| 摘要 |
A lithium secondary battery employing as its negative electrode active material a material that increases in volume by alloying with lithium during charge achieves high discharge capacity and good cycle performance. The lithium secondary battery includes a negative electrode having a negative electrode active material ( 2 ) and a negative electrode current collector, a positive electrode having a positive electrode active material ( 1 ) and a positive electrode current collector ( 3 ), and a non-aqueous electrolyte. The negative electrode active material ( 2 ) is a material that increases in volume by alloying with lithium during charge. The negative electrode active material ( 1 ) is arranged so as to be on, and in contact with, the negative electrode current collector. The negative electrode active material ( 2 ) contains, when in an end-of-discharge condition, 8% or more of lithium with respect to the total capacity of the negative electrode active material ( 2 ) as measured when it does not contain lithium.
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