NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

Provided is a nonaqueous electrolyte secondary battery in which the following are housed in a battery case: a nonaqueous electrolyte, a boron atom-containing oxalato complex compound, and an electrode assembly in which a positive electrode having a positive electrode active material and a negative electrode having a negative electrode active material are disposed facing each other. Here, a coat containing boron atoms originating from the oxalato complex compound is formed on the surface of the negative electrode active material, and the amount BM (μg/cm2) of the boron atom as measured based on inductively coupled plasma-atomic emission spectroscopic analysis and the intensity BA for a tricoordinate boron atom as measured based on x-ray absorption fine structure analysis satisfy 0.5≦BA/BM≦1.0.

主权项

1. A nonaqueous electrolyte secondary battery in which
an electrode assembly in which a positive electrode having a positive electrode active material and a negative electrode having a negative electrode active material are disposed facing each other, a nonaqueous electrolyte, and a boron (B) atom-containing oxalato complex compound are housed in a battery case, wherein a coat containing boron (B) atoms that originate from the oxalato complex compound is formed on the surface of the negative electrode active material, and the ratio on the surface of the negative electrode active material between an amount BM (μg/cm2) of the boron atom, as measured based on inductively coupled plasma-atomic emission spectroscopy (ICP-AES), and an intensity BA for a tricoordinate boron (B) atom, as measured based on x-ray absorption fine structure (XAFS) analysis, is 0.5≦BA/BM≦1.0.