NEGATIVE ELECTRODE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY USING IT

摘要

PROBLEM TO BE SOLVED: To provide a negative electrode having excellent cycle characteristics by suppressing increase in impedance of the whole negative electrode using silicon-containing particles capable of charging and discharging at least lithium ions as an active material, and to provide a battery using the negative electrode.

SOLUTION: The negative electrode for a nonaqueous electrolyte secondary battery has a composite negative active material 13 comprising silicon-containing particles 11 capable of absorbing/releasing at least lithium ions and carbon nano-fibers 12; and a mix layer containing an expansion/contraction buffer material 14 having conductivity. The carbon nano-fibers 12 are bonded to the surface of the silicon-containing particles 11.

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