Method for manufacturing nonaqueous electrolyte secondary cell, and cell assembly
Provided is a method for manufacturing a nonaqueous electrolyte secondary cell which can maintain and demonstrate an excellent cell characteristic over a long period of time. The method for manufacturing a nonaqueous electrolyte secondary cell provided by the present invention includes: a step of preparing a positive electrode having a positive electrode mix layer and a negative electrode having a negative electrode mix layer; and a step of housing the positive electrode and the negative electrode together with a nonaqueous electrolytic solution in a cell case. The nonaqueous electrolytic solution includes a Compound (I) constituted by lithium tris(oxalate)phosphate. When a BET specific surface area of the negative electrode mix layer is denoted by X (m 2 /g) and the amount of the Compound (I) added to the entire amount of the nonaqueous electrolytic solution is denoted by Y (% by mass), the following relationships are satisfied: 3≦X≦4.3; 0.4≦Y≦1.5; and (Y/X)≦0.35.
1. A method for manufacturing a nonaqueous electrolyte secondary cell,
the method comprising:
a step of preparing a negative electrode having a negative electrode mix layer including a carbon material as a negative electrode active material, and a positive electrode having a positive electrode mix layer;
a step of housing the positive electrode and the negative electrode together with a nonaqueous electrolytic solution in a cell case and constructing a cell assembly; and
an initial charging step of performing initial charging processing on the cell assembly, wherein
the nonaqueous electrolytic solution includes a Compound (I) represented by the following Formula (I):
and a BET specific surface area X (m 2 /g) of the negative electrode mix layer and an amount Y (% by mass) of the Compound (I) added to the entire amount of the nonaqueous electrolytic solution satisfy the following relationships:
3≦ X≦ 4.3;
0.4≦ Y≦ 1.5; and
0.13≦( Y/X )≦0.35.
2. A cell assembly before initial charging for constructing a nonaqueous electrolyte secondary cell,
the cell assembly comprising:
a negative electrode having a negative electrode mix layer including a carbon material as a negative electrode active material;
a positive electrode having a positive electrode mix layer;
a nonaqueous electrolytic solution; and
a cell case in which the positive electrode, the negative electrode, and the nonaqueous electrolytic solution are housed, wherein
the nonaqueous electrolytic solution includes a Compound (I) represented by the following Formula (I):
and a BET specific surface area X (m 2 /g) of the negative electrode mix layer and an amount Y (% by mass) of the Compound (I) added to the entire amount of the nonaqueous electrolytic solution satisfy the following relationships:
3≦ X≦ 4.3;
0.4≦ Y≦ 1.5; and
0.13≦( Y/X )≦0.35.