Method for manufacturing negative electrode active material for non-aqueous electrolyte secondary battery
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United States of America Patent
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Jan 3, 2017
Grant Date -
Aug 6, 2015
app pub date -
Apr 15, 2015
filing date -
May 24, 2010
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Abstract
The present invention is a method for manufacturing a negative electrode active material for a non-aqueous electrolyte secondary battery. The method includes depositing silicon on a substrate by vapor deposition by using a metallic silicon as a raw material, the substrate having a temperature controlled to 300° C. to 800° C. under reduced pressure; and pulverizing and classifying the deposited silicon. The resulting negative electrode active material composed of silicon particles is an active material useful as a negative electrode of a non-aqueous electrolyte secondary battery in which high initial efficiency and high battery capacity of silicon are kept, cycle performance is superior, and an amount of a change in volume decreases at the time of charge and discharge.
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