NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY AND METHOD FOR PRODUCING SAME OF FABRICATING SAME

摘要

The present invention provides a non-aqueous electrode secondary battery supplied with a non-aqueous electrolyte comprising an overcharge additive. The positive electrode material layer constituting the positive electrode in the non-aqueous electrolyte secondary battery is characterized by having a differential pore volume peak A as well as a peak B located on the smaller pore diameter side than the peak A in a pore diameter range of 0.05 μm to 2 μm in a pore size distribution curve measured by a mercury porosimeter, wherein the pore size distribution curve has a minimum C corresponding to a minimum differential pore volume between the peak A and the peak B, such that a ratio (XC/XL) of the minimum C's differential pore volume XC to a differential pore volume XL, which is the larger between the peak A's differential pore volume XA and the peak B's differential pore volume XB is 0.6 or larger.

主权项

1. A non-aqueous electrolyte secondary battery comprising:
a positive electrode having a positive electrode material layer; and a non-aqueous electrolyte comprising an overcharge additive, wherein the positive electrode material layer has two differential pore volume peaks A and B in a pore diameter range of 0.05 μm to 2 μm in a pore size distribution curve measured by a mercury porosimeter, the peak B located on a smaller pore diameter side than the peak A in the pore size distribution curve, the pore size distribution curve has a minimum C corresponding to a minimum differential pore volume value between the differential core volume peaks A and B, and a ratio (XC/XL) of a differential pore volume XC of the minimum C to a differential pore volume XL is 0.6 or larger, the differential pore volume XL being the larger differential pore volume between a differential pore volume XA of the differential pore volume peak A and a differential pore volume XB of the differential pore volume peak B.