NEGATIVE ELECTRODE MATERIAL FOR LITHIUM SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a negative electrode material for lithium secondary battery which can prevent separation of the coating containing Sn-Cu or Sn-Cu alloy intermetallic compound from the current collector by absorbing and relaxing stress generated at expansion and shrinking of the negative electrode at charge and discharge and which is improved in charge and discharge cycle characteristics.

SOLUTION: This is a negative electrode material for lithium secondary battery having a coating layer at the current collector, and the coating layer is a granular rough plated film of Cu formed on the current collector and an Sn alloy plated film having a minute convex shape part including at least a curved face portion formed on top of it.

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