| abstract |
Disclosed are a negative electrode active material for a secondary battery having cycle characteristics with improved charge / discharge capacity and capacity retention, and a method for producing the same. Si, O, and H obtained by heat-treating a hydrogen silsesquioxane polymer obtained by hydrolyzing the Si compound represented by the formula (1) and then performing a condensation reaction in an inert gas atmosphere. and, in the infrared spectrum, the intensity of peak 1 from Si-H in 820~920cm -1 (I 1) and the Si-O-Si peak intensity 2 from in 1000 to 1200 -1 (I 2) The silicon oxide represented by the general formula SiOxHy (1 <x <1.8, 0.01 <y <0.4), wherein the ratio (I 1 / I 2 ) is in the range of 0.01 to 0.35 A negative electrode active material for a lithium ion secondary battery, and a method for producing the same. HSi (R) 3 (1) (In the formula, R is a group selected from hydrogen, alkoxy having 1 to 10 carbon atoms, etc.) |