coating film which is derived substantially from an oxalate complex compound and which contains boron atoms and/or phosphorus atoms, and in at least a part of the negative electrode active material layer, the standard deviation (σ) of resistance values, which are measured at a plurality of measurement points at equal intervals on a line extending linearly from one edge towards the other edge in the direction of impregnating the negative electrode active material layer with the non-aqueous electrolyte, is 3.0Ω to 7.2Ω.