Importance

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Abstract

In manufacturing of a negative electrode material of a lithium ion secondary battery provided with a negative electrode mixture layer including a negative electrode active substance on a surface of a negative electrode current collector, one or mixture selected from granular materials alloyable with lithium and carbon materials for storing and releasing lithium is used as the negative electrode active substance; manufacturing method of a negative electrode material for a lithium ion secondary battery employed is characterized in that an electro-deposited copper foil in which a surface roughness (Ra) is 0.20 μm50(c)] μm to [0.210×D₅₀(c)] μm where (D₅₀(c)) is an average particle size of the negative electrode active substance is selectively used as the negative electrode current collector; a silane coupling agent treatment layer is provided on a surface of the electro-deposited copper foil.

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First Claim