Toyota Jidosha Kabushiki Kaisha

Ryo Hanasaki

Koji Takahata

Takashi Harayama

Masahiro Morita

Atsushi Watarai

Yusuke Onoda

Kenta Ishii

Risa Sato

A nonaqueous electrolyte secondary battery includes: an electrode assembly; a nonaqueous electrolyte; and a battery case. The electrode assembly includes a positive electrode, a negative electrode, and a separator. The positive electrode includes a positive electrode active material layer. The negative electrode includes a negative electrode active material layer. The separator is interposed between the positive electrode and the negative electrode. The battery case accommodates the electrode assembly and the nonaqueous electrolyte. Ends of contact faces of the negative electrode active material layer and the separator are at least partially bonded to each other.

Nonaqueous electrolyte secondary battery and manufacturing method therefor

According to the present disclosure, there is provided a technique making it possible to improve suitably the performance of a nonaqueous electrolyte secondary cell in which a SEI film is formed on the surface of a negative electrode active material. The nonaqueous electrolyte secondary cell disclosed herein includes a positive electrode, a negative electrode, and a nonaqueous electrolytic solution, wherein a negative electrode SEI filmincluding at least a LiBOB skeleton and a fluorosulfonic acid skeleton is formed on the surface of a negative electrode active material, and a positive electrode SEI filmincluding at least a phosphoric acid skeleton is formed on the surface of a positive electrode active material. Where the component amount of the LiBOB skeleton in the negative electrode SEI filmis denoted by I, the component amount of the fluorosulfonic acid skeleton in the negative electrode SEI filmis denoted by I, and the component amount of the phosphoric acid skeleton in the positive electrode SEI filmis denoted by I, a formula of 4&#x2264;I/I&#x2264;10 and a formula of 5 &#x3bc;mol/m&#x2264;I&#x2264;15 &#x3bc;mol/mare satisfied.

Nonaqueous electrolyte secondary cell and method for manufacturing nonaqueous electrolyte secondary cell

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Toyota, Japan

Ryo Hanasaki