Si alloy powder for negative electrode of lithium-ion secondary cell, and method for manufacturing same
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United States of America Patent
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Jul 19, 2016
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Nov 14, 2013
app pub date -
Jan 16, 2012
filing date -
Jan 17, 2011
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Abstract
There are provided a Si alloy powder for a lithium ion secondary battery negative electrode active material, which has a high discharge capacity and excellent cycle life, and a method for producing the same. The Si alloy powder of the present invention comprises a eutectic structure including a Si phase and a CrSi2 phase, and the average value of thicknesses in a thin width direction in each phase of the Si phase and the CrSi2 phase is 4 μm or less. This Si alloy powder is produced by quenching and solidifying a dissolution material which gives the composition of the Si alloy powder at a cooling rate of 100° C./s or more.
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