A lithium-ion secondary battery, its manufacturing method, a negative electrode for a rechargeable

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PROBLEM TO BE SOLVED : To provide a lithium secondary battery negative electrode and a negative electrode material used for the negative electrode which are superior in the initial charge and discharge efficiency and in which cycle deterioration due to charge and discharge is suppressed and high discharge capacity is realized, and their manufacturing method and a lithium secondary battery having the negative electrode. SOLUTION : The negative electrode material contains an alloy having the composition of the formula (1) (Li)x(R)y(Sn)z(Ma)w(Mb)v and its manufacturing method comprises a process (a) for manufacturing the molten alloy having the composition of the formula (1), a process (b) for cooling and solidifying the molten alloy, and a process (c) for holding the cooled and solidified alloy for one minutes to 100 hours in the temperatures of 100-1150°C in a rare gas and/or hydrogen gas of 0.07-10 MPa. In the formula, R is a lanthanoid-series element or the like, Ma is B, C, Si or the like, and Mb is Ti, V, Cr or the like and Ma≠Mb. 0≤x≤13, 0.70≤y≤1.10, 2.20≤z≤3.50, 0≤w≤0.70, 0≤v≤0.70, and 0≤w+v≤0.70. COPYRIGHT : (C)2004, JPO