Composite active material for lithium secondary batteries and method for producing same
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United States of America Patent
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Aug 18, 2020
Grant Date -
Jul 7, 2016
app pub date -
Aug 12, 2014
filing date -
Aug 14, 2013
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Abstract
Provided is a production method for a composite active material for lithium secondary batteries which enables production of an electrode material in which volume expansion is suppressed even after repeated charging and discharging, and enables production of a lithium secondary battery exhibiting excellent cycle characteristics. A composite active material for lithium secondary batteries is produced using a mixing step of mixing graphite having a specific surface area of not less than 30 m2/g, silicon monoxide, and a carbon precursor to obtain a mixture; a conglobation step of performing conglobation treatment on the mixture and obtaining a spherical mixture; and a heating step of heat-treating the spherical mixture and producing a substantially spherical composite active material for lithium secondary batteries.
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