| abstract |
Provided are a nonaqueous electrolyte secondary battery capable of obtaining a large battery capacity and a high output while suppressing Li deposition on a negative electrode during high potential conversion, and a method for producing the nonaqueous electrolyte secondary battery. In a non-aqueous electrolyte battery including a positive electrode, a negative electrode, and a non-aqueous electrolyte, the positive electrode has an α-NaFeO 2 type crystal structure and a composition formula Li 1 + α Me 1-α O 2 (Me is Co, Ni and A transition metal element containing Mn, having a positive electrode active material containing a lithium transition metal composite oxide represented by α> 0), and the negative electrode contains a carbon material that is a mixture of graphite and amorphous carbon And it has the negative electrode active material whose ratio of the said amorphous carbon contained in the said carbon material is 5-60 mass%. In addition, this non-aqueous electrolyte secondary battery manufacturing method has a positive charge potential range of 4.3 V (vs. Li / Li + ) to 4.8 V (vs. Li / Li + ) or less. In contrast, the method includes a charging step in which a potential change that appears at least reaches a relatively flat region. [Selection] Figure 1 |